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Instrument Performance Verification and Optimisation

Instrument Performance Verification and Optimisation. David L. Smith Space Science and Technology Department, CCLRC, Rutherford Appleton Laboratory, Chilton, Didcot OXON, United Kingdom, OX11 OQX. Instrument Performance Verification and Optimisation.

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Instrument Performance Verification and Optimisation

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  1. Instrument Performance Verification and Optimisation David L. Smith Space Science and Technology Department, CCLRC, Rutherford Appleton Laboratory, Chilton, Didcot OXON, United Kingdom, OX11 OQX

  2. Instrument Performance Verification and Optimisation • Overview of instrument and commissioning phase • Functional performance • Thermal, Cooler, Scan Mechanism • Calibration Subsystems • Blackbodies, VISCAL unit, Gain-Offset Loop • Signal Channel Performance • Dynamic Range, Radiometric Noise, Pixel Map Alignment, Low Gain Mode, EMC • Conclusions on instrument performance

  3. AATSR - OVERVIEW • Key Aims • Measurement of global sea-surface temperatures to <0.3K • Global vegetation monitoring • Cloud Properties • Continuation of SST datasets provided by ATSR-1 and ATSR-2 • Thermal IR channels at 12µm, 11µm and 3.7µm • Visible/Near Infrared Channels at 1.6µm, 0.87µm, 0.66µm and 0.56µm

  4. AATSR - SCAN GEOMETRY

  5. Cold Blackbody VISCAL Hot Blackbody AATSR

  6. AATSR Cooler Subsystem • IR detectors are maintained at 80±1K • Cooler subsystem can lift 600mW with a mounting interface temperature of 25°C • Maximum power demand is 53W during cool-down • 4 years design life

  7. Infra-Red Calibration System Blackbodies viewed every scan.

  8. AATSR VISCAL System

  9. AATSR Instrument Modes

  10. AATSR Commissioning • Initial Switch-On • Activate instrument systems in a controlled sequence • Checkout • Verify function of subsystems • Characterise performance • Optimise subsystems • Mechanisms (Cooler, blackbody heaters, scan mechanism) • Pixel Map • Control Loops • Configure for nominal operations

  11. Commissioning Overview

  12. Constraints • ICU switch-on not before L+7 to allow for LEOP and PEB switch-on • Initial cooldown not before L+14 to allow FPA outgassing • First outgassing must start 14 days after start of first cooldown • Visible channel optimisation to be completed before start of cool-down. • Condensation on IR-FPA expected to affect calibration (based on ATSR-2 experience) • Allow 5 days turn-around time for analysis of science data.

  13. Key Dates • 1st March - Launch • 9th March – AATSR ICU ON • 12th March – AATSR to HEATER mode • 15th March - First AATSR science data (Visible Only) • 26th March - 1st Cooldown of IR-FPA and acquisition of first IR science data • 3rd-9th April – Outgassing • 19th May - End of main commissioning phase tests • 24th May – First Validation cruise started • 15-22nd July – Repeat of Cooler Checkout Tests • 16th Sept – End of AATSR commissioning phase

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