4. Data Processing

• 4.1 Processing Overview
• 4.2 Quality Check of the Data
• 4.3 Derive-SPD Processing Steps
  • 4.3.1 Introduction
  • 4.3.2 Construction of ramps and discarding unusable readouts
  • 4.3.3 Conversion of readouts to voltages
  • 4.3.4 Flag saturated ramps
  • 4.3.5 First level deglitching
  • 4.3.6 Extraction of ramp slopes and conversion to photocurrent
  • 4.3.7 Illuminator processing
• 4.4 Auto-Analysis Processing Steps
  • 4.4.1 Absolute responsivity correction and responsivity drift correction
  • 4.4.2 Dark current/background straylight subtraction
  • 4.4.3 Grating scan wavelength calibration
  • 4.4.4 Grating spectral responsivity calibration
  • 4.4.5 Spectral bandwidth correction
  • 4.4.6 Fabry-Pérot scan wavelength calibration
  • 4.4.7 Fabry-Pérot throughput correction
  • 4.4.8 Velocity correction to wavelength
  • 4.4.9 Write LSNR data product (only in OLP versions earlier than 8)
  • 4.4.10 Calculation of uncertainties
• 4.5 Processing of the Parallel and Serendipity Modes
  • 4.5.1 Dark current subtraction and drift removal