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Instrument Performance

Instrument Performance. Early In-Flight (Re-)Characterization & Calibration. MIPAS In-Flight Characterization and Calibration Plan (PO-TN-BOM-GS-0013) Test Descriptions and Objectives, Needed Input Data and Processing Part of Overall MIPAS Plan PO-PL-ESA-GS-1124 Tools

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Instrument Performance

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  1. Instrument Performance

  2. Early In-Flight (Re-)Characterization & Calibration • MIPAS In-Flight Characterization and Calibration Plan (PO-TN-BOM-GS-0013) • Test Descriptions and Objectives, Needed Input Data and Processing • Part of Overall MIPAS Plan PO-PL-ESA-GS-1124 • Tools • MIPAS Calibration Processor (MICAL) • MIPAS Ground Segment Level 1B Prototype (MIGSP) • DADiSP • MIPAS CalVal Report (PO-RP-BOM-GS-0033) • Summary of Results for all Tests with Detailed Information in Annexes.

  3. MIPAS In-Flight Characterization & Calibration Plan

  4. MIPAS Calibration Processor (MICAL) • Software intended to aid in the calibration and verification of the MIPAS instrument. • It will interface mainly with the IECF exchanging data. • It is intended to MIPAS instrument expert.

  5. Radiometric Performance

  6. IF10 In-Flight NESR0 Verification [1/2] • NESR0 In-Flight Similar to the One On-Ground for Hot Case

  7. IF10 In-Flight NESR0 Verification [2/2] • Meets Requirement Except for Aliasing Spikes and at the Edges • Aliasing Spikes due to Truncation During On-board SPE Filtering • Drop of Optical Transmission of BS Substrates Toward Low Frequencies • No Sharp Optical High Frequency Cutoff and D2 Detector Poor Performance

  8. CC_13 NESRT Reported in Level 1B vs Altitude MIPAS NESRT Orbit 2081 (High Resolution Calibrated Spectrum) 1.0E-07 • Aliasing Spikes are Spread because of Averaging Made over Wavenumbers • Over Estimation due to Residual Phase Error in Imaginary Part • Will Be Corrected in Level 1B Processor 0 - 9 Km 21 - 24 Km 36 - 39 Km cm) 68 - 75 Km -1 sr -2 1.0E-08 NESR (W cm 1.0E-09 500 1000 1500 2000 2500 Wavenumber (cm ) -1

  9. IF11 High Resolution Features Verification • Verify the absence of features due to intrinsic characteristics of the interferometer blackbody and system self-emission for resolution finer than that used during characterization for radiometric calibration. Radiometric Error Band D (Worse Case) Gain and Offset • Spectral features generate radiometric errors that are below the required threshold (NESR0). Low resolution data can thus be used for calibration.

  10. IF3 Aliasing Verification • The long-term drift of the laser sampling frequency may render the numerical filter out of specification. Aliasing would then reduce the radiometric accuracy. Band D • The test was not performed on ground for the FM instrument, the results cannot be compared for FM. The aliasing verification behavior is similar to what was observed for the EQM instrument. • The radiometric errors due to aliasing are below 0.1% for channels/bands A1, A2, AB, B, C and 2% for band D.

  11. IF4 Detector Non-Linearity Characterization • Photo-conductive detectors A1, A2, B1 and B2 cause large radiometric error, e.g., more than 19 % in channel A2. • A correction is applied in the Level 1B processor and needs a characterization of a non-linearity correction factor vs photon flux. • The photon flux is estimated from ADC max and min values. • Characterization was done with blackbody measurements • On-ground for temperature ranging from 180-240K • In-flight for temperature ranging from 229-246K • In-flight range is limited because the blackbody cannot be cooled.

  12. IF4 Detector Non-Linearity Characterization • In-flight characterization done for reverse and forward direction because of differences observed in the photon flux estimator ADC max and min. • With in-flight characterization, for blackbody radiance between 229 and 246K, the radiometric error observed is 0.3%. • For lower radiance, an extrapolation is made and error need to be investigated. • Use on-ground characterization for the time being. DS 180K 229K 246K

  13. IF8 Radiometric Gain Scenario Verification • Current Baseline is to Have a New Gain Every 7 Days

  14. IF8 Radiometric Gain Scenario Verification • Meet Radiometric Accuracy Requirement

  15. AX_1_1 Offset Orbital Variation • Current Baseline is to Have a New Offset Every ~ 375 sec

  16. Remaining Work • Finalize Optimization of Level 1B Processor Input Parameters (PS_1_1 to PS_1_5, AX_1_2 and AX_1_4) • Investigate More Deeply • Gain Variation • Non-Linearity

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