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Chapter 2
MIPAS Products and Algorithms
2.1 Introduction
MIPAS is a Fourier transform
spectrometer. It is an interferometric instrument that
measures interferograms. The interferograms
have to be transformed in calibrated spectra of atmospheric spectral radiance. The spectra can
then be fed to various inversion models to compute
vertical profiles of atmospheric molecules. From the
most raw interferograms to the final atmospheric
profiles, there is series of necessary processing
steps. These steps are described in the following
sections.
The processing is separated in two
major parts: space segment and ground segment
processing. Space segment is performed in space, it
includes generation of the data by the instrument and
its subsystems, onboard processing, transmission to the
spacecraft and transmission to the ground. Ground
segment includes reception and decoding of the data and
processing into higher level data products. The ground
segment is divided into two major processing phases: level 1b and level 2 processing. The goal of
level 1b processing is to decode the instrument
source packets and transform them into calibrated and
geolocated spectra of atmospheric radiance. The goal of
the level 2 processing is to transform the spectra
generated by the level 1 b processing into vertical
profiles of concentration of various atmospheric
molecules.
The following flowchart
illustrates the flow of data processing:
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| Figure 2.1 Data processing flowchart for MIPAS. |
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Keywords: ESA European
Space Agency - Agence spatiale europeenne,
observation de la terre, earth observation,
satellite remote sensing,
teledetection, geophysique, altimetrie, radar,
chimique atmospherique, geophysics, altimetry, radar,
atmospheric chemistry
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