脉冲宽度对云雾回波的影响研究

Effect of pulse width on Cloud-and-Fog Backscattering Signal

云雾后向散射会产生引发激光引信虚警的回波信号.基于蒙特卡罗法,对云雾散射回波进行了模拟仿真,并定量给出了云雾散射回波的波形、波峰位置、脉宽和峰值功率随发射脉冲宽度的变化规律.研究结果表明,回波峰值功率随着发射脉宽的增大而增大,且当发射脉宽增大到50ns后趋于饱和,峰值功率将不随脉冲宽度的变化而变化;脉冲展宽的程度随发射脉宽的增大而减弱;发射脉宽对云雾散射回波波峰位置的影响较小.给出的回波信号模拟仿真结果可以为窄脉冲激光引信的目标识别以及探测阈值和脉冲宽度等参量的优化设计提供依据.

Scattering effects of clouds and fogs produce the backscattering signal which results in false alarm for laser fuse. Based on the Monte-Carlo technology, cloud-and-fog scattering effects are simulated, and rules of wave shape and peak power of cloud-and-fog scattering echo variable with baseline distance are qualitively given. Results show that peak power and pulse broadening extent of the laser echo goes up with pulse width increasing. However, when pulse width increases to 50 ns, peak power is saturated. Simulated results may provide target discrimination and optimized design of detecting threshold and transmitting pulse width for laser fuse with reference.