搜索

x
中国物理学会期刊

大气扰动密度场光散射信号成像仿真方法

CSTR: 32037.14.aps.74.20250249

Imaging simulation of light scattering signals in atmospheric disturbance density fields

CSTR: 32037.14.aps.74.20250249
PDF
HTML
导出引用
  • 空中飞行器在飞行过程中对邻近大气环境造成扰动, 形成明显有别于自然背景的大气密度空间分布特征. 本文提出基于大气扰动密度场远距离感知飞行器存在的构想, 针对性地设计了对大气扰动区域散射光进行三维层析成像的探测模式, 以及扰动光信号产生、传递和响应的全过程仿真链路. 重点解决了在短曝光条件和激光脉冲二次散射作用下的成像调制传递函数估算问题, 构建了飞行器扰动密度场的光散射回波成像仿真模型. 模拟了大气扰动密度场对主动光源的散射回波信号图像和与无扰动背景的差异图像, 并在此基础上讨论了不同系统参数下的仿真结果. 该模型可以为探测系统设计提供分析工具, 并为相关探测技术的发展提供基础.

     

    During flight operations, aircraft induces atmospheric disturbances in the surrounding environment through aerodynamic interactions between its geometric configuration and ambient air medium, resulting in spatially distinct density distribution characteristics that are significantly different from natural background scenario. Considering the positive correlation between atmospheric medium density and light scattering intensity, theoretical analysis shows that detecting the light scattering intensity signals in disturbed regions can map density distributions, thereby extracting the features of aircraft-induced atmospheric disturbance density fields. Based on the concept of long-range aircraft detection through atmospheric disturbance density field characterization, a novel remote sensing method for aircraft detection is proposed in this work. Specifically, a three-dimensional tomographic imaging detection mode for scattered light in an atmospheric disturbance region is designed, and a comprehensive simulation framework covering the entire process of disturbance optical signal generation, transmission, and response is constructed. The study accomplishes the following tasks: 1) the critical challenges in estimating the imaging modulation transfer function under short-exposure conditions subjected to laser pulse secondary scattering effects are resolved, and a photon scattering echo imaging simulation model for aircraft-induced disturbance density fields is established; 2) the scattering echo signal images from active light sources in disturbed density fields and the differential images obtained under disturbed background and non-disturbed background are simulated, with simulation results under varying system parameters analyzed systematically. The research demonstrates that this simulation model can be used to optimize detection system parameters, develop signal processing methods, and assess long-range detection capabilities, thus providing both theoretical foundations and technical support for advancing aircraft detection technologies based on density disturbance characteristics.

     

    目录

    /

    返回文章
    返回