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Abdelrahim Ruby

Abdelrahim Ruby
Wuhan University | WHU · State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing

PhD Student

About

11
Publications
108,329
Reads
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2
Citations
Citations since 2017
11 Research Items
2 Citations
201720182019202020212022202301234567
201720182019202020212022202301234567
201720182019202020212022202301234567
201720182019202020212022202301234567
Introduction
Abdelrahim Ruby is an assistant lecturer at Surveying Engineering Department, Faculty of Engineering at Shoubra, Benha University, Egypt. He received his master’s degree from Benha University in Egypt in 2018. He is currently a Ph.D. student at State Key Laboratory of Information Engineering in Surveying, Mapping, and Remote Sensing (LIESMARS), Wuhan University, China. His current research mainly focuses on relativistic geodesy based on optical space links between satellites and ground stations.
Additional affiliations
May 2018 - present
Benha University
Position
  • Lecturer
August 2011 - May 2018
Benha University, Faculty of Engineering at Shoubra
Position
  • Research Assistant
Education
April 2012 - March 2018
Benha University
Field of study
  • Surveying and Geodesy
September 2006 - May 2011
Benha University
Field of study
  • Surveying Engineering

Publications

Publications (11)
Article
Full-text available
Global Geopotential Models (GGMs) may contain long-wavelength errors due to difficulties in collecting and using global heterogeneous gravity data, which further degrades the quality of regional gravity field modelling. In this study, satellite-only and high degree reference geopotential models denoted as GOCO05s and EGM2008, respectively, have be...
Thesis
Full-text available
The aim of this research is to develop a new precise and high-resolution geoid model for Egypt by refining the Global Geopotential Models (GGMs) through a process named tailoring, where the existing spherical harmonic coefficients of geopotential model are fitted to the Egyptian gravity field by integral formulas using an iterative algorithm to imp...
Conference Paper
Full-text available
The Earth’s gravity potential (geopotential) field plays an important role in geodesy, for instance, it is the basis for defining the geoid and the International Height Reference System (IHRS). In chronometric geodesy, the main challenge for directly measuring geopotential differences between two stations lies in that a reliable link for time compa...
Poster
Full-text available
According to Einstein’s general relativity theory, which concludes that a precise atomic clock runs quicker at a position with higher potential, the geopotential difference between two stations on the ground can be determined by comparing the running rates of these two clocks. Thus, we suggest an approach for determining the geopotential difference...
Presentation
Full-text available
The Establishment of a high-precision International Height Reference System (IHRS) is one of the most important goals in geodetic community. One of the conventions for the definition of IHRS is for the vertical differences between the potential of reference stations and the geoidal potential (geopotential number). Therefore, the challenge is to ach...
Conference Paper
Full-text available
High accuracy and stability of time and frequency transfer links are significant to realizing high-precision time synchronization in geodesy, navigation, and metrology. Also, the current and future challenges for space and ground geodetic observatories are to transfer high-stability time and frequency signals between remote locations. Therefore, fu...
Conference Paper
Full-text available
Establishing an International Height Reference Frame (IHRF) has been a major goal of the International Association of Geodesy (IAG) for a long time. The scope of this study is to define a unified height system for Africa using the advantages of relativistic geodetic approaches via spatial time-frequency links. We propose a ground clock network conn...
Preprint
Full-text available
In 2022 China Space Station (CSS) will be equipped with atomic clocks and optical clocks with stabilities of $2 \times 10^{-16}$ and $8 \times 10^{-18}$, respectively, which provides an excellent opportunity to test gravitational redshift (GR) with higher accuracy than previous results. Based on high-precise frequency links between CSS and a ground...
Article
Full-text available
Nowadays, Global Geopotential Models (GGMs) can be used as a reference to develop more detailed regional/local geoids, or they can be used to provide geoid heights on their own. Since 2000, several GGMs have been released, and they are mainly derived from satellite gravity measurements, satellite-only models, terrestrial gravimetry, altimeter-deriv...
Conference Paper
According to general relativity theory, a precise clock runs at different rates at positions with different geopotential. Atomic Clock Ensemble in Space (ACES) is a mission using high-performance clocks and links to test fundamental laws of physics in space. The ACES microwave link (MWL) will make the ACES clock signal available to ground laborator...
Conference Paper
Full-text available
According to general relativity theory, a precise clock runs at different rates at positions with different geopotentials. Atomic Clock Ensemble in Space (ACES) is a mission using high-performance clocks and links to test fundamental laws of physics in space. The ACES microwave link (MWL) will make the ACES clock signal available to ground laborato...

Questions

Questions (46)
Question
In an atomic clock: instability in the oscillator and environmental changes can cause frequency drift, although it is often hard to identify between drift and oscillator aging. So, is the frequency drift value constant, linear, or nonlinear variation? If you have any information about this, please post it here.
Question
If the geodetic coordinates (φ,λ,h) of the ground station (e.g., GPS station) is known, how can the pressure, temperature, and relative humidity of this station be predicted at different times?. I'm looking for a mathematical model+modeling data, not instruments (equipment) used. If you have any information about this, please share it here.
Question
In the relativistic theory for synchronization between satellite and ground atomic clocks, the major sources of relativistic effects are relative motion between the two clocks and the movement of clocks in a gravitational potential.
I am looking for the recent research and adapted clock correction models that have been modified on this topic as well as what are factors must be considered when comparing the proper/coordinate time of a clock at rest on the geoid and a clock in Earth orbit satellite?
Question
In common view mode, the ground to ground time transfer by Two- Way satellite Time and Frequency Transfer (TWSTFT), What are the different models which reduces the noise of the space clocks?

Network

Cited By

Projects

Projects (4)
Project
This research aims to utilize the benefits of atomic clocks to develop and Establish a unified height system for Africa AFRUHS.
Project
https://zcyphygeodesy.com/en/ Earth Tide, Load Effects and Deformation Monitoring Computation (ETideLoad4.5) is a large Windows package for scientific computing of geophysical geodetic monitoring, which adopts the scientific uniform numerical standards and analytic compatible geophysical algorithms accurately to compute various tidal and non-tidal effects on various geodetic variations outside the solid Earth, approaches the surface load deformation field and temporal gravity field from heterogeneous geodetic data, and then quantitatively monitors the land water, geological environment and ground stability variations, in order to support the deep fusion of heterogeneous geodetic data and collaborative monitoring of multi-geodetic technologies. ETideLoad4.5 is suitable for senior undergraduates, graduate students, scientific researchers, and engineering technicians in geodesy, geophysical, geoscience, geological environment, hydrodynamics, satellite dynamics, seismology, and geodynamics, which can be employed in the classroom teaching, self-exercise, science research and engineer computing.