摘要
针对脉冲激光引信系统在降雨等复杂环境下定距性能下降的问题,根据激光在离散随机介质中的传输和散射理论,计算了降雨中的散射和衰减系数。建立激光脉冲在降雨中的蒙特卡罗法传输模型,并模拟降雨衰减对激光引信精确定距的影响。模拟结果表明,雨滴的散射和衰减作用,会使激光脉冲在传输过程中产生一定的衰减和延时。传输距离为500 m时能量已衰减44%。降雨衰减系数越大,激光信号衰减及波形畸变越严重。脉冲宽度窄的发射信号,传输延时小,但能量衰减比较大。随着脉冲宽度的增加,传输延时增大,但能量衰减相对减小。
For the problem of the ranging performance of pulsed laser fuze systems that is descendent in complex environments such as rain, the scattering and attenuation coefficients in the rain are calculated based on the scattering theories of laser in discrete random media. A transmission model of laser pulse in the rain is established using the Monte Carlo approach, and the influences of rain attenuation on the ranging performance are analyzed. The simulation results indicate that the laser pulse is attenuated and extended during the transmission due to the scattering and attenuation of raindrops. When the transmission distance is 500m,the laser energy is attenuated by 44%. The bigger the rain attenuation is, the greater the laser signal attenuation and waveform distortion are. The emission signal with narrow pulse width has small transmission delay and large energy attenuation. The transmission delay increases and the energy attenuation decreases with the increase of the pulse width.
出处
《南京理工大学学报》
EI
CAS
CSCD
北大核心
2012年第3期470-475,共6页
Journal of Nanjing University of Science and Technology
基金
国家部委基金(9140A05010610BQ02)
