摘要
针对单频定位由于成本优势被广泛运用,却无法同时满足较高精度要求的问题,对低轨卫星增强单频定位精度的效果进行了探究。基于卫星工具包软件仿真北斗卫星导航系统与铱星系统观测数据,并结合误差建模实现高低轨卫星联合定位算法,分析不同纬度观测站的定位结果。结果表明,当可见卫星比例(LEO:总体)从5%上升到18%,定位精度改善比从48%提升到80%左右,呈现一定正相关性;误差标准差在U方向上均有大于50%以上减小,在E、N方向则出现大约10%的浮动,总体有改善的趋势。因此,低轨卫星的加入可以有效提高伪距单点定位精度。
Single-frequency positioning is widely used because of its cost advantages,but it cannot meet the higher accuracy requirements. The effect of enhancing single-frequency positioning accuracy of LEO satellites is explored in this paper. The observation data of BDS and Iridium satellite system are simulated based on the satellite toolkit software,and the joint positioning algorithm of high and low orbit satellites is realized by combining error modeling. The results of observation stations in different latitudes are analyzed,and the results show that when the LEO ratio increases from 5% to 18%,the positioning accuracy improvement ratio increases from 48% to 80%,showing a certain positive correlation;the standard deviation of error decreases more than 50% in U direction,and fluctuates about 10% in E and U direction,showing a general improvement trend. Therefore,the addition of LEO satellites can effectively improve the accuracy of pseudo-range single-point positioning.
作者
邵银星
赵春梅
SHAO Yinxing;ZHAO Chunmei(Chinese Academy of Surveying and Mapping,Beijing 100830,China;Beijing Fangshan Satellite Laser Ranging National Observation and Research Station,Beijing 102406,China)
出处
《测绘通报》
CSCD
北大核心
2020年第3期69-72,共4页
Bulletin of Surveying and Mapping
基金
国家自然科学基金(41774013)
中国测绘科学研究院基本科研业务费(7771818)。
