Topic
GNSS augmentation
About: GNSS augmentation is a research topic. Over the lifetime, 2478 publications have been published within this topic receiving 28513 citations. The topic is also known as: SBAS & Satellite Based Augmentation System.
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TL;DR: The result shows that the platform can generate multi-mode and multi-frequency navigation signals through reconfiguration of the software and hardware on the same platform, hence supporting design of a number of navigation systems including Beidou, Global Positioning System (GPS), Russian Global Navigation Satellite System (GLONASS) and European Galileo system.
Abstract: Navigation signal simulator can generate signals consistent with real GNSS (Global Navigation Satellite System) signals, which can be processed by GNSS receivers in the same manner as it processes satellite signals in a real testing environment. The simulator can offer a high-fidelity means of testing GNSS receivers and other related systems. Such tests can be carried out in laboratories due to control of the GNSS constellation and global atmospheric environment by a single device. The navigation signal simulator, which can provide a real-like environment for the research and testing of navigation receivers, has been the key instrument for developing navigation systems and receiving devices, particularly for high-dynamic receivers. Therefore it has increasingly received widespread attentions in military and industrial sectors. With the development of a variety of new navigation systems and signal standards, there is a higher demand for the compatibility and renewal speed of the navigation signal simulators; specifically, it should be multi-mode and reconfigurable in order to realize the flexible design of navigation systems. Although a lot of GNSS simulators have been developed and used, the reconfigurable technologies have not yet appeared in the literature and applied to practices. This means that the existing simulators cannot achieve simulation of multiple GNSS signals by reconfiguration of the software and hardware on the same platform. In this paper, a new reconfigurable platform for navigation signal simulation is proposed and studied, aiming to simulate multi-mode and multi-frequency navigation signals. The performance of the proposed platform is validated from three perspectives: mathematic simulation software, output signals and receiver operation. The result shows that the platform can generate multi-mode and multi-frequency navigation signals through reconfiguration of the software and hardware on the same platform, hence supporting design of a number of navigation systems including Beidou, Global Positioning System (GPS), Russian Global Navigation Satellite System (GLONASS) and European Galileo system. The GNS8000 series navigation satellite signal simulator, designed based on such platform, have been successfully applied to the Beidou navigation satellite systems and widely used in the related fields of research and industries.
6 citations
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23 May 2013TL;DR: Simulation results show that the single satellite PDOP value is not more than 3, the navigation constellations average PDOPvalue is 2.2, which meet satellite autonomous orbit determination accuracy requirements, optimize network communication performance, and to reduce the delay of the satellite network communication.
Abstract: The Crosslink Ranging and Inter-satellite communication is the key technology of autonomous navigation for satellite, resulting in a constellation of satellites using a narrow beam antenna, due to the limit of the number of antennas on the satellite that bring a problem how effective allocation of limited antenna to establish inter-satellite links, to achieve inter-satellite ranging and inter-satellite communication. According to the satellite constellation cyclical and finite state, propose a new system which suit inter-satellite ranging and inter-satellite communication and a method which make the smallest satellite position dilution of precision(PDOP) and get the topological structure that have the minimum communication link cost. By means of simulation results show that the single satellite PDOP value is not more than 3, the navigation constellations average PDOP value is 2.2, which meet satellite autonomous orbit determination accuracy requirements, optimize network communication performance, and to reduce the delay of the satellite network communication.
6 citations
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TL;DR: The PINDOC system achieved a position Root-Mean-Squared Error (RMSE), maximum error, and loop-closure error of 0.93 m, 2.23 m, and 1.28 m over the 600-meter trajectory, respectively.
Abstract: Developing a universal pedestrian navigation framework that operates through extreme environmental conditions is essential. Such a navigation framework can enable Location-Based Services (LBS) in many applications, and one application in high demand of accurate and reliable positioning solutions is firefighter localization, primarily for navigating in indoor environments where signals of Global Navigation Satellite Systems (GNSS) might degrade or fail, visibility is poor, and infrastructure dedicated to navigation is often not accessible. Jao et al. (2022a) reported a Pedestrian Indoor Navigation system integrating Deterministic, Opportunistic, and Cooperative localization approaches (PINDOC). The deterministic localization is a Zero-velocity-UPdaTe (ZUPT)-aided Inertial Navigation System (INS) enhanced with self-contained aiding approaches, including altimeter measurements and foot-to-foot ranging measurements. The opportunistic approach uses pseudorange measurements extracted from cellular Long-Term Evolution (LTE) towers and implements a Deep Neural Network (DNN)-based Synthetic Aperture Navigation (SAN) to spatially mitigate multipath. This approach operates in a base/rover framework, where a GNSS receiver and a "base" LTE receiver, both installed stationary in an outdoor environment, are used to estimate clock bias drifts of LTE towers, and the estimated clock biases are transmitted to "rover" LTE receivers equipped on agents navigating in indoor environments. The cooperative localization approach uses UWBs for inter-agent range measurements and differentiates Line-Of-Sight (LOS) and NLOS components using a power-metric-based detector. In this paper, we experimentally investigate the navigation performance of the PINDOC system. Two experiments were conducted. The first experiment involved three agents, with one agent traversing in an indoor environment a trajectory of 600 meters in 14 minutes, during which the other two agents remained stationary. The traversed trajectory included terrains of flat surfaces, stairs, ramps, and elevators. The PINDOC system achieved a position Root-Mean-Squared Error (RMSE), maximum error, and loop-closure error of 0.93 m, 2.23 m, and 1.28 m over the 600-meter trajectory, respectively. In the second experiment, all three agents traveled in the indoor environment for 12.5 minutes, and the navigation solutions estimated by the PINDOC system showed loop-closure errors of 0.35 m, 0.82, and 1.15 m for the three agents. In all cases, access to signals of opportunity and cooperative exchange of information between agents were available less than 20% of time for duration of the experiments.
6 citations
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29 May 2014
TL;DR: In this article, the authors provide an overview of the solutions proposed until now, trying to highlight what the trend is in SDR GNSS receiver development, and to what extent currently proposed SDR approaches are able to replace traditional hardware-based design.
Abstract: Co-existence of different constellations for Global Navigation Satellite Systems (GNSS) provides new opportunities to improve the services offered to the users, but also poses new challenges and increased complexity in receiver design. To ensure flexibility and dynamic re-configuration, Software Defined Radio (SDR) receivers seem to be the natural solution, both for the research and industrial communities. This paper wants to provide an overview of the solutions proposed until now, trying to highlight what the trend is in SDR GNSS receiver development, and to what extent currently proposed SDR approaches are able to replace traditional hardware-based design.
6 citations
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10 Nov 2011TL;DR: The aim of this study is to characterize and evaluate the GNSS position error of various positioning solutions which may fulfil applicable civil aviation requirements for GNSS approaches and to characterization of the statistics of the position error at the output of these GNSS receivers.
Abstract: Since many years, civil aviation has identified GNSS as an attractive mean to provide navigation services for every phase of flight due to its wide coverage area. However, to do so, GNSS has to meet relevant requirements in terms of accuracy, integrity, availability and continuity. To achieve this performance, augmentation systems have been developed to correct the GNSS signals and to monitor the quality of the received Signal-In-Space (SIS). We can distinguish GBAS (Ground Based Augmentation Systems), ABAS (Airborne Based Augmentation Systems) SBAS (Satellite Based Augmentation Systems). In this context, the aim of this study is to characterize and evaluate the GNSS position error of various positioning solutions which may fulfil applicable civil aviation requirements for GNSS approaches. In particular, this study focuses on two particular solutions which are: • Combined GPS/GALILEO receivers augmented by RAIM where RAIM is a type of ABAS augmentation. This solution is a candidate to provide a mean to conduct approaches with vertical guidance (APV I, APV II and LPV 200). • GPS L1 C/A receivers augmented by GBAS. This solution should allow to conduct precision approaches down to CAT II/III, thus providing an alternative to classical radio navigation solutions such as ILS. This study deals with the characterization of the statistics of the position error at the output of these GNSS receivers. It is organised as following. First a review of civil aviation requirements is presented. Then, the different GNSS signals structure and the associated signal processing selected are described. We only considered GPS and GALILEO constellations and concentrated on signals suitable for civil aviation receivers. The next section details the GNSS measurement models used to model the measurements made by civil aviation receivers using the previous GNSS signals. The following chapter presents the GPS/GALILEO and RAIM combination model developed as well as our conclusions on the statistics of the resulting position error. The last part depicts the GBAS NSE (Navigation System Error) model proposed in this report as well as the rationales for this model.
6 citations