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    SIGNAL DETECTOR EMPLOYING CORRELATION ANALYSIS OF NON-UNIFORM AND DISJOINT SAMPLE SEGMENTS
    4.
    发明授权
    SIGNAL DETECTOR EMPLOYING CORRELATION ANALYSIS OF NON-UNIFORM AND DISJOINT SAMPLE SEGMENTS 有权
    具有非均匀和孤立ABTASTSEGMENTEN的相关分析信号检测器

    公开(公告)号：EP1173778B1

    公开(公告)日：2008-12-17

    申请号：EP00919870.6

    申请日：2000-03-29

    申请人： SiRF Technology, Inc.

    发明人： GRONEMEYER, Steven, A.

    IPC分类号： G01S3/16 ,  G01S1/04

    CPC分类号： G01S19/30 ,  G01S19/29

    摘要： A signal detector receives multiple segments of a signal, where the segments are from separate and distinct time periods. The signals arrive at a receiver (30), which passes them to a correlator (34). The correlator (34) correlates the received signals with hypothesis outputs of the expected contents of the segments. These hypothesis outputs are from a hypothesis generator (32). The correlated output of the correlator (34) is fed to a combiner (36), which outputs the correlated signal. The combiner has an additional output back to the receiver (30) by which it may request additional received segments.

    SIGNAL DETECTOR AND METHOD EMPLOYING A COHERENT ACCUMULATION SYSTEM TO CORRELATE NON-UNIFORM AND DISJOINT SAMPLE SEGMENTS
    6.
    发明授权
    SIGNAL DETECTOR AND METHOD EMPLOYING A COHERENT ACCUMULATION SYSTEM TO CORRELATE NON-UNIFORM AND DISJOINT SAMPLE SEGMENTS 有权
    信号检测器和方法相干积累SYSTEM FOR关联采样的不同，不相交段

    公开(公告)号：EP1301803B1

    公开(公告)日：2008-08-06

    申请号：EP01919707.8

    申请日：2001-04-17

    申请人： SiRF Technology, Inc.

    发明人： GRONEMEYER, Steven, A.

    IPC分类号： G01S1/04 ,  G01S5/14 ,  H04B1/707

    CPC分类号： G01S19/235 ,  G01S19/254 ,  G01S19/256 ,  G01S19/29 ,  G01S19/30 ,  H04B1/707 ,  H04L2027/0034

    摘要： A signal detector employs a coherent accumulation system that coherently combines the correlation results derived from segments of samples of a received signal. The segments may have non-uniform lengths and may have been obtained over different and non-overlapping time periods. The segments are obtained during sampling windows of arbitrary length and at arbitrary times, and the results of processing the segments are successively combined in a coherent manner (separate magnitude and phase accumulation) until a threshold signal-to-noise ratio (SNR) has been achieved. Coherent integration is enabled by introducing a carrier phase offset as well as a code phase offset, so that different segments are aligned in carrier phase as well as code phase. Although not limited to this application, in one implementation example, the signal detector is used in connection with and as part of a global positioning system (GPS) receiver.

    AIDING IN A SATELLITE POSITIONING SYSTEM
    7.
    发明授权
    AIDING IN A SATELLITE POSITIONING SYSTEM 有权
    有助于卫星定位系统

    公开(公告)号：EP1512028B1

    公开(公告)日：2007-10-31

    申请号：EP03755454.0

    申请日：2003-05-22

    申请人： SiRF Technology, Inc.

    发明人： GARIN, Lionel-Jacques ,  PENG, Lion, Kuo-Liang ,  ZHANG, Gengsheng ,  VANTALON, Nicolas, P.

    IPC分类号： G01S5/14 ,  G01S1/02

    CPC分类号： G01S19/235 ,  G01S19/254 ,  G01S19/256 ,  G01S19/37

    摘要： The invention relates to an aided Global Positioning System (GPS) subsystem within a wireless device. The wireless device includes a wireless processing section capable of receiving signals from a wireless network and a GPS subsystem having a radio frequency (RF) front-end capable of receiving a GPS satellite signal. The wireless processing section of the wireless device receives an external clock and determines the offset between the clock in the wireless processing section and that of the external clock. The GPS subsystem then receives the offset information from the wireless processing section, information related to the nominal frequency of the wireless processing section clock and the wireless processing section clock. Using this information and the GPS clock in the GPS subsystem, the GPS subsystem determines an acquiring signal, which is related to a frequency offset between the GPS clock and the network clock. The GPS subsystem then acquires GPS satellite signals in an acquiring unit though the use of the acquiring signal.

    DETERMINING POSITION WITHOUT USE OF BROADCAST EPHEMERIS INFORMATION
    8.
    发明公开
    DETERMINING POSITION WITHOUT USE OF BROADCAST EPHEMERIS INFORMATION 有权
    定位不使用发射的星历信息

    公开(公告)号：EP1794612A2

    公开(公告)日：2007-06-13

    申请号：EP05798125.0

    申请日：2005-09-08

    申请人： SiRF Technology, Inc.

    发明人： GARIN, Lionel J. ,  PHATAK, Makarand S.

    IPC分类号： G01S5/14

    CPC分类号： G01S19/27 ,  G01S19/05 ,  G01S19/20 ,  G01S19/258 ,  G01S19/51

    摘要： Devices and methods are described for determining position information without broadcast ephemeris data for extended time periods. A server or client device 110 receives or collects historical state data of satellites of a satellite-based positioning system and generates predictions of future satellite trajectories for future time periods. When a server generates the predictions, the predictions are subsequently transferred to a client device. The client device selects predictions appropriate to time of interest. The time can be any time during a period of at least seven calendar days. The client device reconstructs satellite states using information on the predictions and uses the reconstructed satellite states to acquire satellite signals as appropriate to the current location and time of the client device. The client device determines and/or tracks its position using information of the satellite states and timing information of the satellite signals.