Page 1 ASAR Validation Review - ESRIN – December 2002 ASAR Validation Review Introduction B. Rosich ESA-ESRIN ASAR C.P. Objectives Challenges in ASAR Cal/Val Strategy History of the C.P. main activities Organisation of the Review

Page 2 ASAR Validation Review - ESRIN – December 2002 Commissioning Phase Objectives Ensure operational stability and instrument performance in ALL modes Verification of in-flight antenna performance Verification of the internal calibration/instrument gain monitoring External Characterisation of the ASAR Antenna Verify the quality requirements for ALL products and tune the processor / instrument settings if necessary Perform the absolute product calibration: Antenna Pattern determination for all 32 beams and Absolute gain calibration for all beams and modes Demonstrate in-flight ASAR multi-mode interferometry and AP capabilities Validate the new wave mode products Establish the activities to be performed during routine phase

Page 3 ASAR Validation Review - ESRIN – December 2002 Challenges in ASAR Instrument Calibration Stability of active phased array 32 transmit/receive beams 5 different operation modes (IM,AP, WS, GM, WV) for science data plus 2 calibration modes (EC, MS) 7 beams (IS1-IS7) for single swath modes: Image, Wave and Alternating Polarization Mode 5 sub-swaths (SS1, IS3-IS6) ScanSAR: Wide Swath and Global Monitoring Mode Complex internal calibration system

Page 4 ASAR Validation Review - ESRIN – December 2002 IMAPWSGMWV ASA_IM__0PASA_AP__0PASA_WS__0PASA_GM__0PASA_WV__0P L0 ASA_IMP_1PASA_APP_1P PRI ASA_IMM_1PASA_APM_1PASA_WSM_1P MR ASA_IM__BPASA_AP__BPASA_WS__BPASA_GM__BP BR ASA_IMG_1PASA_AGP_1P GEC ASA_GM1_1P LR ASA_WVW_2P L2 ASA_IMS_1PASA_APS_1PASA_WVI/S_1P SLC Challenges in ASAR Product Calibration

Page 5 ASAR Validation Review - ESRIN – December 2002 IMAPWSGMWV ASA_IM__0PASA_AP__0PASA_WS__0PASA_GM__0PASA_WV__0P L0 ASA_IMS_1PASA_APS_1P ASA_WVI/S_1P SLC ASA_IMP_1PASA_APP_1P PRI ASA_IMM_1PASA_APM_1PASA_WSM_1P MR ASA_IM__BPASA_AP__BPASA_WS__BPASA_GM__BP BR ASA_IMG_1PASA_AGP_1P GEC ASA_GM1_1P LR ASA_WVW_2P L2 Specan Range Doppler Processing Algorithms

Page 6 ASAR Validation Review - ESRIN – December 2002 Strategy Establish continuous monitoring of the antenna using special calibration modes. Adjustment of Instrument settings / gains Perform basic processor verification and product calibration. Use of calibration sites at different world locations. Peform systematic monitoring of key instrument and product quality parameters Refine/Optimize the Processor and Product quality First priority on IM, WV and WS in VV polarization. Continuation with HH polarization, AP and GM modes. Set-up an efficient team to cover all the aspects of the ASAR cal/val Brazil Radarsat Tr. Las Vegas ASAR Tr. Kiruna GS Bern/Zurich Vietnam Neustrelitz GS Garmisch Rain Forest

Page 7 ASAR Validation Review - ESRIN – December 2002 IMAPWSGMWV ASA_IM__0PASA_AP__0PASA_WS__0PASA_GM__0PASA_WV__0P L0 ASA_IMS_1PASA_APS_1P ASA_WVI/S_1P SLC ASA_IMP_1PASA_APP_1P PRI ASA_IMM_1PASA_APM_1PASA_WSM_1P MR ASA_IM__BPASA_AP__BPASA_WS__BPASA_GM__BP BR ASA_IMG_1PASA_AGP_1P GEC ASA_GM1_1P LR ASA_WVW_2P L2 ECR EVR Product Calibration schedule

Page 8 ASAR Validation Review - ESRIN – December 2002 L PF_ASAR MAY WS Chirp BW increase Patch Large echo shift (I) VV el. antenna Patterns Patch Large echo shift (II) First ASAR interferogram AUG. HH el. antenna patterns IM/AP Chirp BW increase WV patch WSM timeline change Azimuth patterns EC factors for V&H OCT. WV mode gain adj. 1 st K0 issue PF-ASAR Preliminary miss- pointing results APR.JUNE IM/AP gain adj. Patch small echo shift SEP. PF-ASAR 3.01 First IM/WS interferogram NOV. AP SWST change patch PF-ASAR 3.02 VH and HV el. antenna patterns MAR.. 1 st image Check up of all modes First synthesized patterns ScanSAR beam coef. update EVR ECR JUL. 2 nd K0 issue History of the C.P. Main Activities DEC. GM patch PF-ASAR 3.03 Wave level 2 implemented

Page 9 ASAR Validation Review - ESRIN – December 2002 Organisation of the ASAR Validation Review Instrument Status update Processor Verification update Product Verification and Quality for IM, WS, AP, GM Wave Product Validation After the Commissioning Phase. Summary & Conclusions.