卫星摄影系统象移补偿速高比计算

本文研究了卫星摄影系统象移补偿速高比计算。从飞机上拍摄地面景物时,象移补偿速高此中的速度为地面相对飞机的速度,通常称为地速。但是,从卫星上拍摄地面照片时,如果把速高比中的速度取为地面相对于卫星的速度,则会导出谬误。为此,作者对速高比的定义进行了推广,对于这种拓广的速高比定义,也能适用于从飞机上拍摄地面景物的速高比计算。本文在推导公式过程中,把地球视为旋转椭球体,卫星轨道为椭圆轨道,导出了计算星下点速度和速高比的公式。最后与把地球视为正球体,忽略轨道偏心率的计算结果相比较,速高比的相对误差不超过0.5%。

A METHOD OF VELOCITY-HEIGHT RATIO CALCULATION FOR IMAGE-MOVING COMPENSATION OF A SATELLITE PHOTOGRAPH SYSTEM

A calculating method of velocity-height ratio for image-moving compensation of a satellite photograph system is presented. When the scene on the ground is photographed from an aircraft, the velocity in the velocity- height ratio for the image-moving compensation is one of the ground relative to the aircraft, i. e. so called ground velocity. However, when the scene on the ground is photographed from a satellite, if the velocity was taken as one of the ground relative to the satellite, then the great error would be made. So, the authors have modified the definition of the velocityheight ratio. Such a new definition is suitable to be used for the photographing from aircraft as well as from satellite.Having considered the globe as a spheroid and the orbit of the satellite as elliptic, this paper derived the equations for calculation of the sub-sate llite point and the velocity-height ratio, finally compared such results with those under considering the globe as a sphere and neglecting the eccentricity of the orbit, the relative error of velocity-height ratio is less than 0.5%.