激光引信在云雾背景环境中探测目标时，探测器会接收到与目标反射回波功率相当或较大的云雾后向散射回波，回波信号信噪比低，传统的相关检测法不能实时有效提取目标信息。针对这一问题，提出滑动窗变系数相关检测法。该方法在互相关检测原理的基础上，采用发射信号作为滑动窗模板，匹配被变系数修正后探测信号。通过设定相关系数的阈值，该方法可以利用云雾回波和目标反射回波与模板信号不同的相关性来检测目标信息。仿真结果表明，一定量样本运算后，得到引信系统合适的相关系数阈值，大量样本运算验证该阈值，算法成功率大于92.4%。%When laser fuze detects targets under clouds and fog background,the backscattering echo power of the clouds,which is received by the detector,is approximately equal to or even larger than the echo power of the target,i.e.,low SNR of the echo.The traditional correlation detection method can not extract such target in-formation effectively in real time.Concerning this issue,based on the theory of cross-correlation detection,a method of detecting the echo pulses of laser fuse by using the variable coefficient correlationwas proposed.By this method,the shape of the emission signal was used as a sliding window template,which matched the varia-ble-coefficient corrected signal.The threshold of the correlation coefficients was fixed throughout the experi-ment.By making use the difference between the template signal-clouds echo correlation coefficient and template signal-target echo correlation coefficient,the target information could be obtained accordingly.In our simula-tion,a proper threshold of the correlation coefficients was obtained by a certain number of sample calculations. Applying this threshold to a larger group of sample,the success probability of this method was over 92.4%.
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