星间测距对小卫星编队相对轨道状态的修正

Correction of the Relative Orbit States Based on Inter-Satellite Ranging for Micro-Satellites Formation

相对轨道状态确定是小卫星编队正常工作的基础和重要保障.针对小型化、低成本的星载GPS接收机定轨精度较低的情况,提出一种利用单纯星间测距信息对卫星编队相对轨道进行修正的方法.引入星间测距信息,采用扩展卡尔曼滤波算法提高编队的相对轨道估计精度.通过仿真验证,证实了该方案的有效性.

Determination of the relative states is the primary and important guarantee for normal operation of micro-satellite formation. With the miniaturization and low-cost spaceborne GPS receiver, the accuracy of orbit determination is low. In order to solve this problem, a method of correcting the formation relative orbit is given with only inter-satellite ranging information used. Inter-satellite ranging information is intro- duced and the extended Kalman filter is used to enhance the estimation accuracy of the relative orbit. The numerical simulation results show the validity of this approach.