公开(公告)号：US20070183486A1

公开(公告)日：2007-08-09

申请号：US11347498

申请日：2006-02-03

申请人： MingQiang Cheng ,  Cheng Li ,  Bo Yu ,  ShiJie Li ,  Xiquan Yang ,  Yi Zeng

发明人： MingQiang Cheng ,  Cheng Li ,  Bo Yu ,  ShiJie Li ,  Xiquan Yang ,  Yi Zeng

IPC分类号： H04B1/00

CPC分类号： G01S19/25 ,  G01S19/254 ,  G01S19/258

摘要： The present invention is a method for GPS positioning in a weak signal environment. The method includes obtaining assistance data for a GPS signal from a satellite at a predetermined time, wherein the assistance data including predicted navigation data, Doppler shift and Doppler shift rate and the GPS signal being modulated by a carrier signal, a pseudorandom code and navigation data, estimating a predicted receiving time for the GPS signal reaching the GPS receiver, capturing the GPS signal, converting the GPS signal to an intermediate frequency signal, acquiring a code phase of the pseudorandom code from the intermediate frequency signal by using the assistance data and the predicted receiving time, and obtaining a position for the GPS receiver based on the predicted navigation data and the code phase of the pseudorandom code. To acquire the code phase of the pseudorandom code, the GPS receiver corrects a real time clock to one millisecond accuracy and process the intermediate frequency signal through coherent correlation of one second.

摘要翻译： 本发明是一种在弱信号环境中进行GPS定位的方法。 该方法包括在预定时间从卫星获取GPS信号的辅助数据，其中辅助数据包括预测的导航数据，多普勒频移和多普勒频移以及由载波信号调制的GPS信号，伪随机码和导航数据 估计到达GPS接收机的GPS信号的预测接收时间，捕获GPS信号，将GPS信号转换成中频信号，通过使用辅助数据从中频信号获取伪随机码的码相位， 预测的接收时间，并且基于所预测的导航数据和伪随机码的码相位来获得GPS接收机的位置。 为了获取伪随机码的代码阶段，GPS接收机将实时时钟校正为1毫秒精度，并通过1秒的相干相关处理中频信号。

公开(公告)号：US07710317B2

公开(公告)日：2010-05-04

申请号：US11347498

申请日：2006-02-03

申请人： MingQiang Cheng ,  Cheng Li ,  Bo Yu ,  ShiJie Li ,  Xiquan Yang ,  Yi Zeng

发明人： MingQiang Cheng ,  Cheng Li ,  Bo Yu ,  ShiJie Li ,  Xiquan Yang ,  Yi Zeng

IPC分类号： G01S1/00 ,  G01S1/02

CPC分类号： G01S19/25 ,  G01S19/254 ,  G01S19/258

摘要： The present invention is a method for GPS positioning in a weak signal environment. The method includes obtaining assistance data for a GPS signal from a satellite at a predetermined time, wherein the assistance data including predicted navigation data, Doppler shift and Doppler shift rate and the GPS signal being modulated by a carrier signal, a pseudorandom code and navigation data, estimating a predicted receiving time for the GPS signal reaching the GPS receiver, capturing the GPS signal, converting the GPS signal to an intermediate frequency signal, acquiring a code phase of the pseudorandom code from the intermediate frequency signal by using the assistance data and the predicted receiving time, and obtaining a position for the GPS receiver based on the predicted navigation data and the code phase of the pseudorandom code. To acquire the code phase of the pseudorandom code, the GPS receiver corrects a real time clock to one millisecond accuracy and process the intermediate frequency signal through coherent correlation of one second.

摘要翻译： 本发明是一种在弱信号环境中进行GPS定位的方法。 该方法包括在预定时间从卫星获取GPS信号的辅助数据，其中辅助数据包括预测的导航数据，多普勒频移和多普勒频移以及由载波信号调制的GPS信号，伪随机码和导航数据 估计到达GPS接收机的GPS信号的预测接收时间，捕获GPS信号，将GPS信号转换成中频信号，通过使用辅助数据从中频信号获取伪随机码的码相位， 预测的接收时间，并且基于所预测的导航数据和伪随机码的码相位来获得GPS接收机的位置。 为了获取伪随机码的代码阶段，GPS接收机将实时时钟校正为1毫秒精度，并通过1秒的相干相关处理中频信号。