ALOS Data Users Handbook

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Section 3 Outline of ALOS Satellite SystemReference Pixel(ground position)Pixel SizeWithin 1 pixel11.5+/-0.3μmMisalignment of each pixel of each bandto reference pixel (ground position)Within 1 pixelFigure 3.4-19 AVNIR-2 Band-to-Band Pixel Misalignment3.4.3 PALSAR Data FormatA maximum of 8ch of 30Mbps data are output from PALSAR. Depending on the observation modes, PALSARhas two kinds of data rates: 240Mbps and 120Mbps. A VCID is assigned to each channel and transmitted toground after being multiplexed at VMD.Figure 3.4-20 shows the data interface of PALSAR.3-48
ALOS Data Users HandbookTelemetryTimeData Processing in PALSARMSBLSBAuxiliary Data30Mbps x 8ch(at 240Mbps)TelemetryPacketFrameFrameFrameFrameFrameFrameFrameFrameAPID: 1589VCDU ID 52VCDU ID 53VCDU ID 54VCDU ID 55VCDU ID 56VCDU ID 57VCDU ID 58VCDU ID 59Figure 3.4-20 PALSAR Data Interface8-bit data for 8ch are assigned in order from MSB. Therefore it is necessary to compose and process eight virtualchannels of data in the data processing at ground.(1) Frame FormatThe frame format is as follows:12345678Sync. CodeSync. CodeSync. CodeSync. CodeSync. CodeSync. CodeSync. CodeSync. CodeFrame NumberAuxiliaryDataObservation DataI Q I Q . . .I QIndefiniteData32 4 100 Variable Variable(a) Sync. Code: 256bits (32bit x 8) The same value is stored in all the channels.FAF33400(11111010111100110011010000000000)(b) Frame Number: 32bits (4bits x 8) counted up from 0 at each input of a PRI Synchronous triggerafter Power ON.(c) Auxiliary Data: 800bits (100bits x 8)(d) Observation Data: Variable length (n bits x 8, ch1: MSB, ch8: LSB)(e) Indefinite Data: Variable lengthThe frame format is different depending on the observation mode.(2) Packet FormatWhen high rate mission data are output from the PALSAR data processing subsystem, the data are packetized bythe VCA service. The packet data format is as follows (example of 5-bit output bits):3-49
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ALOS Data Users HandbookSection 1 I
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ALOS Data Users HandbookSection 8 D
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ALOS Data Users Handbook8.5 Outline
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ALOS Data Users HandbookALOS Centra
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ALOS Data Users Handbook8.7.3 NOTES
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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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