基于松弛交替投影的MIMO雷达相位编码波形设计

任务场景日趋复杂给MIMO（Mutiple-Input Mutiple-Output）雷达带来诸多挑战。为应对强散射体遮蔽干扰、阵元间波形互扰及特定频带干扰等复杂电磁环境，该文提出一种松弛迭代谱拟合交替投影算法来设计相位编码波形。该算法基于功率谱拟合及交替投影框架，并引入扩展的加速因子；首先，凭借功率谱与非周期相关函数的傅里叶变换关系，将相关特性拟合问题转化为功率谱近似问题；然后，构建理想波形频谱并利用松弛机制扩展优化投影区；最后，利用快速傅里叶变换及加速交替投影机制迭代优化。计算机仿真表明，该算法运算效率高、可有效避免局部停滞，与当前流行算法相比更适合在线波形设计。

Phase-Coded Waveform Design via ReIaxed AIternating Projection for MIMO Radar

The sophisticated scenarios always challenge MIMO(Mutiple-Input Mlitiple-Output)radar.A relaxed iter-ative spectrum approximation alternating projection method (RISAAP)is proposed to design phase-coded waveforms,for suppressing high range sidelobes of strong scatters,electromagnetic interference in specified frequencies and cross-interfer-ence from different signals.This method is based on power spectral density (PSD)approximation and alternating projection with extended accelerating factor.Firstly,the correlation fitting is transformed into PSD approximation via FFT between the aperiodic correlation function and PSD.Secondly,the desired spectrum constraint is formulated and the projection space is expanded by its relaxed mechanism.Finally,the iterative optimization is conducted via FFT and accelerated alternating pro-jection.Simulations demonstrate that this method could obtain efficient performance and avoid local stagnation which seems more convenient for waveform design on-the-fly than some prevalent algorithms.