低频检波器频谱补偿算法建模及仿真

采用数值仿真的方法建立了动圈式检波器的仿真模型,推导检波器传递函数,通过对实际动圈式检波器频率特性的测试,验证了动圈式检波器数值仿真模型的正确性,分析动圈检波器频率响应特性,分别对动圈式检波器的自然频率、灵敏度、阻尼比进行仿真,对不同自然频率、灵敏度、阻尼比对检波器输出频率特性的影响进行了分析,使用二阶二次型反馈补偿方法,设计检波器低频补偿结构,结果表明:数值仿真模型与实际检波器的频率响应一致,补偿结构使检波器自然频率由2 Hz降低至0.2 Hz.

Modeling and simulation of frequency spectrum compensation algorithm for the low frequency detector

A numerical simulation model for the moving-coil detector was established. On this basis, the transfer function of the detector was derived, its frequency response characteristics were analyzed, natural frequency, and sensitivity and damping ratio of the moving-coil detector were simulated, respectively. The influence of the detector output frequency characteristics was investigated. The low frequency compensation structure was designed by the second-order quadratic feedback compensation method. The frequency characteristics test the of moving-coil detector with natural frequency of 2 Hz verified the correctness of the numerical simulation model. The results show that this model is consistent with the actual frequency response of the detector, and detector's natural frequency is reduced to 0.2 Hz from 2 Hz by using the compensation structure.