利用自然梯度算法，基于负熵最大的独立分量分析，实现串口的数据采集，利用贝叶斯原理估计混合logit模型的参数，表示出两帧图像间各个像素点的相对情况，包括调制，解调，信噪比计算。- Use of natural gradient algorithm, Based on negative entropy largest independent component analysis, Achieve serial data acquisition, Bayesian parameter estimation principle mixed logit model, Between two images showing the relative circumstances of each pixel, Includes the modulation, demodulation, signal to noise ratio calculation.