Abstract's details
The Sentinel-6 (Jason-CS) Poseidon-4 Ground Prototype Processor: Processing Description and Results with ESA simulated Test Data delivered to users
Event: 2014 Ocean Surface Topography Science Team Meeting
Session: Instrument Processing: Measurement and retracking (SAR and LRM)
Presentation type: Oral
Sentinel-6 (Jason-CS) is an operational oceanography programme of two satellites that will ensure continuity to the Jason series of operational missions.
The main payload of the Sentinel-6 (Jason-CS) satellite, Poseidon-4, though having heritage from previous altimeters, will be the first radar altimeter embarked on a satellite that includes improved digital and radio frequency hardware and, in particular, open burst Ku-band pulse transmission. This operation (currently termed the interleaved mode), performs a near continuous transmission of Ku-band pulses, that will allow the simultaneous processing of the measurements to obtain High Resolution along-track (HR or SAR) and Low Resolution along-track (LR or LRM) data. As previous altimeters, the Poseidon-4 transmits C-band pulses in order to retrieve a correction for ionospheric path delay.
isardSAT is responsible for the development of the Ground Prototype Processor for the Poseidon-4. This prototype processes all the chains starting from the Instrument Source Packets, and producing L1A and L1B-S (only for HR processing) and Level 1B (both calibrated LR and HR data processing). The prototype has been verified using simulated data generated by the Sentinel-6 (Jason-CS) mission performance simulator and also using in-orbit CryoSat data adapted in format to Sentinel-6, provided by ESA.
At the end of summer 2014, ESA is planning to deliver a few P4 data produced by the ESTEC Sentinel-6 simulator over ocean, and processed by the P4 GPP, in all L1 data types: L1A HR (or SAR), L1B-S HR (or SAR), L1B HR (or SAR), and L1B LR (or LRM).
This paper will present the Ground Processor Prototype developed for Sentinel-6 (Jason-CS), and the results obtained (including post-processing) of the data delivered by ESA to users. Special attention will be given to the new features of the processing chain compared to previous altimeters. Typical examples concern: the assessment of performance improvement thanks to the interleaved mode; the un-correction of the Range Migration Correction (RMC) performed on-board in order to reduce the data rate; the Doppler ambiguity effects, due to the low PRF, onto the geophysical retrievals; the weighting applied to the Doppler beams before the multi-looking to correct the different echo shapes as a function of the incidence angle; or the reconstruction of the waveform scaling factor in order to be able to compute the surface backscatter.
The main payload of the Sentinel-6 (Jason-CS) satellite, Poseidon-4, though having heritage from previous altimeters, will be the first radar altimeter embarked on a satellite that includes improved digital and radio frequency hardware and, in particular, open burst Ku-band pulse transmission. This operation (currently termed the interleaved mode), performs a near continuous transmission of Ku-band pulses, that will allow the simultaneous processing of the measurements to obtain High Resolution along-track (HR or SAR) and Low Resolution along-track (LR or LRM) data. As previous altimeters, the Poseidon-4 transmits C-band pulses in order to retrieve a correction for ionospheric path delay.
isardSAT is responsible for the development of the Ground Prototype Processor for the Poseidon-4. This prototype processes all the chains starting from the Instrument Source Packets, and producing L1A and L1B-S (only for HR processing) and Level 1B (both calibrated LR and HR data processing). The prototype has been verified using simulated data generated by the Sentinel-6 (Jason-CS) mission performance simulator and also using in-orbit CryoSat data adapted in format to Sentinel-6, provided by ESA.
At the end of summer 2014, ESA is planning to deliver a few P4 data produced by the ESTEC Sentinel-6 simulator over ocean, and processed by the P4 GPP, in all L1 data types: L1A HR (or SAR), L1B-S HR (or SAR), L1B HR (or SAR), and L1B LR (or LRM).
This paper will present the Ground Processor Prototype developed for Sentinel-6 (Jason-CS), and the results obtained (including post-processing) of the data delivered by ESA to users. Special attention will be given to the new features of the processing chain compared to previous altimeters. Typical examples concern: the assessment of performance improvement thanks to the interleaved mode; the un-correction of the Range Migration Correction (RMC) performed on-board in order to reduce the data rate; the Doppler ambiguity effects, due to the low PRF, onto the geophysical retrievals; the weighting applied to the Doppler beams before the multi-looking to correct the different echo shapes as a function of the incidence angle; or the reconstruction of the waveform scaling factor in order to be able to compute the surface backscatter.
Contribution: 28Ball1615-7_isardSAT_S6_P4_GPP_OSTST_20141027.pptx.pdf (pdf, 4997 ko)
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