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在分析软硬阈值去噪特点的基础上，提出一种改进的小波阈值函数。根据Langmuir探针I-V特性曲线的特点，提出一种改进的标准差估算方法来计算小波阈值。采用基于改进标准差和改进阈值函数的小波对探针特性曲线进行去噪，仿真结果表明，改进的方法取得了良好的去噪效果，提高了信号的信噪比，降低了均方误差，去噪效果优于传统阈值去噪方法。

Data processing of Langmuir probe based on improved wavelet denoising method

An improved threshold function is proposed with the characteristics analysis of soft and hard threshold denoising methods. Based on the characteristics ofI-V curve of Langmuir probe, an improved standard deviation estimating method is introduced to calculate the wavelet threshold. Denoisng the characteristic curve with improved threshold function and threshold, and the simulation results show that, the improved denoising method preformed well, the signal noise ratio is improved and the root mean square error is reduced. The denosing effectiveness is better than traditional threshold method.