激光技术
激光技術
격광기술
Laser Technology
2015年
6期
829-833
,共5页
耿天琪%牛燕雄%张颖%牛海莎%许冰%牛敏%满达%张帆
耿天琪%牛燕雄%張穎%牛海莎%許冰%牛敏%滿達%張帆
경천기%우연웅%장영%우해사%허빙%우민%만체%장범
激光技术%激光主动侦测%建模与仿真%探测能力
激光技術%激光主動偵測%建模與倣真%探測能力
격광기술%격광주동정측%건모여방진%탐측능력
laser technique%active laser detection%modeling and simulation%detection capability
激光主动侦测系统可实现远距离“猫眼”目标的成像探测与识别,探测能力分析是系统设计的前提和基础。为了评估激光主动侦测系统对猫眼目标的探测能力,以激光回波功率为基础,建立了系统信噪比的数学物理模型。分析了影响探测能力的因素,数值模拟了信噪比与接收光学镜头直径、发射激光峰值功率、激光束散角以及等效反射面离焦量的定量关系。结果表明,在一定作用距离范围内,散粒噪声、背景噪声与暗电流噪声、热噪声相差至少2个数量级,系统噪声主要来源于散粒噪声及背景噪声;提高系统探测能力最为有效的方法是选用激光束散角小的光源。这一结果可用于指导激光主动侦测系统的设计。
激光主動偵測繫統可實現遠距離“貓眼”目標的成像探測與識彆,探測能力分析是繫統設計的前提和基礎。為瞭評估激光主動偵測繫統對貓眼目標的探測能力,以激光迴波功率為基礎,建立瞭繫統信譟比的數學物理模型。分析瞭影響探測能力的因素,數值模擬瞭信譟比與接收光學鏡頭直徑、髮射激光峰值功率、激光束散角以及等效反射麵離焦量的定量關繫。結果錶明,在一定作用距離範圍內,散粒譟聲、揹景譟聲與暗電流譟聲、熱譟聲相差至少2箇數量級,繫統譟聲主要來源于散粒譟聲及揹景譟聲;提高繫統探測能力最為有效的方法是選用激光束散角小的光源。這一結果可用于指導激光主動偵測繫統的設計。
격광주동정측계통가실현원거리“묘안”목표적성상탐측여식별,탐측능력분석시계통설계적전제화기출。위료평고격광주동정측계통대묘안목표적탐측능력,이격광회파공솔위기출,건립료계통신조비적수학물리모형。분석료영향탐측능력적인소,수치모의료신조비여접수광학경두직경、발사격광봉치공솔、격광속산각이급등효반사면리초량적정량관계。결과표명,재일정작용거리범위내,산립조성、배경조성여암전류조성、열조성상차지소2개수량급,계통조성주요래원우산립조성급배경조성;제고계통탐측능력최위유효적방법시선용격광속산각소적광원。저일결과가용우지도격광주동정측계통적설계。
An active laser detection system could detect and recognize cat ’ s eye targets at long distance .Detection capability analysis was the basis of system design .To assess the detection capability , a mathematical model of the system ’ s signal-to-noise ratio ( SNR ) was established based on laser echo power .The dependence of SNR on several factors , such as receiving optical lens diameter , laser peak power , laser divergence angle , defocusing distance was quantitively analyzed .The results show that at a certain distance , the detector noise comes mainly from shot noise and background noise which surpass dark current noise and thermal noise at least 2 magnitudes .The most effective way to improve detection capability is to use lasers with small divergence angles .The result is helpful for the design of active laser detection systems .