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    A GPS receiver and method for processing GPS signals
    76.
    发明公开
    A GPS receiver and method for processing GPS signals 失效
    GPS接收器和方法，用于处理GPS信号

    公开(公告)号：EP1260830A3

    公开(公告)日：2003-05-28

    申请号：EP02015127.0

    申请日：1996-10-08

    申请人： Snaptrack, Inc.

    发明人： Krasner, Norman F.

    IPC分类号： G01S5/14 ,  G01S1/04

    CPC分类号： H04B1/3805 ,  G01S5/0027 ,  G01S5/0036 ,  G01S5/0054 ,  G01S19/07 ,  G01S19/09 ,  G01S19/11 ,  G01S19/235 ,  G01S19/252 ,  G01S19/254 ,  G01S19/256 ,  G01S19/258 ,  G01S19/34 ,  G01S19/41 ,  G01S2205/008 ,  G06F2221/2111 ,  H01Q1/273 ,  H01Q21/28 ,  H03D7/163 ,  H03J7/06 ,  H03J2200/11

    摘要： A global positioning system (GPS) receiver has first circuitry for receiving and processing pseudorandom sequences transmitted by a number of GPS satellites. The first circuitry is configured to perform conventional correlation operations on the received pseudorandom sequences to determine pseudoranges from the GPS receiver to the GPS satellites. The GPS receiver also includes second circuitry coupled to the first circuitry. The second circuitry is configured to receive and process the pseudorandom sequences during blockage conditions. The second circuitry processes the pseudorandom sequences by digitizing and storing a predetermined record length of the received sequences and then performing fast convolution operations on the stored data to determine the pseudoranges. The GPS receiver may have a common circuitry for receiving GPS signals from in view satellites and downconverting the RF frequency of the received GPS signals to an intermediate frequency (IF). The IF signals are split into two signal paths, a first of which provides the conventional correlation processing to calculate the pseudoranges. During blockage conditions, the IF signal is passed to the second signal path wherein the IF signals are digitized and stored in memory and later processed using the fast convolution operations to provide the pseudoranges. Alternative arrangements for the two signal paths include separate downconverters or shared digitizers. One embodiment provides both signal paths on a single integrated circuit with shared circuitry executing computer-readable instructions to perform GPS signal processing appropriate to the reception conditions.

    SATELLITE POSITIONING SYSTEM AUGMENTATION WITH WIRELESS COMMUNICATION SIGNALS
    78.
    发明公开
    SATELLITE POSITIONING SYSTEM AUGMENTATION WITH WIRELESS COMMUNICATION SIGNALS 有权
    支持与无线通信信号的卫星定位系统

    公开(公告)号：EP1073913A1

    公开(公告)日：2001-02-07

    申请号：EP99918503.6

    申请日：1999-04-12

    申请人： Snaptrack, Inc.

    发明人： SHEYNBLAT, Leonid

    IPC分类号： G01S5/14

    CPC分类号： G01S19/46

    摘要： A method and apparatus for processing position information from satellite positioning system satellites and from cellular based communication signals. In one example of a method according to the invention, a SPS receiver receives SPS signals from at least one SPS satellite. This SPS receiver is coupled to and typically integrated with a communication system which receives and transmits messages in a cell based communication system. In this method, a message is transmitted in the cell based communication signals between a communication system and a first cell based transceiver. A time measurement which represents a time of travel of a message in the cell based communication signals between the cell based transceiver and the communication system is determined. Another time measurement which represents a time of travel of the SPS signals is also determined. A position of the SPS receiver is determined from a combination of at least the time measurement which represents the time of travel of a message in the cell based communication signals and from a time measurement which represents a time of travel of the SPS signals. The cell based communication signals are capable of communicating data messages in a two-way direction in one embodiment between the cell based transceiver and the communication system.