基于BDS-3多频观测的伪色多路径的提取和表征
Zhongchen Guo1,2,3,4, Xuexiang Yu1,4, Chao Hu4
1Key Laboratory of Aviation-Aerospace-Ground Cooperative Monitoring and Early Warning of Coal Mining-Induced Disasters of Anhui Higher Education Institutes, Anhui University of Science and Technology, Huainan 232001, China.
Sensors (Basel, Switzerland)
|July 14, 2023
概括
本研究引入了一种新的多频算法,用于从北斗导航卫星系统 (BDS-3) 信号中提取多路径错误. 该方法通过分析信号特征来提高定位,导航和定时 (PNT) 服务的准确性.
科学领域:
- 地质测量和地质数学
- 卫星导航系统 卫星导航系统
- 信号处理 信号处理
背景情况:
- 全球导航卫星系统 (GNSS) 的观测对定位,导航和定时 (PNT) 服务至关重要,但受到各种错误的影响.
- 伪范围观测中的多路径 (MP) 错误可能很大 (十米到米),但缺乏高精度校正模型.
- 以前的研究证实了BDS-2的MP升高相关性,但BDS-3的多频MP特征需要进一步分析.
研究的目的:
- 开发和验证一个多频算法,从BDS-3观测中提取伪色多路径 (MP) 错误.
- 分析不同BDS-3频率的MP的特征,并评估电离层延迟和噪声的影响.
- 调查BDS-3MP与卫星升高角度之间的相关性.
主要方法:
- 开发了一种基于最小平方原理的新型多频MP提取算法.
- 该算法同时消除了更高阶的电离层延迟,并为第一阶的电离层延迟消除获得了分析表达式.
- 分析涉及从各种频率组合中提取的MP,评估组合噪声效应,并检查BDS-3 MEO和IGSO卫星的长期观测.
主要成果:
- 拟议的算法成功地从BDS-3观测中提取了MP,考虑了多频组合和电离层效应.
- 该研究详细介绍了组合噪声对MP提取精度的影响,并分析了二次电离层延迟的影响.
- 确定了BDS-3 MEO和IGSO卫星长期观测中的周期性行为,并确定了MP和卫星高度之间的定量相关性.
结论:
- 开发的多频MP提取算法为分析BDS-3信号错误提供了更准确的方法.
- 了解不同频率的MP特性及其与海拔高度的相关性,对于提高PNT服务可靠性至关重要.
- 这项研究为未来的建模工作提供了宝贵的见解,以减轻GNSS中的多路径效应.
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