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: http://www.stsci.edu/documents/dhb/web/c10_fgsintro.fm5.html
Дата изменения: Tue Nov 18 00:20:15 1997 Дата индексирования: Sat Dec 22 14:57:25 2007 Кодировка: |
In a TRANSFER mode observation the DF 224 computer steps the FGS's IFOV across the photocenter (determined by CoarseTrack) along a diagonal path in detector space for a distance specified in the original proposal. Each sweep across the target is referred to as a scan. After the completion of a given scan, the IFOV reverses direction and scans the object again until the total number of scans specified in the proposal have been completed. Every 25 msec the PMT data and star selector rotation angles are reported in the telemetry. The FGS samples the entire S-curve, which can be reconstructed by post observation data processing.