一种用于卫星间连接的短弧硬件延迟估计方法,以改善BDS-3精确轨道确定
Zhouming Yang1,2, Yunbin Yuan3, Bingfeng Tan1
1State Key Laboratory of Precision Geodesy, Innovation Academy for Precision Measurement Science and Technology, CAS, Wuhan, 430077, China.
Scientific reports
|May 23, 2025
概括
在北斗卫星导航系统 (BDS-3) 卫星间链路 (ISL) 的硬件延迟影响了精确的轨道确定 (POD). 一个新的细分估计策略通过减轻这些延迟变化,显著提高了BDS-3轨道精度.
科学领域:
- 卫星地质测量 卫星地质测
- 精确的轨道确定 (POD)
- 导航卫星系统 导航卫星系统
背景情况:
- 在北斗卫星导航系统 (BDS-3) 中的卫星间连接 (ISL) 提高了精确轨道确定 (POD) 的准确性.
- 在ISL观测中,硬件延迟引入了测量错误,影响了BDS-3卫星的POD准确性.
- 硬件延迟的变化,特别是对于C23和C30等中型地球轨道 (MEO) 卫星,可以显著影响参数估计.
研究的目的:
- 为了评估BDS-3 MEO卫星ISL观测中的硬件延迟的特征.
- 调查这些硬件延迟对精确轨道确定 (POD) 准确性的影响.
- 提出并验证一种新的策略,以减轻硬件延迟对POD的影响.
主要方法:
- 对BDS-3 MEO卫星的ISL观测中硬件延迟特征的分析.
- 开发和实施针对硬件延迟的细分估计策略.
- 通过ISL POD残余分析进行验证,与L频段轨道确定进行比较,以及卫星激光测距 (SLR) 残余.
主要成果:
- 识别了不同程度的硬件延迟波动,一些链接 (例如C23,C30) 显示出更高的变化和跳跃.
- 分段估计策略使ISL观测残留量减少了约44.3% (从6.1厘米降至3.4厘米).
- 与L带轨道相比,轨道差异显示3D RMS减少了28.2% (从26.5厘米降至19.0厘米),与L带轨道相比.
结论:
- 分段估计策略有效吸收硬件延迟和未建模错误的变化.
- 这种改进的策略显著提高了BDS-3卫星的轨道确定精度,特别是那些延迟波动很高的卫星.
- 这些发现表明了提高卫星导航系统可靠性和精度的实用方法.
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