05412388 is referenced by 77 patents and cites 6 patents.

A radio telecommunications system includes a number of locator satellites in low earth orbits. Locatable subscriber units communicate with the satellites. A single subscriber unit communicates with a single satellite using electromagnetic signals so that a measurement processor can obtain Doppler component, propagation duration, and real time measurements of the signals. A location processor converts these measurements into a two-position location solution. The two-position solution includes an actual position and an image position. The actual position may be detected in some situations by identifying a cell within which communications take place. In other situations, the actual position may be distinguished from the image position by detecting the eastward rotation of the earth. A service processor determines which qualifications to apply to communication services offered by the system. These qualifications are based on the subscriber unit's location.

Title
Position ambiguity resolution
Application Number
8/105235
Publication Number
5412388
Application Date
August 11, 1993
Publication Date
May 2, 1995
Inventor
Stanley W Attwood
Sun Lakes
AZ, US
Agent
Kevin K Johanson
Phillip E Hall
Robert M Handy
Assignee
Motorola
IL, US
IPC
G01C 21/00
G01S 5/02
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