公开(公告)号：US6137441A

公开(公告)日：2000-10-24

申请号：US150500

申请日：1998-09-09

申请人： Jin Dai ,  Nadav Levanon ,  Bill Ames ,  Ed Victor ,  Jim Determan

发明人： Jin Dai ,  Nadav Levanon ,  Bill Ames ,  Ed Victor ,  Jim Determan

IPC分类号： G01S19/25 ,  G01S5/12 ,  H04B7/185 ,  G01S5/02

CPC分类号： H04B7/1855 ,  G01S5/12 ,  G01S19/00 ,  G01S19/38

摘要： The present invention is a system and method for accurately determining the distance (range) between one or more satellites and a user terminal and the rate of change (range rate) of that distance. When accurately determined according to the present invention, these quantities can be used to determine the location of the user terminal with a high degree of accuracy. When one satellite is available, the present invention determines the range and range rate based on the Doppler frequency shift that a signal experiences between the satellite and the user terminal, the round trip delay a signal experiences during transmission from the satellite to the user terminal and back via a satellite to a gateway, the Doppler frequency shift a signal experiences between the satellite and the gateway, and the timestamps of the measurements. When a second satellite is available, the present invention determines the range and range rate between the second satellite and the user terminal based on the round trip delay, the Doppler frequency shift that a signal experiences between the second satellite and the user terminal, and the difference in arrival times at the user terminal of the signals from the satellites.

摘要翻译： 本发明是一种用于精确地确定一个或多个卫星与用户终端之间的距离（范围）和该距离的变化率（范围速率）的系统和方法。 当根据本发明精确地确定时，可以使用这些量来高精度地确定用户终端的位置。 当一个卫星可用时，本发明基于信号在卫星和用户终端之间经历的多普勒频移，信号从卫星到用户终端的传输期间经历的往返延迟，确定范围和范围速率;以及 通过卫星返回到网关，多普勒频移卫星和网关之间的信号以及测量的时间戳。 当第二卫星可用时，本发明基于往返延迟，信号在第二卫星和用户终端之间经历的多普勒频移以及第二卫星可用的多普勒频移，确定第二卫星与用户终端之间的范围和距离率 来自卫星的信号在用户终端的到达时间的差异。