knn算法，用于室内定位，原理是计算信号点的欧几里得距离进行划分区域，锁定范围。本代码可通过改变k值和ap的数量进行调整，但对最终仿真结果形象不大。是一种用于室内定位阶段的最基础的方法。-knn algorithm for indoor positioning, the principle is to calculate the signal point Euclidean distance divided area, locking range. The code can be adjuste

Several new methods sar image denoising, It draws on principal component analysis algorithm (PCA), Least-squares algorithm to fit a three-dimensional plane.