摘要
海洋、空中等环境下的实时授时与定位要求越来越高,事后精密产品滞后时间较长,且网络播发的实时改正数产品受网络状态影响易中断,严重限制了实时时间同步与定位精度.因此,论文开展了基于北斗三号导航卫星系统(BeiDou-3 Navigation Satellite System,BDS-3)B2b改正数的时间传递与定位技术研究,设计了共钟时间传递和定位试验,系统分析BDS-3 B2b改正数与现有网络实时改正数、超快速产品的卫星轨道和钟差性能及时间传递与定位精度.试验结果表明:BDS-3 B2b改正数产品的卫星钟差精度优于实时改正数产品、差于超快速产品,卫星轨道精度差于其它产品,但不受网络限制;基于BDS-3 B2b改正数的PPP静态定位三维方向精度优于5 cm,略差于其它产品,单BDS工作模式收敛时间较长;基于BDS-3 B2b改正数的PPP时间传递单天精度优于0.11 ns,时间间隔6000 s对应的频率稳定度优于4.1×10^(-15),与使用法国国家空间研究中心(National Centre for Space Studies,CNES)网络实时改正数产品的精度相当.因此,基于BDS-3 B2b改正数的PPP技术可实现无网络环境下的亚纳秒时间传递和厘米级定位.
The demand for real-time positioning and time synchronization is increasing in environments such as marine and aerial settings.However,post-processing precision products suffer from long latency,and real-time correction products transmitted over networks are prone to interruptions due to network instability,which severely limits both real-time time synchronization and positioning accuracy.Therefore,this paper investigates time transfer and positioning technologies based on BeiDou-3 Navigation Satellite System(BDS-3)B2b correction products.We design two clock synchronization and positioning experiments and systematically analyze the satellite orbit and clock bias performance of BDS-3 B2b correction products,as well as the time transfer and positioning accuracy compared to existing network-based real-time correction products and ultra-rapid products.The experimental results show that the satellite clock bias accuracy of BDS-3 B2b correction products is better than that of real-time correction products but worse than ultra-rapid products.The satellite orbit accuracy is inferior to other products.For static PPP positioning based on BDS-3 B2b correction products,the 3D positioning accuracy is better than 5 cm,slightly inferior to other products,but the convergence time for single BDS mode is longer.The PPP time transfer accuracy for one day based on BDS-3 B2b correction products is better than 0.11 ns,and the frequency stability is better than 4.1×10^(−15) for a 6000 s interval,with only minor differences compared to other products.Thus,the PPP time transfer technology based on BDS-3 B2b correction products can achieve subnanosecond-level time transfer and centimeter-level positioning in environments without network access.
作者
梁子涵
张杰
钟世明
韩金阳
路润民
崔潜
LIANG Zihan;ZHANG Jie;ZHONG Shiming;HAN Jinyang;LU Runmin;CUI Qian(State Key Laboratory of Precision Geodesy,Innovation Academy for Precision Measurement Science and Technology,CAS,Wuhan 430077,China;College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《全球定位系统》
2025年第3期38-47,共10页
Gnss World of China
基金
武汉市知识创新专项项目(2023010201010082)
国家自然科学基金(42174222)
中国科学院科研仪器研制项目(YJKYYQ20190062)。
