| 摘要 |
PURPOSE:To enable a stable tracking regardless of the mixing of any jamming wave by detecting the mixing of a jamming wave through comparison between the target video amplitude value at the center of a tracking gate and those at other positions to control the gate timing according to the results. CONSTITUTION:A gate circuit 8 multiplies a radar echo signal by a tracking gate signal to extract a gated video signal, which is inputted into the subsequent control circuit 20 through an A/D circuit. The control circuit 20 is made up of circuits 10-12 for calculating the area for portions of the gated video signal, a selector 17, a discrimination circuit 6 and the like and has a function of detecting the mixing of jamming waves into the gate signal and a function of detecting discrimination errors separately from the area of the first and second half of the video signal and the area thereof a quarter from the front end thereof at a tracking gate. Without the mixing of jamming waves, the selector 17 selects the former signal. But with the mixing of jamming waves, it selects the latter signal to shift the gate generation timing of a gate generation circuit 7 from the center of the video signal to the position a quarter from the front end thereof. |
