Communications: directive radio wave systems and devices (e.g. – Directive – Position indicating
Patent
1985-04-26
1987-06-02
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Position indicating
342451, 342453, 364451, G01S 302
Patent
active
046707573
ABSTRACT:
A method for passively locating in range and azimuth both active, such as radar, and passive objects. The present invention uses existing direction finding equipment located on a platform, such as an aircraft or ship. At the platform, the invention includes measuring the scan period of the radar, the time of intercept of the main beam of the radar, the angle of arrival of the radar main beam, the time of arrival of a bistatic signal echo from a passive object which has been illuminated by the radar, and the angle of arrival of the echo; calculating the difference between the angle of arrival of the echo and the angle of arrival of the radar main beam to obtain an angle .theta.; determining an angle .phi. subtended by a line drawn from the platform to the passive object; determining the difference T between the time when the radar main beam passes the platform and the time of arrival of the echo; calculating the difference t between the time the bistatic signal travels the distance from the radar to the passive object to the platform and the time radar energy travels from the radar to the platform; and using .theta., .phi., and t to determine each range from the platform to the radar and from the platform to the passive object.
REFERENCES:
patent: 2468269 (1949-04-01), Nelson
patent: 2840813 (1958-06-01), Clark
patent: 3025520 (1962-03-01), Werner et al.
patent: 3581073 (1971-05-01), Visher
patent: 3778602 (1973-12-01), Schmitt
patent: 4179697 (1979-12-01), Golinsky
patent: 4413322 (1983-11-01), Foster et al.
Munich August E.
Schecker Edward J.
Blum Theodore M.
Eaton Corporation
Ranucci V. J.
Rowe D. A.
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