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Pre-launch calibration results of the TROPOMI payload on-board the Sentinel-5 Precursor satellite
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Pre-launch calibration results of the TROPOMI payload on-board the Sentinel-5 Precursor satellite
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Pre-launch calibration results of the TROPOMI payload on-board the Sentinel-5 Precursor satellite
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Journal Article
Pre-launch calibration results of the TROPOMI payload on-board the Sentinel-5 Precursor satellite
2018
Overview
The Sentinel-5 Precursor satellite was successfully launched on 13 October 2017, carrying the Tropospheric Monitoring Instrument (TROPOMI) as its single
payload. TROPOMI is the next-generation atmospheric sounding instrument,
continuing the successes of GOME, SCIAMACHY, OMI, and OMPS, with higher
spatial resolution, improved sensitivity, and extended wavelength range. The
instrument contains four spectrometers, divided over two modules sharing a
common telescope, measuring the ultraviolet, visible, near-infrared, and
shortwave infrared reflectance of the Earth. The imaging system enables daily
global coverage using a push-broom configuration, with a spatial resolution
as low as 7×3.5 km2 in nadir from a Sun-synchronous orbit at
824 km and an Equator crossing time of 13:30 local solar time. This article reports the pre-launch calibration status of the TROPOMI payload
as derived from the on-ground calibration effort. Stringent requirements are
imposed on the quality of on-ground calibration in order to match the high
sensitivity of the instrument. A new methodology has been employed during the analysis of the obtained
calibration measurements to ensure the consistency and validity of the
calibration. This was achieved by using the production-grade Level 0 to 1b
data processor in a closed-loop validation set-up. Using this approach the
consistency between the calibration and the L1b product,
as well as confidence in the obtained calibration result, could be established. This article introduces this novel calibration approach and describes all
relevant calibrated instrument properties as they were derived before launch
of the mission. For most of the relevant properties compliance with the
calibration requirements could be established, including the knowledge of the
instrument spectral and spatial response functions. Partial compliance was
established for the straylight correction; especially the
out-of-spectral-band correction for the near-infrared channel needs future validation.
The absolute radiometric calibration of the radiance and irradiance
responsivity is compliant with the high-level mission requirements, but not
with the stricter calibration requirements as the available on-ground
validation shows. The relative radiometric calibration of the Sun port was
non-compliant. The non-compliant subjects will be addressed during the
in-flight commissioning phase in the first 6 months following launch.
