Abstract
虽然基于卫星轨道动力学模型的增强型GPS实时星间相对定位可获得厘米级精度, 但通常在一般条件下难以获取高精度轨道动力学模型. 本文提出了一种无轨道动力学模型条件下的高精度实时相对定位方法, 即利用GPS三差观测方程获得状态矢量的时间转移矩阵, 采用自适应UKF (Unsented Kalman Filter, 无迹卡尔曼滤波器)实时估计星间相对位置. 仿真结果表明, 相比传统的序贯点估计方法分米级的相对定位精度, 新方法在星间距离小于5 km时, 其相对定位精度可达厘米量级.
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