ALOS Data Users Handbook

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Section 3 Outline of ALOS Satellite SystemTable 3.2-16 LSSR Main CharacteristicsItemRecorder TypeRecording CapacityRecording RateReproducing RateNumber of ChannelsCharacteristicsSolid State Data RecorderPartition 1 0.5Gbit (BOL)Partition 2 0.5Gbit (BOL)Slower than 40Kbps (Nominal)15Mbps (fastest)Recording 1CH, Reproducing 1CH3.2.3.4 Data Relay Satellite Communication (DRC)Data Relay Satellite Communication (DRC) establishes a communication link with a data relay satellite. Thetarget satellite is DRTS. Mission data are transmitted via Ka-band at following data rates:• For DRTS: 277.52 Msps / 240 Mbps (symbol rate / information rate)DRC also has a function to transmit and receive telemetry and commands of the TT&C system via S-band.3.2.3.5 Direct Transmission (DT)Direct Transmission (DT) carries out a direct transmission to ground stations with one band of X-band at thefollowing data rate:• 138.76 Msps / 120 Mbps (symbol rate / information rate)3-22
ALOS Data Users Handbook3.3 Overview of Spacecraft Bus Instruments3.3.1 Telemetry, Tracking and Command (TT&C)Telemetry, tracking and command subsystem (TT&C) is an instrument to receive command signals from groundstation directly or via DRTS, and to distribute to each subsystem after demodulating and decoding the signals.TT&C also transmits telemetry data of each subsystem directly or via DRTS to the ground station after taking,editing, recording and modulating the data. TT&C has a function to relay ranging signals as well as light loadmode function and autonomous/automatic function.For the first time as Earth observation satellites developed by JAXA, A CCSDS protocol is used for TT&C, andstandard of MIL-1553B is adopted for databus.3.3.2 Electrical Power Subsystem (EPS)The important jobs of ALOS's EPS are to accept the electrical power as much as 7,000W generated by SolarArray Paddle (PDL) at the dayside orbit, to provide that electrical power to ALOS's components, and to chargeBatteries (BAT) for use at the nightside orbit.Other jobs of EPS are electrical power suppliment for deployment of PDL, PALSAR and DRC antenna afterALOS - H-IIA separation, electrical and thermal maintenance of BAT, and electrical protection of ALOS'scomponents against excess current generated on PDL.EPS consists of the following components:• Power Control Unit (PCU)• Battery Charge Control Unit (BCCU)• Battery (BAT)• Ordnance Controller (ODC)• Reconditioning Load (RCL)• Shunt Dissipater (SHNT)3-23
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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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