DMTI雷达正交鉴相器的数字校正方法

The Digital Correction Method of Orthogonal Detector in DMTI Radar

以DMTI雷达为例 ,给出了相位不平衡和增益不平衡的校正方法。根据理论分析在计算机上用MAT LAB进行了Monte Carlo模拟并得出相关结论。实验表明 ,当鉴相器输入信噪比大于 4 0dB时 ,对幅度不平衡为10 % ,相位不平衡为 5°的模拟输入数据进行校正后 ,可验证此校正单元两输出信号的幅度不平衡小于 1% ,相位不平衡小于 0 .2°。

A theoretical analysis of the simplified correction method of phase and amplitude errors in the orthogonal detector of a DMTI radar is made,and the Monte-Carlo simulation results on the MATLAB software are given.From the simulation test,it is shown that when the input SNR of the orthogonal detector is greater than 40dB,and the amplitude error of the I/Q double-channel simulated imput signals is 10% and the phase error is 5°,the phase error of the I/Qdouble-Channel output isgnals of the corrector is less than 0.2°and the amplitude error is less than 1%.