POLAR VIDEO GATING OF RADAR AND IFF DISPLAYS USING CARTESIAN CONTROL.
NAVAL RESEARCH LAB WASHINGTON DC
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Many data-processing operations require the rapid and accurate extraction of position data from cathode -ray-tube information sources such as radar, IFF, and sonar PPI repeaters. An IFF Active Readout System under development required gating out IFF video responses at positions controlled by a hook position marker. In this implementation, the hook marker is presented on the PPI in x-y coordinates during the radar repeater recovery or retrace period. A means was devised of developing a video gate control which gates the video with a constant angular width and constant range depth using the x and y dc hook position voltages and the PPI repeater resolved x and y sweep voltages. The computation uses an analog approximation technique which is relatively simple. The approximation deviates from the ideal less than 0.5 for a 10 degree angular width gate. This deviation can be eliminated by the addition of a simple compensation scheme. The video gating method can be implemented digitally for those PPI displays using digital sweeps. Author
- Active and Passive Radar Detection and Equipment