ALOS Data Users Handbook

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Section 3 Outline of ALOS Satellite SystemFigure 3.3-1 Onboard EPS LocationFour sets of Shunt Dissipater (SHNT) are the silver pizza boxes in front on the photo, which convert theexcessive electrical power from PDL to heat and dissipate it into the space. They are placed outside the satellitebody on the PDL side open to the space. Other EPS components are installed inside.ALOS has five sets of NiCd type battery (BAT). BAT is manufactured, tested and then being kept in arefrigerator to avoid specific deterioration. They are installed at the satellite just before the launch operation.NiCd type battery comes not to be able to provide enough current more than a certain level, if discharging andcharging repeatedly at that same level (Memory effect). Reconditioning Load (RCL) is used to force batteriesdischarge more than normal level to avoid this memory effect.Power Control Unit (PCU) manages the efficient charge and discharge procedure between PDL and BAT, andprovides stable voltage of electric current to all ALOS's components. It sends control signals of shunt dissipationto SHNT and control signals of charging current to Battery Charge Control Unit (BCCU), by checking PDL'spower generation and BAT voltage.Battery Charge Control Unit (BCCU) is equipped with each BAT one by one. It actually charges BAT at thedayside orbit and discharge at the nightside orbit, according to the control of PCU. It also protects BAT bystopping charge at high temperature (33 °C) and by heating up BAT in low temperature (2 °C).ALOS's PDL, PALSAR antenna and DRC antenna are folded down at the top seat of rocket in launching. Theyhave to be deployed for working after ALOS's separation from the rocket in the space. Ordnance Controller(ODC) sends the electric current, at this time, from BAT to explosive materials to free them from holding bolts.3-24
ALOS Data Users Handbook3.3.3 Solar Array Paddle (PDL)The Solar Array Paddle (PDL) generates the electrical power for satellite from Sunlight on the orbit.Five minutes after Satellite-Rocket separation, ALOS fires eight separation nuts and stowed solar paddle beginsto deploy by the power of spring. ALOS rotates and tracks its solar paddle to the Sun after stabilization ofsatellite attitude.ALOS's solar paddle is designed to generate over 7,000W at EOL (End of Life), this is the largest power supplypaddle JAXA has ever developed.Figure 3.3-2 ALOS Solar PaddleThe Single paddle composed with nine solar panels is the significant point of ALOS's appearance. Theperformance of solar generators change for the worse when shadow falls on the surface. However ALOS's orbit,called "Sun Synchronous", has a characteristic of fixed sun angle to the orbit plane, ALOS will see the Sun onlyleft side from its flight direction and the solar paddle is installed only the left side.ALOS’s Solar Array Panels (PAD) adopts "Light-Rigid Panel". Aluminum honeycomb are sandwiched bycarbon-fiber reinforced plastics (CFRP), and solar cells are stuck on the one side of this sandwiched panel. Highradiation efficiency adiabators are stuck on the back side of solar panel, and temperatures of panels arecontrolled within appropriate range.ALOS controls its attitude to keep its sensors direct to the earth, and the location of the Sun changes as theALOS rotates on the orbit. To keep maximum efficiency of the paddle, ALOS must rotate the paddle to face itright angle to the Sunlight. The Paddle Drive Mechanism (PDM) is the component installed at the root of thepaddle, and PDM has the function of rotating the paddle and transporting the power from the paddle to ALOS'spower supply systems.3-25
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ALOS Data Users Handbook8.5 Outline
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APPENDIXALOS Data Users Handbook
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Appendix 1 Acronyms and Abbreviatio
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ALOS Data Users HandbookAppendix 2
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