改进的通道特性校准方法在干涉仪中的应用

Application in Angle Measurement of Improving Channel Characteristic Calibration

多通道测角系统中，通道幅相特性是影响测角精度的重要因素。提出一种不失一般性的自适应滤波器校准模型，分析了滤波器暂态效应对测角结果带来的影响，指出暂态效应的持续时间与滤波器的阶数有关。并对此提出改进，改进后的方法根据滤波器阶数进行野值点剔除，修正了暂态效应对测角结果的影响。仿真验证在样本数较少，信噪比为10 dB的情况下时，角度估计精度可以提升0.1°~0.3°。

In the system of muti-channel direction finding,the characteristic of channels is a critical factor in the angle measurement. The common calibrated model of self-adaptive filter is proposed in this paper,and the error influence which cases by digital filter’s transient response is analyzed,even through the duration of digital filter’s transient response is pointed out is related to filter order. According to this,the improve method is proposed in this paper,the method gave up error points based on filter order,released the effluence of angle measurement. The simulation validate the efficiency of this method in the small sample condition,for the SNR is 10 dB,the angle improvement can be reach 0.1~0.3.