METHOD AND SYSTEM FOR LOCALIZING MOBILE COMMUNICATION TERMINALS
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Abstract
A method of determining a geographic position of a mobile communications terminal operable in a wireless communications network includes a receiver of signals of a global navigation satellite system, includes calculating a first estimated position of the mobile communications terminal based on pseudo-range measurements related to a plurality of signals received from transmitters of the global navigation satellite system; calculating a second estimated position of the mobile communications terminal based on information provided by the wireless communications network; and analyzing the first estimated position to derive an indication of whether at least one of the pseudo-range measurements is affected by errors. The analyzing includes exploiting the calculated second estimated position to derive the indication. If the indication that at least one of the pseudo-range measurements is affected by errors is obtained as a result of the analyzing, calculating at least one third estimated position based on pseudo-range measurements related to a respective sub-set of the plurality of signals received from transmitters of the global navigation satellite system, evaluating whether the at least one third estimated position is more accurate than the first estimated position; and if affirmative, taking as estimated position of the mobile communications terminal the calculated third estimated position.
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Citations
22 Claims
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1-11. -11. (canceled)
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12. A method of determining a geographic position of a mobile communications terminal operable in a wireless communications network and comprising a receiver of signals of a global navigation satellite system, comprising:
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calculating a first estimated position of the mobile communications terminal based on pseudo-range measurements related to a plurality of signals received from transmitters of the global navigation satellite system; calculating a second estimated position of the mobile communications terminal based on information provided by the wireless communications network; analyzing the first estimated position to derive an indication of whether at least one of the pseudo-range measurements is affected by errors, wherein said analyzing comprises exploiting the calculated second estimated position to derive said indication; in case an indication that at least one of the pseudo-range measurements is affected by errors is obtained as a result of said analyzing; calculating at least one third estimated position based on pseudo-range measurements related to a respective sub-set of said plurality of signals received from transmitters of the global navigation satellite system; evaluating whether the at least one third estimated position is more accurate than the first estimated position; and in the affirmative case, taking as estimated position of the mobile communications terminal the calculated third estimated position. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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21. A system for determining a geographic position of a mobile communications terminal operable in a wireless communications network and comprising a receiver of signals of a global navigation satellite system comprising:
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first calculation modules operable to calculate a first estimated position of the mobile communications terminal based on pseudo-range measurements related to a plurality of signals received from transmitters of the global navigation satellite system; second calculation modules operable to calculate a second estimated position of the mobile communications terminal based on information provided by the wireless communications network; estimated position analysis modules operable to analyze the first estimated position exploiting the second estimated position to derive an indication of whether at least one of the pseudo-range measurements is affected by errors and, in case an indication is derived that at least one of the pseudo-range measurements is affected by errors as a result of said analyzing, further operable to; cause the first calculation modules to calculate at least one third estimated positions based on pseudo-range measurements related to a respective sub-set of said plurality of signals received from transmitters of the global navigation satellite system; evaluate whether the at least one third estimated position is more accurate than the first estimated position; and in the affirmative case, take as estimated position of the mobile communications terminal the third estimated position.
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22. A mobile communications terminal operable in a wireless communications network and comprising a receiver of signals of a global navigation satellite system, comprising:
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a calculation module operable to calculate a first estimated position of the mobile communications terminal based on pseudo-range measurements related to a plurality of signals received from transmitters of the global navigation satellite system; an estimated position analysis module operable to receive a second estimated position from the wireless communication network and to analyze the first estimated position exploiting the second estimated position to derive an indication of whether at least one of the pseudo-range measurements is affected by errors and, in case an indication is derived that at least one of the pseudo-range measurements is affected by errors as a result of said analyzing, further operable to; cause the calculation module to calculate at least one third estimated position based on pseudo-range measurements related to a respective sub-set of said plurality of signals received from transmitters of the global navigation satellite system; evaluate whether the at least one third estimated position is more accurate than the first estimated position; and in the affirmative case, take as estimated position of the mobile communications terminal the third estimated position.
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Specification