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FGS Instrument Handbook for Cycle 24 |
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Steps 1 and 2 are carried out in calfgsa, while steps 3 and 4 are performed in calfgsb. Please see Figure 7.1 and Figure 7.3, the flow chart descriptions of calfgsa and calfgsb respectively.The astrometer’s data are analyzed to evaluate the background counts, if available (see Chapter 7), and to locate and extract the individual scans. For each scan, the guide star centroids are computed and corrected for differential velocity aberration. Output files are generated with the appropriate information.Transfer mode observations are processed by calfgsa to the point of locating and extracting the individual scans and computing the guide star centroids. Support for additional processing - including the automation of the data quality assessment (identifying those scans which have been unacceptably corrupted by space craft jitter, for example) and the cross correlation and co-adding of the individual scans - are available as data analysis tools. Upgrades to calfgsa will be noted on the FGS Web page. Figure 7.2 displays the processing steps performed by the current version of calfgsa for Transfer mode observations.