Flight Software For The High Resolution Spectrograph

S. Ira Becker

doi:10.1117/12.966175

9 January 1984 Flight Software For The High Resolution Spectrograph

S. Ira Becker

Proceedings Volume 0445, Instrumentation in Astronomy V; (1984) https://doi.org/10.1117/12.966175
Event: 1983 Astronomy Conferences, 1983, London, United Kingdom

Abstract

The Flight Software for the High Resolution Spectrograph (HRS) for the Space Telescope (ST) has several diverse requirements. The Flight Software must be able to process observation descriptions and command the HRS through 12 to 24 hours of sustained autonomous operation, as well as being able to respond to near real-time interaction with astronomers on the ground. The HRS Flight Software target acquisition algorithms can begin execution after the ST is pointed at the target's nominal position. Using a plane mirror, or a low-order diffraction grating as a plane mirror, a star-presence check is conducted using a frame of data acquired through the HRS instrument. If the flux does not fall within user-prescribed limits, a search in an outward-growing spiral pattern is generated by requesting small-angle maneuvers of the ST. Star field maps of the successive fields-of-view may be generated and downlinked, and any target found can be precisely centered in either the large (200 micron square) aperture or the small (50 micron square) aperture. Once a target has been acquired, and the appropriate grating on the grating carrousel has been rotated into position, science data can be taken through either of two detectors. Incoming frames of science data, at rates up to 5 per second, are checked for data quality and co-added and stored on-board. The growing accumulation of data are subjected to exposure control, and the detector deflections which accompany each request for a new frame of science data are corrected for doppler shifts. When an observation is completed, all co-added on-board data are dumped to the ground or to an on-board tape recorder, before the Flight Software automatically begins the next observation.

Citation Download Citation

S. Ira Becker "Flight Software For The High Resolution Spectrograph", Proc. SPIE 0445, Instrumentation in Astronomy V, (9 January 1984); https://doi.org/10.1117/12.966175

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KEYWORDS

Target acquisition

Diodes

Sensors

Doppler effect

Data acquisition

Lamps

Spectrographs

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