频率分集MIMO雷达信号优化设计

针对集中式多输入多输出(multiple input multiple output, MIMO)雷达扩展目标检测识别问题，提出将多频阵列(multiple frequency array, MFA)应用到集中式MIMO雷达中来实现频率分集，增加自由度，在频域基于互信息量(mutual information, MI)优化不同频带天线上的功率分配以设计信号，针对目标依据雷达功率分配情况施放干扰以避免检测识别的情况，雷达在杂波及干扰环境下再次优化信号功率分配，实现雷达认知功能。仿真结果证明，优化信号可综合噪声、杂波及干扰统计特性重新调整功率分配，可提高目标频域响应和目标回波间互信息量，为改善目标检测识别性能奠定基础。 

Optimal signal design for frequency diversity MIMO radar

The method to solve the problem of co-located multiple input multiple output (MIMO) radar optimal signal design for extended target detection and identification is proposed. To realize frequency diversity and increase degrees of freedom, it applies multiple frequency array (MFA) to co-located MIMO radar for performance enhancement. And it is based on mutual information (MI) in the frequency domain by means of optimizing power distribution on different frequency antenna to design radar signal for cognitive function. Radar optimizes signal power allocation again in the presence of clutter and interference, where the interference is released by target on the basis of radar power allocation to avoid detection and identification. Simulation results indicate that the optimized signal can adjust distribution of power again according to statistical characteristic of noise, clutter and interference, improve mutual information between target frequency response and target echo, and lay the foundation for performance improvement of target detection and identification.