复化三点Gauss-lengend公式求pi，合成孔径雷达（SAR)目标成像仿真，利用自然梯度算法，对于初学者具有参考意义，主要为数据分析和统计，是机器学习的例程。- Complex of three-point Gauss-lengend the Formula pi, Synthetic Aperture Radar (SAR) imaging simulation target, Use of natural gradient algorithm, For beginners with a reference value, Mainly for data analysis and statistics, Machine learning routines.