ICCS07/213

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[edit] System engineering approach toward the problem of battery depth-of-discharge of a LEO satellite

Hossein Bonyan Khamseh, Amirkabir university of technology (AUT)

Abstract

During the last few decades, battery Depth-of-Discharge (DoD) problem has always been a challenging and limiting factor on satellite-mission duration. This paper, from a system engineering point of view, comprehensively describes the power-hungry phases of a typical Low-Earth Orbit (LEO) satellite mission. Theses phases, each by itself or in any combination(s), may lead to high DoD levels during the eclipse phase, which will in turn shorten the mission-life, considerably. To handle the challenge most efficiently, the engineering community has developed three methodologies as:

1- Enlargement of battery capacity and/or utilization of batteries with higher allowed DoD and/or higher power-density

2- Adapting adequate/flexible mission profile(s)

3- Enlargement of solar array area and/or utilization of more efficient solar cells

This paper evaluates each of the preceding strategies by a system engineering approach .i.e.; Direct and potential inter-subsystem effects of each strategy are studied. Finally, it has been highlighted that the final decision on which methodology to follow and the contribution of each methodology to the final approved-strategy can only be made by the means of thorough, comprehensive trade-studies and trade-offs covering all direct and potential inter-subsystem effects described in this paper.

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