Boots – shoes – and leggings
Patent
1988-10-11
1990-04-17
Chin, Gary
Boots, shoes, and leggings
342357, G01S 502
Patent
active
049186094
ABSTRACT:
A satellite-based position-determining system comprises at least two satellites deployed in geosynchronous orbit and equipped with a receiver, transmitter and clock and a user's equipment of unknown position equipped with a clock and a receiver and transmitter for communications with said satellites. At least one satellite and the user's equipment emit range-finding signals based on their own clocks, and each of them receives the other's range-finding signal and measures the time period from the emission of its own range-finding signal to the reception of the other's range-finding signal. Time errors of both clocks are calculated from the above time periods in order to synchronize both the clocks and the position of the user's equipment is determined.
REFERENCES:
patent: 4077005 (1978-02-01), Bishop
patent: 4359733 (1982-11-01), O'Neill
patent: 4652884 (1987-03-01), Starker
patent: 4731613 (1988-03-01), Endo et al.
patent: 4814711 (1989-03-01), Olsen et al.
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