基于基线长度准则的星历对定位精度的影响

IF 0.6 Q4 ASTRONOMY & ASTROPHYSICS Journal of Astronomy and Space Sciences Pub Date : 2023-09-01 DOI:10.5140/jass.2023.40.3.113
Shimaa Farouk, Mahmoud El-Nokrashy, Ahmed Abd-Elhay, Nasr Saba
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引用次数: 0

摘要

相对全球导航卫星系统(GNSS)定位技术虽然具有很高的精度,但也存在一些缺点。控制点的缺乏,基线的长,以及超高速和高速产品的使用增加了位置误差。本研究设计了一个新的MATLAB程序,可以帮助用户根据基线长度和GNSS点与IGS站之间的方位角自动选择合适的IGS站。这项研究提出了在埃及使用的基线长度的标准,并在项目开始之前提出了先进的估计精度。实验测试研究了观测时段、最终产品、快速产品和超快速产品与基线长度三个因素之间的关系对定位精度的影响。地面控制点调解埃及被选为试验点。选取周边9个IGS台站作为参考台站,计算测点坐标。测试点和IGS站之间的基线根据建议标准进行分类。在不同的观测时段(0.5、1、2、4、5、6、7、7.5 h)获得了测试点的坐标。结果表明,埃及基线长度分为短(小于600 km)、中(600 ~ 1200 km)和长(大于1200 km),最小观测时间为4、5、7 h,精度依次为10、19、48 mm。快速和最终产品的定位精度比超快速产品高16%。短基线是最好的情况;与长基线相比,在位置精度方面的表现减少了57%的观察时间。
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Studying the Ephemeris Effect on Position Accuracy Based on Criteria Applied to Baseline Lengths by New MATLAB Program (NMP)
Although the Relative Global Navigation Satellite System (GNSS) positioning technique provides high accuracy, it has several drawbacks. The scarcity of control points, the long baselines, and using of ultra-rabid and rabid products increased position errors. This study has designed a New MATLAB Program that helps users automatically select suitable IGS stations related to the baseline lengths and the azimuth between GNSS points and IGS stations. This study presented criteria for the length of the baselines used in Egypt and an advanced estimated accuracy before starting the project. The experimental test studies the performance of the position accuracy related to the relation between three factors: observation session, final, rabid, and ultra-rabid products, and the baseline lengths. Ground control point mediates Egypt was selected as a test point. Nine surrounding IGS stations were selected as reference stations, and the coordinates of the tested point were calculated based on them. Baselines between the tested point and the IGS stations were classified regarding proposal criteria. The coordinates of the tested point were obtained in different observation sessions (0.5, 1, 2, 4, 5, 6, 7, 7.5 h). The results indicated that the lengths of the baseline in Egypt were classified short (less than 600 km), medium (600–1,200 km), and long (greater than 1,200 km) and required a minimum observation time of 4, 5, and 7 h to obtain accuracy 10, 19, 48 mm sequentially. The position accuracy was superior for the rapid and the final than the ultra-rapid products by 16%. A short baseline was at the best case; there was a performance in position accuracy with a 57% deduction in observation time compared with the long baseline.
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来源期刊
Journal of Astronomy and Space Sciences
Journal of Astronomy and Space Sciences ASTRONOMY & ASTROPHYSICS-
CiteScore
1.30
自引率
20.00%
发文量
0
审稿时长
12 weeks
期刊介绍: JASS aims for the promotion of global awareness and understanding of space science and related applications. Unlike other journals that focus either on space science or on space technologies, it intends to bridge the two communities of space science and technologies, by providing opportunities to exchange ideas and viewpoints in a single journal. Topics suitable for publication in JASS include researches in the following fields: space astronomy, solar physics, magnetospheric and ionospheric physics, cosmic ray, space weather, and planetary sciences; space instrumentation, satellite dynamics, geodesy, spacecraft control, and spacecraft navigation. However, the topics covered by JASS are not restricted to those mentioned above as the journal also encourages submission of research results in all other branches related to space science and technologies. Even though JASS was established on the heritage and achievements of the Korean space science community, it is now open to the worldwide community, while maintaining a high standard as a leading international journal. Hence, it solicits papers from the international community with a vision of global collaboration in the fields of space science and technologies.
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