communications
Pedram Hajipour; Hossein Eftekhari; Ali Kheirdoost; Hassan Yeganeh
Articles in Press, Accepted Manuscript, Available Online from 03 March 2024
Abstract
Satellite constellations include a set of similar satellites that are distributed in a specific orbital pattern to accomplish a common mission. Satellite constellations are commonly used to accomplish missions such as global telecommunications, global positioning, and remote sensing. In this article, ...
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Satellite constellations include a set of similar satellites that are distributed in a specific orbital pattern to accomplish a common mission. Satellite constellations are commonly used to accomplish missions such as global telecommunications, global positioning, and remote sensing. In this article, by using scientometric approach, the structure and scientific maps of the field of "satellite constellations" in the world, as well as two leading countries, including the United States and China, have been analyzed based on research documents published in this field. In addition, a comparison has been made between these two countries with the world. The research community includes all scientific documents in the field of "satellite constellations" that have been indexed in the "Scopus" database between 1969 and 2023 AD. Also, in this article, knowledge maps (thematic subfields) and international cooperation maps of countries have been drawn using Bibexcel and VOSViewer software.
investigating space radiation
Pedram Hajipour; Leila mohammadi; Azam Eidi; Sara Shoorian; Nahid Eidi Esfiani; Seyed Amir Hossein Feghhi
Volume 16, Issue 4 , December 2023, , Pages 15-27
Abstract
One of the damaging factors for the proper functioning of telecommunication payloads are high energy ionizing particles in space, which the use of proper shield is a way to deal with it. In the design of protection, several factors, such as the type of part and the amount of weight acceptable for the ...
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One of the damaging factors for the proper functioning of telecommunication payloads are high energy ionizing particles in space, which the use of proper shield is a way to deal with it. In the design of protection, several factors, such as the type of part and the amount of weight acceptable for the payload.etc.must be taken into consideration. In recent years, in order to reduce the costs of construction and launch, the use of non-space components has been favored.Therefore, the use of shields with the suitable material in with radiation resistance, with respect to the weight budget considerations, will be one of the important challenges .In this paper, the aim is to investigate the methods of reducing the weight budget considering with respect to the radiation damage of ionizing dose. In this regard, a five-year technology development mission in the GEO orbit has been predicted, and the results of simulations and testing of aluminum and polyethylene shielding to check ionizing dose damage, according to the initial and reference weight budget, have been presented and compared. The analysis and evaluation of the test results using polyethylene protection shows a 17.21 percentage reduction between the two external and internal radiation meters.
Space Ground Segment: receiving, transmitting, controlling and data processing
Roghayeh Doost; Saber Shahidzadeh; Roghieh Karimzadeh Baee; Pedram Hajipour
Volume 16, Issue 3 , September 2023, , Pages 1-14
Abstract
Aeronautical-ESIM (A-ESIM) provides a satellite broadband service for aircraft occupants. Due to the frequency sharing of Aeronautical-ESIM (A-ESIM) satellite broadband service with previous ones, there is a possibility of its frequency interference on them. According to the resolution WRC 2019, the ...
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Aeronautical-ESIM (A-ESIM) provides a satellite broadband service for aircraft occupants. Due to the frequency sharing of Aeronautical-ESIM (A-ESIM) satellite broadband service with previous ones, there is a possibility of its frequency interference on them. According to the resolution WRC 2019, the A-ESIM frequency interference on co-frequency ground stations must be prevented by observing the Power Flux Density (PFD) mask . However, the approval of the PFD condition fulfillment method has been postponed to the World Radio Communication Conference 2023. In this regard, some countries have simulated and determined the minimum allowable height of A-ESIM from the ground, so that the PFD reached the ground does not exceed the specified mask. In many cases, only limited positions of unauthorized heights will cause the PFD to override the mask. Therefore, in this paper, with a new solution, the authorized and unauthorized positions of A-ESIM are determined at any height less than the minimum allowable height, relative to a fixed ground station. In addition, the unauthorized positions of the A-ESIM in both take-off and landing positions are simulated and determined depending on the slope of the A-ESIM
Space New Technologies
Pedram Hajipour; Roghieh Karimzadeh Baee; Houman Zarrabi; Roghayeh Doost; Leila Mohammadi
Volume 16, Issue 2 , June 2023, , Pages 27-42
Abstract
According to the technical specifications of the future generations of telecommunication (the fifth generation and later), which should provide new services with very high data rates in the minimum time and a wide coverage, as well as the exponential increase in traffic, the use of combined space-air ...
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According to the technical specifications of the future generations of telecommunication (the fifth generation and later), which should provide new services with very high data rates in the minimum time and a wide coverage, as well as the exponential increase in traffic, the use of combined space-air networks Land is essential. It should be noted that the management of this type of combined networks has major challenges in providing such services. Meanwhile, the intelligent management of resources in satellite-based hybrid networks will lead to increased capacity and improved service quality. For this purpose, in this article, a comprehensive review of the use of artificial intelligence in the field of satellite communications will be discussed. In the field of intelligent increase of capacity, various factors such as how to configure the network, how to allocate resources such as spectrum, energy and power will be investigated with consideration of intelligent interference management. Finally, in the field of service quality improvement, factors such as how to model and intelligently predict traffic, as well as how to deal with harmful environmental conditions, will be presented.
investigating space radiation
Hamideh Daneshvar; Azam Eidi; Leila Mohamadi; Reza Omidi; Pedram Hajipour
Volume 14, Issue 4 , December 2021, , Pages 11-23
Abstract
Space radiation can affect the performance and reliability of components in space systems. This paper focuses on the investigation of three types of radiation damage including ionizing dose, displacement damage, and single event damage using OMERE software. Considering the outputs of this software, how ...
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Space radiation can affect the performance and reliability of components in space systems. This paper focuses on the investigation of three types of radiation damage including ionizing dose, displacement damage, and single event damage using OMERE software. Considering the outputs of this software, how to use and use a variety of electronic components with different commercial, military and space grades in LEO and GEO satellites is discussed. These components have the least risk of displacement damage. Mass budget constraints should also be considered when using commercial components in the GEO circuit. The maximum thickness for the safety of components in LEO and GEO circuits is 2.6 mm and 9.5 mm respectively. Given the inability of SEE damage to increase in thickness, the best solution to this damage is to use radiation-resistant solutions, especially software issues.
