Aeronautics and astronautics – Missile stabilization or trajectory control – Automatic guidance
Patent
1978-05-17
1980-11-18
Jordan, Charles T.
Aeronautics and astronautics
Missile stabilization or trajectory control
Automatic guidance
250203R, F41G 700
Patent
active
042341450
ABSTRACT:
Four radiant energy detectors are arranged in a common plane in a substantially square configuration with each detector occupying a separate quadrant. Infra-red energy received from a target is focused onto the detectors by means of a lens, there being a chopper positioned between the lens and the detectors to chop the radiant energy in a periodic fashion. The outputs of diagonally opposite pairs of detectors are each directly fed to a separate differencing amplifier, where difference signals are generated. These difference signals are then added together and subtracted from each other in separate circuits in a predetermined manner to produce a first signal representing the departure in azimuth of the target from a reference axis running through the center of the detector array, and a second signal representing the departure in elevation of the target from this same axis. The azimuth and elevation signals are separately phase detected in phase detectors which are referenced to the chopper drive signal, the outputs of the phase detectors being filtered in low pass filters to produce DC signals representing the departure in azimuth and elevation of the target from the reference axis. These signals can be fed to an indicator or employed to drive a servo system which slews the support structure for the detectors so as to lock the detectors onto the target.
REFERENCES:
patent: 2969018 (1961-01-01), Erst et al.
patent: 3128061 (1964-04-01), Chew
patent: 3514608 (1970-05-01), Whetter
patent: 3657547 (1972-04-01), Mansfield
patent: 3744740 (1973-07-01), Godin et al.
patent: 4006356 (1977-02-01), Johnson et al.
patent: 4021007 (1977-05-01), Coxe
Jordan Charles T.
Northrop Corporation
Sokolski Edward A.
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