基于声光光谱成像的反激光窃听告警系统关键技术研究

This project is oriented at the fundamental scientific research, including the information safety, sensing detection, etc. and applications prospects of major projects. Aiming at the difficulties in the direct interception and capture of detection warning caused by the features of eavesdropping laser beam, such as short diameter, small divergence, unknown wavelength and incidence direction, etc. a scattering detective spectral imaging warning thought based on the acousto-optic imaging technology is proposed creatively, targeting at solving the theoretical and technical problems related to the real-time warning and feature recognition. In the pre-stage study accumulation, the applicant and research group has already conduct in-depth study on the core research content, namely the tunable spectral imaging technology, and conduct the principle experimental verification for the anti-laser tapping warning technology. The project takes the studies of the applicant and research group in the laser warning and acousto-optic spectral imaging technology, etc. as the support, study the core problems, such as the laser scattering in glass medium, sky background noise suppression, as well as the laser source direction recognition, and finally establish the overall theoretical model and experimental platform of the warning system, and give the significant technical parameters, including the search angle, spectral resolution, sensitivity, etc. The research result can offer key theoretical and technical support for the future engineering realization of the system, which will be favorable for the further development of the laser warning theory and technology, as well as the offering of necessary decisive basis for the anti-laser eavesdropping prevention and countermeasures.

本项目面向信息安全，传感探测等基础科研和重大工程应用前景，针对因窃听激光束直径小，发散小，入射波长与方向不可知等特征造成的无法进行直接截获探测告警的困难，创新性地提出了一种基于声光光谱成像技术的散射探测式光谱成像告警新思路，旨在解决与实时告警及特征识别相关的理论和技术问题。在前期的研究积累中，申请人及课题组已对本项目核心研究内容声光可调谐光谱成像技术进行了深入研究，并对拟研究的反激光窃听告警技术进行了原理性实验验证。项目将以申请人及课题组在激光告警及声光光谱成像技术等良好的研究基础为支撑，研究玻璃介质中的激光散射，背景噪声抑制以及窃听激光源方位识别等核心问题，并最终建立告警系统的整体理论模型及实验平台，给出探测角、光谱分辨率、灵敏度等重要技术参数。研究结果可为系统的进一步工程实现提供关键理论和技术支撑，有助于激光告警理论与技术的进一步发展，并可为反激光窃听防护及反制措施提供必要的决策依据。

激光窃听是信息安全领域面临的重大问题之一。本项目针对因窃听激光束直径小，发散小，入射波长与方向不可知等特征造成的无法进行直接截获探测告警的困难，创新性地提出了一种基于声光光谱成像技术的散射探测式光谱成像告警新思路，旨在解决与实时告警及特征识别相关的理论和技术问题。基于该思路，项目首先对常见商用玻璃材料的散射特性及光谱特性进行了测量及理论建模，给出了相应的散射场分布模型；其次，以所得散射模型为基础，结合声光互作用耦合理论，以及光学成像理论，建立反激光窃听告警系统等效模型，推导出了激光散射光，背景辐射光等在AOTF光谱相机中的光学传递函数以及系统的响应函数等；再次，构建了窃听激光源、散射光斑和告警系统的空间三维几何模型，结合光斑边缘提取算法以及Rayleigh散射模型，推导出了激光照射方位反演数学模型；最后，基于声光可调谐滤波器、红外镜头以及红外焦平面阵列探测器等核心硬件，辅之以RF驱动软件编写，搭建出了反激光窃听告警实验平台，并有效的对窃听激光的波长、来袭方位等特征参数进行了获取。通过对获取的信息进行评价分析，对平台进行了优化和改进，给出了系统有效探测角(±60°)、有效探测波段（900nm-1700nm）光谱分辨率（<8nm）、灵敏度(>3.4mw)，来袭激光告警方位误差（<4°）等重要技术参数。本项目的研究为该告警系统的进一步工程实现提供关键理论和技术支撑，有助于激光告警理论与技术的进一步发展，并可为反激光窃听防护及反制措施提供必要的决策依据。