中文说明：
对二维矩形阵列，进行空间谱估计！适合阵列测向的新手，建议先仔细学习基础知识。在知识积累上想进行垮越式发展，于初学者来说最重要的是能帮助你弄清楚问题根本何在。
English Description：
For two-dimensional rectangular array, spatial spectrum estimation! Suitable for novices of array DF, it is recommended to carefully learn the basic knowledge first. In terms of knowledge accumulation, the most important thing for beginners is to help you find out the root of the problem