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1. 发明授权

US5798732A GPS receiver having a fast time to first fix 失效
标题翻译： GPS接收机具有快速首次固定的时间
公开(公告)号：US5798732A
公开(公告)日：1998-08-25
申请号：US716112
申请日：1996-09-19
申请人： Ralph F. Eshenbach
发明人： Ralph F. Eshenbach
IPC分类号： G01S1/00 , G01S5/00 , H04L27/30 , H04B7/185
CPC分类号： G01S19/235 , G01S19/243 , G01S5/0018
摘要： A global positioning system (GPS) receiver and a method having a fast time to first fix (TTFF) using GPS signal Doppler frequency shifts for correcting the local clock time and using information for an expected GPS message for synchronizing the corrected local clock time to GPS time. The GPS receiver includes radio frequency (RF) circuitry for receiving and downconverting a spread spectrum GPS satellite signal, a correlator for despreading the downconverted GPS signal and providing a GPS bit stream, a clock for providing a local time, and a processor including an executable code. The executable code includes a Doppler correction code for improving the accuracy of the local time by comparing a measured and a calculated Doppler frequency shift for the GPS satellite signal from three or more GPS satellites, and a GPS synchronization code for synchronizing the local time so that the timing of a replica bit stream based upon information for an expected GPS message matches the timing a GPS bit stream received in the GPS satellite signal.
摘要翻译：一种全球定位系统（GPS）接收机和一种使用GPS信号多普勒频移进行首次固定的快速时间（TTFF）的方法，用于校正本地时钟时间，并使用用于将校正后的本地时钟时间与GPS同步的预期GPS信息时间。 GPS接收机包括用于接收和下变频扩频GPS卫星信号的射频（RF）电路，用于解扩下变频GPS信号并提供GPS位流的相关器，用于提供本地时间的时钟，以及包括可执行程序的处理器码。可执行代码包括用于通过比较来自三个或更多个GPS卫星的GPS卫星信号的测量和计算的多普勒频移以及用于同步本地时间的GPS同步码来改善本地时间的精度的多普勒校正码，基于预期GPS消息的信息的复制比特流的定时与在GPS卫星信号中接收的GPS比特流的定时相匹配。

2. 发明授权

US5663735A GPS receiver using a radio signal for improving time to first fix 失效
标题翻译： GPS接收机使用无线电信号改善时间首先固定
公开(公告)号：US5663735A
公开(公告)日：1997-09-02
申请号：US650482
申请日：1996-05-20
申请人： Ralph F. Eshenbach
发明人： Ralph F. Eshenbach
IPC分类号： G01S1/00 , H04B7/185 , G01S5/02
CPC分类号： G01S19/235 , G04R20/04
摘要： A global positioning system (GPS) receiver apparatus using time and frequency information derived from a radio signal other than the GPS satellite signal for improving the time to first fix (TTFF). The GPS receiver apparatus includes a GPS signal receiver for receiving a GPS satellite signal modulated with data bits and a radio signal receiver for receiving a radio signal having a standard time and/or a standard frequency. The radio signal receiver provides standard time information to the GPS signal receiver. The GPS signal receiver uses the standard time information to resolve a GPS time for a time of arrival of a data bit. The GPS signal receiver includes a propagation delay calibrator for correcting the standard time for the travel time due to the path length for the radio signal. The radio signal receiver uses a reference clock signal provided by the GPS signal receiver for determining a frequency error between a frequency of the reference clock signal and the standard frequency. The GPS signal receiver uses the frequency error for pre-tuning to the carrier frequency of the GPS satellite signal.
摘要翻译：一种使用从GPS卫星信号以外的无线信号导出的时间和频率信息的全球定位系统（GPS）接收装置，用于改善首次固定时间（TTFF）。 GPS接收机装置包括：GPS信号接收机，用于接收用数据比特调制的GPS卫星信号;以及无线电信号接收机，用于接收具有标准时间和/或标准频率的无线电信号。无线电信号接收机向GPS信号接收机提供标准时间信息。 GPS信号接收机使用标准时间信息来解析数据位到达时间的GPS时间。 GPS信号接收机包括传播延迟校准器，用于校正由于无线电信号的路径长度而导致的行进时间的标准时间。无线电信号接收机使用由GPS信号接收机提供的参考时钟信号来确定参考时钟信号的频率与标准频率之间的频率误差。 GPS信号接收机使用频率误差预先调谐到GPS卫星信号的载波频率。

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