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ASAR Validation Review AP and GM Level 0 Product Quality

This article provides an overview of ASAR AP and GM level 0 product quality analysis, including systematic evaluations and detailed analysis through SARCON software. It explores downlink data quality, echo data statistics, and noise measurements to ensure product reliability and accuracy for remote sensing applications.

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ASAR Validation Review AP and GM Level 0 Product Quality

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  1. ASAR Validation Review AP and GM Level 0 Product Quality Birgit SchättlerRemote Sensing Technology InstituteGerman Aerospace Center (DLR)

  2. Overview Objectives and Approach Downlink Data Quality Echo Data Statistics Detailed Analysis of an AP Level 0 Product Detailed Analysis of a GM Level 0 Product Summary and Conclusions

  3. ensure, that ASAR AP and GM level 0 products do not show systematic deficiencies start the quantitative analysis of raw data parameters like echo data statistics, noise measurements, … Objectives

  4. Evaluate systematically and automatically level 1B product annotation parameters related to level 0 product quality (e.g. downlink data quality, echo data statistics, noise measurements ) using a tool incorporated into the PDS functionality not yet available => only restricted systematic analysis possibilities based on CBTS (“Chris Buck Tool Set”) Perform a detailed analysis of selected level 0 products using SARCON, an off-line SAR product quality analysis software Approach

  5. AP systematic analysis based on annotations of 106 products only : 57 APM, 49 APP 18 IS 1 : 1 VH 8 VV VH 9 HV HH, 24 IS 2 : 3 HH 13 VV VH 5 HV HH 3 VV HH 8 IS 3 : 2 VH 6 VV VH 22 IS 4 : 2 VH 4 HH 8 VV VH 8 HV HH 16 IS 5 : 2 VH 6 VV VH 8 HV HH 8 IS 6 : 5 VV VH 3 HV HH 10 IS 7 : 3 VV VH 7 HV HH AP Systematic Analysis

  6. missing range lines detected in 3 products:1 with 7 missing, 2 with 1 missing each product with 7 missing range lines has 2 corrupted auxiliary codes, all other products show no auxiliary code error at all missing lines percentage = 0.00014 % (9 missing out of 6392012) Good downlink data quality can be assumed AP Downlink Data Quality Summary

  7. I and Q Channel Bias

  8. I / Q Channel Standard Deviation

  9. Noise Power Correction Factor

  10. ASA_APH_0PNPDK20021106_094707_000000892011_00022_03583_0043.N1ASA_APH_0PNPDK20021106_094707_000000892011_00022_03583_0043.N1 Netherlands calibration site with transponders in H/V and H/H polarisation, beam IS 6 “nominal timeline anomaly” no anomalies observed Detailed Analysis of an AP IS 2 Product

  11. no missing / erroneous ISPs no missing range lines no errors in analysed auxiliary codes  perfect downlink data quality Downlink Data Quality

  12. initial noise : 8 lines in HV and 8 lines in HH initial calibration sequence : 97 pulses in HV and 97 pulses in HH pre-flight observed anomaly in periodic cycle is now the nominal case handled by PF_ASAR  timeline according to expectation AP Timeline (Initial Cycle)

  13. pre-flight observed 237 echo + 1 cal in HV 237 echo in HH 237 echo in HV 238 echo in HH ----------------------- 238 echo in HV 237 echo + 1 cal in HH 238 echo in HV 238 echo in HH ----------------------- 237 echo + 1 cal in HV 237 echo in HH 237 echo in HV 238 echo in HH ----------------------- . . . . . . AP Timeline (Periodic Cycles) specified 237 echo + 1 cal in HV 238 echo in HH 238 echo in HV 238 echo in HH ----------------------- 238 echo in HV 237 echo + 1 cal in HH 238 echo in HV 238 echo in HH ----------------------- 237 echo + 1 cal in HV 238 echo in HH 238 echo in HV 238 echo in HH ----------------------- . . . . . .

  14. no echo data saturation dynamic range not fully used Q channel Q channel I channel I channel Echo Data Histograms and Statistics HV polarisation I Bias = 0.001730 Q Bias = 0.001793 I Stddev = 0.051607 Q Stddev = 0.051510 IQ Gain imbalance = 1.001875 IQ Non-orthogonality = 0.003519 HH polarisation I Bias = 0.001765 Q Bias = 0.001854 I Stddev = 0.122002 Q Stddev = 0.121865 IQ Gain imbalance = 1.001119 IQ Non-orthogonality = 0.004364

  15. Echo Data Visual Inspection HH HV no anomalies observed

  16. Range-Compressed Data Visual Inspection no anomalies observed HH HV

  17. ASA_GM__0PNPDK20021114_071147_000001062011_00135_03696_0211 in VV polarization region in the north of Russia anomaly observed with instrument characterization file : wrong subsampling factors for beam SS2 … SS5corrected INS file delivered by ESRIN Detailed Analysis of a GM Product

  18. GM1 Product

  19. no missing or erroneous source packet no single error in analysed auxiliary codes (PRI, SWST, SWL, up/down converter, TX pulse length, TX pulse bandwidth, resampling factor)  perfect downlink data quality Downlink Data Quality

  20. no echo data saturation dynamic range not fully used Echo Data Histogram Q I SS1 SS5

  21. Echo Data Statistics swath SS1: I Bias = 0.001516, Q Bias = 0.001479 I Stddev = 0.070892, Q Stddev = 0.070799 IQ Gain imbalance = 1.001307, IQ Non-orthogonality = 0.002945 swath SS5: I Bias = 0.001495, Q Bias = 0.001429 I Stddev = 0.080410, Q Stddev = 0.080333 IQ Gain imbalance = 1.000956, IQ Non-orthogonality = 0.001402

  22. SS1 Echo Data Visual Inspection

  23. Range-Compressed Data Visual Inspection SS1

  24. Initial Calibration Pulses P1 P1A P2 P3 SS1

  25. Periodic Calibration Pulses P1 P1A P2 P3 SS1

  26. Analysed AP and GM level 0 products show a good overall product quality. First AP quantitative measurement results could be obtained, but based on a small variety of products only Only one GM product available Summary and Conclusions (I)

  27. Detailed analysis of selected level 0 products will be done only for “suspicious” products in the future The operational PDS tool for a systematic and automatic parameter evaluation is urgently needed- as indicator for possible anomalies - for further overall quality assessment - for further quantitative measurements Summary and Conclusions (II)

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