星载傅里叶变换红外光谱仪的脉冲噪声抑制方法

在分析星载傅里叶变换红外光谱仪干涉图的噪声特性后,提出一种抑制脉冲噪声的方法。计算以干涉图的采样点、相对零光程差得到的对称点、两侧采样点后,对得到的插值点建立参照值,通过与阈值比较确定脉冲噪声位置。实验表明,所提方法可以将光谱相对偏差由0.24%抑制到0.17%,将噪声等效辐亮度差由0.069 mW·m^-2·sr^-1·cm抑制到0.056 mW·m^-2·sr^-1·cm。所提方法在抑制脉冲噪声的同时保留了有效光谱信息,提高了星载傅里叶变换红外光谱仪的探测灵敏度。

Method for Suppression of Impulse Noise in Spaceborne Fourier Transform Infrared Spectrometer

In this work, after analyzing the noise characteristics of interferograms from a spaceborne Fourier transform infrared spectrometer, a method for suppressing impulse noise is proposed. After calculating the symmetrical points and the sampling points on both sides of the interferogram obtained by the sampling points and the relative zero optical path difference, the reference values for the interpolation points obtained are established. The impulse noise position is then determined by comparing a threshold with this reference value. Experimental results show that the relative spectral deviation of the proposed method can be suppressed from 0.24% to 0.17%;furthermore, the noise equivalent radiance difference is suppressed from 0.069 to 0.056 mW·m^-2·sr^-1·cm. The proposed method can suppress the impulse noise while retaining the effective spectral information, thereby improving the detection sensitivity of the spaceborne Fourier transform infrared spectrometer.