Merging calibration data
This procedure explains how to merge data from two separate calibrations using calibration spheres for different frequencies.
Prerequisites
Calibration data set for two calibrations of the same Beam Mode but with different calibration spheres must be available.
Context
A calibration procedure is always performed for one specific beam mode. Using a system calibrated for several frequencies allows the results from different objects to be analysed in a survey. Taking into consideration that each beam mode has up to 45 beams which all must be calibrated carefully it is inevitably an advantage to break the calibration into sub-sets of calibration data which are merged. Improperly calibrated beam modes and frequencies can generate erroneous data that becomes useless or difficult to interpret.
Procedure
1 Select the primary calibration data set.
a Open the Setup menu.
b Select Beam Mode Adm.
Image
Selecting Beam Mode Adm opens the Beam Mode Administration dialog box in edit mode. In edit mode you will be able to edit, create and delete beam modes.
c Select the beam mode you wish to use for the calibration.
The Beam Modes page lists the beam modes that have been created. You can select any beam mode from the list. The Mode Description page displays a short description of the beam mode.
2 Select Edit.
This opens the Beam Mode dialog box for the appropriate beam mode. In edit mode you will be able to edit, create and delete beam modes.
3 Open the Calibration page.
The Calibration page displays all calibration data sets made and a short description of them.
a Select the two calibration data sets to merge.
b Select Apply.
4 Select Merge calibration for 2 spheres.
The Calibration Merge dialog box opens.
Note
In cases where both calibrations contain gain adjust for the same beam, the value from the primary calibration will be used in the resulting, merged calibration data set.
5 Enter the name of the merged calibration data.
6 Select Merge selected calibrations.
7 Select the OK or Apply.
The resulting calibration data set will be stored and the coefficients in the formulas used for processing data will be adjusted.