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Remote Sensing
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Space-Geodetic Techniques II
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Special Issue "Space-Geodetic Techniques II"

A special issue of Remote Sensing (ISSN 2072-4292). This special issue belongs to the section "Satellite Missions for Earth and Planetary Exploration".

Deadline for manuscript submissions: 15 June 2023 | Viewed by 2311

Special Issue Editors

Dr. Xiaogong Hu

E-Mail Website
Guest Editor
Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai, China
Interests: astronomy; orbit determination; spacecraft
Special Issues, Collections and Topics in MDPI journals
Dr. Mladen Zrinjski

E-Mail Website
Guest Editor
Faculty of Geodesy, University of Zagreb, Zagreb, Croatia
Interests: geodesy; global navigation satellite systems (GNSS); remote sensing; metrology; optical geodetic instruments; electronic geodetic instruments; automation of procedures of geodetic measurements; precise geodetic measurements
Dr. Walyeldeen Godah

E-Mail Website
Guest Editor
Institute of Geodesy and Cartography, 27 Modzelewski St., 02-679 Warsaw, Poland
Interests: GNSS data for geodynamics process; satellite gravity modelling; terrestrial (relative/absolute) gravity measurements; reference system/frame; height system

Special Issue Information

Dear Colleagues,

Thank you all for the efforts and support devoted to our previous Special Issue on ‘Space-Geodetic Techniques’. The first volume was a smashing success, with multiple papers published and extensive attention in the scientific community. As such, we are pleased to announce the release of this second volume of the Special Issue, which aims to continue following the latest improvements in the space-geodetic field.

Space-geodetic techniques such as very long baseline interferometry (VLBI), global navigation satellite systems (GNSS), satellite laser ranging (SLR), interferometric synthetic aperture radar (InSAR), Doppler orbitography and radio-positioning integrated by satellite (DORIS), satellite altimetry and gravimetry, etc., have played an increasingly significant role in Earth exploration and geodetic research. Benefiting from the rapid development of satellite techniques and the creation of ground-/space-based observing systems, the establishment and maintenance of the Earth’s reference frame, the Earth’s rotation and geodynamics, navigation and positioning in high precision, gravity fields, geodetic observation, and the remote sensing and modeling of the Earth’s atmosphere and ionosphere, as well as deep space exploration, are facilitated with more accurate and dense data and are attracting more and more attention for solving challenging scientific problems.

This second Special Issue welcomes all studies related to applications of different space-geodetic techniques in space and ground observations in Earth sciences. The topics may cover anything from the classical estimation of Earth observation at high precision to more comprehensive aims and scales. Articles may address but are not limited to the following topics:

  • Global and regional gravity field modeling;
  • Satellite gravimetry and applications in global change;
  • Satellite altimetry and oceanography;
  • Geodetic remote sensing;
  • Applications of remote sensing in the global water cycle;
  • Next-generation positioning;
  • Techniques and applications in high-precision GNSS;
  • Atmosphere modeling and monitoring;
  • Space weather research;
  • GNSS reflectometry;
  • Geodetic observations and geodynamics;
  • Crust deformation and natural hazard monitoring;
  • Earth rotation;
  • Planetary geodesy.

Dr. Xiaogong Hu
Dr. Mladen Zrinjski
Dr. Walyeldeen Godah
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 2500 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

  • ground and satellite gravimetry
  • satellite altimetry
  • positioning
  • orbit determination
  • atmosphere
  • space weather
  • global climate change
  • geodynamics
  • natural hazard monitoring
  • earth rotation
  • planetary geodesy
  • GNSS-R

Related Special Issue

Published Papers (3 papers)

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Article
Centimeter-Level Orbit Determination of GRACE-C Using IGS-RTS Data
by
Duoduo Li
,
Xuhua Zhou
and
Kai Li
Remote Sens. 2023, 15(7), 1832; https://doi.org/10.3390/rs15071832 - 29 Mar 2023
Viewed by 399
Abstract
GNSS real-time applications greatly benefit from the International GNSS Service’s (IGS) real-time service (RTS). This service does more than provide for terrestrial precise point positioning (PPP); it also brings more possibilities for space-borne technology. With this service, the State-Space Representation (SSR) product, which [...] Read more.
GNSS real-time applications greatly benefit from the International GNSS Service’s (IGS) real-time service (RTS). This service does more than provide for terrestrial precise point positioning (PPP); it also brings more possibilities for space-borne technology. With this service, the State-Space Representation (SSR) product, which includes orbit corrections and clock corrections, is finally available to users. In this paper, the GPS real-time orbit and clock corrections provided by 11 analysis centers (ACs) from the day of the year (DOY) 144 to 153 of 2022 are discussed from 3 perspectives: integrity, continuity, and accuracy. Moreover, actual observation data from the GRACE-C satellite are processed, along with SSR corrections from different ACs. The following can be concluded: (1) In terms of integrity and continuity, the products provided by CNE, ESA, and GMV perform better. (2) CNE, ESA, and WHU are the most accurate, with values of about 5 cm for the satellite orbit and 20 ps for the satellite clock. Additionally, the clock accuracy is related to the Block. Block IIR and Block IIR-M are slightly worse than Block IIF and Block IIIA. (3) The accuracy of post-processing reduced-dynamic precise orbit determination (POD) and kinematic POD are at the centimeter level in radius, and the reduced-dynamic POD is more accurate and robust than the kinematic POD. Full article
(This article belongs to the Special Issue Space-Geodetic Techniques II)
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Article
Bathymetry Refinement over Seamount Regions from SAR Altimetric Gravity Data through a Kalman Fusion Method
by
Yihao Wu
,
Junjie Wang
,
Yueqian Shen
,
Dongzhen Jia
and
Yu Li
Remote Sens. 2023, 15(5), 1288; https://doi.org/10.3390/rs15051288 - 26 Feb 2023
Viewed by 728
Abstract
Seafloor topography over seamount areas is crucial for studying plate motions, seafloor seismicity, and seamount ecosystems. However, seamount bathymetry modeling is difficult due to the complex hydrodynamic environment, biodiversity, and scarcity of shipborne echo sounding data. The use of satellite altimeter-derived gravity data [...] Read more.
Seafloor topography over seamount areas is crucial for studying plate motions, seafloor seismicity, and seamount ecosystems. However, seamount bathymetry modeling is difficult due to the complex hydrodynamic environment, biodiversity, and scarcity of shipborne echo sounding data. The use of satellite altimeter-derived gravity data is a complementary way of bathymetry computation; in particular, the incorporation of synthetic aperture radar (SAR) altimeter data may be useful for seamount bathymetry modeling. Moreover, the widely used filtering method may have difficulty in combing different bathymetry data sets and may affect the quality of the computed bathymetry. To mitigate this issue, we introduce a Kalman fusion method for weighting and combining gravity-derived bathymetry data and the reference bathymetry model. Numerical experiments in the seamount regions over the Molloy Ridge show that the use of SAR-based altimetric gravity data improves the local bathymetry model, by a magnitude of 14.27 m, compared to the result without SAR data. In addition, the developed Kalman fusion method outperforms the traditionally used filtering method, and the bathymetry computed from the Kalman fusion method is improved by a magnitude of 9.34 m. Further comparison shows that our solution has improved quality compared to a recently released global bathymetry model, namely, GEBCO 2022 (GEBCO: General Bathymetric Chart of the Oceans), by a magnitude of 34.34 m. The bathymetry model in this study may be substituted for existing global bathymetry models for geophysical investigations over the target area. Full article
(This article belongs to the Special Issue Space-Geodetic Techniques II)
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Article
Clock Ensemble Algorithm Test in the Establishment of Space-Based Time Reference
by
Guangyao Chen
,
Nan Xing
,
Chengpan Tang
and
Zhiqiao Chang
Remote Sens. 2023, 15(5), 1227; https://doi.org/10.3390/rs15051227 - 23 Feb 2023
Viewed by 612
Abstract
A new concept of a space-based synchronized reference network is proposed with the development of an optical frequency reference and laser inter-satellite link. To build such time reference, three clock ensemble algorithms, namely the natural Kalman timescale (NKT) algorithm, the reduced Kalman timescale [...] Read more.
A new concept of a space-based synchronized reference network is proposed with the development of an optical frequency reference and laser inter-satellite link. To build such time reference, three clock ensemble algorithms, namely the natural Kalman timescale (NKT) algorithm, the reduced Kalman timescale (RKT) algorithm, and the two-stage Kalman timescale (TKT) algorithm are considered. This study analyzes and compares the performance of these algorithms using BDS, GPS, and Galileo satellite clock data from the GFZ GNSS clock corrections, which will be used in constructing future space-based time references. The study shows that the NKT algorithm improves frequency stability by 0.1–0.2 orders of magnitude in the short and medium term. When the satellite clock is mostly a hydrogen clock, the RKT and NKT are close, and the short and medium-term frequency stability slightly increases. In contrast, the TKT algorithm produces a timescale that improves frequency stability by 1–3 orders of magnitude. A quadratic polynomial model predicts the three timescales, with the results indicating that the short-term prediction accuracy of the satellite clock is within 1ns, and the TKT algorithm’s prediction accuracy is 1–2 orders of magnitude higher than that of the NKT and RKT algorithms. With the deployment of next-generation Low Earth Orbit (LEO) satellites equipped with higher-precision clocks, the space-based time reference system will achieve improved accuracy and greater potential for practical applications. Full article
(This article belongs to the Special Issue Space-Geodetic Techniques II)
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