CHAMP ASC/CSC
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Summary
This page contains a calibration parameter file and applications which
can be used to correct Level-2 CHAMP FGM-NEC vector data for
mis-alignments between the star imager and the vector magnetometer.
Contains C-language routines,
callable from Fortran and other languages to read in the parameter file
sca.txt and perform the star imager mis-alignment correction
for Level-2 CHAMP FGM-NEC vector data. Adopted code and a demo script
to call and run this from matlab is provided too.
Applicable on FGM-NEC versions lower then 51 only -- in version 51 the star-imager/vector-magnetometer correction is already done!
Files
| Type | Format | Mbyte | Date | Contents | ||
| Data | Zip | 0.9 |
2010 Nov 5 |
sca-2010-11-05.zip
The file contains the mis-alignment in degrees in NEC coordinates as (MJD, rot-about-x, rot-about-y, rot-about-z, flag). This file will be updated, but not regulary. The name of this file indicates the date of last update. For use with the application code below rename it to 'sca.txt' or customize the filename in the code. |
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| Type | Format | Mbyte | Date | Contents | ||
| C code | ASCII | 0.006 | 2006 May 30 |
sca-corr.c
C source code of a program able to correct Level-2 CHAMP FGM-NEC vector data for mis-alignments between the star imager and the vector magnetometer, using the parameter data file 'sca.txt'. Bug-fix (2006-May-30): An error in the subroutine sca_delaz caused an incomplete correction of the misalignment angles for data at high latitudes. |
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| Type | Format | Mbyte | Date | Contents | ||
| C code | ASCII | 0.008 | 2006 May 30 |
sca_corr_ml.c
This is a slightly variant of the plain-C code version sca_corr.c with an interface function added, prepared to use inside matlab by compiling with the matlab utility mex. The function parameter list differ from the plain-C version. See example batch test.m below for usage in matlab. Bug-fix (2006-May-30): An error in the subroutine sca_delaz caused an incomplete correction of the misalignment angles for data at high latitudes. |
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| matlab code | ASCII | 0.001 | 2004 Jun 22 |
sca_init.m
Simple matlab -only function to read the parameter file sca.txt, replacing the initialization function sca_open found in sca_corr.c. See example batch test.m below for usage. |
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| matlab code | ASCII | 0.001 | 2004 Jun 22 |
test.m
Simple matlab batch showing usage of the mex/matlab application sca_corr_ml.c and sca_init.m. |
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