Radar sensitivity time control using range gated feedback
AssigneeThe United States of America as represented by the Secretary of the Air Force
InventorRobert L. Nevin
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Abstract
A sensitivity time control circuit for radar receivers, using range gated feedback where the video signal is sampled and compared to a desired signal at intervals based upon range sweep; as the radar antenna is reversing direction, integrated averages of the video signal are used to update the sensitivity time controlled waveform.
Claims2
A sensitivity time control for radar receiving having signal processing means including, an input, a signal mixing means, an IF preamplifier and amplifier connected serially to the mixer, a logarithmic detector connected to the amplifier output and a video amplifier for processing the output of the logarithmic detector;
- the improvement comprising:
- means for monitoring and controlling the output of the video amplifier including a summing amplifier connected to the output of the video amplifier for producing a difference voltage;
- a plurality of integrating operational amplifiers connected to said amplifier;
- a plurality of first switches positioned between each integrating operational amplifier and the summing amplifier and a range counting means for sequentially operating said first switches in range related sequence, a plurality of threshold detectors connected to the output of the integrating operational amplifiers through a plurality of second switches operating in range related sequence, and a logic means connected to the output of said threshold detectors and operated in range related sequence and means for processing the output of said logic means for each range sweep whereby high threshold voltages will provide a decreased output and low threshold voltages will increase the voltage output, and means connecting the output of the processing means to the IF preamplifier of the radar receiver.
Dependencies are inferred from the claim text.