WO1994014082A1 - An installation for the transfer of position information - Google Patents
An installation for the transfer of position information Download PDFInfo
- Publication number
- WO1994014082A1 WO1994014082A1 PCT/SE1993/001110 SE9301110W WO9414082A1 WO 1994014082 A1 WO1994014082 A1 WO 1994014082A1 SE 9301110 W SE9301110 W SE 9301110W WO 9414082 A1 WO9414082 A1 WO 9414082A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- information
- geographical position
- station
- correct
- movable
- Prior art date
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Classifications
-
- 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
- G01S5/0009—Transmission of position information to remote stations
Definitions
- the present invention relates to automatic transfer, between cooperating units, of information relating to the geographic positions or localizations of the units.
- a proposal to improve the position indication by means of satellite signals is that a geographically fixed station is located at a place having a well determined position, that this station receives the signals from the satellites and by means thereof calculates a position.
- This calculated position is compared, in the station fixedly located at the earth surface, to the correct geographical coordinates, a difference value or error value is calculated as the difference of the calculated position and the correct position and this deviation or error is transmitted to other, for instance movable stations. They will then also receive the satellite signals and therefrom calculate their supposed positions. Thereafter the earlier error value, received from the station fixed at the earth surface, is subtracted from the calculated position value.
- a good accuracy can be obtained of the determination of the position of the stations, with an accuracy of the same magnitude of order which would have been possible by means of satellite signals which were not deliberately disturbed.
- the information being transferred between the station having a geographically known and well determined position and the stations of the movable units and between these latter stations can be tapped or eavesdropped by principally any receiver, tuned to the suitable frequency, and hereby this receiver can itself use the error information to determine the position thereof and also obtain information of the geographic positions of the movable units.
- the information transmitted between a fixed station and the stations arranged on the movable units and/or between the stations of the movable units may at least partly be in coded form.
- position signals are used which are issued from satellites, these signals normally being associated with a systematic error.
- the units receive the signals by means of stations arranged on the units and the stations calculate, from the position signals, the geographical position of the corresponding unit. The same is performed by a particular station, the correct geographical position of which is known and for instance is fixedly arranged.
- This station calculates the difference of the geographical position calculated from the satellite signals and the correct geographical position thereof and transmits information of the calculated difference to the stations of the movable units.
- the stations of the movable units calculate, by means of the received difference value, the correct geographical positions of the movable units and transfer information thereof to the station of at least one movable unit.
- the information transferred between the various stations can be encoded and hereby advantageously some portable information means is used, such as a memory card or an intelligent card provided with a processor.
- the portable information means contains information necessary for the encryption and decryption, such as keys and algorithms.
- - storage means such as a field in an electronic memory, for storing information on the correct geographical position of the station
- - receiver means with an antenna and suitable receiving circuits for receiving position signals from satellites, and, if necessary, conversion of the signals to a suitable digital form
- - second calculation means for determining the difference of the geographical position determined in this way and the correct geographical position of the station
- - transmission means comprising an antenna and suitable conversion and transmitting circuits for transmitting information of the calculated difference to the movable units.
- - receiver means such as above with an antenna and suitable receiving and conversion circuits for receiving position signals from satellites and information on the calculated difference from the station having a known geographical position,
- - transmission means with an antenna and suitable conversion and transmitting circuits for transferring information on the correct geographical position of the unit to at least one movable unit.
- the receiver means may also receive information on the geographical positions of other movable units and this movable unit comprises means such as display means, monitor, printer, etc. for collecting and/or displaying the geographical positions of the movable units.
- the calculation means can exist for instance in the shape of suitable electronic circuits or in the shape of an electronic processor associated with a control program therefor.
- Fig. 1 schematically shows an installation for the transfer of position indications
- Fig. 2 shows a block diagram of a station having a known geographical position
- Fig. 3 shows a block diagram of a station arranged on a movable unit.
- satellites 1 are schematically illustrated which transmit position information by means of radio communication.
- This position information is received both by one, for instance geographically fixed, station 3, which is provided with an antenna 7 and the geographical position of which is well determined and known at each instant.
- the position information from the satellites 1 is also received by stations 5 comprising antennas 25 which are arranged on movable units 6 such as motorized land vehicles, ships or air craft.
- the position information received by the station 3 having a known position is used by the station 3 for a calculation, only from the received signals, of the geographical position of the station 3.
- This calculated position is compared to the accurately known real position and an error or deviation is calculated.
- This difference or error is transferred, by means of radio communication, to the stations 5 of the movable units.
- These calculate in the same way their positions by means of the position information received from the satellite 1, then use the deviation value received from the station 3 having a known position, in order to calculate the corrected value of their own geographical positions and transmit, by means of radio communication, this corrected and generally rather correct value of their geographical localization to other stations 5 which are arranged on other movable units 6 cooperating with the unit 6 on which the transmitting station 5 is arranged.
- the stations 3 and 5 respectively can be provided with encryption means which appear in more detail in the figures 2 and 3 which illustrate block diagrams of an embodiment of the electronic construction of the station 3 having a known position and of the stations 5 arranged on movable units 6.
- the station 3 having a known position comprises an antenna 7 to which signal receiving means 9 are connected, for the reception of signals from satellites 1 and for conversion of the signals to a suitable data format.
- Received signals in suitable format are transferred to a control and calculation unit 11 which is arranged to receive satellite position signals and by means of only the numerical values, which are provided by these signals, calculate a value of the geographical position of the station 3.
- This calculated position is compared to the known geographical position of the station 3 which is stored in a field 13 in a data memory 15.
- the deviation of the calculated and the known value is calculated and by means of encryption circuits 17 the deviation value can be converted when it is necessary or for instance is decided by a control program of the control and calculation unit 11, to enciphered data information.
- the value of the position deviation can then be transmitted on the antenna 7 by means of signal transmission circuits 19.
- the encryption circuits 17 can comprise or totally or partly be substituted by a loose, insertable and portable memory or processor card 21 which is inserted in a card interface 23 connected to the encryption circuits 17.
- the memory or processor card 21 may comprise encryption keys, encryption algorithms etc.
- FIG. 3 of a station 5 arranged on a movable unit 6 agrees in its essential parts with the block diagram of Fig. 2 of a station 3 having a known geographical position with the exception that here there is no field in a memory for storing a known geographical position and that a suitable output means 41 such as a display is provided to display, in particular, positions of the other movable units.
- a block 303 decoding the signal received from a station 3 having a known geographical position and hereby information on the difference of the geographical position determined from the satellite signal and the real geographical position.
- the decoding is performed by means of the decoding circuits 31.
- the received signal is decoded to be displayed on the display unit or printed on the printer (block 41).
- the station 3 having a known geographical position determines, by means of a control program and the card 21 inserted in the card interface 23, which is supposed to be a processor card ("Smartcard”) , which encoding keys and/or encoding algorithms to be used, and transmits information thereon to the stations 5 of the movable units 6.
- Smartcard a processor card
- Different encoding can hereby be used for the communication between the station 3 having a known position and the stations 5 of various movable units and for communication between stations 5 of different movable units.
- Some acknowledgment procedure involving transmission of suitable information from the various receiving stations 5 can be used to indicate that the encoding information is received and will be used from now on by the stations 5 of the movable units.
- the station 3 having a known geographical position then calculates the position deviation and transmits a signal indicating the value thereof in encoded form to the stations 5 of the movable units 6, whereby thus different encoding can be used for information to different stations 5.
- the stations 5 of the movable units receive the signal by means of their antennas 25 and signal processing means 27 for receiving and the information produced hereby is coded in decoder circuits 31, comprising a card reader 33 and processor cards 35, by means of the information received earlier from the station 3 having a known position in relation to the encoding used.
- This information can be stored in the memory 37 of the control and calculation unit 29 or on the processor card 35.
- the deviation value is obtained (303) and then can then be stored in the memory 37 and be used by the control and calculation unit 29.
- the stations 5 of the movable units continuously also receive at their antenna position information from satellites 1 and calculate (301) guided only thereby their estimated value which is then corrected by the deviation value (in the block 305).
- the corrected position value are then encoded in the block 307 by means of the encoding circuits 31 and the processor card 35.
- the position value is then issued from the antenna 25 of the station in encoded form in the shape of a radio signal which is produced by the transmission signal conversion unit 39 of the station 5.
- the stations 5 of the movable units also continuously receive, at their antennas 25, signals from other stations 5, convert these signals to a suitable data format in the input signal conversion circuits 27 and decode, in the block 309, the obtained data by means of the decoding circuits 31 and the processor card 35.
- a suitable data format in the input signal conversion circuits 27 and decode, in the block 309 the obtained data by means of the decoding circuits 31 and the processor card 35.
- some output means 41 such as a display or a printer.
- the position information together with the position value of the considered station can be transferred to a control computer or another central control device for, for instance directly, influencing the displacement of the unit 6 on which the considered station 5 is arranged.
Abstract
In an automatized and accurate monitoring of the geographical positions of a number of movable units (6) position signals are used, which are transmitted from satellites (1). The units (6) receive the signals by means of stations (5) having antennas (7) arranged on the units (6) and the stations (5) calculate from the position signals the geographical position of the respective unit (6). The same is performed by a station (3), the correct geographic position of which is known and for instance is fixedly arranged. Further, this station (3) calculates the difference of the calculated geographical position and its correct geographical position and transmits information on the calculated difference to the stations (5) of the movable units (6). The stations (5) on the movable units (6) calculate by means of the received difference the correct geographical position of the movable units and transfer information thereof to the station (5) of at least one movable unit (6). In this unit the geographical positions of all the movable units (6) is collected and monitored. The information which is transferred between the different stations (3, 5) can be in coded form and thereby advantageously an intelligent memory card is used (35, 21).
Description
AN INSTALLATION FOR THE TRANSFER OF POSITION INFORMATION
TECHNICAL FIELD
The present invention relates to automatic transfer, between cooperating units, of information relating to the geographic positions or localizations of the units.
BACKGROUND OF THE INVENTION
In monitoring movable units such as movable war vehicles and war vessels and in particular for commanding them in performing common operations, information is required on the positions of the vehicles or vessels. These positions are since long provided from observations of the surroundings of the movable units, by then finding the corresponding position on a map and thereafter determining and transfer the map coordinates to a central commanding unit. In the rapid displacements of today it is, however, a slow, poorly suitable procedure. There is thus a need of rapid, automatic, reliable and secure position determining systems.
For automatic position determination there are satellites which are placed at a high elevation over the surface of the earth and which emit radio signals, by means of which the receiver rather accurately can determine its geographic position. For such a determination it may be required that signals are received from several such satellites. However, these signals are deliberately provided with a disturbing signal whereby determination of the position of a receiver will be associated with an error of the magnitude of order of several tens of metres, while a position indication, if the signals had not been provided with the disturbing signal, having a largest error of a few metres would have been obtained.
A proposal to improve the position indication by means of satellite signals is that a geographically fixed station is located at a place having a well determined position, that this station receives the signals from the satellites and by means thereof calculates a position. This calculated position is compared, in the station fixedly located at the earth surface, to the correct geographical coordinates, a difference value or error value is calculated as the difference of the calculated position and the correct position and this deviation or error is transmitted to other, for instance movable stations. They will
then also receive the satellite signals and therefrom calculate their supposed positions. Thereafter the earlier error value, received from the station fixed at the earth surface, is subtracted from the calculated position value. Hereby, again a good accuracy can be obtained of the determination of the position of the stations, with an accuracy of the same magnitude of order which would have been possible by means of satellite signals which were not deliberately disturbed.
In such a position determination it may be a disadvantage that the information being transferred between the station having a geographically known and well determined position and the stations of the movable units and between these latter stations, can be tapped or eavesdropped by principally any receiver, tuned to the suitable frequency, and hereby this receiver can itself use the error information to determine the position thereof and also obtain information of the geographic positions of the movable units.
DESCRIPTION OF THE INVENTION
It is a purpose of the invention to provide a procedure, an installation and devices incorporated therein, by means of which one or several central stations can obtain information on and monitor the geographical position of one or more stations arranged on movable units.
It is another purpose of the invention to provide an installation wherein position information can be transferred in a secure way such that unauthorized persons cannot gain access thereto.
The needs and the disadvantage in prior procedures as mentioned above are eliminated by and the mentioned purposes are achieved by the invention, the more detailed features and characteristics of which appear from the appended claims.
Thus the procedure described above for position determination by means of satellite signals can be used for command and monitoring where position indications are transferred between several stations arranged on various cooperating fixed and movable units.
Further the information transmitted between a fixed station and the stations arranged on the movable units and/or between the stations of the movable units may at least partly be in coded
form.
In the monitoring of the geographical position of a number of movable units thus position signals are used which are issued from satellites, these signals normally being associated with a systematic error. The units receive the signals by means of stations arranged on the units and the stations calculate, from the position signals, the geographical position of the corresponding unit. The same is performed by a particular station, the correct geographical position of which is known and for instance is fixedly arranged. This station calculates the difference of the geographical position calculated from the satellite signals and the correct geographical position thereof and transmits information of the calculated difference to the stations of the movable units. The stations of the movable units calculate, by means of the received difference value, the correct geographical positions of the movable units and transfer information thereof to the station of at least one movable unit. In this unit the geographical positions are collected and monitored for all the movable units. The information transferred between the various stations can be encoded and hereby advantageously some portable information means is used, such as a memory card or an intelligent card provided with a processor. The portable information means contains information necessary for the encryption and decryption, such as keys and algorithms.
In an installation for monitoring the geographical positions of a number of movable units thus generally there is a station the correct geographical position of which is known. In this station there are:
- storage means, such as a field in an electronic memory, for storing information on the correct geographical position of the station,
- receiver means with an antenna and suitable receiving circuits for receiving position signals from satellites, and, if necessary, conversion of the signals to a suitable digital form,
- first calculation means for calculation of the geographical position of the station from the position signals,
- second calculation means for determining the difference of the geographical position determined in this way and the correct geographical position of the station, and
- transmission means comprising an antenna and suitable conversion and transmitting circuits for transmitting information of the calculated difference to the movable units.
In each movable unit there are
- receiver means, such as above with an antenna and suitable receiving and conversion circuits for receiving position signals from satellites and information on the calculated difference from the station having a known geographical position,
- first calculation means for determining the geographical position of the unit from the position signals,
- second calculation means for calculating the correct geographical position thereof by means of the received calculated difference, and
- transmission means with an antenna and suitable conversion and transmitting circuits for transferring information on the correct geographical position of the unit to at least one movable unit.
In at least one movable unit the receiver means may also receive information on the geographical positions of other movable units and this movable unit comprises means such as display means, monitor, printer, etc. for collecting and/or displaying the geographical positions of the movable units.
The calculation means can exist for instance in the shape of suitable electronic circuits or in the shape of an electronic processor associated with a control program therefor.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in more detail in the form of a non limiting embodiment and with reference to the accompanying drawings in which
Fig. 1 schematically shows an installation for the transfer of position indications,
Fig. 2 shows a block diagram of a station having a known geographical position, and
Fig. 3 shows a block diagram of a station arranged on a movable unit.
DESCRIPTION OF THE PREFERRED EMBODIMENT
In Fig. 1 satellites 1 are schematically illustrated which transmit position information by means of radio communication. This position information is received both by one, for instance
geographically fixed, station 3, which is provided with an antenna 7 and the geographical position of which is well determined and known at each instant. The position information from the satellites 1 is also received by stations 5 comprising antennas 25 which are arranged on movable units 6 such as motorized land vehicles, ships or air craft.
The position information received by the station 3 having a known position is used by the station 3 for a calculation, only from the received signals, of the geographical position of the station 3. This calculated position is compared to the accurately known real position and an error or deviation is calculated. This difference or error is transferred, by means of radio communication, to the stations 5 of the movable units. These calculate in the same way their positions by means of the position information received from the satellite 1, then use the deviation value received from the station 3 having a known position, in order to calculate the corrected value of their own geographical positions and transmit, by means of radio communication, this corrected and generally rather correct value of their geographical localization to other stations 5 which are arranged on other movable units 6 cooperating with the unit 6 on which the transmitting station 5 is arranged.
In the transmission of the deviation value from the station 3 having a fixed position to the stations 5 of the movable units and/or of the positions of the stations 5 of the movable units to stations 5 of other movable units the transferred information is encoded in order that other receiver stations than the intended ones will not be able to use the transferred information. Therefore the stations 3 and 5 respectively can be provided with encryption means which appear in more detail in the figures 2 and 3 which illustrate block diagrams of an embodiment of the electronic construction of the station 3 having a known position and of the stations 5 arranged on movable units 6.
As is apparent in Fig. 2, thus the station 3 having a known position comprises an antenna 7 to which signal receiving means 9 are connected, for the reception of signals from satellites 1 and for conversion of the signals to a suitable data format. Received signals in suitable format are transferred to a control and calculation unit 11 which is arranged to receive satellite
position signals and by means of only the numerical values, which are provided by these signals, calculate a value of the geographical position of the station 3. This calculated position is compared to the known geographical position of the station 3 which is stored in a field 13 in a data memory 15. The deviation of the calculated and the known value is calculated and by means of encryption circuits 17 the deviation value can be converted when it is necessary or for instance is decided by a control program of the control and calculation unit 11, to enciphered data information. The value of the position deviation can then be transmitted on the antenna 7 by means of signal transmission circuits 19.
The encryption circuits 17 can comprise or totally or partly be substituted by a loose, insertable and portable memory or processor card 21 which is inserted in a card interface 23 connected to the encryption circuits 17. The memory or processor card 21 may comprise encryption keys, encryption algorithms etc.
The essential steps being performed by the control and calculation unit 11 thus are, as is also schematically illustrated in Fig. 2:
1. A calculation, in a block 201, of the geographical position from the signal received from a satellite 1.
2. In a block 203 accessing the accurate position of the station 3 in the memory field 13 of the memory 15.
3. A calculation, in a block 205, of the difference of the calculated geographical position and the correct geographical position.
4. An encryption, in a block 207, of the difference value by means of the encryption circuits 23.
The block diagram illustrated in Fig. 3 of a station 5 arranged on a movable unit 6 agrees in its essential parts with the block diagram of Fig. 2 of a station 3 having a known geographical position with the exception that here there is no field in a memory for storing a known geographical position and that a suitable output means 41 such as a display is provided to display, in particular, positions of the other movable units.
The essential steps which are here performed by the control and calculation unit 29 for determining the correct geographical position of the station then is, as is also indicated in Fig. 3:
1. A calculation, in a block 301, of the geographical position from the signal received from a satellite 1.
2. In a block 303 decoding the signal received from a station 3 having a known geographical position and hereby information on the difference of the geographical position determined from the satellite signal and the real geographical position. The decoding is performed by means of the decoding circuits 31.
3. Calculation, in a block 305, of the correct geographical position of the station.
4. Encoding, in a block 307, of the coordinates of the real position of the station for conversion and transmission in a block 39.
In the reception of a signal from another station 5 arranged on a movable unit 6 only this step is performed:
1. In a block 309 the received signal is decoded to be displayed on the display unit or printed on the printer (block 41).
An example of signalling suitable for position indications transferred between the stations 5 of the movable units 6 will now be described.
In a start of the installation the station 3 having a known geographical position determines, by means of a control program and the card 21 inserted in the card interface 23, which is supposed to be a processor card ("Smartcard") , which encoding keys and/or encoding algorithms to be used, and transmits information thereon to the stations 5 of the movable units 6. Different encoding can hereby be used for the communication between the station 3 having a known position and the stations 5 of various movable units and for communication between stations 5 of different movable units. Some acknowledgment procedure involving transmission of suitable information from the various receiving stations 5 can be used to indicate that the encoding information is received and will be used from now on by the stations 5 of the movable units.
The station 3 having a known geographical position then calculates the position deviation and transmits a signal indicating the value thereof in encoded form to the stations 5 of the movable units 6, whereby thus different encoding can be used for information to different stations 5. The stations 5 of the
movable units receive the signal by means of their antennas 25 and signal processing means 27 for receiving and the information produced hereby is coded in decoder circuits 31, comprising a card reader 33 and processor cards 35, by means of the information received earlier from the station 3 having a known position in relation to the encoding used. This information can be stored in the memory 37 of the control and calculation unit 29 or on the processor card 35. The deviation value is obtained (303) and then can then be stored in the memory 37 and be used by the control and calculation unit 29.
The stations 5 of the movable units continuously also receive at their antenna position information from satellites 1 and calculate (301) guided only thereby their estimated value which is then corrected by the deviation value (in the block 305). The corrected position value are then encoded in the block 307 by means of the encoding circuits 31 and the processor card 35. The position value is then issued from the antenna 25 of the station in encoded form in the shape of a radio signal which is produced by the transmission signal conversion unit 39 of the station 5.
The stations 5 of the movable units also continuously receive, at their antennas 25, signals from other stations 5, convert these signals to a suitable data format in the input signal conversion circuits 27 and decode, in the block 309, the obtained data by means of the decoding circuits 31 and the processor card 35. After decryption thus an accurate position is obtained of a different station 5 and this position value together with information of the identity of the other station 5 is displayed on or transferred to some output means 41, such as a display or a printer. Alternatively the position information together with the position value of the considered station can be transferred to a control computer or another central control device for, for instance directly, influencing the displacement of the unit 6 on which the considered station 5 is arranged.
Claims
1. A procedure for monitoring the geographical position of a number of movable units, characterized in that position signals from satellites are received by each movable unit and that this unit therefrom calculates its geographical position, that the same position signals are received by a station the correct geographical position of which is known, that this station from the received signals calculate its geographical position and that the station calculates the difference of the geographical position determined in that way and its correct geographical position, that the station, the correct geographical position of which is known, transmits information on the calculated difference to the movable units, that the movable units by means of the received difference calculate their correct geographical positions and that the movable units transfer information of their correct geographical positions to at least one movable unit in which the geographical positions are collected and monitored.
2. A procedure according to claim 1, characterized in that in transmission of information on the calculated difference this information is first encoded.
3. A procedure according to one of claims 1 - 2, characterized in that in the transfer of information of correct positions from a movable unit this information is first encoded.
4. An installation for monitoring the geographical position of a number of movable units, characterized in a station, the correct geographical position of which is known, comprising
- storage means for storing information on the correct geographical position of the station,
- receiver means for receiving position signals from satellites,
- first calculation means for calculating, from the position signals, the geographical position of the station,
- second calculation means for calculating the difference of the. geographical position determined in that way and the correct geographical position thereof, and - transmission means for transmitting information on the calculated difference to the movable units,
- that each movable unit comprises
- receiver means for receiving position signals from satellites and of information on the calculated difference from the station having a known geographical position,
- first calculation means for calculating, from the position signals, the geographical position of the unit,
- second calculation units for calculating, by means of the received calculated difference, the correct geographical position thereof, and
- transmission means for transferring information on the correct geographical position of the unit to at least one movable unit, and that in at least one movable unit the receiver means are arranged
- to also receive information of the geographical positions of other movable units, and that this movable unit comprises
- means for collecting and/or displaying the geographical positions of the movable units.
5. An installation according to claim 4, characterized in that the station having a correct known geographical position also comprises
- encoding circuits for encoding, before the transmission of information of the calculated difference, this information and that the movable units comprise
- decoding circuits for, in the reception of information on the calculated difference, decoding this information.
6. An installation according to one of claims 4 - 5, characterized in that the movable units comprise
- encoding circuits for, before the transmission of information of their correct geographical positions, encode this information and
- that the at least one movable unit in which the receiver means are arranged to also receive information of the geographical positions of other movable units, also comprises
- decoding circuits for, in the reception of information of the correct geographical position of another movable unit, decoding this information.
7. An installation according to one of claims 5 or 6, characterized in that the encoding and/or decoding circuits respectively comprise a portable information means comprising information necessary to the encoding and the decoding.
8. An installation according to claim 7, characterized in that the portable information means is a memory card.
9. An installation according to claim 7, characterized in that the portable information means is a card comprising an own electronic processor and own memory means.
10. A movable unit for use in an installation for monitoring the geographical position of a number of movable units, the installation comprising a station, the correct geographical position of which is known, characterized in receiver means for reception of position signals from satellites and information on calculated difference from the station having a known geographical position, first calculation means for calculating, from the position signals, the geographical position of the unit, second calculating means for calculating, by means of the received calculated difference, the correct geographical position thereof, and transmission means for transferring information on the correct geographical position of the unit to at least one movable unit.
11. A movable unit according to claim 10, characterized in decoding circuits for decoding, in receiving information on the calculated difference, this information.
12. A movable unit according to one of claims 10 - 11, characterized in that the movable units comprise
- encoding circuits for, before transmission of information on their correct geographical positions, encoding this information.
13. A movable unit according to one of claims 10 - 12, characterized in
- that the receiver means are arranged to also receive information on the geographical positions of other movable units, and that it also comprises - means for collecting and/or displaying the geographical positions of the movable units.
14. A movable unit according to claim 13, characterized in
- decoding circuits for decoding, in receiving information of the correct geographical position of another movable unit, this information.
15. A movable unit according to one of claims 11, 12 or 14, characterized in that the encoding and/or decoding circuits respectively comprise a portable information means comprising information necessary to the encoding and decoding.
16. A movable unit according to claim 15, characterized in that the portable information means is a memory card.
17. A movable unit according to claim 15, characterized in that the portable information means is a card comprising a known electronic processor and own memory means.
18. A station, the correct geographical position of which is known, for use in an installation for monitoring the geographical position of a number of movable units, characterized in storage means for storing information on the correct geographical position of a station, receiver means for receiving position signals from satellites, first calculation means for calculating, from the position signals, the geographical position of the station, second calculation means for calculating the difference of the geographical position determined in that way and the correct geographical position of the station, transmission means for transmitting information on the calculated difference to the movable units, and encoding circuits for encoding, before the transmission of information on the calculated difference, this information.
19. A station according to claim 18, characterized in that the encoding circuits comprise a portable information means comprising information necessary to the encoding.
20. A station according to claim 19, characterized in that the portable information means is a memory card.
.
21. A station according to claim 19, characterized in that the portable information means is a card comprising an bwn electronic processor and own memory means.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE9203809A SE9203809D0 (en) | 1992-12-16 | 1992-12-16 | APPLICATION FOR TRANSFER OF POSITION INFORMATION |
| SE9203809-0 | 1992-12-16 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO1994014082A1 true WO1994014082A1 (en) | 1994-06-23 |
| WO1994014082A9 WO1994014082A9 (en) | 1995-02-16 |
Family
ID=20388160
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/SE1993/001110 WO1994014082A1 (en) | 1992-12-16 | 1993-12-16 | An installation for the transfer of position information |
Country Status (2)
| Country | Link |
|---|---|
| SE (1) | SE9203809D0 (en) |
| WO (1) | WO1994014082A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996021163A1 (en) * | 1994-12-20 | 1996-07-11 | Geco A.S. | A method for integrity monitoring in position determination |
| DE19505527A1 (en) * | 1995-02-18 | 1996-08-22 | Diehl Gmbh & Co | Target and position clarifying by on board sensor carrier (5) |
| US6211816B1 (en) | 1995-02-18 | 2001-04-03 | Diehl Stiftung & Co. | Process and apparatus for target or position reconnaissance |
| US7076365B2 (en) * | 2003-05-12 | 2006-07-11 | Circumnav Networks, Inc. | Enhanced dead reckoning method |
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| US4835537A (en) * | 1986-07-16 | 1989-05-30 | Manion James H | Telemetry burst collision avoidance system |
| US4860352A (en) * | 1985-05-20 | 1989-08-22 | Satellite Financial Systems Corporation | Satellite communication system and method with message authentication suitable for use in financial institutions |
| US4894655A (en) * | 1987-02-27 | 1990-01-16 | Lmt Radioprofessionnelle | Landing assistance system using navigation satellites |
-
1992
- 1992-12-16 SE SE9203809A patent/SE9203809D0/en unknown
-
1993
- 1993-12-16 WO PCT/SE1993/001110 patent/WO1994014082A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4860352A (en) * | 1985-05-20 | 1989-08-22 | Satellite Financial Systems Corporation | Satellite communication system and method with message authentication suitable for use in financial institutions |
| US4751512A (en) * | 1986-01-21 | 1988-06-14 | Oceanonics, Inc. | Differential navigation system for remote mobile users |
| US4835537A (en) * | 1986-07-16 | 1989-05-30 | Manion James H | Telemetry burst collision avoidance system |
| US4894655A (en) * | 1987-02-27 | 1990-01-16 | Lmt Radioprofessionnelle | Landing assistance system using navigation satellites |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996021163A1 (en) * | 1994-12-20 | 1996-07-11 | Geco A.S. | A method for integrity monitoring in position determination |
| GB2310556A (en) * | 1994-12-20 | 1997-08-27 | Geco As | A method for integrity monitoring in position determination |
| GB2310556B (en) * | 1994-12-20 | 1999-02-10 | Geco As | A method for integrity monitoring in position determination |
| DE19505527A1 (en) * | 1995-02-18 | 1996-08-22 | Diehl Gmbh & Co | Target and position clarifying by on board sensor carrier (5) |
| FR2730816A1 (en) * | 1995-02-18 | 1996-08-23 | Diehl Gmbh & Co | METHOD AND DEVICE FOR TARGET OR POSITION RECOGNITION |
| US6211816B1 (en) | 1995-02-18 | 2001-04-03 | Diehl Stiftung & Co. | Process and apparatus for target or position reconnaissance |
| DE19505527B4 (en) * | 1995-02-18 | 2004-02-05 | Diehl Stiftung & Co. | Procedures to clarify goals or situation |
| US7076365B2 (en) * | 2003-05-12 | 2006-07-11 | Circumnav Networks, Inc. | Enhanced dead reckoning method |
Also Published As
| Publication number | Publication date |
|---|---|
| SE9203809D0 (en) | 1992-12-16 |
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