Method of locating persons in distress

Details Method of locating persons in distress Method of locating persons in distress

1976-02-27

1977-04-19

Wilbur, Maynard R.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

340 5H, 343 5CM, 343 18B, G01S 704, G01S 902

Patent

active

040191796

ABSTRACT:
A method for locating any person in distress in a selected area on the surface of the earth who has deployed passive radio frequency (RF) reflectors in a predetermined arrangement. A first transparency is made in the spatial frequency domain of an image of said predetermined arrangement of said RF reflectors. The said selected area of the surface of the earth is scanned by means of a side-looking radar, on board a satellite or aircraft, to produce radar images. Second transparencies in the conventional image domain are produced from the radar images. It is then determined from the first and second transparencies, by means of complex spatial filtering, if RF reflectors in said predetermined arrangement were deployed in said selected area when scanned by said radar.

REFERENCES:
patent: 2463474 (1949-03-01), Busignies
patent: 3457013 (1969-07-01), Henf
patent: 3483513 (1969-12-01), Burckhardt et al.

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