基于矩孔光学傅里叶变换的匹配滤波器缩放比例标定方法研究  

An approach to measure the scaling factor of matched filter by using rectangle aperture's Fourier frequency spectrum

作　　者：胡文刚[1] 王永仲[1] 华文深[1] 王金玉[1] 沈学举[1] 金阿立[1] 甘厚吉[1] 

机构地区：[1]军械工程学院光学与电子工程系,石家庄050003

出　　处：《光学技术》2008年第1期58-61,共4页Optical Technique

基　　金：中国博士后科学基金资助项目(2005037632)

摘　　要：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 make the Fourier frequency spectrum of target superpose strictly with the matched filter,an approach to measure the scaling factor of matched filter by using rectangle aperture＇s Fourier frequency spectrum is presented.On the base of analysis the Fourier frequency spectrum of scene spatial light modulator in Vander Lugt Correlator,the scaling factor of matched filter is given by using the distance of frequency spectrum of rectangle aperture＇s image. The lens with 400 millimeter focal length is taken as a example,its corresponding scaling factor of matched filter of 1.068 is calculated.The result is verified by experimental comparison of target correlation recognition.Such a conclusion can be made that this approach is wholly suitable for measuring the scaling factor of matched filter to Vander Lugt Correlator.The energy and SNR of correlation peak can be improved efficiently.

关 键 词：信息光学 范德卢格特型相关器 匹配滤波器 缩放比例 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]