Research on Broadband Spectrum Multi-Parameter Laser Warning
Detection Technology
ZHANG Rui1, 2*, YANG Xue-mei1, 2, SHI Jin1, 2, ZHANG Zi-xuan1, 2, DING Xin1, LI Xiao1, WANG Zhi-bin1, 2, LI Meng-wei2*
1. Engineering and Technology Research Center of Shanxi Provincial for Optical-Electric Information and Instrument, North University of China, Taiyuan 030051, China
2. Academy for Advanced Interdisciplinary Research, North University of China, Taiyuan 030051, China
Abstract：With the development of laser technology, laser warning technology has become the focus of research in various countries to achieve defense against various incoming lasers, and corresponding evasion and counterattack measurements are taken according to the parameters detected by the laser warning system. At present, the main parameters of laser warning detection include incoming laser azimuth, pitch angle, laser wavelength and laser pulse width. However, the existing laser warning system can not achieve multi-parameter simultaneous detection, and the absolute direction of the incoming laser cannot be obtained due to the narrower spectral range, limited field of view, and relative azimuth angle of detection. In this paper, a new method that broadband, large field of view, multi-parameter laser warning is proposed to realize the high-precision comprehensive measurement of the wavelength, absolute azimuth, absolute pitch angle, and pulse width of incoming laser in the range of 450~1 700 nm, which is mainly composed of laser pulse width measurement, absolute angle and laser wavelength measurement, control and data processing. The pulse width measurement module comprises an optical lens, multiband narrowband filter, and high-speed photodetector to realize the photoelectric conversion of the incoming pulsed laser. The absolute angle and laser wavelength measurement module that is composed of a grating, large field of view broadband achromatic lens, multiband narrowband filter, broadband area array detector, and a three-dimensional electronic compass can obtain the incoming laser wavelength, relative azimuth and relative pitch angle by the position of the first and zero diffraction spots. Then, combined with the measured direction angle, pitch angle and roll angle of the three-dimensional electronic compass, the incoming laser's three-dimensional absolute azimuth and absolute pitch angle are obtained. The multiband narrowband filter is mainly based on the strobe filter of several commonly used military laser wavelengths, which effectively filters out the influence of the background light and reduces the system's false warning and leakage warning. After the theoretical derivation and analysis of the measurement method and parameters, we design a broadband multi-parameter laser warning detection system prototype, verifying the experimental feasibility. The experimental results show that the system's azimuth and pitch angles can reach 120° and 96°, respectively. The angle measurement accuracy is better than 1°, the central wavelength measurement accuracy is better than 10 nm, and the pulse width measurement accuracy is better than 5 ns. This technology lays the foundation for the high-precision multi-parameter comprehensive detection of incoming lasers in the sea, land, air and space fields and is expected to improve the survivability in complex battlefields.
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