NDLI: Feasibility study on thermal survivability of X-band subsystem on RASAT microsatellite

Content Provider	IEEE Xplore Digital Library
Author	Okan, A.
Copyright Year	2005
Description	Author affiliation: Satellite Technol. Group, TUBITAK BILTEN, Ankara, Turkey (Okan, A.)
Abstract	After the launch and commissioning of the first Turkish remote sensing satellite BILSAT-1, TUBITAK BILTEN has initiated the RASAT microsatellite project. RASAT will be a remote sensing microsatellite at low Earth orbit (LEO), with a mass of around 100 kg and an orbital average power of 38W. RASAT is planned to be launched in 2007 and will be the first satellite to be designed and manufactured entirely in Turkey. The main objective of RASAT is to perform Earth-observation using a 5- to 8-meter-resolution imager. In addition to its imaging capability, RASAT will be a platform to demonstrate current technologies using experimental payloads. Small satellites used for Earth-observation require high data transfer rates and one of the experimental payloads in RASAT is an X-Band communication subsystem intended to meet this requirement for future projects. X-band subsystem power amplifier has the overall efficiency of about 26%. Therefore, it will dissipate about 20W during data transfer and thermal issues will become important both at system and at subsystem level. As the mission analyses of RASAT have not yet been concluded, in this paper, the thermal environment and survivability of the X-Band subsystem in orbit is investigated under many uncertainties: the minimum and maximum temperatures for RASAT have been defined for LEO, the X-Band subsystem is assumed to be placed in three nano-trays and for critical nano-trays a robust thermal-mathematical model has been created for hot-case analyses. Transient and steady state temperatures of the critical components have been calculated, and the steady state temperature distribution of the PCB has been estimated. Calculations have Indicated that the components on X-Band modules do not exceed upper temperature limits in RASAT and a passive thermal control method is still feasible for a system dissipating such high power.
Starting Page	223
Ending Page	227
File Size	856337
Page Count	5
File Format	PDF
ISBN	0780389778
DOI	10.1109/RAST.2005.1512566
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-06-09
Publisher Place	Turkey
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Temperature distribution Artificial satellites Uncertainty Low earth orbit satellites Power amplifiers Robustness Steady-state Manufacturing Remote sensing Payloads
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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