Dear Jonas,
Some quick feedback, I am on a conference.
The variables that you can retrieve using ARTS-OEM so far are mainly
atmospheric quantities. To handle instrument variables I maonly left for
the future.
A constant frequency switch could be handled by shifting the transitions
as you tried to do. But frequency shifts are in fact an instrument
parameter, and moving the transitions will not work for frequency
stretch. So it seems to be time to implement a general way to handle
instrument variables. I will discuss with Simon, that is also here at
the conference.
For the moment I suggest that you do repeated linear inversions. And
adjusting your instrument frequencies after each linear inversion. This
should work with your extension of xaStandard. After some iterations
turn off the frequency switch and make a final inversion.
Kind regards,
Patrick
On 2018-09-17 17:22, Jonas Hagen wrote:
Hello ARTS Developers,
I'm trying to retrieve the Frequnecy Shift along with Wind with the ARTS
internal retrieval. To my understanding, this should work, but support
in xaStandard and x2artsStandard WSMs is missing and results in an
error: "Found a retrieval quantity that is not yet handled by internal
retrievals: Frequency"
For xaStandard(), the a priori Frequency Shift could easily be set to
zero after line 793 of m_oem.cc along with baseline and pointing.
For x2artsStandard(), maybe a new WSV would make sense (f_shift) and the
inversion_iterate_agenda would then call
abs_linesShiftFrequency(f_shift), similar to the baseline stuff?
I tried to implement it myself but got stuck with jacobian_quantities
and indices in x2artsStandard().
Best regards,
Jonas Hagen
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