space policy
Leila Mohammadi; Parvin Sojoodi; Mohammad Bod; saeed sheikhzadeh
Volume 16, Issue 4 , December 2023, , Pages 29-40
Abstract
The national information network is being implemented with the aim of providing the services needed by the people through internal infrastructure and independent of international internet platforms. Considering the geographical diversity of the country and in order to increase the reliability coefficient ...
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The national information network is being implemented with the aim of providing the services needed by the people through internal infrastructure and independent of international internet platforms. Considering the geographical diversity of the country and in order to increase the reliability coefficient and access penetration coefficient in the national information network and also due to the needs of future services, it is not possible to rely solely on fiber and the use of satellite communications will be unavoidable. At present, satellite communication has not reached a worthy position in the country's communication network and is limited to some applications such as banking, oil and gas etc. However, due to the development of broadband networks and the increasing need for high-speed data transmission and the increase in data volume, as well as creating social justice and increasing the speed of access, as well as the Internet penetration rate in the country in order to access various services, it is necessary to develop satellite communications to should be taken seriously. In this regard, an analysis of the market of several categories of services in Iran has been done so that the amount of gap in the amount of service provision and the amount of need to receive services can be seen.
investigating space radiation
Roghieh Karimzadeh Baee; Hamideh Daneshvar; Amir Hossin Ahmadi; Parvin Sojoodi
Volume 16, Issue 1 , March 2023, , Pages 59-74
Abstract
With the advent of GaN technology, achieving microwave power with high efficiency by solid-state devices has become more available. Therefore, the use of SSPA amplifiers with GaN technology in satellites, especially LEO satellites, has been considered. space radiation can affect the performance and reliability ...
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With the advent of GaN technology, achieving microwave power with high efficiency by solid-state devices has become more available. Therefore, the use of SSPA amplifiers with GaN technology in satellites, especially LEO satellites, has been considered. space radiation can affect the performance and reliability of components in space systems, which needs to be investigated. One of the most important technologies that can be affected by radiation effects is GaN transistors. In this paper, the effect of TID on GaN transistors in the SSPA amplifier board is investigated. Since commercial components have been used in the engineering sample of the SSPA amplifier and the calculations obtained from the RDM estimates under the worst conditions show that it is necessary to conduct a test for these components, the radiation resistance test was performed for this amplifier. The results of the test conducted in this article show that the SSPA GaN board has radiation tolerance up to a dose of approximately 16 krad. Therefore, mismatched GaN transistors are resistant up to this amount of dose. This is while the sequencer board actually has less tolerance than 5.5 krad
