宽带雷达射频分时交替采样增益失配估计方法

摘要

In order to resolve the gain mismatch issue for the Time-Interleaved ADC in wideband radar RF sampling,a gain estimation method based on least square curve fitting is proposed.Based on the gain fluctuation of ADC,the negative influence of gain mismatch on the output signal spectrum was analyzed.According to the characters of wideband DAR echo,the gain estimation curve was obtained.The concrete implementation steps of this estimation method were also presented.Experimental results prove the validity of the proposed method in the wideband TIADC system.%针对分时交替采样在宽带条件下存在增益起伏的失配问题,提出了基于最小二乘曲线拟合的增益曲线估计算法.基于实际ADC器件增益起伏的情况,分析了通道增益失配对系统输出信号频谱的影响；根据宽带数字阵列雷达回波信号的特点,利用分段估计与最小二乘曲线拟合方法得到增益估计曲线,给出了算法的实现步骤.仿真实验结果表明该算法在宽带分时交替采样中的有效性.