Apparent size passive range method

Television – Special applications – Navigation

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340971, 348140, 348169, H04N 718

Patent

active

053733185

ABSTRACT:
A method and apparatus provides instantaneous passive range measurement oard an aircraft for determining the range between the aircraft and a target. The target may either be stationary or a slower moving vehicle. Calculation of the desired range is achieved using the formula: Range=(S/S')V(Cos a)(Cos b) where "S"=apparent target size; "S'"=rate of change of apparent size; "V"=ground velocity; "a"=azimuth angle from aircraft heading to target; and "b"=elevation angle from the aircraft heading to the target. The apparatus consists of an automatic video tracker, a video camera, and a servo controlled aiming platform. The video tracker provides target size data. Resolvers on the aiming platform are utilized to determine the azimuth and elevation angles from the aircraft axis to the target. The azimuth angle is added to the aircraft drift angle to determine the total azimuth angle from the aircraft heading to the target. The drift angle and ground velocity are obtained from the aircraft inertial system.

REFERENCES:
patent: 3162103 (1964-12-01), Perkins
patent: 3699310 (1972-10-01), Cole
patent: 4983033 (1991-01-01), Suzuki
patent: 5001508 (1991-03-01), Ogawa
patent: 5060004 (1991-10-01), Ikuta
patent: 5177462 (1993-01-01), Kajiwara
patent: 5216480 (1993-06-01), Kaneko

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