自主导航星上快速星历拟合算法研究

发布时间：2018-05-26 17:47

本文选题：北斗卫星导航系统 + 广播星历　；参考：《测绘科学》2017年08期

【摘要】：针对北斗卫星导航系统地面监测站布设范围有限,系统抗打击能力不足等问题,我国已计划实现卫星自主导航。通过地面演示验证发现,星上自主定轨与时间同步软件同星上广播星历拟合软件耗费同等的机时。该文的研究目标为在保证精度的前提下,降低星上自主星历拟合的计算量。通过试验分析表明,采用直接降低星历参数个数的方法,会损失精度,效果不佳。利用自主导航自身特点,以长期预报星历为基础,通过参数固定,可在保证精度的基础上使矩阵求逆运算量降低近6倍。以长期预报星历为初值,可有效降低迭代次数,使计算量下降近5倍。
[Abstract]:In order to solve the problems of limited range of ground monitoring stations and insufficient anti-strike ability of Beidou satellite navigation system, China has planned to realize autonomous satellite navigation. It is found that the on-board autonomous orbit determination and time synchronization software consume the same computer time as the onboard broadcast ephemeris fitting software. The aim of this paper is to reduce the computational complexity of satellite autonomous ephemeris fitting under the premise of ensuring accuracy. The experimental results show that the method of directly reducing the number of ephemeris parameters will lose the precision and the effect is not good. On the basis of the characteristics of autonomous navigation and the long-term prediction ephemeris, the computation of matrix inversion can be reduced by nearly 6 times on the basis of ensuring precision by fixed parameters. Taking the long term prediction ephemeris as the initial value, the iteration times can be effectively reduced, and the calculation amount will be reduced nearly 5 times.
【作者单位】：地理信息工程国家重点实验室;西安测绘研究所;中国科学院上海天文台;北京卫星导航中心;
【基金】：国家自然科学基金项目(41204020)
【分类号】：P228

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