Radio determination using satellites transmitting timing...

Details Radio determination using satellites transmitting timing... Radio determination using satellites transmitting timing...

G - Physics

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G01S 5/00 (2006.01) G01S 5/12 (2006.01) G01S 11/08 (2006.01) G01S 13/76 (2006.01) G01S 13/86 (2006.01)

Patent

CA 1115394

RADIO DETERMINATION USING SATELLITES TRANSMITTING TIMING SIGNALS WITH CORRECTION BY ACTIVE RANGE MEASUREMENT Abstract of the Disclosure The time-of-arrival of timing signals transmitted by two satellites ismeasured relative to a crystal clock, and a approximate position fix is computedfor the ship or other object being located. Because of clock error the positionfixes are displaced along a hyperbolic line of position. A two-way active rangemeasurement 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.

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