Improvement of Augmented Multi-Constellation Satellite-Based Precise Positioning in a Wide Range of Environments

增强型多星座星基大范围环境下精密定位的改进

• 批准号: RGPIN-2014-03658
• 负责人: Langley, Richard
• 金额: $ 2.48万
• 依托单位: University of New Brunswick
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=656592
• 关键词: Improvement; Augmented; Multi; Constellation; Satellite

Although GPS was the first widely available satellite navigation system, it has now been joined by the Russian GLONASS system, and will soon be joined by the European Galileo system, the Chinese BeiDou system and the Japanese QZSS-all of which have test satellites now in orbit. There are a number of interesting problems to be solved in gaining maximum benefits from this plethora of global navigation satellite systems (GNSS) for precise positioning and navigation, and my proposed Discovery Grant research will address a number of them.**By using observations from all available satellites, regardless of constellation, we have the possibility of significantly improving navigation availability and continuity in restricted environments where signals from some directions might be blocked. We also have the potential for improved positioning accuracy due to the availability of more observations with more favourable geometry. We have already demonstrated this by combining GPS observations with those from one of the Galileo test satellites. Research is needed on how to best combine measurements from the different systems with different reference datums, reference time systems, system biases, signal types, and measurement accuracies and precisions. The algorithms and associated software for optimally processing the observations also need to be developed. We have already achieved an optimum approach for combining GPS and GLONASS legacy signal data and will extend it for data from the other constellations.**High-accuracy GNSS positioning in sub-par environments is hampered by other difficulties besides access to augmentation data. For example, in the auroral and polar regions, the ionosphere can be often disturbed resulting in scintillating observations that frequently include cycle slips or jumps in the recorded carrier-phase data. My research group has made significant progress in developing approaches for the detection and repair of cycle slips. However, the techniques are not infallible and further research into the problem of cycle slips is required. **The new GNSS along with modernized GPS will offer new signal structures on multiple frequencies that will greatly benefit positioning and navigation. My group has done some pioneering work to demonstrate some of the advantages and we will carry out further investigations as the GPS Block IIF/III, Galileo, and BeiDou constellations are built up along with the use of the new signals to be implemented for the GLONASS constellation.**Our work will also involve enhanced modelling of atmospheric effects. We will be investigating GNSS receiver performance in disturbed ionospheric conditions, including the use of GPS as a remote-sensing tool for studying the morphology of the electron distribution. This part of our work will make use of data from terrestrial GPS receivers including those of the expanded Canadian High Arctic Ionospheric Network currently being deployed by UNB. We will also begin the analysis of data from our GPS-based instrument on the Canadian CASSIOPE scientific satellite launched at the end of September 2013.**Some of our work will be coordinated with the International GNSS Service (IGS) Multi-GNSS Experiment and the IGS Real Time Pilot Project-two IGS activities in which we already participate.**All of our proposed GNSS research will be of significant benefit for positioning and navigation in Canada and worldwide.

虽然全球定位系统是第一个广泛使用的卫星导航系统，但现在俄罗斯的格洛纳斯系统已经加入，欧洲的伽利略系统、中国的北斗系统和日本的QZSS也将很快加入，所有这些系统都有测试卫星在轨道上。在从用于精确定位和导航的全球导航卫星系统（GNSS）中获得最大利益的过程中，有许多有趣的问题需要解决，我提议的发现资助研究将解决其中的一些问题。通过使用所有可用卫星的观测结果，无论星座如何，我们都有可能在某些方向的信号可能被阻挡的受限环境中显着提高导航可用性和连续性。我们也有可能提高定位精度，由于更多的观测更有利的几何。我们已经通过将GPS观测结果与伽利略试验卫星的观测结果相结合来证明这一点。需要研究如何最好地将来自不同系统的测量值与不同的参考基准、参考时间系统、系统偏差、信号类型以及测量准确度和精度进行联合收割机组合。还需要开发最佳处理观测数据的算法和相关软件。我们已经实现了将GPS和GLONASS遗留信号数据相结合的最佳方法，并将其扩展到其他星座的数据。在低于标准的环境中进行高精度全球导航卫星系统定位，除了获得增强数据之外，还受到其他困难的阻碍。例如，在极光和极地地区，电离层经常受到干扰，导致观测结果不一致，经常包括记录的载波相位数据中的周跳或跳跃。我的研究小组在开发探测和修复周跳的方法方面取得了重大进展。然而，这些技术并不是绝对可靠的，需要对周跳问题进行进一步研究。 ** 新的全球导航卫星系统沿着现代化的全球定位系统将提供多个频率的新信号结构，这将大大有利于定位和导航。我的团队已经做了一些开创性的工作来证明其中的一些优势，随着全球定位系统Block IIF/III、伽利略和北斗星座的建立，我们将开展进一步的研究，同时沿着使用GLONASS星座的新信号。我们的工作还将涉及加强对大气影响的建模。我们将研究全球导航卫星系统接收器在电离层扰动条件下的性能，包括使用全球定位系统作为遥感工具研究电子分布形态。我们这部分工作将利用地面GPS接收机的数据，包括UNB目前正在部署的扩展的加拿大高北极电离层网络的数据。我们还将开始分析2013年9月底发射的加拿大CASSIOPE科学卫星 ** 上的全球定位系统仪器的数据。我们的一些工作将与国际全球导航卫星系统服务（全球导航卫星系统）多重全球导航卫星系统实验和全球导航卫星系统真实的时间试验项目协调进行，这是我们已经参与的两项全球导航卫星系统活动。我们提出的所有全球导航卫星系统研究将对加拿大和全世界的定位和导航产生重大效益。