Proceedings of the Satellite Division's International Technical Meeting最新文献_第8页

Robust Regional Ionospheric Augmentation Based on IRIM for PPP-RTK 基于IRIM的PPP-RTK鲁棒区域电离层增强

Proceedings of the Satellite Division's International Technical Meeting Pub Date : 2023-10-05 DOI: 10.33012/2023.19307

Sijie Lyu, Yan Xiang, Wenxian Yu

{"title":"Robust Regional Ionospheric Augmentation Based on IRIM for PPP-RTK","authors":"Sijie Lyu, Yan Xiang, Wenxian Yu","doi":"10.33012/2023.19307","DOIUrl":"https://doi.org/10.33012/2023.19307","url":null,"abstract":"Ionospheric corrections are crucial for PPP-RTK. Apart from the deterministic part of ionospheric corrections, the stochastic part is also essential in augmented high-precision positioning. An improper stochastic model will degrade the positioning performance even if the accurate ionospheric corrections are applied. In this paper, the satellite-specific ionospheric residual integrity monitoring (IRIM) index is broadcasted as a part of regional slant ionospheric model. The IRIM index is the 95% quantile of modeling residuals for each satellite representing the accuracy of ionospheric corrections. In the user end, we expand the IRIM index with a factor and regard it as the uncertainty of ionospheric corrections. It shows that 99.78% of uncertainty values wrap the residual. Then, positioning performances are compared among three modes, PPP-AR, PPP-RTK with fixed variance, and PPP-RTK with changed variance based on IRIM. Results show that PPP-RTK with proper variance shows the best performance both in positioning error and convergence time. Compared with PPP-AR, the positioning errors of IRIM-based PPP-RTK reduce from 0.032 m to 0.02m and 0.085 m to 0.044 m in horizontal and vertical direction, respectively. It is similar as the positioning errors of PPP-AR. As for the convergence time, PPP-RTK and IRIM-based PPP-RTK both converge within 1 min. But it takes PPP-AR 4.5 mins to converge.","PeriodicalId":498211,"journal":{"name":"Proceedings of the Satellite Division's International Technical Meeting","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135484054","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Validation Methods to Study the Consistency and Quality of Radio Occultation Electron Density Profiles: Application to COSMIC 研究掩星电子密度分布一致性和质量的验证方法:在COSMIC中的应用

Proceedings of the Satellite Division's International Technical Meeting Pub Date : 2023-10-05 DOI: 10.33012/2023.19184

Gabriel O. Jerez, Manuel Hernández-Pajares, Daniele B. M. Alves, João F. G. Monico

{"title":"Validation Methods to Study the Consistency and Quality of Radio Occultation Electron Density Profiles: Application to COSMIC","authors":"Gabriel O. Jerez, Manuel Hernández-Pajares, Daniele B. M. Alves, João F. G. Monico","doi":"10.33012/2023.19184","DOIUrl":"https://doi.org/10.33012/2023.19184","url":null,"abstract":"Radio occultation (RO) is a relevant source of information from the atmosphere. Besides providing global coverage, due to the geometry of the data acquisition, RO provides measurements that can help to suppress gaps from other techniques. In this sense, RO data assimilation has potential to improve atmospheric products such as ionospheric models and numerical weather prediction. Constellation Observing System for Meteorology, Ionosphere and Climate (COSMIC) (2006-2020) has been one of the main RO missions, with significant number of atmospheric profiles available, especially considering the ionosphere. The ionosphere is of special relevance because it can influence the accuracy of global navigation satellite systems (GNSS) and related applications. This way, the assessment and filtering of RO data is crucial in order to identify profiles with questionable information. Many investigations have been developed aiming to provide methods of validation for RO profiles, however, no clear methodology for filtering the RO data can be easily found. In this context, in this work, seven RO filtering methods are applied including manual filtering of noisy data and discrepancies considering the first principles-based Chapman model in a normal distribution. The set of strategies using the normal distribution criteria leads to large rates of profiles exclusion (close to 90 % in some scenarios), while in most of the cases the foF2 differences do not show improvement. On the other hand, the strategy with manual filtering, in general, excludes 35 % of the profiles, leading to gain of about 7 % in the foF2 error.","PeriodicalId":498211,"journal":{"name":"Proceedings of the Satellite Division's International Technical Meeting","volume":"126 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135484106","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Galileo-SDR-SIM: An Open-Source Tool for Generating Galileo Satellite Signals Galileo- sdr - sim:一个用于生成伽利略卫星信号的开源工具

Proceedings of the Satellite Division's International Technical Meeting Pub Date : 2023-10-05 DOI: 10.33012/2023.19254

Harshad Sathaye, Maryam Motallebighomi, Aanjhan Ranganathan

{"title":"Galileo-SDR-SIM: An Open-Source Tool for Generating Galileo Satellite Signals","authors":"Harshad Sathaye, Maryam Motallebighomi, Aanjhan Ranganathan","doi":"10.33012/2023.19254","DOIUrl":"https://doi.org/10.33012/2023.19254","url":null,"abstract":"In today’s world, satellite navigation systems, like GPS, are crucial for many essential tasks, such as guiding self-driving cars and managing power grids and transportation. These systems depend on signals continuously transmitted by satellites in orbit, providing accurate location and timing information. Galileo is one of these satellite systems that is becoming increasingly important. It has recently added security features to ensure the information it sends is genuine, resulting in a growing demand for Galileo (ESA (2023)). They must be tested thoroughly to ensure Galileo-dependent applications work well and are secure. One challenge is that researchers and developers need a way to create custom Galileo signals for their tests. Commercial signal generators are available but expensive and may not be accessible to many researchers. That’s why there’s a need for an open-source Galileo Signal Generator that is highly accessible. This paper introduces “Galileo-SDR-SIM”, a tool for generating and transmitting Galileo signals. It connects easily to software-defined radios, making it possible to send these signals in real-time. We’ve tested it extensively with various GNSS receivers, including software-defined receivers (GNSS-SDR 2) and hardware receivers from well-known manufacturers like u-Blox 3 4. The results show that COTS receivers can obtain a 3D fix with a mean location offset of only 1.055 meters. Finally, we release our implementation as open source for further development^5.","PeriodicalId":498211,"journal":{"name":"Proceedings of the Satellite Division's International Technical Meeting","volume":"100 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135484109","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

LiDAR and UWB-Based Scalable Collaborative Positioning 基于激光雷达和超宽带的可扩展协同定位

Proceedings of the Satellite Division's International Technical Meeting Pub Date : 2023-10-05 DOI: 10.33012/2023.19435

Andrea Masiero, Charles Toth, Xiankun Wang, Fabio Remondino

{"title":"LiDAR and UWB-Based Scalable Collaborative Positioning","authors":"Andrea Masiero, Charles Toth, Xiankun Wang, Fabio Remondino","doi":"10.33012/2023.19435","DOIUrl":"https://doi.org/10.33012/2023.19435","url":null,"abstract":"Nowadays, Positioning, Navigation and Timing (PNT) systems play a key role in many applications, ranging from vehicle to personal navigation to Location Based Services (LBS). In fact, the availability of GNSS-based PNT systems enabled the development of new applications and solutions in many fields. While outdoors precise solutions can be obtained in a wide range of environmental conditions, there are still a number of situations, such as indoors, in tunnels and urban canyons, where it is hard to achieve a good navigation solution due to the unreliability or unavailability of GNSS (Global Navigation satellite System). Therefore, there is a strong motivation to search for alternative methods in order to provide reliable positioning in challenging scenarios. Sensor integration, combining information provided by multiple sensors is commonly accepted as the primary approach to obtain navigation solution in GNSS-denied environment. The increasing deployment of connected devices, including assisted and autonomous vehicles, however, offers the possibility of implementing collaborative strategies within the network of interconnected platforms. This work is part of an ongoing project that aims at investigating the development of collaborative positioning and navigation of ground and aerial platforms. In the implemented scalable distributed collaborative positioning approach, each platform runs an Extended Kalman filter (EKF), where the state vector of each of such EKFs contains the corresponding platform position, velocity and acceleration variables. In addition, range observations and communication from Ultra-Wide Band (UWB) and LiDAR (Light Detection and Ranging) are considered in each EKF, involving only platforms in the close neighborhood of the considered agent. This paper presents basic characteristics of a dataset collected to investigate the performance of joint collaborative navigation of air and ground platforms and the obtained initial results.","PeriodicalId":498211,"journal":{"name":"Proceedings of the Satellite Division's International Technical Meeting","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135482204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

GBAS for UAV Operations – The Positioning Service, Vertical Integrity and Operational Lessons Learned 无人机操作的GBAS -定位服务，垂直完整性和操作经验教训

Proceedings of the Satellite Division's International Technical Meeting Pub Date : 2023-10-05 DOI: 10.33012/2023.19288

Valentin Fischer, Sophie Jochems, Michael Jäger, Luciano Sarperi, Michael Felux

{"title":"GBAS for UAV Operations – The Positioning Service, Vertical Integrity and Operational Lessons Learned","authors":"Valentin Fischer, Sophie Jochems, Michael Jäger, Luciano Sarperi, Michael Felux","doi":"10.33012/2023.19288","DOIUrl":"https://doi.org/10.33012/2023.19288","url":null,"abstract":"In continuation of previous work, this paper addresses three challenges regarding the GBAS positioning service for UAV navigation. Firstly, the concept of ensuring the position integrity not only in the horizontal but also vertical domain is explored. As the GBAS positioning service as it is currently defined does not foresee vertical integrity, a vertical protection level, similar to the horizontal one, is developed. Secondly, the architecture and implementation of the system is shown such that real-time navigation is enabled. For this, the GBAS messages are received close to the GBAS ground station. They are then forwarded to a server via a TCP socket, stored into databases, and used for position calculation and error bounding. To ensure the timely message transmission and application we monitored the latency introduced by the architecture. Thirdly, during a dynamic flight the attitude of a drone may change frequently resulting in loss of track of satellites leading to a degradation of the navigation and integrity performance. This challenge is addressed by using a gimballed antenna mount. A test flight was carried out in May 2023 using a UAV at the glider airfield in Winterthur. For positioning and integrity evaluations corrections from the GBAS ground station at Zurich Airport (18 km away from Winterthur) were used. Results showed that the accuracy of the navigation solution was generally well below 1 m, horizontally and vertically. The protection level remained below 3.5 m horizontally and 9.5 m vertically. In both cases, the protection level was driven by the ephemeris error bounds. The monitoring of the latency indicated that the calculation lasts 0.09 s on average. This means that the calculation is sufficiently fast to prevent latency. Finally, using a gimballed antenna mount showed no significant improvements, as also for the static mount no significant number of satellites were lost.","PeriodicalId":498211,"journal":{"name":"Proceedings of the Satellite Division's International Technical Meeting","volume":"301 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135482356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improving LEO Satellite Onboard SPP Orbits with Dynamic Models 用动力学模型改进SPP轨道上LEO卫星

Proceedings of the Satellite Division's International Technical Meeting Pub Date : 2023-10-05 DOI: 10.33012/2023.19461

Hang Su, Kan Wang, Xuhai Yang

{"title":"Improving LEO Satellite Onboard SPP Orbits with Dynamic Models","authors":"Hang Su, Kan Wang, Xuhai Yang","doi":"10.33012/2023.19461","DOIUrl":"https://doi.org/10.33012/2023.19461","url":null,"abstract":"Low Earth Orbit (LEO) satellites are used for various applications, such as geophysical research, global communication, global navigation, and precise orbit determination. Different methods are available for LEO satellite orbit determination. This study aims to enhance LEO satellite low-accuracy Single Point Positioning (SPP) orbits on the ground by utilizing dynamic models. The study evaluates this enhancement by introducing errors in different directions of the SPP orbits and utilizing various dynamic models (including stochastic velocity pulses) for smoothing. The findings indicate that applying appropriate stochastic pulses can well improve the SPP orbits. A spacing of 1.5 hours of the pulses has shown to be a good option for reducing the STD of the orbital errors. Additional Solar Radiation Pressure (SRP) parameters are suggested to improve the orbits further when the spacing of the pulses is longer than 1.5 hours. Among them, the constant term in the along-track direction is shown to be essential. In the noise-only case, the SPP orbits can be reduced from meter-level to dm-level by applying appropriate SRP parameters and 1.5 h stochastic pulses. For SPP orbits containing large offsets, limitations exist in the improvements. Offsets in the SPP orbital errors often result in an offset in the along-track direction that is difficult to be removed. The study suggests a useful method to improve the accuracy and bridge gaps of the onboard determined orbits, which are of low accuracy and can only be transferred back to the ground with the corresponding Cartesian coordinates due to limited resources.","PeriodicalId":498211,"journal":{"name":"Proceedings of the Satellite Division's International Technical Meeting","volume":"09 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135482361","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multi-layer PNT Solutions for Harsh User Conditions 适用于恶劣用户条件的多层PNT解决方案

Proceedings of the Satellite Division's International Technical Meeting Pub Date : 2023-10-05 DOI: 10.33012/2023.19309

J. A. García-Molina, I. Lapin, E. Plakidis, M. Cordero, R. Sarnadas, G. Caparra, M. Karpf, J. M. Parro, C. Vazquez, A. Budianu, J. Miguez, F. Melman

{"title":"Multi-layer PNT Solutions for Harsh User Conditions","authors":"J. A. García-Molina, I. Lapin, E. Plakidis, M. Cordero, R. Sarnadas, G. Caparra, M. Karpf, J. M. Parro, C. Vazquez, A. Budianu, J. Miguez, F. Melman","doi":"10.33012/2023.19309","DOIUrl":"https://doi.org/10.33012/2023.19309","url":null,"abstract":"The provision of positioning, navigation and timing (PNT) services in harsh user conditions is still a challenging problem. Indeed, the joint exploitation of multiple systems, technologies and techniques is expected to be required to achieve an accurate, resilient, and ubiquitous PNT solution in different and changing user environments, extending from open-sky to deep-urban and indoors. The focus of this paper is to present critical aspects pertaining to the multi-layer PNT system-of-systems’ approach, in which GNSS systems in MEO are exploited together with LEO satellites, 5G networks, and collaborative user solutions, among others. Some of the approaches that can support the provision of instantaneous high-accuracy solutions are discussed, namely the exploitation of meta-signals or wide-band signals in hybrid-PNT solutions, and the use of super-pilot signals for the provision of both fast-acquisition and high-accuracy code observables. Additionally, some of the tools being developed at ESA's ESTEC site for the demonstration of multi-layer PNT solutions are presented.","PeriodicalId":498211,"journal":{"name":"Proceedings of the Satellite Division's International Technical Meeting","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135482979","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Study on the Effects of Radio Location Service on RNSS in the L6-Band l6波段无线电定位业务对RNSS的影响研究

Proceedings of the Satellite Division's International Technical Meeting Pub Date : 2023-10-05 DOI: 10.33012/2023.19249

Subin Lee, Hyung-Jun Hong, Jong-Hoon Won

引用次数: 0

Blind Doppler Tracking and Positioning with NOAA LEO Satellite Signals NOAA LEO卫星信号的盲多普勒跟踪和定位

Proceedings of the Satellite Division's International Technical Meeting Pub Date : 2023-10-05 DOI: 10.33012/2023.19463

Sharbel Kozhaya, Haitham Kanj, Zaher M. Kassas

引用次数: 0

OSNMA User Performance Assessment at ESA/ESTEC – System Qualifications Tools and Methodologies 欧空局/ESTEC的OSNMA用户绩效评估-系统资格工具和方法

Proceedings of the Satellite Division's International Technical Meeting Pub Date : 2023-10-05 DOI: 10.33012/2023.19224

L. Musumeci, N. Batzilis, G. Caparra, S. Circiu, P. Crosta, D. Ibañez, X. Otero, N. Sirikan, S. Wallner, I. Fernandez-Hernandez, D. López Rodrigo

{"title":"OSNMA User Performance Assessment at ESA/ESTEC – System Qualifications Tools and Methodologies","authors":"L. Musumeci, N. Batzilis, G. Caparra, S. Circiu, P. Crosta, D. Ibañez, X. Otero, N. Sirikan, S. Wallner, I. Fernandez-Hernandez, D. López Rodrigo","doi":"10.33012/2023.19224","DOIUrl":"https://doi.org/10.33012/2023.19224","url":null,"abstract":"This article will provide an extensive collection of results from the OSNMA testing activities conducted at ESA/ESTEC including relevant setup, processing tools, data collection and testing methodologies to assess relevant KPIs such as position accuracy and availability, OSNMA data availability on a global scale, Time To First authenticated data and fix. OSNMA testing activities at ESA/ESTEC cover the monitoring of failed authentications, the global OSNMA performance as monitored by the Galileo Experimental Sensor Stations (GESS), and the assessment of local user performance in rural and urban environments. Concerning the tools, the main OSNMA system qualification tool used by the ESA is the FOC Test User Receiver, implementing real time OSNMA processing including: • parallel PVT engine with and without OSNMA, • wide grade of user configurability to emulate different receiver operational use cases, • optimized OSNMA data extraction and processing logic to maximize performance in challenging environments, • automated testing capabilities to characterize Time To First Fix (TTFF) and TTTF-Authenticated Data (TTFF-AD) for different receiver start-up assumptions. Beyond, additional receiver technology implementing OSNMA were involved in the characterization of the OSNMA performance in mobile rural and urban environments.","PeriodicalId":498211,"journal":{"name":"Proceedings of the Satellite Division's International Technical Meeting","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135483154","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0