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SIAR雷达采用多载频正交发射、多天线接收模型,通过频率分集处理,其接收回波经过变换等效为非均匀空域采样信号,常规傅里叶变换处理得到的目标谱分析会出现较大的旁瓣效应,文中先对接收天线位置进行预排序处理,之后通过贝叶斯后验概率分布准则,采用l2范数对目标功率谱进行加权约束,进而获得空间均匀采样阵列回波.仿真试验给出了目标在不同SNR、不同外推阵列个数及不同仰角下的谱分析,仿真结果有效验证了SIAR雷达在高分辨角度测量等方面的优势.
SIAR radar adopts multi-carrier orthogonal transmission and multi-antenna reception model. After frequency diversity processing, the received echo is equivalent to the non-uniform spatial domain sampled signal, and the target spectrum analysis obtained by the conventional Fourier transform process will be larger The sidelobe effect is preprocessed, and then the position of the receiving antenna is pre-sorted. Then the Bayesian posterior probability distribution criterion is adopted to weight the target power spectrum with l2 norm, and then the spatial uniform sampling array echo is obtained. The spectral analysis of target with different SNRs, different numbers of extrapolated arrays and different elevation angles is given. The simulation results validate the advantages of SIAR radar in high resolution angle measurement effectively.