GPS Solutions最新文献_第4页

Metaheuristic-based stochastic models for GNSS relative positioning planning 基于元启发式的GNSS相对定位规划随机模型

1区地球科学

GPS Solutions Pub Date : 2023-10-29 DOI: 10.1007/s10291-023-01562-x

Ismael Érique Koch, Ivandro Klein, Luiz Gonzaga, Vinicius Francisco Rofatto, Marcelo Tomio Matsuoka, João Francisco Galera Monico, Maurício Roberto Veronez

引用次数: 0

Stochastic modeling of the receiver clock parameter in Galileo-only and multi-GNSS PPP solutions 仅伽利略和多gnss PPP解决方案中接收机时钟参数的随机建模

1区地球科学

GPS Solutions Pub Date : 2023-10-27 DOI: 10.1007/s10291-023-01556-9

Marcin Mikoś, Kamil Kazmierski, Tomasz Hadas, Krzysztof Sośnica

{"title":"Stochastic modeling of the receiver clock parameter in Galileo-only and multi-GNSS PPP solutions","authors":"Marcin Mikoś, Kamil Kazmierski, Tomasz Hadas, Krzysztof Sośnica","doi":"10.1007/s10291-023-01556-9","DOIUrl":"https://doi.org/10.1007/s10291-023-01556-9","url":null,"abstract":"Abstract In Precise Point Positioning (PPP), the receiver clock parameter is typically estimated independently in each observation epoch, which increases the noise of the estimated station coordinates and troposphere parameters due to correlations. Applying stochastic modeling to the receiver clock parameter stabilizes PPP solutions and reduces clock noise for the time transfer. However, the receiver clock modeling is possible only for the GNSS receivers connected to the utmost stable atomic clocks. We propose receiver clock modeling that involves the Markov stochastic process in the form of a random walk. We test different levels of random walk constraints for GNSS stations equipped with different types of clocks for Galileo-only and multi-GNSS solutions in kinematic and static PPP. In multi-GNSS solutions, the common clock parameter is derived with inter-system biases (ISBs). This raises the question of the constraints that should be imposed on the common clock only or also on the ISBs. We found that similar results can be achieved by imposing constraints on the common clock parameter and estimating ISB as a constant parameter and when constraining the common clock parameter and ISBs with a ratio of 1:100. Other ratios of clock-to-ISB constraints, such as 1:1 and 1:10, give inferior results. In the kinematic PPP, stochastic clock modeling has a marginal impact on the North and East coordinate components, whereas the Up component is substantially improved for GNSS receivers equipped with hydrogen masers. In the static PPP, the clock modeling improves the time transfer, due to the reduced noise of the clocks.","PeriodicalId":12788,"journal":{"name":"GPS Solutions","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136261852","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

A system for measuring the scintillation index based on the results of monitoring of small-scale fluctuations in the total electron content of the ionosphere 根据电离层总电子含量的小尺度波动监测结果测量闪烁指数的一种系统

1区地球科学

GPS Solutions Pub Date : 2023-10-26 DOI: 10.1007/s10291-023-01550-1

Vladimir P. Pashintsev, Mark V. Peskov, Mikhail A. Senokosov, Dmitry A. Mikhailov, Alexander D. Skorik

引用次数: 0

Real-time tropospheric delay map retrieval using sparse GNSS stations 基于稀疏GNSS站的对流层实时延迟地图检索

1区地球科学

GPS Solutions Pub Date : 2023-10-23 DOI: 10.1007/s10291-023-01554-x

Zheng Du, Qingzhi Zhao, Yibin Yao, Hang Zhu

引用次数: 0

COMPASSO mission and its iodine clock: outline of the clock design 指南针的使命及其碘钟:钟的设计大纲

1区地球科学

GPS Solutions Pub Date : 2023-10-18 DOI: 10.1007/s10291-023-01551-0

Frederik Kuschewski, Jan Wüst, Markus Oswald, Tim Blomberg, Martin Gohlke, Jonas Bischof, Alex Boac, Tasmim Alam, André Bußmeier, Klaus Abich, Niklas Röder, Klaus Döringshoff, Jan Hrabina, Miroslava Holá, Jindřich Oulehla, Thilo Schuldt, Claus Braxmaier

{"title":"COMPASSO mission and its iodine clock: outline of the clock design","authors":"Frederik Kuschewski, Jan Wüst, Markus Oswald, Tim Blomberg, Martin Gohlke, Jonas Bischof, Alex Boac, Tasmim Alam, André Bußmeier, Klaus Abich, Niklas Röder, Klaus Döringshoff, Jan Hrabina, Miroslava Holá, Jindřich Oulehla, Thilo Schuldt, Claus Braxmaier","doi":"10.1007/s10291-023-01551-0","DOIUrl":"https://doi.org/10.1007/s10291-023-01551-0","url":null,"abstract":"Abstract One of the limiting factors for GNSS geolocation capabilities is the clock technology deployed on the satellites and the knowledge of the satellite position. Consequently, there are numerous ongoing efforts to improve the stability of space-deployable clocks for next-generation GNSS. The COMPASSO mission is a German Aerospace Center (DLR) project to demonstrate high-performance quantum optical technologies in space with two laser-based absolute frequency references, a frequency comb and a laser communication and ranging terminal establishing a link with the ground station located in Oberpfaffenhofen, Germany. A successful mission will strongly improve the timing stability of space-deployable clocks, demonstrate time transfer between different clocks and allow for ranging in the mm-range. Thus, the technology is a strong candidate for future GNSS satellite clocks and offers possibilities for novel satellite system architectures and can improve the performance of scientific instruments as well. The COMPASSO payload will be delivered to the international space station in 2025 for a mission time of 2 years. In this article, we will highlight the key systems and functionalities of COMPASSO, with the focus set to the absolute frequency references.","PeriodicalId":12788,"journal":{"name":"GPS Solutions","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135884380","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Estimation of water boundaries and evaluation of flood risk for a reservoir using GNSS multipath reflectometry 基于GNSS多径反射法的水库水界估算与洪水风险评估

1区地球科学

GPS Solutions Pub Date : 2023-10-18 DOI: 10.1007/s10291-023-01552-z

Xiaolei Wang, Xiufeng He, Minfeng Song, Dongzheng Jia

引用次数: 0

Machine learning-based multipath modeling in spatial domain applied to GNSS short baseline processing 基于机器学习的空间域多路径建模在GNSS短基线处理中的应用

1区地球科学

GPS Solutions Pub Date : 2023-10-16 DOI: 10.1007/s10291-023-01553-y

Yuanxin Pan, Gregor Möller, Benedikt Soja

{"title":"Machine learning-based multipath modeling in spatial domain applied to GNSS short baseline processing","authors":"Yuanxin Pan, Gregor Möller, Benedikt Soja","doi":"10.1007/s10291-023-01553-y","DOIUrl":"https://doi.org/10.1007/s10291-023-01553-y","url":null,"abstract":"Abstract Multipath is the main unmodeled error source hindering high-precision Global Navigation Satellite System data processing. Conventional multipath mitigation methods, such as sidereal filtering (SF) and multipath hemispherical map (MHM), have certain disadvantages: They are either not easy to use or not effective enough for multipath mitigation. In this study, we propose a machine learning (ML)-based multipath mitigation method. Multipath modeling was formulated as a regression task, and the multipath errors were fitted with respect to azimuth and elevation in the spatial domain. We collected 30 days of 1 Hz GPS data to validate the proposed method. In total, five short baselines were formed and multipath errors were extracted from the postfit residuals. ML-based multipath models, as well as observation-domain SF and MHM models, were constructed using 5 days of residuals before the target day and later applied for multipath correction. It was found that the XGBoost (XGB) method outperformed SF and MHM. It achieved the highest residual reduction rates, which were 24.9%, 36.2%, 25.5% and 20.4% for GPS P1, P2, L1 and L2 observations, respectively. After applying the XGB-based multipath corrections, kinematic positioning precisions of 1.6 mm, 1.9 mm and 4.5 mm could be achieved in east, north and up components, respectively, corresponding to 20.0%, 17.4% and 16.7% improvements compared to the original solutions. The effectiveness of the ML-based multipath model was further validated using 30 s sampling data and data from a low-cost device. We conclude that the ML-based multipath mitigation method is effective, easy to use, and can be easily extended by adding auxiliary input features, such as signal-to-noise ratio, during model training.","PeriodicalId":12788,"journal":{"name":"GPS Solutions","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136113170","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Geocenter motion derived from multi-LEO precise orbit determination based on GNSS observations and dynamic force models 基于GNSS观测和动力模型的多leo精确定轨地心运动

1区地球科学

GPS Solutions Pub Date : 2023-10-15 DOI: 10.1007/s10291-023-01546-x

Keke Zhang, Xingxing Li, Weiping Jiang, Yuanchen Fu, Yongqiang Yuan, Jiaqing Lou, Wei Zhang

引用次数: 0

IROTI: a new index to detect and identify traveling ionospheric disturbances and equatorial plasma bubbles IROTI:一种探测和识别电离层扰动和赤道等离子体气泡的新指数

1区地球科学

GPS Solutions Pub Date : 2023-10-12 DOI: 10.1007/s10291-023-01545-y

Xiaodong Ren, Xuan Le, Dengkui Mei, Hang Liu, Xiaohong Zhang

引用次数: 0

Assessing all-frequency GPS/Galileo/BDS PPP-RTK in GNSS challenging environments 在GNSS挑战环境中评估全频率GPS/Galileo/BDS PPP-RTK