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MRTCAL computes one set of calibration products per
chunk. These products are:
- the receiver temperature,
- the calibration temperature,
- the system temperature,
- the precipitable water vapor,
- and the zenithal opacity.
Their exact values are evaluated for the frequency at
the middle of the chunk4.1. The values at other
frequencies in the chunk can be evaluated using one of the two
available modes:
- in the flat mode, the central values are reused over all
the chunk bandwidth.
- the second mode is interpolation. In this case, the
chunks are reordered by ascending frequency, and the values at
non-central frequencies are interpolated between the current chunk
and its nearest neighbour, so that it is computed at the frequency
of the desired channel. This has the advantage to avoid
discontinuities along the whole bandwidth and thus to avoid
calibration platforming. For the two half-chunks at the boundary of
the whole bandwidth, where no neighbour chunk is available, the
values are extrapolated from the boundary chunk and its neighbour on
the other side.
Next: Memory index
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2023-06-01