US20030114115A1 - Positioning - Google Patents
Positioning Download PDFInfo
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- US20030114115A1 US20030114115A1 US10/182,615 US18261502A US2003114115A1 US 20030114115 A1 US20030114115 A1 US 20030114115A1 US 18261502 A US18261502 A US 18261502A US 2003114115 A1 US2003114115 A1 US 2003114115A1
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- Prior art keywords
- receiver
- probability density
- transmitter
- density function
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
- G01S5/0284—Relative positioning
- G01S5/0289—Relative positioning of multiple transceivers, e.g. in ad hoc networks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
- G01C21/10—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 by using measurements of speed or acceleration
- G01C21/12—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 by using measurements of speed or acceleration executed aboard the object being navigated; Dead reckoning
- G01C21/14—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 by using measurements of speed or acceleration executed aboard the object being navigated; Dead reckoning by recording the course traversed by the object
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/87—Combinations of radar systems, e.g. primary radar and secondary radar
- G01S13/876—Combination of several spaced transponders or reflectors of known location for determining the position of a receiver
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
- G01S5/0205—Details
- G01S5/0244—Accuracy or reliability of position solution or of measurements contributing thereto
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
Definitions
- the present invention relates to the positioning of a transceiver using other transceivers. It has particular application to the positioning of a transceiver by forming an ad hoc network of transceivers without the use of a dedicated infrastructure.
- GPS Global position system
- Cellular positioning systems have also been proposed in which the existing network of fixed base station transceivers is used to locate a mobile phone. The unchanging position and identity of the fixed base stations and the distance of the mobile phone from the base stations is used to estimate the phones location. Both of these systems operate over large distances exceeding many kilometres.
- FIG. 1 illustrates a distribution of transceivers T
- FIG. 2 illustrates an exemplary probability density function representing the chances of successful transmission between transmitter and receiver as the distance between transmitter and receiver varies
- FIG. 3 illustrates an exemplary probability density function representing the probable location of a transceiver on the x-axis
- FIG. 4 illustrates a transceiver
- FIG. 1 illustrates a transceiver Ti which is capable of forming an ad hoc network 2 via radio communications with the transceivers Tj.
- the network may be formed by Ti acting as a Master with the transceivers Tj functioning as Slaves.
- the transceivers are Bluetooth transceivers and the network is a piconet.
- the transceiver Ti acquires its position it forms a network with neighbouring transceivers Tj which have already acquired their positions.
- the communication range of transceiver Ti is illustrated by the circle 4 . There are a number of transceivers Tj which are outside the range 4 and cannot participate in the network 2 .
- the transceiver Ti once it has acquired its position it can participate as a Slave in a different network formed by another transceiver to acquire its position.
- Each of the transceivers T are the same. Each acts as a Master to form a network with Slave transceivers to acquire a position and then it can participate as a Slave in a different network formed by another transceiver to acquire its position.
- the transceivers T are not infrastructure. They are preferably integrated into host devices such as mobile phones, desk telephones, computers etc. The transceivers which are available to participate in a network may therefore vary as transceivers move into and out of range of the Master transceiver.
- prob TransSuccessful.ji [y] may be replaced by prob TransSuccessful [y] which represents the probability that any one of the transceivers Tj can transmit successfully to the transceiver Ti when separated by distance y.
- FIG. 2 illustrates an exemplary probability density function representing the chances of successful transmission between a transmitter and receiver Ti as the distance between transmitter and receiver varies.
- the probability density function may be based on measurements for example by sounding the communication channel between transmitter and receiver.
- the probability density function may be an approximation, chosen to ease subsequent calculations.
- the illustrated probability density function is an approximation which eases subsequent calculations. It assumes that within a certain range of the transmitter the chances of reception are good and constant, but at a certain threshold distance from the transmitter the chances of reception decrease proportionally with the distance travelled from the threshold.
- the transceivers T are preferably positioned in three dimensions with respect to three orthogonal linear axes. Although this is not essential, it provides advantages because the positioning of a transceiver with respect to one of the axes is independent of the positioning with respect to the other two axes. The transceiver is therefore positioned in three dimensions by positioning it separately with respect to each axes. In the following description the positioning of a transceiver Ti with respect to one axes is described. Analogous procedures are carried out for the remaining axes.
- Each transceiver is positioned with respect to the linear axis using a probability density function.
- the transceiver Tj is positioned with respect to the linear axis by pdf j [z] where the argument indicates a position of the transceiver Tj from an origin common to the transceivers Tj .
- the function pdf j [z] varies as the argument varies having a maximal value at where the most likely acquired position for transceiver Tj is.
- the transceiver Ti will acquire its position by calculating a probability density function pdf i [z] for itself.
- FIG. 3 illustrates an exemplary probability density function pdf i [z] representing the probable location of a transceiver on the x-axis, where z represents a distance along the x-axis.
- each of the transmitters j may be equal, there is no necessity for each of the transmitters j to send prob TransSuccessful.ji [y].
- the values of prob TransSuccessful [y] may be stored in Ti. However, if the transmitters Tj have different transmission characteristics such as different transmission power levels then it may be appropriate for each of the transceivers Tj to transmit prob TransSuccessful.ji [y] to the transceiver Ti.
- the transceiver Ti can calculate its position density function pdf i [z], which takes into account all the transceivers Tj, by combining the intermediate probability density functions pdf ij [y] calculated because the particular Transceiver Tj can communicate with Ti, for all j.
- pdf ij [y] ( ⁇ - ⁇ ⁇ ⁇ pdf j ⁇ [ ⁇ ] ⁇ prob TransSuccessful ⁇ ji ⁇ [ y - ⁇ ] ⁇ ⁇ ⁇ ) ⁇ - ⁇ ⁇ ⁇ ( ⁇ - ⁇ ⁇ ⁇ pdf j ⁇ [ ⁇ ] ⁇ prob TransSuccessful ⁇ ji ⁇ [ y - ⁇ ] ⁇ ⁇ ) ⁇ ⁇ y
- the probability density function representing the position of the receiver Ti is therefore given by the convolution of the probability density function representing the position of the transmitter Tj with the probability density function representing the likelihood of successful transmission from the transmitter to receiver.
- the method can be coded as follows:
- pdf iTempj pdf iTempj - 1 ⁇ ⁇ y ⁇ ⁇ ⁇ j ⁇ pdf ij ⁇ ⁇ y ⁇ ⁇ y ′ ⁇ ( pdf iTempj - 1 ⁇ [ y ′ ] ⁇ pdf ij ⁇ [ y ′ ] )
- Information about the second order transceivers can be used to additionally refine pdf i [y] so that it takes account not only of where the transceiver Ti could be because it can directly communicate with transceivers Tj but also where it could not be because it cannot communicate with the second order transceivers.
- prob TransSuccessful.ki [y] should also be transmitted to Ti via the first order transceivers Tj. However, if all the second order transceivers are the same then prob TransSuccessful.ki [y] will be a constant and can be stored. According to a one embodiment, the approximate value prob TransSuccessful [y] which was used in the first order calculations is also used in the second order calculations.
- FIG. 4 illustrates a transceiver suitable for carrying out the invention. It comprises transmitter circuitry, receiver circuitry, a processor and a memory.
- the memory stores the above described algorithm.
- the processor executes the algorithm.
- the parameters used as input to the algorithm are stored in the memory and the result of the algorithm, the position of the transceiver, is also stored in the memory.
- the transceiver operates as a receiver, to acquire its position, it receives the parameters it requires for the algorithm from the transceivers it is in communication with and stores them in the memory.
- the transceiver operates as a transmitter, it is operable to transmit its stored position to the receiving transceiver using its transmission circuitry.
- the algorithm may be transported for transfer to a transceiver using a carrier such as a CD-ROM or floppy disc.
Abstract
A receiver for calculating its position according to a first transmitter, having a processor arranged to convolve: the probability density function representing the position of the first transmitter, sent by the first transmitter to the receiver; with the probability density function representing the likelihood that a transmission from the first transmitter will be successfully received at the receiver.
Description
- The present invention relates to the positioning of a transceiver using other transceivers. It has particular application to the positioning of a transceiver by forming an ad hoc network of transceivers without the use of a dedicated infrastructure.
- It is often desirable to be able to determine one's position or to determine the position of another person or device. The Global position system (GPS) allows the location of specialist receivers to be positioned on the surface of the earth. GPS uses a fixed network of satellite transmitters orbiting the earth to transmit to and thereby locate the receiver. Cellular positioning systems have also been proposed in which the existing network of fixed base station transceivers is used to locate a mobile phone. The unchanging position and identity of the fixed base stations and the distance of the mobile phone from the base stations is used to estimate the phones location. Both of these systems operate over large distances exceeding many kilometres.
- It would be desirable to provide a system by which the location of persons or objects can be determined wirelessly but without having to invest in a dedicated fixed network of radio receivers.
- It would be desirable to re-use existing wireless technology, which may be provided for a different purpose, to allow position determination.
- For a better understanding of the present invention and to understand how the same may be brought into effect reference will now be made by way of example only to the accompanying drawings in which:
- FIG. 1 illustrates a distribution of transceivers T;
- FIG. 2 illustrates an exemplary probability density function representing the chances of successful transmission between transmitter and receiver as the distance between transmitter and receiver varies;
- FIG. 3 illustrates an exemplary probability density function representing the probable location of a transceiver on the x-axis; and
- FIG. 4 illustrates a transceiver.
- FIG. 1 illustrates a transceiver Ti which is capable of forming an ad
hoc network 2 via radio communications with the transceivers Tj. The network may be formed by Ti acting as a Master with the transceivers Tj functioning as Slaves. Preferably the transceivers are Bluetooth transceivers and the network is a piconet. When the transceiver Ti acquires its position it forms a network with neighbouring transceivers Tj which have already acquired their positions. The communication range of transceiver Ti is illustrated by thecircle 4. There are a number of transceivers Tj which are outside therange 4 and cannot participate in thenetwork 2. - The transceiver Ti, once it has acquired its position it can participate as a Slave in a different network formed by another transceiver to acquire its position. Each of the transceivers T are the same. Each acts as a Master to form a network with Slave transceivers to acquire a position and then it can participate as a Slave in a different network formed by another transceiver to acquire its position. The transceivers T are not infrastructure. They are preferably integrated into host devices such as mobile phones, desk telephones, computers etc. The transceivers which are available to participate in a network may therefore vary as transceivers move into and out of range of the Master transceiver.
- Referring to FIG. 1, the transceiver Ti is attempting to determine its position. It forms a network with N transceivers Tj where j=1, 2, 3 . . . N.
- The probability that a transceiver Tj can transmit successfully to the transceiver Ti when separated by distance y is given by probTransSuccessful.ji[y]. The probability density function representing the probability a transceiver j can transmit successfully to the Transceiver Ti is given by pdfTransSuccessful.ji[y]
-
-
- FIG. 2 illustrates an exemplary probability density function representing the chances of successful transmission between a transmitter and receiver Ti as the distance between transmitter and receiver varies. The probability density function may be based on measurements for example by sounding the communication channel between transmitter and receiver. The probability density function may be an approximation, chosen to ease subsequent calculations. The illustrated probability density function is an approximation which eases subsequent calculations. It assumes that within a certain range of the transmitter the chances of reception are good and constant, but at a certain threshold distance from the transmitter the chances of reception decrease proportionally with the distance travelled from the threshold.
- The transceivers T are preferably positioned in three dimensions with respect to three orthogonal linear axes. Although this is not essential, it provides advantages because the positioning of a transceiver with respect to one of the axes is independent of the positioning with respect to the other two axes. The transceiver is therefore positioned in three dimensions by positioning it separately with respect to each axes. In the following description the positioning of a transceiver Ti with respect to one axes is described. Analogous procedures are carried out for the remaining axes.
- Each transceiver is positioned with respect to the linear axis using a probability density function. The transceiver Tj is positioned with respect to the linear axis by pdfj[z] where the argument indicates a position of the transceiver Tj from an origin common to the transceivers Tj . The function pdfj[z] varies as the argument varies having a maximal value at where the most likely acquired position for transceiver Tj is. The transceiver Ti will acquire its position by calculating a probability density function pdfi[z] for itself.
- FIG. 3 illustrates an exemplary probability density function pdfi[z] representing the probable location of a transceiver on the x-axis, where z represents a distance along the x-axis.
- When the transceiver Ti is acquiring its position, it receives pdfj[z] from each of the N transceiver Tj where j=1, 2, 3 . . . N. That is it receives pdf1[z] from T1, pdf2[z] from T2, pdf3[z] from T3, etc.
- If all transmitters Tj are equal, there is no necessity for each of the transmitters j to send probTransSuccessful.ji[y]. The values of probTransSuccessful[y] may be stored in Ti. However, if the transmitters Tj have different transmission characteristics such as different transmission power levels then it may be appropriate for each of the transceivers Tj to transmit probTransSuccessful.ji[y] to the transceiver Ti.
- On the basis of this information the transceiver Ti can calculate its position according to a first order calculation. This first order calculation takes into account, the transceivers Tj with which the transceiver Ti can directly communicate. The calculation determines where the transceiver Ti could be because it can communicate with the transceivers Tj.
- The transceiver Ti can calculate its position density function pdfi[z], which takes into account all the transceivers Tj, by combining the intermediate probability density functions pdfij[y] calculated because the particular Transceiver Tj can communicate with Ti, for all j.
-
-
- The probability density function representing the position of the receiver Ti is therefore given by the convolution of the probability density function representing the position of the transmitter Tj with the probability density function representing the likelihood of successful transmission from the transmitter to receiver.
-
- where αj is a parameter which represents how trustworthy the Transceiver Tj is. For example, if the transceiver Tj is a reference station it will have a high value, whereas if the transceiver Tj is very mobile it will have a low value. It should be appreciated that the values αj may be transmitted by transceiver Tj to transceiver Ti (although renormalisation will be required such that Σαj=1) , or the values of αj may be calculated by Ti on the basis of information received from the transceivers Tj such as other indications of their trustworthiness.
- The use of trustworthiness in the calculation can be disabled by setting αj=1 for all j.
- The above calculation of pdfi[z] effectively determines the renormalised overlap of the probability density functions pdfij[z] (taking into account their trustworthiness if appropriate) for all j. A problem, however, arises if the probability density functions pdfij[z] do not overlap.
- A preferred method of combining the intermediate probability density functions pdfij[y] takes into account that the intermediate probability density functions pdfij[y] may not all overlap. The method combines the intermediate probability density functions in a pair-wise fashion. If the pair of probability density functions which are to be combined do overlap the method calculates the renormalised overlap of the two intermediate probability density functions. However, if the pair of probability density functions which are to be combined do not overlap, the method calculates a weighted sum of the two probability density functions.
- One manner of implementing the preferred method will now be described. In this preferred method the transceiver Ti, before it has acquired its new position, may have no current position or may have a position which has expired. If the current position has expired the variable pdfi(old)[y] is set equal to the current expired value of pdfi[y]. If there is no current position the variable pdfi(old)[y] is set equal to 0. A temporary variable pdfiTemp.j[y] is assigned for use in the calculation. It is initially set for j=0, equal to pdfi(old)[y]. The temporary variable pdfiTemp.j−1[y], is combined in a pair-wise fashion with pdfi.j[y], starting with the pair-wise combination of variable pdfiTemp.0[y] with pdfi.1[y] to produce pdfiTemp.1[y], then the pair-wise combination of pdfiTemp.1[y] with pdfi.2[y] to produce pdfiTemp.2[y], etc., ending with the pair-wise combination of pdfiTemp.N−1[y] with pdfi.N[y] to produce pdfiTemp.2[y] which is the position of Ti (pdfi[y])) taking into account only the first order transceivers Tj, for j=1, 2, 3 . . . N.
- The method can be coded as follows:
- Start Code:
- Initial condition: pdfiTemp.0[y]=pdfi(old)[y]
- Body of the loop started with j=1 and exited at j=N
- {
-
-
- else
- (If there is no overlap, calculate a weighted sum)
- pdfiTempj[y]=pdfiTempj−1[y]+αjpdfij[y]
- }End of loop
- Final result: pdfi[y]=pdfiTemp.N[y]
- End Code
- Thus far the value of pdfi[y] representing the position of the transceiver Ti, takes into account only the transceivers Tj{j=1,2, . . . N}, which can communicate directly with the transceiver Ti. Each of the transceivers Tj may be able to directly communicate directly with transceivers with which the transceiver Ti is unable to directly communicate. Such transceivers are second order transceivers as the transceiver Ti which is acquiring its position cannot communicate to them directly but can receive information about them from the transceivers it can communicate with. Information about the second order transceivers can be used to additionally refine pdfi[y] so that it takes account not only of where the transceiver Ti could be because it can directly communicate with transceivers Tj but also where it could not be because it cannot communicate with the second order transceivers.
- Let each of the second order transceivers be designated by Tk, where k≠j and k≠i, k=1,2 . . . M.
- In the above coding, the loop is directly followed and the “Final result” is directly preceded by the coding:
-
- It will be necessary for the transceiver to receive the values of pdfk[y] via the first order transceivers which are in communication with the second order transceivers.
- Likewise probTransSuccessful.ki[y] should also be transmitted to Ti via the first order transceivers Tj. However, if all the second order transceivers are the same then probTransSuccessful.ki[y] will be a constant and can be stored. According to a one embodiment, the approximate value probTransSuccessful[y] which was used in the first order calculations is also used in the second order calculations.
- The probability density function representing a position of a transceiver will normally have a normal distribution as illustrated in FIG. 3. Advantages can be achieved by assuming such pdfs have a normal distribution. The completed information required to define a normal distribution is the mean and the standard deviation. Consequently the probability density function representing the position of a transceiver can be transmitted using only two parameters—the mean and standard deviation.
- FIG. 4 illustrates a transceiver suitable for carrying out the invention. It comprises transmitter circuitry, receiver circuitry, a processor and a memory. The memory stores the above described algorithm. The processor executes the algorithm. The parameters used as input to the algorithm are stored in the memory and the result of the algorithm, the position of the transceiver, is also stored in the memory. When the transceiver operates as a receiver, to acquire its position, it receives the parameters it requires for the algorithm from the transceivers it is in communication with and stores them in the memory. When the transceiver operates as a transmitter, it is operable to transmit its stored position to the receiving transceiver using its transmission circuitry. The algorithm may be transported for transfer to a transceiver using a carrier such as a CD-ROM or floppy disc.
- Although the present invention has been described in the preceding paragraphs with reference to various examples, it should be appreciated that modifications and variations to the examples given can be made without departing from the spirit and scope of the invention.
Claims (13)
1. A receiver for calculating its position according to a first transmitter, having a processor arranged to convolve:
(i) the probability density function representing the position of the first transmitter, sent by the first transmitter to the receiver; with
(ii) the probability density function representing the likelihood that a transmission from the first transmitter will be successfully received at the receiver.
2. A receiver as claimed in claim 1 for calculating its position according to a second transmitter, having a processor arranged to convolve:
(i) the probability density function representing the position of the second transmitter, sent by the second transmitter to the receiver; with
(ii) the probability density function representing the likelihood that a transmission from the second transmitter will be successfully received at the receiver.
3. A receiver as claimed in any preceding claim wherein the probability density function representing the likelihood that a transmission from the first transmitter will be successfully received at the receiver is an approximation which simplifies processing.
4. A receiver as claimed in claim 2 or 3, wherein the probability density function representing the likelihood that a transmission from the first transmitter will be successfully received at the receiver is the same as the probability density function representing the likelihood that a transmission from the second transmitter will be successfully received at the receiver.
5. A receiver as claimed in claim 1 for calculating its position according to a plurality of transmitters, having a processor arranged to calculate a probability density function for each of said plurality of transmitters by the convolution of
(i) the probability density function representing the position of one of the plurality of said transmitters, sent by said one transmitter to the receiver; with
(ii) the probability density function representing the likelihood that a transmission from said one transmitter will be successfully received at the receiver
and arranged to combine the resultant plurality of probability density functions.
6. A receiver as claimed in claim 5 wherein the combination of the resultant probability density functions involves pair-wise combination of probability density functions.
7. A receiver as claimed in claim 6 wherein the pair-wise combination involves the multiplication of one probability density function with another.
8. A receiver as claimed in claim 5 wherein the pair-wise combination involves the addition of one probability density function with another.
9. A receiver as claimed in claim 7 or 8, wherein the combination is a weighted combination.
10. A receiver as claimed in claim 9 wherein the weighted combination increases the contribution made from probability density functions derived from trusted transmitters.
11. A receiver as claimed in any preceding claim wherein the transmitters are not permanent infrastructure.
12. A method of calculating the position of a receiver by communication with a plurality of transceivers comprising the steps of, for each of said plurality of transmitters, convolving
(i) the probability density function representing the position of a transmitter, sent by the transmitter to the receiver; with
(ii) the probability density function representing the likelihood that a transmission from the transmitter will be successfully received at the receiver
and combining the plurality of convolution products.
13. A method as claimed in claim 12 wherein the receiver is the Master transceiver in an ad-hoc network of Bluetooth transceivers and the plurality of transmitters are Slave transceivers in that Bluetooth network.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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GB0002404A GB0002404D0 (en) | 2000-02-02 | 2000-02-02 | Position acquisition |
GB0002404.2 | 2000-02-02 | ||
GB0019366.4 | 2000-08-07 | ||
GB0019366A GB0019366D0 (en) | 2000-08-07 | 2000-08-07 | Positioning |
Publications (1)
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US20030114115A1 true US20030114115A1 (en) | 2003-06-19 |
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Family Applications (3)
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US10/182,615 Abandoned US20030114115A1 (en) | 2000-02-02 | 2001-02-02 | Positioning |
US10/182,826 Expired - Fee Related US7107065B2 (en) | 2000-02-02 | 2001-02-02 | Position acquisition |
US11/429,937 Expired - Fee Related US7272404B2 (en) | 2000-02-02 | 2006-05-09 | Position acquisition |
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Application Number | Title | Priority Date | Filing Date |
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US10/182,826 Expired - Fee Related US7107065B2 (en) | 2000-02-02 | 2001-02-02 | Position acquisition |
US11/429,937 Expired - Fee Related US7272404B2 (en) | 2000-02-02 | 2006-05-09 | Position acquisition |
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US (3) | US20030114115A1 (en) |
EP (3) | EP1496370A1 (en) |
JP (2) | JP2003521714A (en) |
CN (1) | CN1441910A (en) |
AT (2) | ATE293255T1 (en) |
AU (2) | AU2001228715A1 (en) |
DE (2) | DE60116267T2 (en) |
WO (2) | WO2001057547A1 (en) |
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JP3479885B2 (en) | 2000-11-07 | 2003-12-15 | 日本電気株式会社 | Positioning method using mobile terminal and mobile terminal having positioning function |
US8260896B2 (en) | 2007-02-02 | 2012-09-04 | Mwa Intelligence, Inc. | Monitoring business machines using a mesh network on field nodes |
EP1293800A1 (en) * | 2001-09-17 | 2003-03-19 | Alcatel | Method for determining the position of a station in a wireless network, and station adapted for carrying out said method |
KR100459915B1 (en) * | 2001-12-10 | 2004-12-03 | 김면식 | Method of establishing radio communication network and radio communication system |
US7167715B2 (en) * | 2002-05-17 | 2007-01-23 | Meshnetworks, Inc. | System and method for determining relative positioning in AD-HOC networks |
EP1529380A2 (en) * | 2002-08-15 | 2005-05-11 | International Business Machines Corporation | Transponder subsystem for supporting location awareness in wireless networks |
US6885337B2 (en) * | 2003-09-10 | 2005-04-26 | Sony Ericsson Mobile Communications Ab | Methods and apparatus for determining the position of a mobile terminal using localized source assistance information |
US7242947B2 (en) * | 2003-12-23 | 2007-07-10 | Motorola, Inc. | Method and apparatus for determining the location of a unit using neighbor lists |
DE102004017602B4 (en) | 2004-04-07 | 2022-03-17 | Volkswagen Ag | Method and arrangement for a communication network with direct vehicle-to-vehicle communication |
US7353034B2 (en) | 2005-04-04 | 2008-04-01 | X One, Inc. | Location sharing and tracking using mobile phones or other wireless devices |
GB0510713D0 (en) * | 2005-05-26 | 2005-06-29 | Ibm | A method or apparatus for sharing image data |
JP4568641B2 (en) * | 2005-05-27 | 2010-10-27 | 株式会社日立製作所 | Wireless communication system, node position calculation method, and node |
US7664463B2 (en) * | 2005-08-17 | 2010-02-16 | Mourad Ben Ayed | Portable loss prevention system |
JP4586687B2 (en) * | 2005-09-02 | 2010-11-24 | 日産自動車株式会社 | Driving assistance device |
US20070184852A1 (en) * | 2006-01-17 | 2007-08-09 | Johnson David W | Method and system for location of objects within a specified geographic area |
KR100790084B1 (en) * | 2006-08-08 | 2008-01-02 | 삼성전자주식회사 | Method and apparatus for measuring distance in bluetooth device |
US9532399B2 (en) * | 2006-11-30 | 2016-12-27 | Kyocera Corporation | Apparatus, system and method for managing wireless local area network service to a multi-mode portable communication device |
GB2480192A (en) | 2007-02-02 | 2011-11-09 | Ubiquisys Ltd | Determining the location of a base station |
US7778167B2 (en) * | 2007-03-02 | 2010-08-17 | Agere Systems Inc. | Simulating packet delay variation using step-target delay method |
US9066199B2 (en) | 2007-06-28 | 2015-06-23 | Apple Inc. | Location-aware mobile device |
US8204684B2 (en) | 2007-06-28 | 2012-06-19 | Apple Inc. | Adaptive mobile device navigation |
US8332402B2 (en) | 2007-06-28 | 2012-12-11 | Apple Inc. | Location based media items |
US8180379B2 (en) | 2007-06-28 | 2012-05-15 | Apple Inc. | Synchronizing mobile and vehicle devices |
US8774825B2 (en) | 2007-06-28 | 2014-07-08 | Apple Inc. | Integration of map services with user applications in a mobile device |
US8290513B2 (en) | 2007-06-28 | 2012-10-16 | Apple Inc. | Location-based services |
US8311526B2 (en) | 2007-06-28 | 2012-11-13 | Apple Inc. | Location-based categorical information services |
US8175802B2 (en) | 2007-06-28 | 2012-05-08 | Apple Inc. | Adaptive route guidance based on preferences |
US8108144B2 (en) | 2007-06-28 | 2012-01-31 | Apple Inc. | Location based tracking |
US8762056B2 (en) | 2007-06-28 | 2014-06-24 | Apple Inc. | Route reference |
US9109904B2 (en) | 2007-06-28 | 2015-08-18 | Apple Inc. | Integration of map services and user applications in a mobile device |
US8275352B2 (en) | 2007-06-28 | 2012-09-25 | Apple Inc. | Location-based emergency information |
US8385946B2 (en) | 2007-06-28 | 2013-02-26 | Apple Inc. | Disfavored route progressions or locations |
EP2206387B1 (en) * | 2007-10-29 | 2020-07-08 | Telefonaktiebolaget LM Ericsson (publ) | Handling location information for femto cells |
US8355862B2 (en) | 2008-01-06 | 2013-01-15 | Apple Inc. | Graphical user interface for presenting location information |
DE102008021614B4 (en) | 2008-01-14 | 2015-09-24 | Siemens Aktiengesellschaft | A method, apparatus, node and computer program for determining a position of a node in an ad hoc network |
US9250092B2 (en) | 2008-05-12 | 2016-02-02 | Apple Inc. | Map service with network-based query for search |
US8644843B2 (en) | 2008-05-16 | 2014-02-04 | Apple Inc. | Location determination |
US8369867B2 (en) | 2008-06-30 | 2013-02-05 | Apple Inc. | Location sharing |
US8519884B2 (en) * | 2008-07-29 | 2013-08-27 | Aruba Networks, Inc. | Distance estimation |
US8359643B2 (en) | 2008-09-18 | 2013-01-22 | Apple Inc. | Group formation using anonymous broadcast information |
US8812013B2 (en) | 2008-10-27 | 2014-08-19 | Microsoft Corporation | Peer and composite localization for mobile applications |
US8260320B2 (en) | 2008-11-13 | 2012-09-04 | Apple Inc. | Location specific content |
US8380222B2 (en) * | 2008-11-26 | 2013-02-19 | Andrew Llc | System and method for multiple range estimation location |
CN102388348A (en) * | 2008-12-01 | 2012-03-21 | 埃利亚胡·拉德 | Method and system for monitoring and locating items |
US8660530B2 (en) | 2009-05-01 | 2014-02-25 | Apple Inc. | Remotely receiving and communicating commands to a mobile device for execution by the mobile device |
US8666367B2 (en) | 2009-05-01 | 2014-03-04 | Apple Inc. | Remotely locating and commanding a mobile device |
US8670748B2 (en) | 2009-05-01 | 2014-03-11 | Apple Inc. | Remotely locating and commanding a mobile device |
US8509731B2 (en) * | 2009-11-06 | 2013-08-13 | Research In Motion Limited | Location determination for mobile devices in emergency situations |
US9274209B2 (en) * | 2009-12-21 | 2016-03-01 | Nokia Technologies Oy | Positioning |
US9535154B2 (en) * | 2011-09-12 | 2017-01-03 | Microsoft Technology Licensing, Llc | Cache-based location determination |
US9674661B2 (en) | 2011-10-21 | 2017-06-06 | Microsoft Technology Licensing, Llc | Device-to-device relative localization |
US9494432B2 (en) * | 2012-06-19 | 2016-11-15 | Qualcomm Incorporated | Collaborative navigation techniques for mobile devices |
CN103018715B (en) * | 2012-11-22 | 2015-06-03 | 无锡中星微电子有限公司 | Positioning method and device based on Bluetooth |
CN103024665B (en) * | 2012-11-22 | 2016-09-21 | 无锡中感微电子股份有限公司 | A kind of electronic tag and communication means based on electronic tag and radio positioner |
DE102013104727A1 (en) | 2013-05-07 | 2014-11-13 | Deutsche Telekom Ag | Method and apparatus for determining the position of a mobile communication device |
US9366748B2 (en) * | 2013-06-12 | 2016-06-14 | Qualcomm Incorporated | Position location system architecture: peer to peer measurement mode |
US9551581B2 (en) | 2013-12-31 | 2017-01-24 | Albright Holdings, Inc. | Turn-by-turn navigation system and method using feedforward location estimation |
CN103888967A (en) * | 2014-03-07 | 2014-06-25 | 宁波大学 | Ad-hoc network node credibility evaluation method based on bayesian network |
US10523498B2 (en) * | 2016-12-23 | 2019-12-31 | Sierra Nevada Corporation | Multi-broker messaging and telemedicine database replication |
US10263661B2 (en) | 2016-12-23 | 2019-04-16 | Sierra Nevada Corporation | Extended range communications for ultra-wideband network nodes |
Citations (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4782450A (en) * | 1985-08-27 | 1988-11-01 | Bennett Flax | Method and apparatus for passive airborne collision avoidance and navigation |
US4796191A (en) * | 1984-06-07 | 1989-01-03 | Etak, Inc. | Vehicle navigational system and method |
US5045860A (en) * | 1990-06-27 | 1991-09-03 | R & D Associates | Method and arrangement for probabilistic determination of a target location |
US5056106A (en) * | 1990-08-02 | 1991-10-08 | Wang James J | Golf course ranging and direction-finding system using spread-spectrum radiolocation techniques |
US5119341A (en) * | 1991-07-17 | 1992-06-02 | The United States Of America As Represented By The Secretary Of The Air Force | Method for extending GPS to underwater applications |
US5579285A (en) * | 1992-12-17 | 1996-11-26 | Hubert; Thomas | Method and device for the monitoring and remote control of unmanned, mobile underwater vehicles |
US5774826A (en) * | 1995-11-30 | 1998-06-30 | Trimble Navigation Limited | Optimization of survey coordinate transformations |
US5838472A (en) * | 1996-07-03 | 1998-11-17 | Spectrix Corporation | Method and apparatus for locating a transmitter of a diffuse infrared signal within an enclosed area |
US6012013A (en) * | 1995-03-31 | 2000-01-04 | Trimble Navigation Limited | Vehicle position reporting in user defined uni-dimensional coordinate system |
US6016118A (en) * | 1998-03-05 | 2000-01-18 | Trimble Navigation Limited | Real time integration of a geoid model into surveying activities |
US6127975A (en) * | 1994-11-03 | 2000-10-03 | Ksi, Incorporated | Single station communications localization system |
US6442495B1 (en) * | 1999-08-25 | 2002-08-27 | Southwest Research Institute | Average signal to noise ratio estimator |
Family Cites Families (34)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB232977A (en) | 1924-04-28 | 1925-12-10 | Fidel Xanxo Domenech | An improved mill for pulverising bars of gum |
US4549293A (en) * | 1983-12-29 | 1985-10-22 | The United States Of America As Represented By The Secretary Of The Army | Time division multiple access communications system |
US5119104A (en) * | 1990-05-04 | 1992-06-02 | Heller Alan C | Location system adapted for use in multipath environments |
US5216429A (en) * | 1991-04-17 | 1993-06-01 | Ricoh Company, Ltd. | Position measuring system using pseudo-noise signal transmission and reception |
US5293645A (en) * | 1991-10-04 | 1994-03-08 | Sharp Microelectronics Technology, Inc. | Apparatus and method for locating mobile and portable radio terminals in a radio network |
US5974236A (en) * | 1992-03-25 | 1999-10-26 | Aes Corporation | Dynamically reconfigurable communications network and method |
US5481532A (en) * | 1994-06-29 | 1996-01-02 | General Electric Company | Mobile telecommunications device and service |
US5589838A (en) * | 1994-09-06 | 1996-12-31 | The Regents Of The University Of California | Short range radio locator system |
US5732354A (en) * | 1995-06-07 | 1998-03-24 | At&T Wireless Services, Inc. | Method and apparatus for determining the location of a mobile telephone |
US5802467A (en) * | 1995-09-28 | 1998-09-01 | Innovative Intelcom Industries | Wireless and wired communications, command, control and sensing system for sound and/or data transmission and reception |
US5850592A (en) * | 1996-01-11 | 1998-12-15 | Gte Internetworking Incorporated | Method for self-organizing mobile wireless station network |
US6486794B1 (en) * | 1996-02-26 | 2002-11-26 | Motorola, Inc. | Method of locating a subscriber unit within the coverage area of a communication system |
US6108555A (en) | 1996-05-17 | 2000-08-22 | Ksi, Inc. | Enchanced time difference localization system |
US6021330A (en) * | 1997-07-22 | 2000-02-01 | Lucent Technologies Inc. | Mobile location estimation in a wireless system using designated time intervals of suspended communication |
US5912644A (en) * | 1997-08-05 | 1999-06-15 | Wang; James J. M. | Spread spectrum position determination, ranging and communication system |
GB9720256D0 (en) | 1997-09-24 | 1998-02-11 | Roke Manor Research | Detector system |
US5963624A (en) * | 1997-12-05 | 1999-10-05 | Zilog, Inc. | Digital cordless telephone with remote control feature |
US6256296B1 (en) * | 1997-12-17 | 2001-07-03 | Yaron Ruziak | Network communications link |
US6054950A (en) * | 1998-01-26 | 2000-04-25 | Multispectral Solutions, Inc. | Ultra wideband precision geolocation system |
US6901241B2 (en) * | 1998-02-11 | 2005-05-31 | Telefonaktiebolaget L M Ericsson (Publ) | System, method and apparatus for secure transmission of confidential information |
WO1999061933A2 (en) | 1998-04-16 | 1999-12-02 | Raytheon Company | Airborne gps guidance system for defeating multiple jammers |
FR2779233B1 (en) | 1998-05-26 | 2007-06-01 | Centre Nat Etd Spatiales | NAVIGATION SYSTEM |
GB2338374A (en) | 1998-06-10 | 1999-12-15 | Motorola Ltd | Locating a mobile telephone using time of arrival measurements |
US6304556B1 (en) * | 1998-08-24 | 2001-10-16 | Cornell Research Foundation, Inc. | Routing and mobility management protocols for ad-hoc networks |
US6115580A (en) * | 1998-09-08 | 2000-09-05 | Motorola, Inc. | Communications network having adaptive network link optimization using wireless terrain awareness and method for use therein |
DE19849294C2 (en) * | 1998-10-16 | 2001-09-27 | Daimler Chrysler Ag | Method of spreading a message |
US6184829B1 (en) * | 1999-01-08 | 2001-02-06 | Trueposition, Inc. | Calibration for wireless location system |
US6330429B1 (en) * | 1999-04-14 | 2001-12-11 | Lucent Technologies, Inc. | Channel grouping system and method for a wireless communications system |
US6980524B1 (en) * | 1999-05-20 | 2005-12-27 | Polytechnic University | Methods and apparatus for routing in a mobile ad hoc network |
US6453168B1 (en) * | 1999-08-02 | 2002-09-17 | Itt Manufacturing Enterprises, Inc | Method and apparatus for determining the position of a mobile communication device using low accuracy clocks |
US6751455B1 (en) * | 1999-09-17 | 2004-06-15 | The Regents Of The University Of California | Power- and bandwidth-adaptive in-home wireless communications system with power-grid-powered agents and battery-powered clients |
US6275707B1 (en) * | 1999-10-08 | 2001-08-14 | Motorola, Inc. | Method and apparatus for assigning location estimates from a first transceiver to a second transceiver |
US7006453B1 (en) * | 2000-03-14 | 2006-02-28 | Lucent Technologies Inc. | Location based routing for mobile ad-hoc networks |
WO2002003091A2 (en) * | 2000-07-03 | 2002-01-10 | Ecole Polytechnique Federale De Lausanne (Epfl) | Method and wireless terminal for generating and maintaining a relative positioning system |
-
2001
- 2001-02-02 JP JP2001556342A patent/JP2003521714A/en not_active Withdrawn
- 2001-02-02 EP EP04077500A patent/EP1496370A1/en not_active Withdrawn
- 2001-02-02 JP JP2001556341A patent/JP2003521856A/en not_active Withdrawn
- 2001-02-02 AU AU2001228715A patent/AU2001228715A1/en not_active Abandoned
- 2001-02-02 AT AT01949036T patent/ATE293255T1/en not_active IP Right Cessation
- 2001-02-02 DE DE60116267T patent/DE60116267T2/en not_active Expired - Lifetime
- 2001-02-02 AU AU2001228711A patent/AU2001228711A1/en not_active Abandoned
- 2001-02-02 US US10/182,615 patent/US20030114115A1/en not_active Abandoned
- 2001-02-02 WO PCT/GB2001/000434 patent/WO2001057547A1/en active IP Right Grant
- 2001-02-02 CN CN01807814.1A patent/CN1441910A/en active Pending
- 2001-02-02 WO PCT/GB2001/000440 patent/WO2001057548A1/en active IP Right Grant
- 2001-02-02 EP EP01949037A patent/EP1264193B1/en not_active Expired - Lifetime
- 2001-02-02 EP EP01949036A patent/EP1264192B1/en not_active Expired - Lifetime
- 2001-02-02 AT AT01949037T patent/ATE314663T1/en not_active IP Right Cessation
- 2001-02-02 US US10/182,826 patent/US7107065B2/en not_active Expired - Fee Related
- 2001-02-02 DE DE60110052T patent/DE60110052T2/en not_active Expired - Fee Related
-
2006
- 2006-05-09 US US11/429,937 patent/US7272404B2/en not_active Expired - Fee Related
Patent Citations (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4796191A (en) * | 1984-06-07 | 1989-01-03 | Etak, Inc. | Vehicle navigational system and method |
US4782450A (en) * | 1985-08-27 | 1988-11-01 | Bennett Flax | Method and apparatus for passive airborne collision avoidance and navigation |
US5045860A (en) * | 1990-06-27 | 1991-09-03 | R & D Associates | Method and arrangement for probabilistic determination of a target location |
US5056106A (en) * | 1990-08-02 | 1991-10-08 | Wang James J | Golf course ranging and direction-finding system using spread-spectrum radiolocation techniques |
US5119341A (en) * | 1991-07-17 | 1992-06-02 | The United States Of America As Represented By The Secretary Of The Air Force | Method for extending GPS to underwater applications |
US5579285A (en) * | 1992-12-17 | 1996-11-26 | Hubert; Thomas | Method and device for the monitoring and remote control of unmanned, mobile underwater vehicles |
US6127975A (en) * | 1994-11-03 | 2000-10-03 | Ksi, Incorporated | Single station communications localization system |
US6012013A (en) * | 1995-03-31 | 2000-01-04 | Trimble Navigation Limited | Vehicle position reporting in user defined uni-dimensional coordinate system |
US5774826A (en) * | 1995-11-30 | 1998-06-30 | Trimble Navigation Limited | Optimization of survey coordinate transformations |
US5838472A (en) * | 1996-07-03 | 1998-11-17 | Spectrix Corporation | Method and apparatus for locating a transmitter of a diffuse infrared signal within an enclosed area |
US6016118A (en) * | 1998-03-05 | 2000-01-18 | Trimble Navigation Limited | Real time integration of a geoid model into surveying activities |
US6442495B1 (en) * | 1999-08-25 | 2002-08-27 | Southwest Research Institute | Average signal to noise ratio estimator |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100958658B1 (en) | 2007-11-30 | 2010-05-20 | 한국전자통신연구원 | Method and Apparatus for estimating the density and relative locations of randomly deployed sensor nodes |
US20090248287A1 (en) * | 2008-02-15 | 2009-10-01 | Kutta Technologies, Inc. | Unmanned aerial system position reporting system and related methods |
US8437956B2 (en) * | 2008-02-15 | 2013-05-07 | Kutta Technologies, Inc. | Unmanned aerial system position reporting system and related methods |
US9129520B2 (en) | 2008-02-15 | 2015-09-08 | Kutta Technologies, Inc. | Unmanned aerial system position reporting system |
US9595198B2 (en) | 2008-02-15 | 2017-03-14 | Kutta Technologies, Inc. | Unmanned aerial system position reporting system |
US10026323B2 (en) | 2008-02-15 | 2018-07-17 | Kutta Technologies, Inc. | Unmanned aerial system position reporting system |
US11891172B2 (en) | 2018-06-21 | 2024-02-06 | Sierra Nevada Corporation | Devices and methods to attach a composite core to a surrounding structure |
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US7107065B2 (en) | 2006-09-12 |
EP1264193A1 (en) | 2002-12-11 |
JP2003521714A (en) | 2003-07-15 |
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JP2003521856A (en) | 2003-07-15 |
WO2001057547A1 (en) | 2001-08-09 |
EP1264193B1 (en) | 2005-12-28 |
CN1441910A (en) | 2003-09-10 |
EP1264192A1 (en) | 2002-12-11 |
AU2001228715A1 (en) | 2001-08-14 |
US20060270349A1 (en) | 2006-11-30 |
AU2001228711A1 (en) | 2001-08-14 |
EP1496370A1 (en) | 2005-01-12 |
WO2001057548A1 (en) | 2001-08-09 |
ATE314663T1 (en) | 2006-01-15 |
US20030129993A1 (en) | 2003-07-10 |
EP1264192B1 (en) | 2005-04-13 |
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