公开(公告)号：WO9953338A3

公开(公告)日：2000-06-22

申请号：PCT/US9907974

申请日：1999-04-12

Applicant: SNAPTRACK INC

Inventor： SHEYNBLAT LEONID ,  KRASNER NORMAN F

IPC: G01S20060101 ,  G01S1/00 ,  G01S1/02 ,  G01S5/00 ,  G01S19/09 ,  G01S19/23 ,  G01S19/25 ,  G01S19/37 ,  G01S19/42 ,  G04G5/00 ,  G04G7/02 ,  G01S5/14

CPC classification number: G01S5/0063 ,  G01S5/0009 ,  G01S5/0036 ,  G01S5/0045 ,  G01S19/09 ,  G01S19/11 ,  G01S19/23 ,  G01S19/235 ,  G01S19/24 ,  G01S19/246 ,  G01S19/25 ,  G01S19/256 ,  G01S19/37 ,  G01S19/39 ,  G01S19/42 ,  G04R20/04 ,  G04R20/06

Abstract: A method and apparatus for determining a reference time associated with a satellite positioning system. In turn, the reference time, in one embodiment, may be used to determine other navigational information. Such navigational information may include, for example, the location/position of a satellite positioning system (SPS) receiver. In one embodiment, a relative velocity between an SPS receiver and a set of one or more satellites is used to determine an offset between time as indicated by the SPS receiver and the reference time. According to another embodiment of the invention, an error statistic is used to determine the reference time. According to yet another embodiment of the invention, two records, each representing at least a portion of a satellite message, are compared to determine time. In one implementation, the SPS receiver is mobile and operates in conjunction with a basestation to determine time and/or other navigational information according to one or a combination of the methods described.

Abstract translation: 一种用于确定与卫星定位系统相关联的参考时间的方法和装置。 反过来，在一个实施例中，参考时间可以用于确定其他导航信息。 这种导航信息可以包括例如卫星定位系统（SPS）接收机的位置/位置。 在一个实施例中，SPS接收机和一个或多个卫星的集合之间的相对速度用于确定由SPS接收机指示的时间与参考时间之间的偏移。 根据本发明的另一实施例，使用误差统计量来确定参考时间。 根据本发明的另一个实施例，比较两个记录，每个记录表示卫星消息的至少一部分，以确定时间。 在一个实现中，SPS接收机是移动的并且与基站一起操作以根据所描述的方法中的一个或组合来确定时间和/或其他导航信息。

公开(公告)号：WO0010030A8

公开(公告)日：2001-02-01

申请号：PCT/US9807471

申请日：1998-04-14

Applicant: SNAPTRACK INC

Inventor： KRASNER NORMAN F

IPC: G01S1/00 ,  G01S5/00 ,  G01S19/09 ,  G01S19/24 ,  G01S19/30 ,  G01S19/37 ,  H04B1/707 ,  G01S5/14 ,  G01S1/04

CPC classification number: H04B1/7077 ,  G01S5/0036 ,  G01S5/0054 ,  G01S19/09 ,  G01S19/30 ,  G01S19/37 ,  H04B1/708 ,  H04B1/7093 ,  H04B2201/70707 ,  H04B2201/70715

Abstract: A method and apparatus of acquiring and tracking global positioning system signals with fast acquisition speed and high sensitivity is disclosed. A pseudo-random noise matching filter operation is performed on a sample of global positioning system signals to provide a current matched filter result. The current matched filter result is then accumulated with a prior matched filter result from a prior sample of global positioning system signals to produce an accumulated matched filter result. Efficient means for implementing the matched filter are disclosed.

Abstract translation: 公开了以快速采集速度和高灵敏度获取和跟踪全球定位系统信号的方法和装置。 对全局定位系统信号的样本执行伪随机噪声匹配滤波器操作以提供电流匹配滤波器结果。 然后使用来自全球定位系统信号的先前样本的先前匹配滤波器结果累积当前匹配滤波器结果，以产生累积的匹配滤波器结果。 公开了用于实现匹配滤波器的有效装置。

公开(公告)号：WO9714049A2

公开(公告)日：1997-04-17

申请号：PCT/US9616161

申请日：1996-10-08

Applicant: SNAPTRACK INC

Inventor： KRASNER NORMAN F

IPC: G01S1/00 ,  G01S5/00 ,  G01S19/05 ,  G01S19/09 ,  G01S19/11 ,  G01S19/23 ,  G01S19/25 ,  G01S19/29 ,  G01S19/34 ,  G01S19/37 ,  G06F1/00 ,  H01Q1/27 ,  H01Q21/28 ,  H03D7/16 ,  H03J7/04 ,  H03J7/06 ,  H04B1/00 ,  H04B1/28 ,  H04B1/38 ,  H04B7/26 ,  H04Q7/34 ,  G01S1/04 ,  G01S1/02 ,  G01S5/14

CPC classification number: H04B1/0007 ,  G01S5/0027 ,  G01S5/0036 ,  G01S5/0054 ,  G01S19/05 ,  G01S19/09 ,  G01S19/254 ,  G01S19/34 ,  G01S2205/008 ,  G06F2221/2111 ,  H01Q1/273 ,  H01Q21/28 ,  H03D7/163 ,  H03J7/04 ,  H03J7/06 ,  H03J2200/11 ,  H04B1/00 ,  H04B1/28 ,  H04B1/3805 ,  H04B2001/3894

Abstract: A GPS receiver in one embodiment includes an antenna which receives GPS signals at an RF frequency from in view satellites; a downconverter coupled to the antenna for reducing the RF frequency of the received GPS signals to an intermediate frequency (IF); a digitizer coupled to the downconverter and sampling the IF GPS signals at a predetermined rate to produce sampled IF GPS signals; a memory coupled to the digitizer storing the sampled IF GPS signals (a snapshot of GPS signals); and a digital signal processor (DSP) coupled to the memory and operating under stored instructions thereby performing Fast Fourier Transform (FFT) operations on the sampled IF GPS signals to provide pseudorange information. These operations typically also include preprocessing and postprocessing of the GPS signals. After a snapshot of data is taken, the receiver front end is powered down. The GPS receiver in one embodiment also includes other power management features and includes, in another embodiment the capability to correct for errors in its local oscillator which is used to sample the GPS signals. The calculation speed of pseudoranges, and sensitivity of operation, is enhanced by the transmission of the Doppler frequency shifts of in view satellites to the receiver from an external source, such as a basestation in one embodiment of the invention.

Abstract translation: 一个实施例中的GPS接收机包括从视频卫星以RF频率接收GPS信号的天线; 耦合到天线的下变频器，用于将接收到的GPS信号的RF频率降低到中频（IF）; 耦合到下变频器并以预定速率对IF GPS信号进行采样以产生采样的IF GPS信号的数字转换器; 耦合到数字转换器的存储器存储采样的IF GPS信号（GPS信号的快照）的存储器; 以及数字信号处理器（DSP），其耦合到存储器并且在存储的指令下操作，从而对采样的IF GPS信号执行快速傅里叶变换（FFT）操作以提供伪距信息。 这些操作通常还包括GPS信号的预处理和后处理。 拍摄数据快照后，接收机前端将关闭电源。 在一个实施例中，GPS接收机还包括其他功率管理特征，并且在另一个实施例中包括校正用于对GPS信号进行采样的本地振荡器中的错误的能力。 通过在本发明的一个实施例中的诸如基站之类的外部源将观测卫星的多普勒频移传输到接收机，增强了伪距的计算速度和操作灵敏度。

公开(公告)号：WO0045191A3

公开(公告)日：2000-12-07

申请号：PCT/US0001704

申请日：2000-01-24

Applicant: SNAPTRACK INC

Inventor： SHEYNBLAT LEONID ,  KRASNER NORMAN F

IPC: G01S1/00 ,  G01S1/02 ,  G01S5/00 ,  G01S5/02 ,  G01S19/20 ,  G01S19/21 ,  G01S19/22 ,  G01S19/24 ,  G01S19/25 ,  G01S19/28 ,  G01S19/40 ,  H04B7/185 ,  H04Q7/34 ,  G01S1/04

CPC classification number: G01C21/206 ,  G01S5/0036 ,  G01S5/0252 ,  G01S19/09 ,  G01S19/20 ,  G01S19/21 ,  G01S19/22 ,  G01S19/24 ,  G01S19/28 ,  G01S19/30 ,  G01S19/34 ,  G01S19/40 ,  G01S19/50 ,  G01S2205/008 ,  H04B7/18513

Abstract: A method and apparatus is disclosed for measurement processing of Satellite Positioning System (SPS) signals. A plurality of SPS signals from a corresponding plurality of SPS satellites are received in an SPS receiver. The signal environment corresponding to the location in which the SPS receiver is located is characterized to produce signal environment data. In one exemplary embodiment, an information source, such as a cellular network based database, is searched to retrieve the signal environment data given an approximate location of the GPS receiver. This approximate location may be specified by a location of a cell site which is in cellular radio communication with a cellular communication device which is co-located with the GPS receiver. One or more parameters related to signal characteristics of the satellite signals are defined. Threshold values for the parameters are determined using the signal environment data. Code phases corresponding to times of arrival of respective satellite signals from the plurality of satellites are measured. The data representing measured times of arrival are examined using threshold values for the parameters to produce a set of times of arrival from which a location fix for the GPS receiver is calculated. Other methods and apparatuses for other embodiments of the invention are also described.

Abstract translation: 公开了一种用于卫星定位系统（SPS）信号的测量处理的方法和设备。 在SPS接收器中接收来自相应的多个SPS卫星的多个SPS信号。 对应于SPS接收机所处位置的信号环境被表征为产生信号环境数据。 在一个示例性实施例中，搜索信息源（例如基于蜂窝网络的数据库）以在给定GPS接收器的大致位置的情况下检索信号环境数据。 该近似位置可以由与蜂窝通信设备蜂窝无线电通信的蜂窝站点的位置来指定，蜂窝通信设备与GPS接收器位于同一位置。 定义了与卫星信号的信号特性有关的一个或多个参数。 使用信号环境数据确定参数的阈值。 测量对应于来自多个卫星的各个卫星信号到达时间的码相位。 表示测量的到达时间的数据使用参数的阈值进行检查，以产生一组到达时间，从中计算GPS接收机的定位。 还描述了用于本发明的其他实施例的其他方法和设备。

公开(公告)号：WO9825157A2

公开(公告)日：1998-06-11

申请号：PCT/US9721260

申请日：1997-11-20

Applicant: SNAPTRACK INC

Inventor： KRASNER NORMAN F

IPC: G01S1/00 ,  G01S5/00 ,  G01S5/14 ,  G01S19/06 ,  G01S19/07 ,  G01S19/08 ,  G01S19/09 ,  G01S19/11 ,  G01S19/23 ,  G01S19/25 ,  G01S19/41 ,  G06F1/00 ,  H01Q1/27 ,  H01Q21/28 ,  H03D7/16 ,  H03J7/04 ,  H03J7/06 ,  H04B1/00 ,  H04B1/28 ,  H04B1/38 ,  H04B7/185 ,  G01S1/04

CPC classification number: G01S19/41 ,  G01S5/0036 ,  G01S5/0045 ,  G01S5/0054 ,  G01S5/009 ,  G01S19/06 ,  G01S19/07 ,  G01S19/09 ,  G01S19/11 ,  G01S19/235 ,  G01S19/252 ,  G01S19/254 ,  G01S19/256 ,  G01S19/258 ,  G01S2205/008 ,  G06F2221/2111 ,  H01Q1/273 ,  H01Q21/28 ,  H03D7/163 ,  H03J1/0008 ,  H03J7/04 ,  H03J7/047 ,  H03J7/06 ,  H03J2200/11 ,  H04B1/00 ,  H04B1/0007 ,  H04B1/28 ,  H04B1/3805

Abstract: Methods and apparatuses for deriving an approximate Doppler for a satellite positioning system (SPS) receiver from an approximate location which is obtained from a cellular communication system information source. In one embodiment, an approximate location of the SPS receiver is derived from the information source and this approximation location is used to determine approximate Dopplers to a plurality of SPS satellites at a given time. The approximate Dopplers are then used to reduce processing time in either determining pseudoranges to the SPS satellites or acquiring signals from the SPS satellites. In another aspect of the invention, a reference signal is used to provide a local oscillator signal which is used to acquire SPS signals in an SPS receiver. This reference signal is extracted from a data signal modulated on a carrier frequency. The data signal on the carrier frequency is transmitted from, in one example, a wireless cell site which is communicating with the SPS receiver which has a cellular based communication receiver.

Abstract translation: 从从蜂窝通信系统信息源获得的近似位置导出用于卫星定位系统（SPS）接收机的近似多普勒的方法和装置。 在一个实施例中，从信息源导出SPS接收机的近似位置，并且该近似位置用于在给定时间确定到多个SPS卫星的近似多普勒。 然后使用近似多普勒来减少对SPS卫星的伪距或从SPS卫星采集信号的处理时间。 在本发明的另一方面，参考信号用于提供用于在SPS接收机中采集SPS信号的本地振荡器信号。 该参考信号从在载波频率上调制的数据信号中提取出来。 在一个示例中，载波频率上的数据信号从与具有基于蜂窝的通信接收机的SPS接收机通信的无线小区站点发送。