Abstract 1. Apparatus for measuring the bearing or elevation of a target displayed on a television screen, comprising a television camera for scanning the area of the target and providing a video signal to a receiver with a cathode ray tube, and, for each bearing or elevation axis, a first saw-tooth generator energised respectively during the synchronisation cycle of the receiver by a synchronising signal, a plurality of selectors comprising triggers successively actuated by a plurality of separate increasing voltages of said saw-tooth signal, a corresponding plurality of slope modifiers each comprising in series an electronic switch and a capacity or a resistance placed in parallel with respect to each other, an integrator R/C incorporating these capacities or resistances and providing a distorted saw-tooth signal, a trip circuit which operates when the voltage of said distorted saw-tooth signal exceeds an adjustable reference voltage and provides a pip signal, a voltmeter measuring said reference voltage, a generator of short pulses of predetermined length energized by said latter trip circuit, and a mixer for adding the video signal and said short pulse and suppling the whole to the T.V. receiver.
Apparatus for measuring the bearing or elevation of a target displayed on a television screen, comprising a television camera for scanning the area of the target and providing a video signal to a receiver with a cathode ray tube, and, for each bearing or elevation axis, a first saw-tooth generator energised respectively during the synchronisation cycle of the receiver by a synchronising signal, a plurality of selectors comprising triggers successively actuated by a plurality of separate increasing voltages of said saw-tooth signal, a corresponding plurality of slope modifiers each comprising in series an electronic switch and a capacity or a resistance placed in parallel with respect to each other, an integrator R/C incorporating these capacities or resistances and providing a distorted saw-tooth signal, a trip circuit which operates when the voltage of said distorted saw-tooth signal exceeds an adjustable reference voltage and provides a pip signal, a voltmeter measuring said reference voltage, a generator of short pulses of predetermined length energized by said latter trip circuit, and a mixer for adding the video signal and said short pulse and suppling the whole to the T.V. receiver.
Claim 2
Dependent Claim
186 words
Apparatus for measuring the bearing or elevation of a target displayed on a television screen, comprising a television camera for scanning the area of the target and providing a video signal to a receiver with a cathode ray tube, and, for each bearing or elevation axis, a first saw-tooth generator energised respectively during the synchronisation cycle of the receiver by a synchronising signal, a plurality of selectors comprising triggers successively actuated by a plurality of separate increasing voltages of said saw-tooth signal, a corresponding plurality of slope modifiers each comprising in series an electronic switch and a capacity or a resistance placed in parallel with respect to each other, an integrator R/C incorporating these capacities or resistances and providing a distorted saw-tooth signal, a trip circuit which operates when the voltage of said distorted saw-tooth signal exceeds an adjustable reference voltage and provides a pip signal, a voltmeter measuring said reference voltage, a generator of short pulses of predetermined length energized by said latter trip circuit, and a mixer for adding the video signal and said short pulse and suppling the whole to the T.V. receiver.
Claim 3
Dependent Claim
24 words
Apparatus according to claim 1, where the voltmeters are graduated respectively in bearing and elevation by comparison with the graduation of an optical marker.