摘要
首先建立全景着陆区域地形特征数据库,包括了特征点的经纬度、图像纹理信息、各个特征点之间的位置相关特性等;随后提取探测器下降过程中拍摄得到的地形特征,在图像数据库中进行匹配,解决了因小行星自转周期较短产生的特征点溢出视野问题,提高了光学测量的适用性;最后结合匹配点的位置信息通过计算机视觉测距原理获取探测器和小行星之间的相对位置和相对姿态。数学仿真实验验证了方案的可行性。
The structured total least norm (STLN) algorithm was used to estimate the mass and center of mass parameters. This method has three advantages comparing with the existing methods, the dynamic equations of satellites were not simplified; practically inaccurate thrust force and torque were not used in the equations, sensor noise was considered. Theoretical analysis shows that the STLS solution is maximum likelihood estimate when the sensor noise is Gaussian. Simulation confirms the usefulness of the method.
出处
《中国空间科学技术》
EI
CSCD
北大核心
2010年第2期68-75,82,共9页
Chinese Space Science and Technology
关键词
图像数据库
图像处理
计算机视觉
光学测量
软着陆
小行星
Structured total least squares In-orbit estimation Center of mass Structured total least norm Maximum likelihood estimate Satellite