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为了使待识别目标的傅里叶变换频谱与匹配滤波器频谱分布严格重合,提出了一种基于矩孔图像光学傅里叶变换的匹配滤波器缩放比例标定方法。针对范德卢格特型光学相关器,在分析场景空间光调制器傅里叶变换频谱分布的基础上,以矩孔图像的频谱间距作为基准标定匹配滤波器的缩放比例;并利用焦距为400mm的傅里叶透镜作为一个实例,计算出其匹配滤波器缩放比例为1.068,对标定结果进行了实验验证。结果表明,此方法适用于范德卢格特型光学相关器中匹配滤波器的缩放比例标定,能够有效提高相关峰的能量和信噪比。
In order to strictly match the spectrum of the Fourier transform spectrum of the target to be matched with that of the matched filter, a scaling method of the matched filter based on the rectangular aperture optical Fourier transform is proposed. Based on the analysis of the spectrum distribution of the scene spatial light modulator Fourier transform and the spectrum pitch of the rectangular aperture image, the scaling ratio of the matched filter is calibrated for the Vandewegg-type optical correlator. With the focal length of 400mm As an example, the matching filter scaling factor was calculated to be 1.068, and the calibration results were verified experimentally. The results show that this method is suitable for the scale scaling of matched filters in the Vanderwitg type optical correlator, which can effectively improve the energy and signal-to-noise ratio of the correlation peak.