摘要
激光测距仪与立体测绘相机在对地目标定位方面具有较强的互补性,将两者结合可以获取较高的地面目标三维定位精度。利用激光测距仪辅助立体测绘相机实现全球大比例尺无控测图是当今测绘卫星的发展方向。激光测距仪的定位精度主要受俯仰角和侧摆角的影响,由于失重、热交变、微振动等外界环境的影响以及激光器发射激光束存在自身抖动,星载激光测距仪的激光出射方向是不断变化的。为实现高精度地面目标定位,满足大比例尺测绘需求,需要对激光出射方向进行精确测量。文章提出了一种基于足印记录相机的激光测距仪姿态确定方法,该方法采用足印记录相机、地相机图像联合处理的技术,解决了激光测距仪姿态角和激光指向高精度确定问题。通过误差分析,该方法能够满足1︰10 000比例尺定位精度的要求。
Because the high complementarity of laser range finder and tridimensional mapping camera in the field of space-to-ground orientation, the combination of them can obtain high precision of the ground target three-dimensional orientation. Nowadays, it is the developing direction of mapping satellite that laser range finder assists the tridimensional mapping camera to realize the global large-scale measurement without controlling. The position precision is mainly affected by the pitching angle and stroll angle. The laser transmitting direction of space-borne laser range finder is variable due to the jittering of laser itself and environment influence such as zero gravity, thermal cycling and micro-vibration. To realize high precision target orientation and meet the large-scale mapping requirement, it is necessary to measure the laser transmitting direction precisely. An attitude determination method of the space-borne laser range finder is designed, based on footprint recording camera. This method utilizes a combined processing technology of footprint recording camera and ground camera, to solve the highly precise determination problem of attitude angle and laser pointing. This method can meet the requirement of 1：10 000 scale position accuracy.
出处
《航天返回与遥感》
北大核心
2015年第3期86-91,共6页
Spacecraft Recovery & Remote Sensing
关键词
星载激光测距仪
定位精度
姿态确定
误差分析
测绘卫星
space-borne laser range finder
positioning accuracy
attitude determination
error analysis
cartographic satellite
