To apply polarisation information of radar signal in radar reconnaissance equipment, a joint estimation algorithm of the radar signal direction of arrival (DOA) and polarisation parameters based on dual-polarisation antenna array has been researched in this study. The mathematical model of dual-polarised circular array has been given, and the joint estimation method of DOA and polarisation parameters for radar signal based on multiple signal classification (MUSIC) algorithm has been analysed. To overcome the shortcomings such as high calculation cost for the MUSIC algorithm, the DOA-matrix algorithm has been presented. DOA-matrix algorithm can effectively distinguish the radar signals with different polarisation states in the same direction by use of eigen-decomposition of the DOA-matrix. Through matrix correlation calculation, spectral peak search has been avoided, and the computational cost and algorithm complexity are greatly reduced. Finally, the feasibility of the DOA-matrix algorithm has been simulated and analysed. The simulation results show that the DOA-matrix algorithm can effectively complete the joint estimation of DOA and polarisation parameters for radar signal. The running time reaches millisecond level, which has a strong application value in engineering.

中文翻译：

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基于双极化天线阵的DOA与极化联合估计

为了将雷达信号的极化信息应用于雷达侦察设备中，研究了基于双极化天线阵列的雷达信号到达方向和极化参数联合估计算法。给出了双极化圆阵列的数学模型，分析了基于多信号分类（MUSIC）算法的DOA和极化参数联合估计方法。为了克服MUSIC算法的高计算量等缺点，提出了DOA矩阵算法。利用DOA矩阵的特征分解，DOA矩阵算法可以有效地区分同一方向上具有不同偏振态的雷达信号。通过矩阵相关计算 避免了谱峰搜索，并且大大降低了计算成本和算法复杂度。最后，对DOA-矩阵算法的可行性进行了仿真和分析。仿真结果表明，DOA矩阵算法可以有效完成雷达信号的DOA和极化参数的联合估计。运行时间达到毫秒级，在工程上具有很强的应用价值。