Autonomous calibration of a wireless-global positioning system
First Claim
1. A method of calibrating a position location system, comprising:
- receiving position signals, at a plurality of locations, by at least one wireless mobile communication device;
determining downlink information from signals received by at least one wireless mobile communication device, at each of the plurality of locations; and
associating location information, obtained from received position signals, with downlink information determined at each of the plurality of locations, to thereby calibrate the position location system.
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Accused Products
Abstract
A wireless-global positioning system determines the location of a wireless mobile communication device from reliable position measurements and wireless network downlink measurements. The wireless network downlink measurements obtained are then used in conjunction with a database for pattern matching or contour matching. The difficulty of building and maintaining that database is alleviated by using those network downlink measurements associated with the reliable position measurements to populate the database, such as GPS measurements or those obtained through enhanced based positioning technique (EOTD). The increased database accuracy subsequently improves the quality of position location measurements from the wireless network.
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Citations
85 Claims
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1. A method of calibrating a position location system, comprising:
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receiving position signals, at a plurality of locations, by at least one wireless mobile communication device;
determining downlink information from signals received by at least one wireless mobile communication device, at each of the plurality of locations; and
associating location information, obtained from received position signals, with downlink information determined at each of the plurality of locations, to thereby calibrate the position location system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
determining whether or not the received global positioning signals are reliable based upon signal characteristics of the received global positioning signals, wherein only reliable global positioning signals are associated in the database.
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6. The method of claim 3 further comprising:
determining whether or not the received position signals are reliable, wherein only reliable position signals are associated in the database.
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7. The method of claim 4 further comprising:
determining whether or not the received position signals are reliable, wherein only reliable position signals are associated in the database.
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8. The method of claim 5, wherein the signal characteristics include carrier to noise ratios and RMS measurement errors.
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9. The method of claim 1, wherein the determined downlink information includes signal strength information.
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10. The method of claim 1, wherein the determined downlink information includes mobile assisted hand-off (MAHO) information.
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11. The method of claim 1, wherein the determined downlink information includes timing information.
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12. The method of claim 1, wherein the determined downlink information includes timing advance (TA) information.
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13. The method of claim 1, wherein the location information includes latitude and longitude information.
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14. The method of claim 1, wherein the calibrated position location system is useable to determine a location of a wireless mobile communication device by correlating its received downlink information with stored downlink information, and by determining a location associated with the stored downlink information.
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15. The method of claim 14, wherein correlating includes contour matching.
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16. The method of claim 9, wherein the calibrated position location system is useable to determine a location of a wireless mobile communication device by correlating its received signal strength information with stored signal strength information, and by determining a location associated with the stored signal strength information.
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17. The method of claim 16, wherein correlating includes contour matching.
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18. The method of claim 10, wherein the calibrated position location system is useable to determine a location of a wireless mobile communication device by correlating its received timing information with stored timing information, and by determining a location associated with the stored timing information.
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19. The method of claim 18, wherein correlating includes contour matching.
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20. The method of claim 11, wherein the calibrated position location system is useable to determine a location of a wireless mobile communication device by correlating its received MAHO information with stored MAHO information, and by determining a location associated with the stored MAHO information.
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21. The method of claim 20, wherein correlating includes contour matching.
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22. The method of claim 12, wherein the calibrated position location system is useable to determine a location of a wireless mobile communication device by correlating its received TA information with stored TA information, and by determining a location associated with the stored TA information.
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23. The method of claim 22, wherein correlating includes contour matching.
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24. A system, comprising:
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a database, populated with location information of a plurality of locations, obtained from position signals received by at least one wireless mobile communication device, and associated downlink information, obtained from signals received by at least one wireless communication device at each of a plurality of locations; and
controller, adapted to correlate received downlink information of a wireless mobile communication device with downlink information of the database, and adapted to determine a location of the wireless mobile communication device based upon location information associated with the correlated downlink information of the database. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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42. A memory for use in a position location system, comprising:
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location information of a plurality of locations, obtained from position signals received by at least one wireless mobile communication device; and
associated downlink information, obtained from signals received by at least one wireless communication device at each of a plurality of locations. - View Dependent Claims (43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54)
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55. A method, comprising:
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determining whether or not a wireless mobile communication device has received reliable position signals;
correlating downlink information of the wireless mobile communication device with downlink information of a database upon determining that the wireless mobile communication device has not received reliable position signals, the database including location information of a plurality of locations obtained from position signals received by at least one wireless mobile communication device and associated downlink information obtained from signals received by at least one wireless communication device at each of a plurality of locations; and
determining a location of the wireless mobile communication device based upon location information associated with the correlated downlink information of the database, upon determining that the wireless mobile communication device has not received reliable position signals. - View Dependent Claims (56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70)
determining a location of the wireless mobile communication device based upon the received reliable position signals, upon determining that the wireless mobile communication device has received reliable position signals.
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60. The method of claim 56, further comprising:
determining a location of the wireless mobile communication device based upon the received reliable global positioning signals, upon determining that the wireless mobile communication device has received reliable global positioning signals.
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61. The method of claim 59, wherein the received position signals are signals derived from network originated signals.
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62. The method of claim 61, wherein the received position signals are derived from an enhanced observed time difference (EOTD) technique.
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63. The method of claim 55, wherein correlating includes contour matching.
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64. The method of claim 55, wherein the downlink information includes signal strength information.
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65. The method of claim 55, wherein the downlink information includes timing information.
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66. The method of claim 64, wherein only reliable position signals are associated in the database, reliability of the received position signals being determined based upon signal characteristics of received global positioning signals.
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67. The method of claim 66, wherein reliability of any global positioning signals received by the wireless mobile communication device is determined based upon signal characteristics of the received global positioning signals.
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68. The method of claim 66, wherein the signal characteristics include carrier to noise ratios and RMS measurement errors.
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69. The method of claim 67, wherein the signal characteristics include carrier to noise ratios and RMS measurement errors.
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70. The method of claim 55, wherein the location information includes latitude and longitude information.
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71. A method of determining location of a wireless mobile communication device, comprising:
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correlating received downlink information of a wireless mobile communication device with downlink information of a database, the database including location information of a plurality of locations obtained from global positioning signals received by at least one wireless mobile communication device and associated downlink information, obtained from signals received by at least one wireless communication device at each of a plurality of locations; and
determining a location of the wireless mobile communication device based upon location information associated with the correlated downlink information of the database. - View Dependent Claims (72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85)
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Specification