Abstract: A satellite tracking method is provided. The satellite tracking method first groups satellites into at least two groups on the basis of their arithmetic relationships, then determines whether any satellite of one selected satellite group is within the vision range of a receiving end with the use of a low dimension correlation device, and if that is the case synchronizes the satellite with the receiving end with the use of a full dimension correlation device.

Abstract: An apparatus and method for estimating the angle-of-arrival. The apparatus includes a de-spreading unit, a multipath suppressor, an AOA estimator. The de-spreading unit receives and de-spreads the first and the second spread signals, and outputs the first and the second despread signals. The multipath suppressor receives the first and the second despread signals, suppresses the multipath effects and accordingly outputs the first and the second de-noise signals. The AOA estimator receives the first and the second de-noise signals and outputs the angle-of-arrival accordingly.

Abstract: An apparatus for mobile positioning and a method therefor are disclosed for determining the location of a mobile unit in a wireless communication system. First, an angle of arrival of a wireless signal transmitted by a mobile unit and being incident on a base station is determined by using an arrival angle estimator including a switched cross-correlator, an accumulator, and a phase detector. Next, the distance between the mobile unit and the base station is estimated according to timing information provided by the base station, such as timing-advance parameter of global system for mobile communications. The mobile unit is then positioned according to the angle of arrival and the distance between the base station and the mobile unit. Mobile positioning can be achieved according to the invention, using one base station without substantially modifying the existing base stations. In addition, the performance of positioning can be significantly improved.

Abstract: A blind anti-jammer pre-processor for detecting and alleviating the performance degradation due to strong jammers is disclosed. The anti-jammer pre-processor comprises a jammer detector (10) determining strong jammers based on the eigen-value spread associated with the received data correlation matrix, and an optimal combiner (12) producing nulls for suppressing the detected strong jammers and a main-beam for receiving Signals-of-interest (SOI). The present invention also discloses a GPS receiver comprising the anti-jammer pre-processor (32), a correlator (34), a phase compensator (36), and a hard decision detector (38). The outputs of the anti-jammer pre-processor (32) are sent to the correlator (34) to restore the bit stream. The predetermined 8-bit preambles in the first word associated with each subframe of GPS data are used to estimate the phase rotation introduced by the optimal combiner performed on the SOI.

Abstract: An apparatus and method for estimating the angle-of-arrival. The apparatus comprises a de-spreading unit, a multipath suppressor, an AOA estimator. The de-spreading unit receives and de-spreads the first and the second spread signals, and outputs the first and the second de-spreaded signals. The multipath suppressor receives the first and the second de-spreaded signals, suppresses the multipath effects and accordingly outputs the first and the second de-noise signals. The AOA estimator receives the first and the second de-noise signals and outputs the angle-of-arrival accordingly.

Abstract: An apparatus for mobile positioning and a method therefor are disclosed for determining the location of a mobile unit in a wireless communication system. First, an angle of arrival of a wireless signal transmitted by a mobile unit and being incident on a base station is determined by using an arrival angle estimator including a switched cross-correlator, an accumulator, and a phase detector. Next, the distance between the mobile unit and the base station is estimated according to timing information provided by the base station, such as timing-advance parameter of global system for mobile communications. The mobile unit is then positioned according to the angle of arrival and the distance between the base station and the mobile unit. Mobile positioning can be achieved according to the invention, using one base station without substantially modifying the existing base stations. In addition, the performance of positioning can be significantly improved.