WO2003021191A1 - Navigation system for mobile communication devices - Google Patents
Navigation system for mobile communication devices Download PDFInfo
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- WO2003021191A1 WO2003021191A1 PCT/US2002/028190 US0228190W WO03021191A1 WO 2003021191 A1 WO2003021191 A1 WO 2003021191A1 US 0228190 W US0228190 W US 0228190W WO 03021191 A1 WO03021191 A1 WO 03021191A1
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- WIPO (PCT)
- Prior art keywords
- mobile communications
- communications device
- destination
- navigation
- user
- Prior art date
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Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/09—Arrangements for giving variable traffic instructions
- G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
- G08G1/0968—Systems involving transmission of navigation instructions to the vehicle
- G08G1/096855—Systems involving transmission of navigation instructions to the vehicle where the output is provided in a suitable form to the driver
- G08G1/096861—Systems involving transmission of navigation instructions to the vehicle where the output is provided in a suitable form to the driver where the immediate route instructions are output to the driver, e.g. arrow signs for next turn
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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
- G01C21/20—Instruments for performing navigational calculations
-
- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/005—Traffic control systems for road vehicles including pedestrian guidance indicator
-
- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/09—Arrangements for giving variable traffic instructions
- G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
- G08G1/0968—Systems involving transmission of navigation instructions to the vehicle
- G08G1/096855—Systems involving transmission of navigation instructions to the vehicle where the output is provided in a suitable form to the driver
- G08G1/096866—Systems involving transmission of navigation instructions to the vehicle where the output is provided in a suitable form to the driver where the complete route is shown to the driver
-
- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/09—Arrangements for giving variable traffic instructions
- G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
- G08G1/0968—Systems involving transmission of navigation instructions to the vehicle
- G08G1/096877—Systems involving transmission of navigation instructions to the vehicle where the input to the navigation device is provided by a suitable I/O arrangement
- G08G1/096883—Systems involving transmission of navigation instructions to the vehicle where the input to the navigation device is provided by a suitable I/O arrangement where input information is obtained using a mobile device, e.g. a mobile phone, a PDA
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
- H04M1/724—User interfaces specially adapted for cordless or mobile telephones
- H04M1/72403—User interfaces specially adapted for cordless or mobile telephones with means for local support of applications that increase the functionality
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M2250/00—Details of telephonic subscriber devices
- H04M2250/10—Details of telephonic subscriber devices including a GPS signal receiver
Definitions
- This invention relates to the field of electronic navigation systems and mobile communications devices and, in particular, to navigation systems within mobile communication devices.
- radio Magnetic Indicator displays the bearing from an aircraft or other vehicle to each of two selected radio beacons.
- GPS Global Positioning Satellite
- Portable GPS devices are particularly helpful and therefore popular with people for whom navigation is very important. Such people include pilots, boat operators, and hikers for example. Some models of cars are currently being equipped with GPS navigation systems. However, the popularity of GPS devices is currently limited to people with special navigation needs or as part of a larger product such as a car in which the expense of a GPS device is dwarfed by, and can be included in, the expense of the larger product.
- GPS devices require sophisticated, special-purpose circuitry to track numerous satellites and to cooperate with those numerous satellites to determine a relative position of a particular GPS device.
- Such special-purpose circuitry represents a generally affordable, yet significant cost.
- a mobile communications device such as a cellular telephone receives navigation data indicating a relative position of the mobile communications device to an intended destination to provide navigation assistance to the user of the mobile communications device.
- the mobile communications device requests such navigation data from a fixed base station in communication with the mobile communications device.
- the base station determines the approximate geographical location of the mobile communications device in a conventional manner without reliance on external position awareness on the part of the mobile device.
- a bearing and range to the intended destination from the measured location of the mobile communications device is determined.
- the navigation data received by the mobile communications device can include the determined bearing and range.
- the navigation data can also include such things as latitude and longitude of the mobile communications device, map data, and progressive navigation instructions for example.
- the mobile communications device includes a compass for enabling directional instructions to the user.
- the compass of the mobile communications device is used, in conjunction with the bearing to the intended destination, to determine a relative bearing to the intended destination.
- the relative bearing, thus determined can be displayed as an arrow in the general direction of the intended destination relative to a directional orientation of the mobile communications device.
- the sampling of the compass of the mobile communications device can be performed sufficiently frequently to provide real-time and interactive navigation assistance to the user. For example, when the compass is sampled multiple times per second, the user can turn in either direction while holding the mobile communications device and the indicated relative bearing to the intended destination updates sufficiently frequently to provide useful guidance to the user while turning.
- the user is provided with a convenient and intuitive interface for determining the direction to the intended destination relative to the user's surroundings.
- the relative bearing is determined relative to the orientation of the mobile communications device and not derived by rate of change of position as is done by GPS devices.
- a GPS device does not accurately reflect heading of the GPS device while rotating about a single fixed location, a mobile communications device using an included compass in accordance with the present invention does.
- the range to the destination from the measured location of the mobile communications device can also be displayed to the user.
- the range to the destination as displayed to the user is generally not affected by the compass of the mobile communications device.
- the location of the mobile communications device is determined.
- the location of the mobile communications device can be determined using, for example, the CursorTM remote unit location system of Cambridge Positioning Systems of Cambridge, England, or a similar technology from Cel- Lok of Calgary, Alberta, Canada.
- Such location technologies are commercial service offerings designed to support the Federal Communications Commission's (FCC's) mandate that the locations of mobile telephones placing emergency calls shall be determined and that information regarding the location of such a mobile telephone shall be available to the responding emergency service.
- FCC's Federal Communications Commission's
- the intended destination is compared to the location of the mobile communications device to determine the bearing and range from the mobile communications device to the intended destination.
- the bearing and range to the intended . destination is determined periodically.
- the frequency of such bearing and range periodic determinations can be less than the frequency of the relative bearing updates made by reference to the compass of the mobile communications device since the directional orientation of the mobile communications device typically changes more rapidly than does the location of the mobile communications device when held by a pedestrian user.
- the frequency at which the location of the mobile communications device, and thus the bearing and range to the intended destination, is updated depends at least partly on the accuracy with which the location of the mobile communications device can be determined and the rate at which that location is likely to change.
- frequency of location updates can depend on the level of service desired by the user. In particular, by allowing modification of the period at which updates are made, the quality or grade of service offered can be adjusted to meet the willingness of the user to pay for different grades of service. During periods of heavy demand, decreasing the frequency of updates frees processing and communications bandwidth to serve a larger number of users of such a navigation service.
- Figure 1 is a diagram showing a mobile communications device and base station which cooperate to provide navigation guidance to a user of the mobile communications device in accordance with the present invention.
- FIG. 2 is a block diagram showing elements of the mobile communications device and base station of Figure 1 in greater detail.
- FIG. 3 is a logic flow diagram showing the navigation process of the mobile communications device in accordance with the present invention.
- Figure 4 is a logic flow diagram showing the navigation process of the base station in accordance with the present invention.
- Figure 5 is a display view showing an illustrative navigation display in accordance with the present invention.
- Figure 6 illustrates determination of bearing and range from the mobile communications device to the destination using Cartesian coordinates.
- Figure 7 illustrates determination of bearing and range from the mobile communications device to the destination using radial coordinates.
- Figures 8 and 9 are display views of respective alternative embodiments.
- the location of a mobile communications device 102 ( Figure 1), which can be a cellular telephone for example, is determined by one or more base stations 106 and information about the determined location is communicated to mobile communications device 102 for representation to the user.
- the location is represented in this illustrative embodiment as a relative bearing and range to a destination.
- the destination can be a fixed location which is specified by an address or other location specification such as latitude/longitude coordinates or a mobile target such as other mobile communications devices.
- Figure 1 shows mobile communications device 102 which is in commumcation with a base station 106 through a fixed-location antenna 104.
- mobile communications device 102 is a cellular telephone.
- mobile communications device 102 can be any of a number of other types of mobile communications devices including, without limitation, a two-way pager, a personal digital assistant (PDA) with communications capability, or a mobile modem such as the RicochetTM mobile modem available from Metricom, Inc. of San Jose, California - including or excluding an attached personal computer.
- PDA personal digital assistant
- Mobile communications device 102 and base station 106 are shown in greater detail in Figure 2.
- Mobile communications device 102 includes communication logic 202 which cooperates with communication logic 212 of base station 106 to carry out voice communications in a conventional manner.
- communication logic 202 and communication logic 212 cooperate to carry out mobile telephone communications in a manner which is conventional for cellular telephones and base stations.
- Such mobile telephone communications includes, for example, (i) channel changing or frequency hopping for spread-spectrum protocols, (ii) hand-offs to other base stations as mobile communications device 102 moves from the region of one base station to the region of another, (iii) control of transmit power of mobile communications device 102, (iv) full- duplex voice communication or common variants, and (iv) digital data communication according to any of a number of data communication protocols.
- data communication protocols include, for example, circuit-switched data services for Global System for Mobile Communications (GSM) networks, circuit-switched data service for CDMA networks, and Cellular Digital Packet Data (CDPD).
- GSM Global System for Mobile Communications
- CDPD Cellular Digital Packet Data
- Mobile communications device 102 also includes user interface and input/output (I/O) logic 208.
- Mobile communications device 102 include a keypad 110 ( Figure 1), a display 112, and a speaker and microphone for normal voice communication. While a typical telephone-style keypad 110 is shown, it should be appreciated that generally any type of user input device can be used.
- such user input devices include, without limitation, keypads with button layouts other than that shown in Figure 1, touch- sensitive screens with either virtual keypads or hand- writing recognition, speech recognition circuitry and logic, and graphical user interface input devices.
- User interface and I/O logic 208 generates signals in response to physical manipulation of keypad 110 ( Figure 1) by the user and displays textual and/or graphical information to the user in display 112 and can also present auditory information through a speaker or headset jack to the user as well.
- User interface and I/O logic 208 ( Figure 2) and communication logic 202 combine to provide communications through mobile communications device 102 in a conventional manner.
- Mobile communications device 102 further includes navigation logic 204 which assists the user in navigating from a current, unknown location to a desired destination.
- the user initiates navigation processing by navigation logic 204 by pressing, for example, a dedicated button of keypad 110 ( Figure 1) or by traversing a user-interface menu using conventional user-interface techniques. Processing by navigation logic 204 in response is illustrated in logic flow diagram 300 ( Figure 3).
- step 302 navigation logic 204 initiates a navigation mode in response to the user's issued navigation command.
- navigation logic 204 receives data from the user specifying a destination to which the user would like to travel.
- the user can enter the destination in any of a number of ways.
- the user can enter numerical values representing latitudinal and longitudinal coordinates of the destination or generally any alphanumeric sequence identifying a destination or waypoint using keypad 110.
- the user can enter a street address using keypad 110 using a multi-tap technique for entering letters or using a predictive technique such as the predictive text entering technique known as the eZiTextTM text entry system by Zi Corporation of Calgary, Alberta, Canada. Descriptions and demonstrations of the eZiTextTM text entry system can be found at Zi Corporation's web site (r ⁇ ttp://www.zicorp.com .
- a number of characters are mapped to each key of a limited keypad and key presses are disambiguated using predictive analysis.
- the typical telephone keypad associates the "2" key with the letters, "a,” “b,” and “c.”
- a single press of the "2" key can be interpreted as an "a,” a “b,” or a “c.”
- Pressing the "2" key twice can be the beginning of any of a number of words. For example, “cat,” “bat,” and “act” all begin with the "2-2" sequence. All such words are sorted according to predicted usage frequency and the user can select a predicted word at any time, thus reducing significantly the number of key presses required to specify various words.
- entered text is not limited to the Latin/Roman alphabet. Ideographic languages, such as Chinese, can also be recognized as described in U.S. Patent 5,109,352 to Robert O'Dell which is incorporated herein by reference.
- mobile communications device 102 has access to the World Wide Web and includes a browser (e.g., if mobile communications device 102 is a WAP-enabled cellular phone or a PDA with World Wide Web browsing capability), the destination address can be imported from a web-page viewed by the user.
- the user can cause selected addresses to be stored in a "favorites" list from which the user can select such a previously entered address in step 304.
- the destination is a mobile target such as another mobile communications device, the destination can be specified by a code number such as a telephone number of the mobile target.
- Navigation server logic 216 can, for example, assist in predictive interpretation of keypad buttons pressed by the user.
- navigation server logic 216 corresponds to a fixed base station 106 and therefore can limit street names to those of streets within a predetermined range of base station 106.
- navigation server logic 216 can provide a list of cities within a predetermined range of base station 106 such that the user can select a city from this list such that using a rather limited (in some embodiments) keypad 110 to enter an alphanumeric city name is obviated.
- navigation server logic 216 can retrieve a list of predetermined locations and associated data corresponding to the selected destination region.
- processing by navigation logic 204 transfers to loop step 306 which, in conjunction with next step 322, defines a loop in which steps 308- 320 are repeated until the user terminates the navigation function using conventional user- interface techniques such as pressing or pressing and holding a dedicated button in keypad 110 for example.
- navigation logic 204 polls the location of mobile communications device 102.
- navigation logic 204 requests that remote unit location logic 214 determines the location of mobile communications device 102.
- polling location in step 308 includes sending data identifying the destination entered by the user.
- navigation logic 204 and navigation server logic 216 cooperate to interpret user-generated signals representing the destination intended by the user in step 304. Accordingly, navigation server logic 216 knows the destination intended by the user, and no such destination data is included in the location poll of step 308 in this alternative embodiment.
- navigation server logic 216 acts as shown in logic flow diagram 400 ( Figure 4).
- navigation server logic 216 ( Figure 2) initiates determination of a geographical location of mobile communications device 102 through remote unit location logic 214.
- remote unit location logic 214 is the CursorTM remote unit location system of Cambridge Positioning Systems of Cambridge, England. The CursorTM remote unit location system is known and is not described herein. Briefly, remote unit location logic 214 uses base station 106 and other fixed stations of known position which are in communication with base station 106 to determine an approximate physical location of mobile communications device 102.
- navigation server logic 216 calculates a magnetic bearing, i.e., a direction relative to magnetic North, and a range, i.e., distance to the destination.
- a magnetic bearing i.e., a direction relative to magnetic North
- a range i.e., distance to the destination.
- the mathematics involved in calculating bearing and distance from the location of mobile communications device 102 to the destination is straightforward and generally includes nothing more complex than simple trigonometry. While such mathematics are generally known, they are described briefly below for completeness.
- navigation server logic 216 sends the magnetic bearing and range to mobile communications device 102.
- navigation logic 204 receives the magnetic bearing and range to the destination from base station 106.
- navigation logic 204 receives only location information pertaining to the location of mobile communications device 102 ( Figure 1) and calculates the magnetic bearing and range to the destination from the location of mobile communications device 102.
- This alternative embodiment requires additional processing resources within mobile communications device 102 to perform such calculations and requires determining of a location of the destination. In particular, if the destination is specified as a street address, mobile communications device 102 determines coordinates for the destination from the street address in this alternative embodiment.
- mobile communications device 102 can include sufficient data and logic to determine coordinates of the destination from an address or other location information known by the user. If the destination is mobile, e.g., another mobile communications device, remote unit location logic 214 determines the location of the mobile destination in generally the same manner that remote unit location logic 214 determines the location of mobile communications device 102 in step 402 ( Figure 4)and communicates the location of the mobile destination to navigation server logic 216 ( Figure 2).
- navigation logic 204 has a magnetic bearing and a range to the destination by completion of step 310 ( Figure 3) whether such bearing and range are determined by navigation logic 204 or navigation server logic 216.
- Loop step 312 and next step 320 define a loop in which steps 314-318 are performed for a predetermined period of time.
- the predetermined period of time is selected generally according to a number of factors which collectively determine how frequently the location of mobile communications device 102 ( Figure 1) should be updated. Such factors can include, for example, the accuracy of determination of the location of mobile communications determined by remote unit location logic 214 ( Figure 2), the precision with which range information is to be displayed to the user as described below, and the speed with which the user and mobile communications device could be moving.
- the predetermined period of time is fifteen (15) seconds. In fifteen (15) seconds, a user of mobile communications device 102 can walk about seventy-five (75) feet which close approximates the accuracy of currently used locations technology in a typical multi-path radio environment at 1 GHz.
- the predetermined period of time is approximated by performing a predetermined number of iterations of the loop of steps 312-320 ( Figure 3).
- the predetermined period of time can be adjusted according to any of a number of factors including, for example, a level of service requested by the user, the speed with which the user (and thus mobile communications device 102) is moving, and the availability of processing and/or communications bandwidth of base station 106. The speed with which mobile communications device 102 is moving can be determined by compared determined locations of mobile communications device 102 at various times and calculating the rates at which the location of mobile communications device 102 changes.
- navigation logic 204 retrieves data representing a compass heading from a electronic compass 206 included within mobile communications device 102.
- electronic compass 206 is the Vector 2X compass module available from Precision Navigation, Inc. of Santa Rosa, California.
- electronic compass 206 can be any type of compass which can be integrated with mobile communications device 102. Examples include magnetoresistive compasses such as those described in Application Note AN00022 by Philips Semiconductor of Eindhoven, the Netherlands entitled "Electronic Compass Design Using KMZ51 and KMZ52" and compasses using the Hall effect for orientation determination.
- step 316 ( Figure 3), navigation logic 204 ( Figure 2) calculates a relative bearing using the magnetic bearing received in step 310 ( Figure 3) and the compass heading received in step 314.
- the relative bearing is the difference between the magnetic bearing and the compass heading.
- the relative bearing is the magnetic bearing less the compass heading and adjusted by an integer multiple of 360 degrees such that the relative bearing is between 0 and 359 degrees.
- navigation logic 204 ( Figure 2) displays the relative bearing and range to the destination in display 112 as shown in Figure 5.
- navigation logic 204 displays a pointer 502 (Figure 5) in display 112.
- Pointer 502 is shown in the direction of the relative bearing to the destination calculated in step 314 ( Figure 3).
- pointer 502 ( Figure 5) points directly to the physical location of the destination entered by the user and therefore assists the user in traveling to the destination.
- Other useful navigation information is included in display 112 in step 318 ( Figure 3).
- the range to the destination is displayed as text 504 ( Figure 5).
- the relative bearing is represented numerically in text 506.
- the magnetic bearing is represented numerically in text 508.
- the compass heading of mobile communications device 102 is represented numerically in text 510 and graphically by compass rose 514.
- the destination entered by the user is represented by text 512.
- a moving map can be displayed in display 112.
- progressive navigation instructions (such as "turn left at the intersection ahead of you — Kearny Ave.") can be displayed to the user in display 112.
- the current position of mobile communications device 102 can be represented in latitude and longitude.
- step 318 processing transfers through next step 320 to loop step 312 in which steps 314-318 are repeated until the predetermined period of time has expired.
- a new compass heading is retrieved in step 314, a new relative bearing is calculated in step 316, and the new relative bearing is displayed in step 318.
- the display shown in Figure 5 is continually updated in real time as the user turns toward pointer 502 to move toward the destination.
- the real-time reaction of pointer 502 to movement by the user assists the user tremendously in becoming oriented toward the destination.
- the range will not change, nor will the magnetic bearing, until an updated location of mobile communications device 102 ( Figure 1) is polled.
- mobile communications device 102 ( Figure 1) can provide navigation assistance similar to that provided by GPS systems at nominal additional cost.
- mobile communications device 102 is described above to include compass 206 ( Figure 2) and to use compass 206 to provide directional navigation assistance as described in conjunction with steps 312-320 ( Figure 3), significant navigation assistance can be provided without compass 206 ( Figure 2).
- steps 312-320 are replaced with a single display navigation step in which navigation data received from navigation server logic 216 (Figure 2) is displayed to the user on display 112 ( Figure 1).
- Such navigation data can be as simple as a general direction such as North by Northwest (or "NNW") displayed on display 112.
- Simple directional guidance as this can be very helpful to a user who (i) has a magnetic compass, (ii) has general directional awareness, or (iii) can deduce direction from her environment. For example, a user can identify North by noticing a direction of an increasing trend in numerical street addresses along a "North" street such as North First Street. Adding a range to the destination to display 112 improves navigational assistance provided by mobile communications device 102.
- Navigation assistance provided by mobile communications device 102 without compass 206 can be even more sophisticated. For example, a vector from a previous position determined by remote unit location logic 214 to a current position can be used to estimate a directional orientation of mobile communications device 102. Other displays can provide quite helpful navigation data to the user without reliance upon directional orientation of mobile communications device 102 as shown in Figures 8 and 9.
- Figure 8 shows a display in which an icon 802 representing the current position of mobile communications device 102 as determined by remote unit location logic 214 ( Figure 2) superimposed over a map of the surrounding area.
- the display also includes an icon 804 ( Figure 8) representing the intended destination as specified by the user in the map of the display.
- icon 804 Figure 8 representing the intended destination as specified by the user in the map of the display.
- the position of icon 802 in the map of the display is updated. By noting changes in the position of icon 802 in relation to the position of icon 804, the user can very effectively navigate to the destination.
- Figure 9 shows a display in which an icon 902 represents the current position of mobile communications device 102 as determined by remote unit location logic 214 ( Figure 2).
- An icon 904 represents the intended destination.
- Path 906 is simple and yet is effective in representing to the user progress toward the destination and a relative direction (i.e., right or left) to which the user should continue in order to reach the destination.
- mobile communications device 102 and base station 106 cooperate to provide exception navigational guidance to a user at nominal additional cost.
- the location of mobile communications device 102 as determined by remote unit location logic 214 is expressed in radial coordinates.
- the location of mobile communications device 102 is expressed as ( ⁇ m , p m ) where ⁇ m is the radial on which mobile communications device 102 is located relative to base station 106 expressed in degrees from magnetic north and p m is the distance of mobile communications device 102 from base station 106.
- the location of destination is expressed herein as ( ⁇ d , p d ) where ⁇ d is the radial on which the destination is located relative to base station 106 expressed in degrees from magnetic north and p d is the distance of the destination from base station 106.
- the desired information is expressed herein as ( ⁇ , p) where ⁇ is the magnetic bearing from mobile communications device 102 to the destination expressed in degrees from magnetic North and p is the distance from mobile communications device 102 to the destination. While degrees are described herein as the units in which angles are expressed, it is appreciated and any unit of angular measurement can also be used. Measuring angles in degrees from magnetic North makes calculation of relative bearing for display to the user particularly straightforward.
- radial coordinates of mobile communications device 102 and the destination are converted to two-dimensional linear coordinates, namely, (x m , y m ) for the location of mobile communications device 102 and
- the magnetic bearing and range can be determined using other coordinate systems such as a radial coordinate system as shown in Figure 7.
- Distances A and B are determined according to the following equations:
- the angle a is determined according to the following equation:
- the above equations use angles which are relative to magnetic North from base station 106. If base station 106 determines such angles relative to true North or some other reference angle, the angles are converted to magnetic headings using the magnetic deviation for the fixed location of base station 106.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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EP02773285A EP1423660A1 (en) | 2001-09-04 | 2002-09-04 | Navigation system for mobile communication devices |
Applications Claiming Priority (2)
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US09/947,202 | 2001-09-04 | ||
US09/947,202 US20030054830A1 (en) | 2001-09-04 | 2001-09-04 | Navigation system for mobile communication devices |
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WO2003021191A1 true WO2003021191A1 (en) | 2003-03-13 |
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PCT/US2002/028190 WO2003021191A1 (en) | 2001-09-04 | 2002-09-04 | Navigation system for mobile communication devices |
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US (1) | US20030054830A1 (en) |
EP (1) | EP1423660A1 (en) |
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Also Published As
Publication number | Publication date |
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CN1639543A (en) | 2005-07-13 |
US20030054830A1 (en) | 2003-03-20 |
EP1423660A1 (en) | 2004-06-02 |
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