Amir Allahvirdi-Zadeh

Amir Allahvirdi-Zadeh
Curtin University · School of Earth and Planetary Sciences

Tracking and Positioning for Formation-Flying of Nanosatellites Using Inter-Satellite Links

About

44
Publications
17,813
Reads
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170
Citations
Citations since 2016
29 Research Items
154 Citations
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2016201720182019202020212022020406080100120
2016201720182019202020212022020406080100120
Introduction
I'm an expert in positioning and navigation using Global Navigation Satellite Systems (GNSS). I'm now a research associate at Curtin University working on the Australian Research Council (ARC) discovery project: "Tracking and Positioning for Formation-Flying of Nanosatellites Using Inter-Satellite Links".
Additional affiliations
August 2019 - November 2020
Curtin University
Position
  • Casual Academic
Description
  • Casual academic, unit: Surveying using GNSS
May 2019 - present
Curtin University
Position
  • PhD Student
Description
  • Working on Precise Orbit Determination of CubeSats.
January 2017 - December 2017
Geographic Organization College
Position
  • Lecturer
Description
  • Teaching the following courses: · Route Surveying · Underground surveying · Surveying I · Surveying II
Education
September 2011 - January 2013
University of Isfahan
Field of study
  • Geodesy
September 2005 - November 2008
Ardestan University
Field of study
  • Surveying Engineering

Publications

Publications (44)
Article
Full-text available
Making use of dual-frequency (DF) global navigation satellite system (GNSS) observations and good dynamic models, the precise orbit determination (POD) for the satellites on low earth orbits has been intensively investigated in the last decades and has achieved an accuracy of centimeters. With the rapidly increasing number of the CubeSat missions i...
Article
Full-text available
For real-time precise orbit determination (POD) of low earth orbit (LEO) satellites, high-accuracy global navigation satellite system (GNSS) orbit and clock products are necessary in real time. Recently, the Japanese multi-GNSS advanced demonstration of orbit and clock analysis precise point positioning (PPP) service and the new generation of the A...
Poster
Full-text available
This poster has been presented at the Scientific Assembly of the International Association of Geodesy (IAG2021) conference has been held from Jun 28 to Jul 02, 2021, in Beijing, China. It is about using a new weighting model based on SIgnal-to-Noise Ratio (SNR) for the precise orbit determination of CubeSats. The related peer-review paper will be...
Article
Full-text available
Precise orbit determination (POD) is the procedure for determining the orbit of a satellite with high accuracy. Compared with global navigation satellite systems (GNSS), the low Earth orbit (LEO) satellites have some different features in space, mainly due to perturbations caused by dynamic forces related to their altitudes. Methods for POD of LEO...
Article
Full-text available
Global Navigation Satellite Systems’ radio occultation (GNSS-RO) provides the upper troposphere-lower stratosphere (UTLS) vertical atmospheric profiles that are complementing radiosonde and reanalysis data. Such data are employed in the numerical weather prediction (NWP) models used to forecast global weather as well as in climate change studies. T...
Conference Paper
Full-text available
Signals from the emerging Low Earth Orbit (LEO) satellites from mega-constellations that broadcast internet, such as Starlink (Space X), OneWeb, Iridium etc., also known as "signals of opportunity" (SOP), can potentially aid positioning. These LEO satellites are approximately 20 times closer to Earth compared to the GNSS medium-earth orbit (MEO) sa...
Presentation
Full-text available
Presented at FIG Congress 2022, 11-15 September 2022, Warsaw, Poland
Presentation
Full-text available
This is the presentation of Milestone 1 (Candidacy) at Curtin University
Presentation
Full-text available
This is the final Presentation of my PhD project.
Chapter
Full-text available
CubeSats can be used for many space missions and Earth science applications if their orbits can be determined precisely. The Precise Orbit Determination (POD) methods are well developed for large LEO satellites during the last two decades. However, CubeSats are built from Commercial Off-The-Shelf (COTS) components and have their own characteristics...
Conference Paper
Full-text available
The use of CubeSats is expanding in space and earth science applications due to the low costs of building and the possibility of launching them in a large low-earth orbits (LEO) constellation. Such constellation can serve as an augmentation system for positioning, navigation and timing. However, real-time precise orbit determination (POD) is still...
Code
The first release of the toolbox is available on my GitHub: https://github.com/AmirAllahvirdi/shadow Feel free to use it! For more information read the release note.
Presentation
Full-text available
CubeSats as small Low Earth Orbiting (LEO) satellites are equipped with space-based receiver and antenna capable of tracking Global Navigation Satellite Systems (GNSS). These GNSS signals provide the possibility of precise orbit determinations (POD) of the CubeSats which is essential for different earth and space science applications. Examples of t...
Presentation
Full-text available
What if we use software-defined radio (SDR) instead of/beside the GNSS receivers onboard the CubeSats?
Presentation
Full-text available
Precise Positioning by smartphones is in the early steps. In this presentation, an overview of this novel subject is discussed and possible future works are introduced.
Chapter
RINEX navigation file is used to determine the location of the satellites. It consists of satellites ephemeris. I explained the details of this file to Iranian students in order to become familiar with this standard format (text in Persian).
Chapter
There are different time systems related to Global Navigation Satellite Systems. I have introduced these systems in this chapter to Iranian students (Text in Persian)
Chapter
RTKLIB is an open-source library for positioning with different methods. Precise Point Positioning is a well-known method for positioning GNSS data. In this chapter from the book "How to use RTKLIB", Precise Point Positioning by RKLIB is discussed in detail. It is in the Persian language since there is not any source for using RTKLIB in Persian. It...
Chapter
RTKLIB is an open-source library for positioning with different methods. GNSS Baseline processing is one of the best methods for positioning GNSS data. In this chapter from the book "How to use RTKLIB?", GNSS Baseline processing using RTKLIB is discussed in detail. It is written in Persian since there is not any source for using RTKLIB in Persian....
Chapter
RTKLIB is an open-source library for positioning with different methods. Single Point Positioning or SPP is one of the simplest methods for positioning GNSS data. In this chapter from the book "How to use RTKLIB", SPP by RKLIB is discussed in detail. It is written in Persian since there is not any source for using RTKLIB in Persian. It is published...
Presentation
Full-text available
It is about IGS and its structure. I introduce data and products that are available through IGS data centers to the SAMT users. SAMT is a Real-Time Kinematic (RTK) service in Tehran. (Text in Persian)
Presentation
Full-text available
"Extraction atmospheric parameters of GPS data" is the title of a workshop I held for the cloud seeding staff and graduate students of the Physics department of Yazd University. It was about how to extract atmospheric parameters from GPS data and services and analyze them to calculate the Predicted Water Vapor (PWV).
Article
Full-text available
GPS draconitic signal (351.6 ± 0.2 days) and its higher harmonics are observed at almost all IGS products such as position time series of IGS permanent stations. Orbital error and multipath are known as two possible sources of these signals. The effect of Earth shadow crossing of GPS satellites is another suspect for this signal. Up to now, there i...
Code
Analysis of Radio Occultation Data with Rom SAF V8 and MATLAB and create related files. It was a part of research with the faculty members of the Physics department of Yazd university.
Code
The Shadow toolbox is a Matlab toolbox that is written for detecting satellites in the shadow of the Earth. The input is a RINEX observation file and the output is the new and refined RINEX observation file excluding the observations of the GNSS satellites at the shadow of the Earth. http://dx.doi.org/10.6084/m9.figshare.19085546.v1
Thesis
Full-text available
Spectral analysis of time series is an important issue in Geodesy. The main purposes of this analysis are detecting periodic behavior and the sources of these behaviors. Periodic signals and their harmonics are causes of reduced accuracy in time series analysis. Therefore these signals should be detected and removed from the results. One of these P...
Presentation
"Collecting and Processing a GNSS network using GNSS receivers" was a workshop that I held at the University of Ardestan. I taught the undergrad students how to collect the required GNSS observations for network processing using GNSS receivers and then how to process them to reach the highest coordinates useful for surveying purposes.
Code
This code gets the total electron content (TEC) files and plots the variation of the TEC map in Matlab.
Code
This code get the precise ephemeris and interpolate the satellite position to the requested time.
Presentation
Full-text available
I introduced the International GNSS Service in the internal students' seminar at the University of Isfahan: The International GNSS Service (IGS) has ensured open access, high-quality GNSS data products since 1994. These products enable access to the definitive global reference frame for scientific, educational, and commercial applications – a tre...
Presentation
Full-text available
I introduced the International Earth Rotation and Reference Systems Service (IERS) at the University of Isfahan: The IERS was established in 1987 by the International Astronomical Union and the International Union of Geodesy and Geophysics. According to the Terms of Reference, the IERS accomplishes its mission through the following components: Tec...
Presentation
Full-text available
I introduced the International Laser Ranging Service (ILRS), its data and products in the internal student's seminar at the University of Isfahan: Satellite Laser Ranging (SLR) and Lunar Laser Ranging (LLR) use short-pulse lasers and state-of-the-art optical receivers and timing electronics to measure the two-way time of flight (and hence distance)...
Presentation
Full-text available
I introduced the international Doris Service in the internal seminars of the University of Isfahan. The Doris system is a french civil precise orbit determination and positioning system. It is based on the principle of the Doppler effect with a transmitting terrestrial beacons network and onboard instruments on the satellite's payload (antenna, ra...
Presentation
Full-text available
In this project, I will demonstrate the process of analyzing GPS time-series data. I have used 10 years of continuous GPS measurements of four stations (ALGO, GRAZ, KOSG, and ONSA) and three different combinations of the noise component of GPS coordinate time-series, i.e., White noise, Flicker noise, and random walk noise. I use Least Squares Varia...
Code
This code get the coordinate in ITRF and convert it to ICRF
Code
This code get the RINEX navigation file and compute the position of satellites in ECEF
Code
This script get the time and convert it to the Julian Date, Modify Julian Date, GPS Week and Day Of Year.
Presentation
Full-text available
The principles of Quality Control and the instructions for using TEQC are discussed.

Network

Cited By

Projects

Projects (10)
Project
Precise Orbit Determination of low-power CubeSats using Software-Defined Radio (SDR) - onboard POD using new multi-GNSS multi-frequency receivers
Project
POD of CubeSats based on GNSS measurements and comprehensive dynamic models and its applications on earth and space science applications. It is my PhD project which is funded by the Australian Research Council (ARC) under the discovery project: Tracking Formation-Flying of Nanosatellites Using Inter-Satellite Links (DP 190102444)
Archived project
Two reports related to GNSS standard formats were created.