空间外差光谱技术是一种新型的超分辨光谱技术，介绍了空间外差光谱仪的基本原理，由于光学系统的加工误差造成双光路的非对称性致使二维干涉条纹的倾斜及扭曲失真。针对二维干涉图的误差特点提出了基于频域分析的干涉图校正方法，通过多单色光光源定标获取二维干涉图快速傅里叶变换(FFT)频域的信号校正坐标并拟合校正曲线，校正曲线最终可用于该空间外差光谱仪干涉图的校正。以单色光光源、高斯型连续光谱光源的实验数据对校正方法进行验证。结果证明，采用该方法对空间外差光谱仪干涉图进行处理，能有效地去除系统非对称性影响，校正二维干涉图信号，提高干涉图反演光谱的精度。

Spatial heterodyne spectroscopy (SHS) is a new spectroscopic technique which can achieve high spectral resolution. The basic concepts of spatial heterodyne spectrometer are described. The two-dimensional (2D) interference fringe distortion is due to asymmetry of double optical path, which caused by the errors from optical systems of the interferometer. According to the characteristics of SHS interference fringe distortions, a SHS interferogram correction method based on frequency domain analysis is presented. The corrected coordinate of fast Fourier transform (FFT) frequency domain signal obtained from monochromatic source calibration. Then the calibration curve fitting from corrected coordinate can be used for correction of SHS interferogram. Spectral experiments are operated on the SHS instrument by monochromatic source and Gaussian continuous spectrum source. The experimental results show that the correction method can effectively remove interference of system asymmetry, correct 2D SHS interferogram and improve spectral inversion accuracy of spatial heterodyne spectrometer.