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论述了复杂目标回波信号产生衰落的原因。根据它的产生机理,指出了信号衰落现象的特点,信号衰落大都出现在雷达跟踪的远区。最大衰落时间随雷达跟踪距离的增加而增加;衰落深度随距离的减少而降低。文章给出了某连续波制导系统的实测数据,经归纳整理给出了连续波制导系统在不同距离上的飞机回波信号的最大衰落时间和平均衰落时间。给出了某连续波导引头对不同高度和姿态的轰五和歼六飞机的稳定和不稳定的跟踪距离。指出要提高连续波制导系统的作用距离,除了提高回波截获灵敏度之外,还必须要提高跟踪电路对信号衰落的自适应能力。飞机跟踪能力的优劣,能使雷达利用复杂目标的信号起伏规律,使雷达的实际跟踪距离比理论估值提高20～40％。
The reasons for the fading of complex target echo signals are discussed. According to its generation mechanism, the phenomenon of signal fading phenomenon is pointed out. Most of the signal fading appears in the far area of radar tracking. The maximum fading time increases with the radar tracking distance; the fading depth decreases with the decrease of distance. In this paper, the measured data of a continuous-wave guidance system is given. The maximum fading time and average fading time of aircraft echo signals at different distances of continuous-wave guidance system are given. The stability and unstable tracking distance of a continuous wave seeker for H5 and J6 aircraft at different heights and poses are given. It is pointed out that in order to improve the working distance of the continuous wave guidance system, in addition to improving the echo acquisition sensitivity, it is also necessary to improve the tracking circuit’s ability to adapt to signal fading. The advantages and disadvantages of the aircraft tracking capability enable the radar to make use of the signal fluctuation of complex targets so that the actual tracking distance of the radar is increased by 20 to 40% over the theoretical estimation.