Radar trigger and pretrigger generator having delay sensing and compensating circuit
First Claim
1. An apparatus for providing a trigger pulse to a circuit and a pretrigger pulse with a preselected time delay between the pretrigger pulse and the responsive signal output from the circuit comprising:
- means for providing reference pulses,means coupled to trigger input means of said circuit and responsive to said reference pulses for generating said trigger pulses after a preselected time delay from said reference pulses,means coupled to said trigger input means to receive said trigger pulses and to output means of said circuit to receive output signals therefrom for measuring time delays between said trigger pulses and said output signals and for providing signals representative of said measured time delays, andmeans coupled to receive said time delay representative signals and said reference pulses for providing pretrigger pulses at a time after receipt of said reference pulses that is equal to said measured time delay.
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Accused Products
Abstract
The radar trigger and pretrigger generator determines the inherent component time delay through the radar modulator and transmitter during a first cycle of operation. During the next cycle of operation a pretrigger pulse is generated after a time corresponding to the previously measured delay and a trigger pulse is generated after a time corresponding to an operator selectable delay. The trigger pulse is used to trigger the radar modulator, which in effect, permits the operator to control the elapsed time between pretrigger pulse and transmitter firing in a fashion which is completely independent of circuit delay variances through the radar modulator and transmitter.
8 Citations
12 Claims
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1. An apparatus for providing a trigger pulse to a circuit and a pretrigger pulse with a preselected time delay between the pretrigger pulse and the responsive signal output from the circuit comprising:
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means for providing reference pulses, means coupled to trigger input means of said circuit and responsive to said reference pulses for generating said trigger pulses after a preselected time delay from said reference pulses, means coupled to said trigger input means to receive said trigger pulses and to output means of said circuit to receive output signals therefrom for measuring time delays between said trigger pulses and said output signals and for providing signals representative of said measured time delays, and means coupled to receive said time delay representative signals and said reference pulses for providing pretrigger pulses at a time after receipt of said reference pulses that is equal to said measured time delay. - View Dependent Claims (2, 3, 4, 5, 6)
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7. Apparatus for triggering a modulator of a RF transmitter to emit transmitter trigger pulses and for providing pretrigger pulses at preselected times therebefore comprising:
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means for providing reference pulses, means coupled to trigger input means of said modulator and responsive to said reference pules for providing trigger pulses to said modulator after a preselected time delay from said reference pulses, means coupled to said trigger input means to receive said trigger pulses and to output means of said modulator to receive said transmitter trigger pulses for measuring time delays between said trigger pulses and said transmitter trigger pulses and for providing signals representative thereof, and means responsive to said time delay representative signals and said reference pulses for generating pretrigger pulses at a time after receipt of said reference pulses that is equal to said measured time delay. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification