宽带数字阵列雷达通道固定时延误差估计技术的研究  

Research on channel-fixed delay error estimation of wideband digital array radar

作　　者：张小贝[1] 张权 方明 秦琨 张琦[1] ZHANG Xiaobei;ZHANG Quan;FANG Ming;QIN Kun;ZHANG Qi(School of Communication and Information Engineering,Shanghai University,Shanghai 200444,China;Shanghai Aerospace Electronic Technology,Shanghai 201109,China)

机构地区：[1]上海大学通信与信息工程学院,上海200444 [2]上海航天电子通讯设备研究所,上海201109

出　　处：《通信学报》2023年第3期24-32,共9页Journal on Communications

基　　金：上海市青年科技英才扬帆计划基金资助项目(No.21YF1417400)。

摘　　要：为解决宽带数字阵列雷达通道固定时延误差导致的数字波束成形性能下降问题,提出一种基于最大似然估计和抛物线插值的通道固定时延误差估计方法。该方法首先通过基带发射信号和包含未知时延参量的基带接收信号的相关积分后信号的峰值点估计通道固定时延整数部分;然后利用峰值点及其相邻两点进行抛物线插值完成通道固定时延小数部分估计;最后计算多通道固定时延误差,并完成各通道固定时延误差的补偿。仿真结果表明,该方法能够在赛灵思的xcku115平台下,实现宽带数字阵列雷达的多通道固定时延误差估计,并且在输入信号信噪比为10~30 dB的情况下,估计精度能够达到0.001~0.014倍采样间隔,可以满足工程的实际应用要求,提高宽带数字阵列雷达中数字波束成形的性能。A channel-fixed delay error estimation method was proposed to tackle the performance degradation of digital beamforming caused by the channel-fixed delay error of wideband digital array radar.First,the integer part of the fixed delay of the channel was estimated through the correlation integral peak of the baseband transmitted signal and the baseband received signal containing unknown delay parameters.Then,the fractional part of the fixed delay of the channel was estimated with parabolic interpolation by using the correlation peak and its adjacent two points.Finally,the multi-channel fixed delay error was calculated and compensated.The simulation results show that the multi-channel fixed delay estimation of wideband digital array radar can be realized on Xilinx xcku115.The estimative precision can reach 0.001~0.014 times the sampling gap when the signal-to-noise ratio of the input signal is 10~30 dB.The proposed method can meet the engineering application requirements and improve the performance of digital beamforming in wideband digital array radar.

关 键 词：数字阵列雷达 通道时延估计 最大似然估计 抛物线插值 

分 类 号：TN967.51[电子电信—信号与信息处理]