Computer Science – Performance
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002iaf..confe.914s&link_type=abstract
IAF abstracts, 34th COSPAR Scientific Assembly, The Second World Space Congress, held 10-19 October, 2002 in Houston, TX, USA.,
Computer Science
Performance
Scientific paper
Speaking of Low Earth Orbit (LEO) satellites like earth observation satellites, the light-weighing and high performance bus system will make an great contribution to mission components development.Also, the rising ratio of payload to total mass will reduce the launch cost.Office of Research and Development in National Space Development Agency of Japan (NASDA) is studying such a sophisticated satellite bus system.The system is expected to consist of the following advanced components and subsystems which in parallel have been developed from the element level by the Office. (a) Attitude control system (ACS) This subsystem will provide function to very accurately determine and control the satellite attitude with a next generation star tracker, a GPS receiver, and the onboard software to achieve this function. (b) Electric power system (EPS) This subsystem will be getting much lighter and powerful by utilizing the more efficient solar battery cell, power MOS FET, and DC/DC converter.Besides, to cumulate and supply the power, the Office will also study a Litium battery for space which is light and small enough to contribute to reducing size and weight of the EPS. (c) Onboard computing system (OCS) This computing system will provide function of high speed processing.The MPU (Multi Processing Unit) cell in the OCS is capable of executing approximately 200 MIPS (Mega Instructions Per Second).The OCS will play an important role not only enough for the ACS to function well but also enough for the image processing data to be handled. (d) Thermal control system (TCS) As a thermal control system, mission-friendly system is under study.A small hybrid fluid thermal control system that the Office is studying with a combination of mechanical pump loop and capillary pump loop will be robust to change of thermal loads and facilitate the system to control the temperature. (e) Communications system (CS) In order to transmit high rate data, the office is studying an optical link system.The optical communications system will provide the much smaller size of component than the microwave, while it simultaneously provides transmission of a quantity of data at a high speed.
Noda Atsushi
Shirai Tatsuya
Tsuiki Atsuo
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