| 摘要 |
<p>PURPOSE:To control clutter and display only a point target of an aircraft, etc., by handling a received video signal as a 2-dimensional image and displaying a video signal of the area number of small area on a PPI display apparatus. CONSTITUTION:A received video signal 3 from a radar 1 is applied to a circuit 22 through a binarized circuit 20 as an input and allocated with the area number per each image element. A measuring circuit 24 increases by one of the area number corresponding to the case where the area number signal is other than zero and stores it. A delay circuit 28 delays signal 23, signal issuing pulse signal 2, signal 3, bearing antenna angle signal 4 respectively and sends out correspond ing signals 26, 29, 30, 32. The circuit 24, using the signal 26 as the address, sends out the area of the corresponding area number as a signal 25 and the signal 25 is compared with the reference area in a judging circuit 27, judged for its validity and non-validity and if the judgement is in the affirmative, a displaying video signal 31 is transmitted to the PPI display apparatus 5.</p> |
