ALOS Data Users Handbook

Section 5 ALOS Mission Operationsneeded)• Ocean, etc: Reproduction from HSSRDuring nominal operations, PRISM and AVNIR-2 observe nadir mainly and PALSAR observes at 41.5degrees of off-nadir typically.When disaster monitoring, AVNIR-2 and PALSAR quickly observe target area with the cross track pointingfunction of AVNIR-2 and the variable off-nadir angle function of PALSAR.Table 5.4-1 Basic Operation of each Sensor and HSSRObservation ConditionOutputLandDTX bandHSSRNightOcean DRCDay timeEOC support FGS RecordingtimestationsPRISM x H L H L L L HAVNIR-2 x H L M H M M HPALSAR H M L H L L L* HHSSRH M H H M M L N/AReproducingH: High Priority, M: Mid Priority, L: Low Priority, x: Calibration*: ScanSAR 120Mbps mode and PASAR direct downlink mode are Mid Priority for FGS.Concerning the main three sensors and the HSSR reproduction, the main constraints and conditions aboutparallel operations and routing setting are described below. Table 5.4-2 lists up the data sources and the dataoutput systems.(Source Data)• The three sensors are simultaneously operational.• Two kinds of data rates for one sensor such as 120Mbps and 240Mbps are operational exclusively.• Only the combination of AVNIR-2 and PALSAR (120Mbps) can be multiplexed (output to a 240Mbpsoutput system). But this combination is not used for the routine operation.(HSSR)• HSSR has two channels for recording and one channel for reproducing.• Two-channel simultaneous recording is possible up to 360Mbps, that consists of 240Mbps recordingand 120Mbps recording, or 120Mbps recording for both channels (2 channels x 240Mbps recording isnot possible). But the two channel recording of 120Mbps data is not used for the routine operation.5-4