此函数用于MIMO雷达的超分辨算法，利用凸优化压缩感知算法进行DOA估计，相比于MUSIC等超分辨算法，该算法的分辨性能更好。(this function is used to DOA estimation of MIMO Radar by the ways of compressive sensing,　and compared to other DOA estimation algorithm, this algorithm can achieve the better performances.)