Communications: directive radio wave systems and devices (e.g. – Directive – Position indicating
Patent
1981-08-06
1993-03-02
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Position indicating
342387, G01S 302
Patent
active
051913429
ABSTRACT:
An apparatus determines the location of a signal source having coordinates x,y). The source may be located as far away as two thousand km and does not require knowledge of ionospheric height or layer structure. The apparatus comprises at least three receivers adapted to receive the signals from the signal source. The coordinates, (x.sub.1,y.sub.1), (x.sub.2,y.sub.2) and (x.sub.3,y.sub.3), of each of the receivers are very precisely known. One receiver is capable of receiving signals from the other two receivers through different means (e.g. a wide-band telephone link). A plurality of at least three timers, one connected to each receiver, measures precisely the time difference of arrival (TDOA) of the signals from the signal source. A plurality of at least three means, connected one to each of the receiving means, determine the vertical angles .phi. at which the signal from the signal source is received by each of the receivers. More precisely, each receiver is in reality a phased array of individual antenna elements whose joint output can be used to measure both vertical angle and azimuth. Means are provided for calculating the coordinates (x,y) of the signal source from the measured vertical angles and the time differences of arrival.
REFERENCES:
patent: 3445847 (1960-05-01), Hammack
patent: 3889266 (1975-06-01), Bartram
patent: 4215345 (1980-07-01), MacDoran
Alsup James M.
Jelks Edward C.
Blum Theodore M.
Fendelman Harvey
Keough Thomas Glenn
Stan John
The United States of America as represented by the Secretary of
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