ALOS Data Users Handbook

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Section 3 Outline of ALOS Satellite System3.2.3.1 Data Compression (DC)Data Compression (DC) functions to compress mission data of PRISM and AVNIR-2. PRISM data iscompressed by an irreversible compression with a compression rate of 1/4.5 or 1/9 as shown in Table 3.2-12.Table 3.2-12 Data Compression of PRISM DataInstrumentPRISMData rate beforecompression960Mbps(320Mbps x 3 systems)Compression rate1/4.51/9Data rate aftercompression240Mbps(80Mbps x 3 systems)120Mbps(40Mbps x 3 systems)ReversibilityIrreversibleIrreversibleAVNIR-2 data is compressed by a reversible compression with a compression rate of 3/4 as shown in Table3.2-13.Table 3.2-13 Data Compression of AVNIR-2 DataInstrumentAVNIR-2Data rate beforecompression160Mbps(40Mbps x 4 bands)Compression rate3/4Data rate aftercompression120Mbps(30Mbps x 4 systems)ReversibilityReversible3.2.3.2 Mission Data Coding (MDC)MDC functions to multiplex mission data and other telemetry data. The Earth observation mission instrumentdata processed at MDC are shown in Table 3.2-14.Table 3.2-14 Mission Data Processed at MDCInstrumentPRISMCompressed DataAVNIR-2Compressed DataPALSARData1/4.5 compressed :240Mbps (80Mbps x 3 systems)1/9 compressed :120Mbps (40Mbps x 3 systems)3/4 compressed :120Mbps240Mbps120MbpsIn addition, the following data are input to MDC as well, and are processed by the VCA service of the CCSDS:• DM Non-compressed Data• STT Raw Data3-20
ALOS Data Users HandbookThe following low rate mission data are multiplexed by the multiplex service.• PRISM Mission Telemetry• PALSAR Mission Telemetry• TEDA Data• AOCS Attitude Data• AOCS STT Data• AOCS GPSR Data• TT&C System TelemetryThe low rate mission data are always recorded at the Low Speed Solid State Recorder (LSSR) for 24 hours, andreproduced during a visible area.The data are output after Reed-Solomon encoding as an error correction encoding. VMD functions to select anoutput system from DRC, DT and MDR, and set the routing.3.2.3.3 Mission Data Recorder (MDR)MDR functions to record and reproduce the data multiplexed at MDC. There are two types of recorder in MDR:HSSR for recording high rate mission data and LSSR for recording low rate mission data over 24 hours. Themain characteristics of HSSR and LSSR are shown in Tables 3.2-15 and 3.2-16 respectively.Table 3.2-15 HSSR Main CharacteristicsItemType of RecorderRecording CapacityRecording RateReproducing RateNumber of ChannelsSimultaneous Recordingand Reproducing Function2CH SimultaneousRecording FunctionCharacteristicsSolid state recorder96Gbyte (EOL, after RS encoding)(Information only: 82Gbyte)360/240/120Mbps (selectable)(240Mbps is the fastest for one channel)240/120Mbps (selectable)Recording 2CH, Reproducing 1CHSimultaneous recording and reproducing is operational up to atotal of 360Mbps(It can be recorded and reproduced at different rates)240Mbps = 120Mbps x 2CH360Mbps = 120Mbps + 240Mbps3-21
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ALOS Data Users HandbookSection 8 D
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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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