High resolution variable range gate generator with programmable timing
First Claim
1. In a radar system having a transmitter activated by a trigger pulse and a receiver including range gate generator apparatus for generating a range gate of predetermined width following a controllable time interval after an occurrence of said trigger pulse, said range gate utilized to enable said receiver, said controllable time interval being controllable by a first digital signal, said range gate apparatus comprisingfirst programmable delay line means coupled to receive said trigger pulse and responsive to said first digital signal for propagating said trigger pulse along said first programmable delay line means to delay said trigger pulse in accordance with said first digital signal so as to provide a delayed trigger pulse delayed by said controllable time interval, andrange gate generator means coupled to said first programmable delay line means and responsive to said delayed trigger pulse for generating said range gate upon the occurrence of said delayed trigger pulse.
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Accused Products
Abstract
Range gate delay is effected by serially connected coarse and fine programmable delay lines. The radar transmit trigger pulse is propagated through the programmable delay lines to provide a delayed trigger pulse. The delayed trigger pulse triggers a range gate generator for generating the range gate. The delay effected by the coarse and fine programmable delay lines is controlled from the system CPU. The range gate generator comprises a D-type flip-flop with the Q output thereof connected as the input to a further programmable delay line. The delayed trigger pulse sets the flip-flop and the output of the further programmable delay line resets the flip-flop. The range gate is provided by the Q output of the flip-flop. The width of the range gate is determined by the delay set into the further programmable delay line by the system CPU.
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Citations
7 Claims
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1. In a radar system having a transmitter activated by a trigger pulse and a receiver including range gate generator apparatus for generating a range gate of predetermined width following a controllable time interval after an occurrence of said trigger pulse, said range gate utilized to enable said receiver, said controllable time interval being controllable by a first digital signal, said range gate apparatus comprising
first programmable delay line means coupled to receive said trigger pulse and responsive to said first digital signal for propagating said trigger pulse along said first programmable delay line means to delay said trigger pulse in accordance with said first digital signal so as to provide a delayed trigger pulse delayed by said controllable time interval, and range gate generator means coupled to said first programmable delay line means and responsive to said delayed trigger pulse for generating said range gate upon the occurrence of said delayed trigger pulse.
Specification