大气湍流对机载电视成像系统作用距离的影响  

The impact of atmospheric turbulence on the acquisition range of airborne television imaging system

作　　者：贠平平[1] 侯利冰 卜忠红[1] 宋慧娟[1] 李超[1] YUN Ping-ping;HOU Li-bing;BU Zhong-hong;SONG Hui-juan;LI Chao(Xi′an Institute of Applied Optics,Xi′an 710065,China)

机构地区：[1]西安应用光学研究所,陕西西安710065

出　　处：《激光与红外》2025年第1期91-96,共6页Laser & Infrared

基　　金：航空装备预先研究项目(No.30105010502)资助。

摘　　要：大气湍流严重影响机载电视成像系统的成像质量。对目标和背景光学信号传输成像机理进行分析,建立了包含大气湍流效应的基于最小可分辨对比度(MRC)的电视成像系统作用距离模型。对大气湍流基本理论进行分析,分析得出适用于直升机载电视成像系统的大气折射率结构常数,给出了大气相干直径计算方法,建立了大气湍流调制传递函数。以某型直升机载电视成像系统为例,对大气湍流效应对电视成像系统作用距离的影响进行仿真分析,仿真结果表明大气湍流效应使直升机载电视成像系统的作用距离性能严重下降。研究结果可为直升机载电视成像系统作用距离指标论证提供参考,提高指标论证准确度。Atmospheric turbulence seriously affects the imaging quality of airborne television imaging systems.In this paper,an analysis is conducted on the imaging mechanism of optical signal transmission for targets and backgrounds,and a Minimum Distinguishable Contrast(MRC)-based television imaging system acquisition range model is established,which includes atmospheric turbulence effects.The basic theory of atmospheric turbulence is analyzed,and the atmospheric refractive index structure constant suitable for helicopter borne television imaging systems is obtained.A calculation method for atmospheric coherent diameter is provided,and a modulation transfer function for atmospheric turbulence is established.Taking a certain type of helicopter borne television imaging system as an example,the influence of atmospheric turbulence on the acquisition range of the television imaging system is simulated and analyzed.The simulation results show that the atmospheric turbulence effect seriously reduces the acquisition range performance of the helicopter borne televisioin imaging system.The research results can provide a reference for the demonstration of the acquisition range index of helicopter borne television imaging systems,and improve the accuracy of indicator demonstration.

关 键 词：大气湍流 大气相干直径 调制传递函数 机载电视成像系统 作用距离预测 

分 类 号：TN911.73[电子电信—通信与信息系统] P427[电子电信—信息与通信工程]