数字化干涉仪测角技术

摘要

As compared with traditional analog phase discrimination technology,digital direction finding system of digital interferometer employs high precise digital phase discrimination technology and could thus raise greatly the precision of phase discrimination and satisfy the need of high precise direction finding of interferometer.Based on analysis of phase detection algorithm,this paper used two quadrature LO cross multiply two input signals,and used CIC filter to remove high frequency signal.Processing of atan function based on CORDIC algorithm.Experiment on interferometer angle measurement simulator shows that the error of phase detection is no more than 0.2°.%数字化干涉仪测角采用的是高精度数字鉴相技术,该技术与传统的模拟鉴相技术相比可以大幅度提高鉴相精度,从而满足高精度干涉仪测角的要求.基于数字干涉仪鉴相算法,通过两路正交本振信号分别与两路待测相信号相乘,使用CIC滤波器除乘积中的高频信号,最后通过CORDIC算法计算出相位差.经过干涉仪测角模拟器上测试结果表明,其数字鉴相误差小于0.2°.