激光窃听技术通常不直接照射被窃听目标,且由于玻璃散射的原因,利用现有的拦截式激光预警技术无法获取其窃听源方位等信息,针对该问题,提出利用CCD相机结合滤光片的方案对窗户进行凝视成像的反激光窃听预警系统,同时,构建了窃听激光源、被照射玻璃上的散射激光光斑以及反激光窃听系统之间的空间几何模型,结合边缘检测等图像特征提取算法以及最小二乘图像拟合算法对散射激光光斑轮廓进行拟合,推导出窃听激光光源来袭方位的数学模型。实验结果表明：所搭建的激光窃听预警系统不但可以检测到照射到玻璃上的窃听光斑,且可以有效地追溯到该激光束的方位角和俯仰角信息,定位精度≤4°,从而达到了对窃听源定位的目的,有助于推动现有激光预警技术的进一步发展,且在**安全等领域发挥积极作用。

The laser eavesdropping technology does not directly irradiate the eavesdropping target and due to the scattering of the glass, the existing intercepted laser warning technology has no ability to obtain any information of the eavesdropping source. Aiming at this problem, an anti-laser eavesdropping warning system by staring at the windows using a charged coupled-device(CCD) camera and optical filter was proposed. At the same time, the space geometric model for the eavesdropping laser source, the scattered spot on glass and the anti-laser eavesdropping system was built, the image feature extraction algorithm such as the edge extraction and the least squares image fitting algorithm were used to fit the scattered laser spot contours, and finally, the mathematical model of eavesdropping laser light source was deduced. The experimental results show that, the laser eavesdropping warning system not only can detect the eavesdropping spot which is irradiated on the glass, but also can be traced back to the azimuth angle and pitch angle information of the laser beam, with positioning accuracy ≤ 4°, thus the purpose for locating the eavesdropping source position is achieved. The anti-laser eavesdropping early warning system and eavesdropping source localization technology mentioned can help to promote the further development of the existing laser warning technology, and play an active role in national defense security and other fields.