CAJ | 학술논문

激光光束在大气中的传输是与大气特征有关的,如大气湍流、大气散射与吸收,而且激光测距的回波除了与距离有关外,其回波数及精度也与大气特征相关.漫反射激光测距的目标是低轨空间碎片,在一定反射截面的条件下,应用一定功率的激光进行地面靶板漫反射测距试验,以确定多少功率的激光器可实现空间碎片的漫反射测距,这时地面靶的距离选取应该具有代表性,它代表了在一定斜程下穿过整个大气层的效应.通过对大气湍流和大气衰减对激光传输的影响进行分析,理论上计算出在低轨目标为400km时,漫反射激光测距试验地面靶的水平距离该取多远时才能代表在一定斜程下穿过400km大气层的效应,从而为漫反射激光测距试验地面靶距离的选取提供参考依据.
격광광속재대기중적전수시여대기특정유관적,여대기단류、대기산사여흡수,이차격광측거적회파제료여거리유관외,기회파수급정도야여대기특정상관.만반사격광측거적목표시저궤공간쇄편,재일정반사절면적조건하,응용일정공솔적격광진행지면파판만반사측거시험,이학정다소공솔적격광기가실현공간쇄편적만반사측거,저시지면파적거리선취응해구유대표성,타대표료재일정사정하천과정개대기층적효응.통과대대기단류화대기쇠감대격광전수적영향진행분석,이론상계산출재저궤목표위400km시,만반사격광측거시험지면파적수평거리해취다원시재능대표재일정사정하천과400km대기층적효응,종이위만반사격광측거시험지면파거리적선취제공삼고의거.
In tests of laser ranging based on diffuse reflection of ground targets,the selection of distances to targets must take into account influences from the atmosphere.This is because only tests based on considerations of atmospheric influences can adequately reflect the reality encountered in future applications of laser ranging based on diffuse reflection.Since the purpose is to detect low-orbit space debris,these tests use ground targets to determine the effective ranges of laser ranging for a given target cross section at a given laser power.Among the relevant settings for such tests are target locations,which need to be at different heights along the direction of laser-beam propagation to represent different levels of laser-beam transmission within the amosphere.This paper describes the effects of atmospheric turbulence and atmospheric attenuation on laser transmission by focusing on the generating mechanisms of these effects.We list theoretical calculations at different elevation angles and different laser transmission distances,and yield the relations of these effects to the levels of transmission.Finally we determine the practical parameters for a test of laser ranging based on diffuse reflection.