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本文应用非线性交流载波理论,以某低空战术导弹为例,对红外单通道导引头跟踪回路进行了分析计算。首先给出了跟踪回路的各级交流传递函数的计算方法与结果;进而分析计算了载频通道的非线性负反馈回路,得出了导引头跟踪回路的数学模型,同时论证了跟踪回路中交叉偶合与调制盘扭角的关系,以及跟踪回路中相移对跟踪性能的影响。最后得出这样的结论:在跟踪回路中,当自动增益控制起作用时,该系统对交流载波信号有解耦能力。本文采用的是分析计算方法。这种方法也可应用于圆锥扫描雷达导引头跟踪回路的分析计算。
In this paper, using the theory of nonlinear AC carrier, taking a low-altitude tactical missile as an example, we analyze and calculate the infrared single-channel seeker tracking loop. Firstly, the calculation methods and results of the AC transfer function at all levels of the tracking loop are given. Then the nonlinear negative feedback loop of the carrier frequency channel is analyzed and the mathematical model of the tracking loop of the seeker is derived. At the same time, The relationship between cross-coupling and the angle of modulation disk, and the effect of phase shift on the tracking performance in the tracking loop. Finally, we come to the conclusion that in the tracking loop, when AGC works, the system decouples the AC carrier signal. This article uses the analysis and calculation method. This method can also be applied to the cone-scan radar seeker tracking circuit analysis and calculation.