Radio determination using satellites transmitting timing signals

Details Radio determination using satellites transmitting timing signals Radio determination using satellites transmitting timing signals

1977-10-17

1979-07-17

Wilbur, Maynard R.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343103, 343100ST, 343112R, G01S 512

Patent

active

041617304

ABSTRACT:
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.

REFERENCES:
patent: 3384891 (1968-05-01), Anderson
patent: 3430234 (1969-02-01), Wright
patent: 3705404 (1972-12-01), Chisholm

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