ALOS Data Users Handbook

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Section 7 Overview of Processing Algorithms(1) Dual polarization modes in High resolution modeIn HH+HV polarization mode, I and Q data of the HH polarization and I and Q data of the HV polarizationare stored alternately in each frame. These data are separated into two groups; I and Q data of the HHpolarization and I and Q data of the HV polarization, and divided into each polarization data.In VV + VH polarization mode, I and Q data of the VH polarization and I and Q data of the VV polarizationare stored alternately in each frame. These data are separated into two groups like the above; I and Q data ofthe VV polarization and I and Q data of the VH polarization, and divided into each polarization data.(2) Polarimetric modeIn this mode, two different type frames are recorded alternately: one stores receiving data from transmissiondata of H polarization, and other stores receiving data from transmission data of V polarization data.Moreover, I and Q data received in the H polarization and I and Q data received in the V polarization arestored in each frame alternately. And these data are divided into each polarization data; the HH polarization,the HV polarization, the VH polarization, the VV polarization.7.3.1.5 CEOS Format Generation ProcessingThe PALSAR level 1.0 data format is based on the CEOS format.The PALSAR level 1.0 data set consists of four different files; volume directory, SAR leader, SAR image andSAR trailer, as shown in Table 7.3-2. The SAR image file consists of SAR image file of each separatedpolarization data.In this processing, the data which were unpacked and performed the data split processing (if necessary) arestored in the SAR image file, and the SAR leader file is generated from high precision position data,PALSARlow-rate mission data, etc. If there are no high precision position data, platform position data is generatedfrom predict position data. Attitude data is extracted from the PALSAR mission telemetry data.7-24
ALOS Data Users HandbookTable 7.3-2 Record Construction of CEOS FormatRecord No. Record length Number of records Record name File name1 360 1 Volume descriptor2 360 Number of polarization+2 File pointer Volume directory3 360 1 Text record4 720 1 File descriptor5 4,096 1 Data set summary6 4,680 1 Platform position data7 8,192 1 Attitude dataSAR leader9 13,212 1 Calibration Data10 Variable length* 10 Facility related data11 720 1 File descriptor12 Variable length n Signal dataSAR image13 720 1File descriptorSAR trailerSAR trailer*: Record lengths among the 10 records of Facility related data are different, but each record has fixed length.7-25
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ALOS Data Users HandbookSection 1 I
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Section 3 Outline of ALOS Satellite
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Section 4 Overview of ALOS Mission
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