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Remote Sensing
Special Issues
GNSS Positioning, Navigation, and Timing—Present and Beyond
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GNSS Positioning, Navigation, and Timing—Present and Beyond

A special issue of Remote Sensing (ISSN 2072-4292). This special issue belongs to the section "Engineering Remote Sensing".

Deadline for manuscript submissions: closed (31 May 2024) | Viewed by 2672

Special Issue Editors

Dr. Yang Yang

E-Mail Website
Guest Editor
Mechanical and Manufacturing Engineering, University of New South Wales, Sydney 2052, Australia
Interests: space positioning; navigation & timing (PNT); space situational awareness (SSA)
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Andrew Dempster

E-Mail Website
Guest Editor
School of Electrical Engineering and Telecommunications, University of New South Wales, Sydney, NSW 2042, Australia
Interests: navigation and position fixing; satellite-based positioning; satellite; space vehicle and missile design and testing; satellite communications; signal processing; space vehicle and missile design
Prof. Dr. Suelynn Choy

E-Mail Website
Guest Editor
School of Science, RMIT University, Melbourne, Australia
Interests: global navigation satellite systems; precise positioning; navigation; satellite-based augmentation systems; earth observation; atmospheric sensing
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This year saw the 50th Anniversary of the approval of the Global Positioning System (GPS) program by the U.S. Department of Defence. In those 50 years, GPS has been joined by three other Global Navigation Satellite Systems (GNSS) and two Regional Systems. The multi-GNSS, comprising constellations such as GPS, GLONASS, Galileo, and BeiDou, provides a global network of satellites that transmit signals enabling receivers to calculate their positions with remarkable accuracy. The field of positioning, navigation, and timing (PNT) via GNSS plays a crucial role in various domains, ranging from autonomous systems and aviation to maritime applications and space exploration. Over the years, advancements in PNT technologies have revolutionised our ability to navigate and locate objects accurately in land, air, sea, and even space environments. This Special Issue aims to explore the latest developments and research in this multidisciplinary area, shedding light on the significance of GNSS PNT and its diverse applications. By delving into these areas, we aim to contribute to the continued growth and innovation in the field of GNSS PNT, ultimately shaping the future of navigation and positioning systems across various sectors.

This Special Issue aims to explore the latest developments and research in the multidisciplinary field of GNSS PNT. By showcasing cutting-edge advancements, innovations, and studies, this Issue seeks to showcase the significance of GNSS PNT and its diverse applications. The aim is to foster a deeper understanding of the potential and challenges associated with GNSS PNT technologies and their impact on various domains.

This Special Issue aligns perfectly with the scope of the journal Remote Sensing, which focuses on the publication of high-quality research in the field of GNSS PNT and related areas.

Articles may address, but are not limited, to the following topics:

  • Autonomy on land, air, sea and in space;
  • Aviation and avionics;
  • Cooperative intelligent transport systems;
  • Machine guidance applications in agriculture, construction and mining;
  • Maritime applications;
  • Unmanned aerial systems;
  • Space applications of PNT in Earth’s orbit and for Lunar and Martian exploration;
  • Positioning infrastructure;
  • GNSS vulnerability, resilience and risk;
  • Interference detection and mitigation;
  • Policies and standards;
  • SBAS and other augmentations;
  • Data and geodesy;
  • National and international GNSS developments;
  • Emerging application areas for GNSS;
  • Key industries and their reliance on GNSS;
  • Embracing the multi-GNSS era;
  • Cyber security in PNT applications and infrastructure;
  • Alternative PNT;
  • State of the art in PNT algorithms and software development;
  • GNSS aiding and sensor fusion;
  • Positioning in GNSS-denied environments;
  • Development of GNSS receiver hardware and firmware;
  • Precise positioning using smartphones.

Dr. Yang Yang
Prof. Dr. Andrew Dempster
Prof. Dr. Suelynn Choy
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. Remote Sensing 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 2700 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.

Keywords

  • GNSS
  • PNT
  • autonomy
  • unmanned systems
  • multi-GNSS era
  • alternate PNT
  • cyber security
  • datums and geodesy
  • cooperative intelligent transport systems
  • space applications

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  • Greater discoverability: Special Issues support the reach and impact of scientific research. Articles in Special Issues are more discoverable and cited more frequently.
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Further information on MDPI's Special Issue polices can be found here.

Published Papers (3 papers)

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Research

18 pages, 2551 KiB  
Article
High-Precision Digital Clock Steering Method Based on Discrete Σ-Δ Modulation for GNSS
by Mingkai Liu, Zhijun Meng, Enqi Yan, Suyang Liu, Yinhong Lv, Xiye Guo and Jun Yang
Remote Sens. 2024, 16(15), 2794; https://doi.org/10.3390/rs16152794 - 30 Jul 2024
Viewed by 315
Abstract
A high-precision time reference is fundamental to the positioning, navigation, and timing (PNT) of global navigation satellite systems (GNSS). The precision of clock steering determines the accuracy of practical applications that rely on the time–frequency reference. With the invention of direct digital synthesizer [...] Read more.
A high-precision time reference is fundamental to the positioning, navigation, and timing (PNT) of global navigation satellite systems (GNSS). The precision of clock steering determines the accuracy of practical applications that rely on the time–frequency reference. With the invention of direct digital synthesizer (DDS) technology, digital clock steering (DCS) has gradually become a mainstream technology. However, the key factor limiting DCS accuracy is the system quantization noise, which leads to a low frequency and phase adjustment accuracy. Here we propose a DCS method based on Σ-Δ modulation to address the issue of low resolution of DAC through shaping the quantization noise. A simulated GNSS time–frequency reference system experimental platform is constructed to validate the effectiveness of the proposed method. The experimental results demonstrate that this method achieves a phase adjustment accuracy of 0.48 ps and a frequency adjustment accuracy better than 0.48 pHz, which is two orders of magnitude higher than that of existing GNSS time–frequency reference systems. Thus, the proposed method offers a significant improvement in time–frequency reference systems, leading to better performance, reliability, and accuracy in a wide range of practical applications. Full article
(This article belongs to the Special Issue GNSS Positioning, Navigation, and Timing—Present and Beyond)
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20 pages, 14634 KiB  
Article
Analysis of Radio-Shaded Areas in the Geoje Island Sea Based on the Automatic Identification System (AIS)
by Bong-Kyu Jung, Cheor-Hong Park, Won-Sam Choi and Dong-Hyun Kim
Remote Sens. 2024, 16(14), 2624; https://doi.org/10.3390/rs16142624 - 18 Jul 2024
Viewed by 355
Abstract
An automatic identification system (AIS) is often installed on merchant ships and fishing boats to prevent collisions and ensure safe navigation. The location information of ships transmitted from AIS equipment can help maritime traffic control prevent accidents. The southern coast of Korea comprises [...] Read more.
An automatic identification system (AIS) is often installed on merchant ships and fishing boats to prevent collisions and ensure safe navigation. The location information of ships transmitted from AIS equipment can help maritime traffic control prevent accidents. The southern coast of Korea comprises a complex coastline with numerous fishing boats and transit vessels. In particular, the Tongyeong and Geoje Islands include high-altitude mountains and islands, resulting in several radio-shaded areas where AIS signals cannot be received, owing to geographical effects. However, only a few studies have explored this region and performed practical experiments on the reception status of AIS locations in radio-shaded areas. In this study, we performed an experiment in the Geoje Island Sea on the southern coast to analyze the impact of high terrain on the reception rate and status of automatic identification devices. Two identical pieces of AIS equipment were installed to generate multiple radio waves, and the location data transmitted via different antennae were compared. The experimental analysis forms the basis for identifying the exact location of ships in the event of maritime accidents, facilitating rapid rescue. Moreover, the accuracy of the location transmitted by the AIS equipment can aid in detecting the cause of accidents. Full article
(This article belongs to the Special Issue GNSS Positioning, Navigation, and Timing—Present and Beyond)
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18 pages, 9186 KiB  
Article
Cost-Efficient Multi-GNSS Station with Real-Time Transmission for Geodynamics Applications
by Maurin Vidal, Paul Jarrin, Lucie Rolland, Jean-Mathieu Nocquet, Mathilde Vergnolle and Pierre Sakic
Remote Sens. 2024, 16(6), 991; https://doi.org/10.3390/rs16060991 - 12 Mar 2024
Cited by 2 | Viewed by 1433
Abstract
GNSS is a standard tool for monitoring and studying the Earth’s dynamic environment. However, the development of dense GNSS measurements remains limited in many experiments by the cost of high-class geodetic equipment to achieve the high precision required by many applications. Recently, multi-constellation, [...] Read more.
GNSS is a standard tool for monitoring and studying the Earth’s dynamic environment. However, the development of dense GNSS measurements remains limited in many experiments by the cost of high-class geodetic equipment to achieve the high precision required by many applications. Recently, multi-constellation, multi-frequency, low-power and, above all, less expensive GNSS electronic chips have become available. We present a prototype of a low-cost, open-source multi-GNSS station. Our prototype comprises a dual-frequency GNSS chip, a calibrated antenna, a Raspberry Pi card and a 4G key for data transmission. The system is easy to deploy in the field and allows precise positioning in real-time and post-processing. We assess the performance of our prototype in terms of raw data quality, and quality of the obtained high rate and daily position one-year-long time series. Our results demonstrate a quality equivalent to high-class geodetic equipment and better quality than other low-cost systems proposed so far. Full article
(This article belongs to the Special Issue GNSS Positioning, Navigation, and Timing—Present and Beyond)
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