摘要
针对传统基于最小几何精度因子(GDOP)值的快速选星算法仅考虑卫星几何构型,并未考虑观测质量对定位精度的影响,所选卫星子集的定位性能不能达到最优的问题,提出了一种基于定位精度贡献度的加权GDOP(WGDOP)值逆向逐次剔星快速选星算法。该方法通过构造WGDOP值贡献度作为各颗卫星对定位精度贡献度的评价指标,计算各颗卫星对当前卫星集合的WGDOP值贡献度,逐次剔除对定位精度贡献度较低的卫星,从而实现快速选星并保证卫星集合拥有良好的几何构型以及较高的精度水平。试验结果表明,提出的选星算法相较于传统的基于GDOP贡献度的快速选星算法,由于综合考虑了卫星几何构型和观测数据质量对定位精度的影响,可以显著削弱由卫星减少导致的定位精度损失,具有更好的定位性能。
A traditional fast satellite selection algorithm,which relies solely on minimizing the geometric dilution of precision(GDOP)and neglects the influence of observation quality on positioning accuracy,may result in suboptimal positioning performance of the selected satellite subset.To address this issue,a backward iterative satellite elimination algorithm is proposed,considering the weighted GDOP(WGDOP)based on positioning accuracy contribution.This algorithm constructs the WGDOP contribution degree as an evaluation metric to assess each satellite's contribution to positioning accuracy.By calculating the WGDOP contribution degree of each satellite within the current satellite set,it iteratively eliminates those with low contributions,thereby ensuring rapid satellite selection while maintaining a favorable geometric configuration and high precision level.Experimental results demonstrate that,compared to the conventional fast satellite selection algorithm based on GDOP contribution degree,the proposed method significantly reduces the positioning accuracy loss due to satellite reduction.This is attributed to its comprehensive consideration of both satellite geometry and observation data quality on positioning accuracy,resulting in superior positioning performance.
作者
张且且
方乐
赖际舟
王兵浩
ZHANG Qieqie;FANG Le;LAI Jizhou;WANG Binghao(College of Automation,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;Beijing Satellite Navigation Center,Beijing 100094,China)
出处
《宇航学报》
北大核心
2025年第1期108-116,共9页
Journal of Astronautics
基金
国家自然科学青年基金(62203216)
国家重点研发计划(2022YFB3904300)
国家自然科学基金民航联合基金(U2233215)
江苏省自然科学青年基金(BK20220886)。
关键词
定位精度贡献度
加权几何精度因子(WGDOP)
快速选星
伪距观测质量
Positioning accuracy contribution degree
Weighted geometric dilution precision(WGDOP)
Fast satellite selection
Pseudo-range observed mass
