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国产“警-17”雷达是一种装备在高炮部队的中远程警戒雷达。在它的发射脉冲的探测回波中,不仅存在飞行目标的信号,还有静止的高大物体反射回波,以及高频“毛草”噪声。后两者是影响正确识别飞行目标的噪声。如果在计算机内存中建立这样一种电子图象,回波的幅度高于某一门限,则认为是逻辑电平“1”;低于这个门限,则认为是电平“0”。雷达在一周扫描完毕后就会构成一幅电子图象:
Domestic “police -17” radar is a long-range warning radar equipped with anti-aircraft units. In its launch pulse, the detected echoes include not only the signal of the flying target, but also the stationary echo of the tall object and the high frequency “mahogany” noise. The latter two are the noise that affects the correct identification of the flying target. If such an electronic image is created in the computer memory and the amplitude of the echo is above a certain threshold, a logical level “1” is considered; below which a level of “0” is considered. Radar in the week after the scan will form an electronic image: