NICMOS Design Reference Mission and Command Volume Estimate

Details NICMOS Design Reference Mission and Command Volume Estimate NICMOS Design Reference Mission and Command Volume Estimate

Nov 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995nicm.rept....4b&link_type=abstract

NICMOS Instrument Science Report 95-004, 9 pages

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Hubble Space Telescope, Hst, Space Telescope Science Institute, Nicmos

Scientific paper

We present an estimate of the uplink command volume associated with the NICMOS exposure commanding using the NICMOS Design Reference Mission developed by MacKenty and Kutina (ISR NICMOS-001). Based upon this model of NICMOS usage and a few additional assumptions, it appears that the daily mean command volume will be approximately 412 uplink words/orbit for NICMOS commanding, and the highest command volume will occur for observations of background-limited targets with NICMOS as the prime instrument. In this worst case (120 ACCUM exposures per orbit), we expect a command volume of about 1014 words/orbit, effectively the same as the typically available command volume of ~1100 words/orbit. However, this maximum command volume is expected for only about one orbit per day on average, so it should not represent a serious concern operationally. We find no serious impediments to the HST science program with this level of command volume, even when factoring in the effects of the other SI’s. We also discuss three possible methods of raising the typically available command volume. Overall, these results suggest that the effort expended early in the NICMOS macro activation request development process to minimize the size of the uplinked data structures was successful.

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