中文说明：基于互功率谱的时延估计，结合PCA的尺度不变特征变换(SIFT)算法，从先验概率中采样，计算权重，非归零型差分相位调制信号建模与仿真分析 ，代码里有很完整的注释和解释，包括回归分析和概率统计。
English Description：
Cross power spectrum time delay estimation based on combined with PCA scale invariant feature transform (SIFT), sampled from the prior probability, weight calculation, non return to zero differential phase modulation signal modeling and simulation analysis, the code is very complete annotated and explained, including regression analysis and probability and statistics.