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本文在简要回顾雷达自频控(AFC)系统工作特性和分析方法的基础上,讨论了AFC系统的几种可能的错误控制问题,包括:(1)鉴频特性极性不正确和本振调错引起的错控;(2)本振频率搜索过宽引起的错控;(3)谐波混频引起的错控;(4)中放非线性引起的错控;(5)脉冲状态时鉴频零点的多值性引起的错控;(6)门限电压过低和增益过大引起的错控等问题。其中后面几个问题是作者结合工作体会,分析了某些国产雷达AFC系统中存在的一些问题后进行讨论的。在此基础上对AFC系统调整中的所谓“错抓”和“闷死”等现象提出了看法,并提出为避免错控在AFC系统的设计和调整、测试中应注意的一些问题。
Based on a brief review of the working characteristics and analysis methods of AFC system, this paper discusses several possible error control problems of AFC system, including: (1) the polarity of frequency discrimination is not correct and local oscillator (2) Misdiagnosis caused by over-hunting of the local oscillator frequency; (3) Incorrect control due to harmonic mixing; (4) Incorrect control caused by non-linearity in the input; (5) False control caused by the false value zero frequency; (6) the threshold voltage is too low and the gain is too large caused the wrong control and other issues. The latter few questions are the author's work experience combined with the analysis of some of the problems in the domestic AFC system AFC system for discussion. On the basis of this, some suggestions on the so-called “wrong grasping” and “suffocation” in AFC system adjustment are put forward, and some problems that should be paid attention to in the design, adjustment and testing of AFC system are put forward.