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1.发明授权ACCURATE RANGE AND RANGE RATE DETERMINATION IN A SATELLITE COMMUNICATIONS SYSTEM 有权距离和距离的变化，在卫星通信系统准确测定
公开(公告)号：EP1110100B1
公开(公告)日：2007-04-04
申请号：EP99951409.4
申请日：1999-09-08
发明人： DAI, Jin , LEVANON, Nadav , AMES, Bill , VICTOR, Ed , DETERMAN, Jim
IPC分类号： G01S5/12
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 and range rate) between one or more satellites (116, 118) and a user terminal (124, 126) in order to determine the location of the user terminal (124, 126). When one satellite is available, the present invention determines the range (516) and range rate (516) based on the Doppler frequency shift (504) between the satellite (116, 118) and the user terminal (124, 126), the round trip delay (510) from the satellite (116, 118) to the user terminal (124, 126) and back via a satellite to a gateway (120, 122), the Doppler frequency shift (512) between the satellite (116, 118) and the gateway (120, 122), and the timestamps of the measurements (506, 514). When a second satellite is available, the present invention determines the range (610) and range rate (610) between the second satellite and the user terminal (124, 126) based on the round trip delay, the Doppler frequency shift between the second satellite and the user terminal (124, 126), and the difference in arrival times (604) at the user terminal (124, 126) of the signals from the satellites (116, 118).
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2.发明公开ACCURATE RANGE AND RANGE RATE DETERMINATION IN A SATELLITE COMMUNICATIONS SYSTEM 有权距离和距离的变化，在卫星通信系统准确测定
公开(公告)号：EP1110100A1
公开(公告)日：2001-06-27
申请号：EP99951409.4
申请日：1999-09-08
发明人： DAI, Jin , LEVANON, Nadav , AMES, Bill , VICTOR, Ed , DETERMAN, Jim
IPC分类号： G01S5/12
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 and range rate) between one or more satellites (116, 118) and a user terminal (124, 126) in order to determine the location of the user terminal (124, 126). When one satellite is available, the present invention determines the range (516) and range rate (516) based on the Doppler frequency shift (504) between the satellite (116, 118) and the user terminal (124, 126), the round trip delay (510) from the satellite (116, 118) to the user terminal (124, 126) and back via a satellite to a gateway (120, 122), the Doppler frequency shift (512) between the satellite (116, 118) and the gateway (120, 122), and the timestamps of the measurements (506, 514). When a second satellite is available, the present invention determines the range (610) and range rate (610) between the second satellite and the user terminal (124, 126) based on the round trip delay, the Doppler frequency shift between the second satellite and the user terminal (124, 126), and the difference in arrival times (604) at the user terminal (124, 126) of the signals from the satellites (116, 118).
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