High-precision services of BeiDou navigation satellite system (BDS): current state, achievements, and future directions

IF 9 1区 地球科学 Q1 ENGINEERING, AEROSPACE Satellite Navigation Pub Date : 2024-06-24 DOI:10.1186/s43020-024-00143-8
Weiguang GAO, Wei Zhou, Chengpan Tang, Xingxing Li, Yongqiang Yuan, Xiaogong Hu
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Abstract

With the rapid development of technologies such as autonomous driving and robotic navigation, the demand for accurate and reliable positioning results with BDS has increased. The current status and future development of BDS high precision services are reviewed. The operational PPP-B2b of BDS-3 achieves positioning accuracy at decimeter-level within 14 min and has the drawbacks in regional coverage and long convergence time compared with the international counterparts, such as CLAS of QZSS and HAS of Galileo. A development frame for multi-layer BDS high-precision services is proposed by considering its construction cost, compatibility of user terminal, operating maintenance burden, and service level. The global high-precision service with the improved orbit and clock accuracy enhanced with the inter-satellite link is taken as the most fundamental layer. By incorporating inter-satellite link observations, the orbit errors URE and clock errors are significantly reduced to approximately 0.05 m and 0.16 ns, respectively, which will expand PPP service to global. Based on this, the regional PPP-AR and PPP-RTK services with improved convergence performance are taken as the second layer. With PPP-AR, the convergence time drops to 10 min. With PPP-RTK, the convergence time would be further shortened to less than 3 min. The LEO enhanced PPP service is taken as the third layer which overcomes both drawbacks of the long convergence time of the inter-satellite link enhanced service (the first layer) and the regional coverage of the PPP-AR/PPP-RTK services (the second layer). The simulation results show that by introducing a LEO constellation of 288 satellites, the LEO enhanced PPP can achieve positioning accuracy better than 5 cm within approximately 1 min. In addition, the integration of LEO constellation and PPP-RTK is further proposed to enable instantaneous convergence. The implementation challenges are also presented.
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北斗卫星导航系统(BDS)的高精度服务:现状、成就和未来方向
随着自动驾驶和机器人导航等技术的快速发展,人们对 BDS 的精确、可靠定位结果的要求也越来越高。本文回顾了 BDS 高精度服务的现状和未来发展。与 QZSS 的 CLAS 和 Galileo 的 HAS 等国际同类系统相比,BDS-3 的 PPP-B2b 在区域覆盖和收敛时间长方面存在缺陷。考虑到其建设成本、用户终端兼容性、运行维护负担和服务水平,提出了多层 BDS 高精度服务的发展框架。通过卫星间链路提高轨道和时钟精度的全球高精度服务被视为最基础的一层。通过结合卫星间链路观测,轨道误差URE 和时钟误差将分别大幅降低到约 0.05 m 和 0.16 ns,从而将 PPP 服务扩展到全球。在此基础上,将收敛性能得到改善的区域 PPP-AR 和 PPP-RTK 服务作为第二层。使用 PPP-AR 时,收敛时间降至 10 分钟。PPP-RTK 的收敛时间将进一步缩短至 3 分钟以内。LEO 增强型 PPP 服务作为第三层,克服了卫星间链路增强型服务(第一层)收敛时间长和 PPP-AR/PPP-RTK 服务(第二层)区域覆盖范围小的缺点。仿真结果表明,通过引入由 288 颗卫星组成的低地轨道星座,低地轨道增强型 PPP 可在约 1 分钟内实现优于 5 厘米的定位精度。此外,还进一步提出了 LEO 星座与 PPP-RTK 的整合,以实现瞬时收敛。此外,还提出了实施方面的挑战。
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来源期刊
CiteScore
19.40
自引率
6.20%
发文量
25
审稿时长
12 weeks
期刊介绍: Satellite Navigation is dedicated to presenting innovative ideas, new findings, and advancements in the theoretical techniques and applications of satellite navigation. The journal actively invites original articles, reviews, and commentaries to contribute to the exploration and dissemination of knowledge in this field.
期刊最新文献
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