线性调频脉冲激光引信在烟雾中的回波特性仿真研究  

Characteristics simulation of linear frequency modulated pulse laser fuse backscattering signals in smoke

作　　者：丁星 梁超 张向荣[1] 张雪霞 牛兰杰 DING Xing;LIANG Chao;ZHANG Xiangrong;ZHANG Xuexia;NIU Lanjie(School of Artificial Intelligence,Xidian University,Xi'an,Shaanxi 710071,China;Xi′an Institute of Electromechanical Information Technology,Xi'an,Shaanxi 710065,China;Xi′an Modern Control Technology Research Institute,Xi'an,Shaanxi 710065,China;Laser Key Laboratory,North China Research Institute of Electro-optics,Beijing 100015,China)

机构地区：[1]西安电子科技大学人工智能学院,陕西西安710071 [2]西安机电信息技术研究所,陕西西安710065 [3]西安现代控制技术研究所,陕西西安710065 [4]华北光电技术研究所激光重点实验室,北京100015

出　　处：《光电子．激光》2024年第10期1075-1081,共7页Journal of Optoelectronics·Laser

摘　　要：为了提高激光引信对烟雾环境适应的能力,研究了线性调频(linear frequency modulated,LFM)脉冲激光引信的烟雾回波特性。通过对蒙特卡洛算法进行计算速度优化建立了烟雾中激光散射模型,研究了烟雾后向散射波形变化规律和影响探测性能的因素。结果表明:LFM脉冲在烟雾中的回波信号由烟雾低频(low frequency,LF)、烟雾高频(high frequency,HF)、目标信号3种叠加而成。当烟雾浓度1.4 mg/m^(3)时,目标信号完全被衰减。虽然烟雾LF对目标信号检测影响不大,但是当烟雾浓度大于1.2 mg/m^(3)时,烟雾HF和目标信号频谱混叠导致激光引信产生虚警信号。与传统脉冲激光相比,LFM脉冲激光可以适应更高浓度的烟雾,并且带宽越宽抗烟雾干扰能力越强。该研究结果对LFM脉冲激光引信的设计和信号处理具有重要支撑。In order to improve the adaptability of laser fuse in smoky environment,the echoing characteristics of linear frequency modulated(LFM)pulse laser fuse is studied.The laser scattering model in smoke is established by optimizing the calculation speed of Monte Carlo algorithm.The results show that the echoing signal of LFM pulse in smoke is composed of three types.They are low frequency(LF),high frequency(HF)and target signal.When the smoke concentration is 1.4 mg/m^(3),the target signal is completely attenuated.Although the LF of smoke has little effect on target signal detection,when the smoke concentration is greater than 1.2 mg/m^(3),the aliasing of smoke HF and target signal spectrum causes the laser fuse to generate false alarm signals.Compared with traditional pulse lasers,LFM pulse lasers can adapt to higher concentrations smoke.The wider the bandwidth,the stronger the ability to resist smoke interference.The research results provide important support for the design and signal processing of LFM pulse laser fuses.

关 键 词：线性调频(LFM)脉冲 激光引信 后向散射 激光测距 

分 类 号：TN249[电子电信—物理电子学]