位敏探测器（PSD）技术作为光电技术的重要组成部分，在各学科领域得到广泛应用。随着对PSD系统信号精度的要求越来越高，要求研究出更好的去噪效果的方法。针对PSD系统信号的特性，选择db8、sym8、coif8对含噪的信号进行处理和对比，并通过MATLAB中的小波GUI软件进行数字仿真，并对仿真结果进行比较，从而得出最适合的小波处理方法。通过仿真结果分析表明，小波分析方法可以达到较好的去噪和滤波效果。

As an important part of the electro-optic technology, the PSD (position sensitive detector) technology is widely applied in various subject fields. The precision damand for PSD system signal is becoming more and more strict. It requests a better method to reduce the noise of PSD system signal. In view of the PSD system signal characteristic, the db8, sym8, coif8 are choosed to process and compare with the signal which contains chirp. And the simulation is done by the wavelet GUI in the MATLAB software. In order to obtain the most suitable wavelet processing method, the simulation resuls are compared. The simulation results indicate that the algorithm can provide a better way for filtering and de-noising.