04161730 is referenced by 50 patents and cites 3 patents.

The time-of-arrival of timing signals transmitted by two satellites is measured relative to a crystal clock, and an approximate position fix is computed for the ship or other object being located. Because of clock error the position fixes are displaced along a hyperbolic line of position. A two-way active range measurement through a third satellite or one timing signal satellite enables computation of an independently determined line of position, the true position fix being at its intersection with the hyperbolic line of position. The clock error is corrected and the method of position fixing from two timing satellites is repeated until the clock drift exceeds acceptable limits. A continuous navigation service and also position surveillance are realized.

Title
Radio determination using satellites transmitting timing signals with correction by active range measurement
Application Number
5/842402
Publication Number
4161730
Application Date
October 17, 1977
Publication Date
July 17, 1979
Inventor
Roy E Anderson
Schenectady
NY, US
Agent
Marvin Snyder
Joseph T Cohen
Donald R Campbell
Assignee
General Electric Company
NY, US
IPC
G01S 5/12
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