Fast user terminal position determination in a satellite communications systems

申请公布号：AU6029999(A)

申请号：AU19990060299

申请日期：1999.09.08

申请公布日期：2000.03.27

申请人：

QUALCOMM INCORPORATED

发明人：JIN DAI

分类号：G01S5/12;G01S5/14;G01S19/25

主分类号：G01S5/12

摘要：An apparatus, method, and process for quickly and accurately determining the position of a user terminal (124,126) in a satellite communications system (100). An initial coarse estimate of the radius of the Earth at a terminal position is made (302,402). The geometry of satellites being used (116,118) and the user terminal (124,126) is then determined. Two satellites are used, the satellite-user terminal geometry includes the range (406,408) of each satellite (116,118) with respect to the user terminal (124,126). An initial position estimate is determined based on the radius and the satellite-user terminal geometry. The coarse radius estimate (304,404) can then be formed into a fine estimate (310,412) and the initial position estimate further refined.

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