电讯技术2026，Vol.66Issue(8)：1338-1346,9.DOI:10.20079/j.issn.1001-893x.250416002
幅相误差下基于MIMO雷达的相干信号高精度DOA估计
High-precision DOA Estimation of Coherent Signal in MIMO Radar under Amplitude-Phase Errors
摘要
Abstract
The performance of direction of arrival(DOA)estimation for coherent signals in multiple-input multiple-output(MIMO)radar deteriorates under the condition of amplitude-phase errors.An improved Multiple Signal Classification(MUSIC)algorithm based on power adaptive subarray smoothing and iterative optimization of noise subspaces is proposed.This method improves the robustness of the traditional algorithm through a two-stage optimization strategy.Firstly,a power adaptive subarray smoothing mechanism is designed to dynamically weight the covariance matrix according to the signal strength of subarrays to suppress the energy mismatch between subarrays caused by amplitude-phase errors.Secondly,the iterative optimization algorithm of noise subspace projection matrix is introduced,and the random error compensation technology is used to correct the noise space distortion to reduce the interference of error on the orthogonality criterion.Finally,the new noise subspace is obtained by eigen-decomposition of the optimized projection matrix,and the DOA estimation is realized by combining the MUSIC algorithm.The simulation results show that,compared with the traditional algorithm,the proposed algorithm can reduce the root mean square error(RMSE)of DOA estimation by 25%and improve the success rate of coherent signal resolution by 30%in typical amplitude-phase error scenarios.关键词
MIMO雷达/DOA估计/幅相误差/加权重构/投影矩阵Key words
MIMO radar/DOA estimation/amplitude-phase error/weighted reconstruction/projection matrix分类
信息技术与安全科学引用本文复制引用
蓝晓宇,周海龙,梁明珅..幅相误差下基于MIMO雷达的相干信号高精度DOA估计[J].电讯技术,2026,66(8):1338-1346,9.基金项目
国家青年科学基金(61801308) （61801308）
航空科学基金(2020Z017054001) （2020Z017054001）
辽宁省教育厅面上项目(LJKMZ20220535) （LJKMZ20220535）
辽宁省自然科学基金计划(2024-MS-135) （2024-MS-135）
辽宁省教育厅特色学科计划提升项目(LJ212410143102) （LJ212410143102）
