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Design and validation of an adaptive Cubesat transmitter system using a Thermal Vacuum Chamber (TVAC)

Jaswar, Fitri Dewi and Abd. Rahman, Tharek and Ahmad, Yasser Asrul (2019) Design and validation of an adaptive Cubesat transmitter system using a Thermal Vacuum Chamber (TVAC). International Journal of Recent Technology and Engineering (IJRTE), 8 (3S2). pp. 207-212. ISSN 2277-3878

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Abstract

CubeSat in a low earth orbit primarily uses a UHF transmitter with a fixed RF output power. In this paper, the design of the CubeSat transmitter with adaptive power controlability is presented. The design drive is to optimise the SNR and overcome the variability of the propagation path length due to different ground station elevation angles by adjusting its transmitting power. The TVAC test is conducted to validate the performance of the adaptive function in the transmitter. The TVAC is used to emulate the satellite condition in an outer space environment. Four thermal cycles starting from +60°C to -20°C with less than 10-5Pa pressure condition are employed, which was conducted at the KIT CeNT, Japan. The transmitter was integrated inside the satellite structure as a complete CubeSat system. The output power of the transmitter is tested from 0.5W to 2W based on the proposed satellite adaptive mode. The frequency stability of the transmitter is monitored and complies with an average of 70% below requirement, which is less than 2ppm. The results indicate that the RF output power is adjustable to operate as the proposed CubeSat adaptive transmitter in a thermal vacuum condition, which was first developed in Malaysia.

Item Type: Article (Journal)
Additional Information: 7339/76664
Uncontrolled Keywords: Adaptive system, low earth orbit satellites, UHF communication, CubeSat, transmitter.
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK5101 Telecommunication. Including telegraphy, radio, radar, television
T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK7800 Electronics. Computer engineering. Computer hardware. Photoelectronic devices
T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK7800 Electronics. Computer engineering. Computer hardware. Photoelectronic devices > TK7885 Computer engineering
T Technology > TL Motor vehicles. Aeronautics. Astronautics > TL787 Astronautics
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button): Kulliyyah of Engineering > Department of Electrical and Computer Engineering
Kulliyyah of Engineering
Depositing User: Yasser Asrul Ahmad
Date Deposited: 10 Dec 2019 11:35
Last Modified: 10 Dec 2019 11:35
URI: http://irep.iium.edu.my/id/eprint/76664

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