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在雷达寻的导弹飞行的最后阶段,如果它所收到的目标信号的多普勒频率落入主瓣杂波谱内的话,则会引起很大的脱靶量。本文采用SAMS(StatisticAssessment of Missile System)程序对这种杂波影响做了定量的分析。SAMS程序是一个多层次的、更具有普遍性的SLAM(Statistical LinearizationAdjoint Method)法的改型。在此程序中,寻的导弹用三个时间常数,一个限幅器,一个二阶导弹弹体,以及一个比例导航环节来表征。主瓣杂波与目标随机机动、起伏、衰落和接收机噪声一起加在这个系统里。通过对系统方程和伴随系统的协方差传播处理,便可算出总脱靶量及各部分噪声的影响。结果表明,如果在导弹飞行的最后2秒钟,目标多普勒频率开始穿越主瓣杂波谱,则杂波的影响为最大。如果再加上目标的随机机动,则杂波对脱靶量的影响将急剧增大。但是,如果导弹的侧向加速能力增加,或者目标的侧向加速能力减小的话,那么这些影响将会减小。本文还在原系统上增加了有关的前馈回路,用以分析导弹整流罩的影响,整流罩对于脱靶量的影响还是相当大的。
In the final phase of radar-guided missile flight, a large off-miss can be caused if the Doppler frequency of the target signal it receives falls within the main lobe spectrum. This paper uses the SAMS (Statistic Assessment of Missile System) program to do a quantitative analysis of this clutter effect. The SAMS program is a multi-level, more generalized variant of the SLAM (Statistical Linearization Adjoint Method). In this program, the missiles to be sought are characterized by three time constants, a limiter, a second-order missile body, and a proportional navigation. The main lobe clutter is added to the system along with the random motions, fluctuations, fading, and receiver noise of the target. Through the covariance propagation processing of the system equations and the accompanying system, the impact of the total miss distance and each part of the noise can be calculated. The results show that if the target Doppler frequency begins to cross the mainlobe clutter spectrum during the last two seconds of the missile’s flight, the clutter effect is greatest. If coupled with the target’s random maneuver, the impact of clutter on miss distance will increase sharply. However, these effects will decrease if the lateral acceleration capability of the missile increases or the lateral acceleration capability of the target decreases. This article also adds the relevant feedforward loop to the original system to analyze the influence of the missile cowling, and the influence of the cowling on the miss distance is still quite large.