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Editorial Board Members’ Collection Series: Global Navigation Satellite Systems (GNSSs)
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Editorial Board Members’ Collection Series: Global Navigation Satellite Systems (GNSSs)

A special issue of Sensors (ISSN 1424-8220). This special issue belongs to the section "Navigation and Positioning".

Deadline for manuscript submissions: closed (20 May 2023) | Viewed by 4221

Special Issue Editors

Dr. Robert Odolinski

E-Mail Website
Guest Editor
National School of Surveying, University of Otago, 310 Castle Street, Dunedin 9016, New Zealand
Interests: multi-GNSS precise positioning; integer ambiguity resolution; low-cost GNSS receiver; smartphone positioning
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Shuanggen Jin

E-Mail Website
Guest Editor
Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China
Interests: GNSS meteorology; remote sensing; space/planetary exploration
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This is a collection of feature papers invited by the Guest Editor team, in the field of Global Navigation Satellite Systems (GNSSs). We would process papers in all the fields of GNSS theory, models, methods and applications. The topics of the collection include but are not limited to:

GNSS Technologies:

  • Multi-GNSS positioning
  • Precise GNSS
  • GNSS Signals and Signal Processing
  • GNSS-Reflectometry
  • GNSS Ionospheric Sounding
  • Satellite Navigation, Positioning
  • Low-cost GNSS receivers and smartphones

Applications of GNSS:

  • GNSS in Indoor and Outdoor Navigation
  • GNSS in Meteorology
  • GNSS in Space
  • GNSS for Earth Observation

Dr. Robert Odolinski
Prof. Dr. Shuanggen Jin
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Sensors is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

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Further information on MDPI's Special Issue polices can be found here.

Published Papers (2 papers)

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Research

14 pages, 1586 KiB  
Article
T-RAIM Approaches: Testing with Galileo Measurements
by Ciro Gioia
Sensors 2023, 23(4), 2283; https://doi.org/10.3390/s23042283 - 17 Feb 2023
Cited by 3 | Viewed by 1849
Abstract
Several applications rely on time retrieved from Global Navigation Satellite System (GNSS), and this pushes for integrity tailored to timing. Integrity information could be broadcast by GNSS itself, but currently, there are no GNSSs providing such integrity information for a timing application. The [...] Read more.
Several applications rely on time retrieved from Global Navigation Satellite System (GNSS), and this pushes for integrity tailored to timing. Integrity information could be broadcast by GNSS itself, but currently, there are no GNSSs providing such integrity information for a timing application. The integrity provided by GNSS itself could not be timely enough for real time users and does not include local effects due to multipath or other local interferences. In order to fill the gap, integrity can be locally/autonomously computed by the receiver using Timing Receiver Autonomous Integrity Monitoring (T-RAIM) algorithms. Three T-RAIM algorithms have been designed, implemented, and tested; specifically, the algorithms are Forward-Backward (FB), Danish, and Subset. The algorithms are applied to the classical Position Velocity and Timing (PVT) solution and to the time-only case assuming the receiver coordinates are known. Tests using two identical receivers located in different scenarios, open-sky and obstructed, have been carried out to validate the algorithms proposed. The increased redundancy obtained from the knowledge of the receiver coordinates play a fundamental role for the integrity algorithms performance. The benefits of the T-RAIM algorithms activation, in signal degraded conditions, clearly emerged in terms of frequency error and Allan Deviation (ADEV). A small increase of the execution time has been observed when the T-RAIM algorithms are used. Full article
(This article belongs to the Special Issue Editorial Board Members’ Collection Series: Global Navigation Satellite Systems (GNSSs))
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20 pages, 17657 KiB  
Article
A Method for Autonomous Generation of High-Precision Time Scales for Navigation Constellations
by Shitao Yang, Xiao Yi, Richang Dong, Qianyi Ren, Xupeng Li, Tao Shuai, Jun Zhang and Wenbin Gong
Sensors 2023, 23(3), 1703; https://doi.org/10.3390/s23031703 - 3 Feb 2023
Cited by 2 | Viewed by 1628
Abstract
The time maintenance accuracy of the navigation constellation determines the user positioning and timing performance. Especially in autonomous operation scenarios, the performance of navigation constellation maintenance time directly affects the duration of constellation autonomous navigation. Among them, the frequency stability of the atomic [...] Read more.
The time maintenance accuracy of the navigation constellation determines the user positioning and timing performance. Especially in autonomous operation scenarios, the performance of navigation constellation maintenance time directly affects the duration of constellation autonomous navigation. Among them, the frequency stability of the atomic clock onboard the navigation satellite is a key factor. In order to further improve the stability of the navigation constellation time-frequency system, combined with the development of high-precision inter-satellite link measurement technology, the idea of constructing constellation-level synthetic atomic time has gradually become the development trend of major GNSS systems. This paper gives a navigation constellation time scale generation framework, and designs an improved Kalman plus weights (KPW) time scale algorithm and time-frequency steer algorithm that integrates genetic algorithms. Finally, a 30-day autonomous timekeeping simulation was carried out using the GPS precision clock data provided by CODE, when the sampling interval is 300 s, the Allan deviation of the output time scale is 5.73 × 10−14, a 71% improvement compared with the traditional KPW time scale algorithm; when the sampling interval is 1 day, the Allan deviation is 9.17 × 10−15; when the sampling interval is 1 × 106 s, the Allan deviation is 8.87 × 10−16, a 94% improvement compared with the traditional KPW time scale algorithm. The constellation-level high-precision time scale generation technology proposed in this paper can significantly improve the stability performance of navigation constellation autonomous timekeeping. Full article
(This article belongs to the Special Issue Editorial Board Members’ Collection Series: Global Navigation Satellite Systems (GNSSs))
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