Method and system for localizing mobile communication terminals

摘要

Systems and methods are disclosed for determining a geographic position of a mobile communications terminal operable in a wireless communications network. According to one embodiment, a first estimated position of the mobile communications terminal may be calculated based on pseudo-range measurements related to a plurality of signals received from transmitters of a global navigation satellite system. Moreover, a second estimated position of the mobile communications terminal may be calculated based on information provided by the wireless communications network. The first estimated position may be analyzed to derive an indication of whether at least one of the pseudo-range measurements is affected by errors. If at least one of the pseudo-range measurements is affected by errors at least one third estimated position may be calculated based on a sub-set of pseudo-range measurements and evaluated against the first estimated position.

主权项

1. 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:
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 comparing the first estimated position to the second estimated position to determine whether an estimated accuracy of the first estimated position is higher than an estimated accuracy of the second estimated position; 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:
recursively 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, wherein each recursive calculation excludes a different pseudo-range measurement, and wherein recursively calculating at least one third estimated position comprises calculating at least two third estimated positions, each third estimated position corresponding to a different sub-set of said plurality of signals received from transmitters of the global navigation satellite system;evaluating whether each of the at least two third estimated positions is more accurate than the first estimated position; andin the affirmative case, taking as estimated position of the mobile communications terminal the calculated third estimated position that is closer to the second estimated position.