System for determining the location of an airborne vehicle to th

Details System for determining the location of an airborne vehicle to th System for determining the location of an airborne vehicle to th

1980-03-31

1983-05-31

Tubbesing, T. H.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 5MM, 343100ST, G01S 510

Patent

active

043863558

ABSTRACT:
A satellite in geosynchronous orbit includes a source of signal illumination which is directed toward the earth, covering a given area thereof. An airborne vehicle, such as a missile, traveling over the area covered by the signal illumination from the satellite, includes a first antenna for receiving an incident set of signals from the satellite directly, and a second antenna for receiving the same signals from the satellite after they have been reflected from the earth's surface, referred to as a reflected set of signals. The altitude of the airborne vehicle may be ascertained by comparing the relative times at which the two sets of signals are received at the airborne vehicle, while the remaining location information, referred to as ground map information, may be ascertained by first determining range and angle data from the reflected signals and then comparing that data with ground map data stored aboard the airborne vehicle.

REFERENCES:
patent: 2837738 (1958-06-01), Van Valkenburgh
patent: 3171126 (1965-02-01), Wiley
patent: 3242490 (1966-03-01), Wentworth et al.
patent: 3721986 (1973-03-01), Kramer
patent: 3856237 (1974-12-01), Torian et al.
patent: 3863257 (1975-01-01), Kang et al.
patent: 3939476 (1976-02-01), Leopard et al.

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