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现有的阵列校正算法几乎都没有考虑存在多径效应时的情况,对此提出了一种米波雷达低仰角环境下波达方向估计和阵列通道误差校正的新算法。先对各子阵接收信号做预处理,使通道误差对每个子阵的影响一致,这样阵列旋转因子就与通道误差无关。再对各子阵接收数据进行线性变换和差分处理,利用阵列旋转不变性,实现波达方向估计。最后利用精确求得的波达方向值进行阵列通道误差的校正,算法避免了以往自校正算法联合波达方向和误差矩阵进行最大似然多维寻优的缺点,不但运算量小,还可以有效地克服多径效应。理论分析和计算机仿真都表明了新算法的优越性。
Almost all the existing array calibration algorithms do not consider the case of multi-path effects. A new algorithm of DOA estimation and array channel error correction is proposed in this paper. The pre-processing is performed on the received signals of each sub-array first, so that the influence of the channel errors on each sub-array is the same, so that the array rotation factor has nothing to do with the channel error. Then the received data of each sub-array is linearly transformed and differentiated, and the invariance of array rotation is utilized to realize the DOA estimation. Finally, the error of the array channel is corrected by using the accurately calculated DOA. The algorithm avoids the disadvantage of the maximum likelihood multidimensional optimization of the joint self-correction algorithm and the error matrix in the past, which not only reduces the computation complexity but also effectively Overcome multipath effects. Both theoretical analysis and computer simulation show the superiority of the new algorithm.