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    A GPS receiver and method for processing GPS signals
    31.
    发明公开
    A GPS receiver and method for processing GPS signals 失效
    GPS-Empfängerund Verfahren zur Verarbeitung von GPS-Signalen

    公开(公告)号：EP1260830A2

    公开(公告)日：2002-11-27

    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

    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.

    摘要翻译： 全球定位系统（GPS）接收器具有用于接收和处理由多个GPS卫星发送的伪随机序列的第一电路。 第一电路被配置为对所接收的伪随机序列执行传统的相关操作，以确定从GPS接收器到GPS卫星的伪距。 GPS接收机还包括耦合到第一电路的第二电路。 第二电路被配置为在阻塞条件期间接收和处理伪随机序列。 第二电路通过数字化并存储接收到的序列的预定记录长度，然后对所存储的数据执行快速卷积运算来确定伪距，来处理伪随机序列。 GPS接收机可以具有用于从视野卫星接收GPS信号并将接收到的GPS信号的RF频率下变频到中频（IF）的公共电路。 IF信号被分成两个信号路径，第一个信号路径提供常规的相关处理来计算伪距离。 在阻塞条件期间，IF信号被传递到第二信号路径，其中IF信号被数字化并存储在存储器中，并且随后使用快速卷积运算来处理以提供伪距。 两个信号路径的替代布置包括单独的下变频器或共享数字转换器。 一个实施例在单个集成电路上提供信号路径，共享电路执行计算机可读指令以执行适合于接收条件的GPS信号处理。

    METHOD AND SYSTEM FOR USING ALTITUDE INFORMATION IN A SATELLITE POSITIONING SYSTEM
    32.
    发明公开
    METHOD AND SYSTEM FOR USING ALTITUDE INFORMATION IN A SATELLITE POSITIONING SYSTEM 有权
    方法和装置用于利用高度信息的位置。在卫星定位系统

    公开(公告)号：EP1145035A2

    公开(公告)日：2001-10-17

    申请号：EP99927073.9

    申请日：1999-04-13

    申请人： Snaptrack, Inc.

    发明人： SHEYNBLAT, Leonid

    IPC分类号： G01S5/00

    CPC分类号： G01S19/46 ,  G01S19/20 ,  G01S19/50

    摘要： A method and apparatus for determining a position of a mobile satellite positioning system (SPS) receiver. In one example of a method, a cell object information is determined; this cell object information comprises at least one of a cell object location or a cell object identification. An altitude is determined from the cell object information which is selected based upon a cell site transmitter which is in wireless communication with a cell based communication system which is coupled to (and typically integrated with) the mobile SPS receiver. The position of the mobile SPS receiver is calculated using the altitude which is determined from the cell object information. In another example of a method, an altitude pseudomeasurement is determined from an estimate of an altitude of the mobile SPS receiver. This estimate of the altitude may be from a cell based information source in a cell based system or may be an average altitude of the area of radio coverage of a wireless base station in the non-cell based system. The altitude pseudomeasurement may be used as a redundant measurement with fault detection and isolation techniques to determine whether at least one pseudorange has a faulty condition. Alternatively (or in addition), a comparison of the estimated altitude to a calculated altitude determines a condition of at least one pseudorange between an SPS satellite and the mobile SPS receiver. In one embodiment of this example, the position is determined from a position solution algorithm, and if the condition is a first state (not a fault state) the at least one pseudorange is used in the position solution algorithm.

    METHOD AND APPARATUS FOR ACQUIRING SATELLITE POSITIONING SYSTEM SIGNALS
    33.
    发明公开
    METHOD AND APPARATUS FOR ACQUIRING SATELLITE POSITIONING SYSTEM SIGNALS 有权
    方法和系统检测卫星定位系统信号的

    公开(公告)号：EP1108223A1

    公开(公告)日：2001-06-20

    申请号：EP99938750.9

    申请日：1999-07-15

    申请人： Snaptrack, Inc.

    发明人： KRASNER, Norman, F.

    IPC分类号： G01S5/14 ,  G01S5/00

    CPC分类号： G01S19/252 ,  G01S5/0027 ,  G01S19/06 ,  G01S19/07 ,  G01S19/09 ,  G01S19/235 ,  G01S19/28 ,  G01S19/30 ,  G01S19/46 ,  G01S2205/008 ,  H03J7/04 ,  H03J7/047 ,  H04B1/00 ,  H04B1/0007 ,  H04B1/28 ,  H04B1/3805

    摘要： A method and an apparatus which acquire satellite positioning system (SPS) signals in an SPS receiver. Information on time of day, approximate receiver location, and satellite positions are used to reduce the time to search and acquire signals from one or more SPS satellites. In an example of a method of the invention, a first pseudorange to a first SPS satellite is determined, and an approximate location of the SPS receiver is determined. An estimated pseudorange for a second pseudorange to a second SPS satellite is determined from the approximate location and a satellite position of the second SPS satellite. The SPS receiver then searches for SPS signals from the second SPS satellite in a range determined by the estimated pseudorange. Typically, this method reduces the search time to initially acquire SPS signals from the second SPS satellite, and the estimated pseudorange is not based on a previously determined pseudorange for said second SPS satellite. In a particular example of the invention, the approximate location is determined from a cell based information source which correlates an identification of each of various wireless cell sites with an approximate location for objects within a cell of a wireless cell based communication system, such as a cellular (or cell based) telephone system. In other examples of the invention, relatively precise time of day information may be used with information indicating satellite positions and information indicating the approximate location to determine an estimated pseudorange for a first SPS satellite to be acquired.

    METHOD AND APPARATUS FOR OPERATING A SATELLITE POSITIONING SYSTEM RECEIVER
    34.
    发明公开
    METHOD AND APPARATUS FOR OPERATING A SATELLITE POSITIONING SYSTEM RECEIVER 有权
    用于操作卫星定位系统接收器的方法和设备

    公开(公告)号：EP1076834A1

    公开(公告)日：2001-02-21

    申请号：EP99927072.1

    申请日：1999-04-13

    申请人： Snaptrack, Inc.

    发明人： KRASNER, Norman, F.

    IPC分类号： G01S5/14 ,  G01S5/00

    CPC分类号： G01S19/41 ,  G01S5/0036 ,  G01S19/08 ,  G01S19/09

    摘要： A method and an apparatus for operating a satellite positioning system (SPS) receiver in a client/server architecture. In one example of a method, a first plurality of pseudoranges is determined at a first time and a second plurality of pseudoranges is determined at a second time which is after the first time. The first and the second pluralities of pseudoranges are stored. After the second time, the first and the second pluralities of pseudoranges are transmitted to a location server, normally in one transmission. The location server then determines a first position from the first plurality of pseudoranges and a second position from the second plurality of pseudoranges. In one particular example, the first and second pseudoranges are transmitted in response to a predetermined type of event, and the location server stores a collection of differential GPS data which has been collected over time.

    摘要翻译： 一种用于在客户机/服务器体系结构中操作卫星定位系统（SPS）接收机的方法和设备。 在方法的一个示例中，第一时间确定第一多个伪距，并且在第一时间之后的第二时间确定第二多个伪距。 存储第一和第二多个伪距。 在第二次之后，第一和第二多个伪距被发送到位置服务器，通常在一次传输中。 位置服务器然后确定来自第一多个伪距的第一位置和来自第二多个伪距的第二位置。 在一个特定示例中，响应于预定类型的事件来发送第一和第二伪距，并且位置服务器存储随时间收集的差分GPS数据的集合。