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Space Telescope Science Institute Next Generation Space Telescope Mission: by Henry C. Ferguson

By Ferguson, Henry C.

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Book Id: WPLBN0000659890
Format Type: PDF eBook
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Title: Space Telescope Science Institute Next Generation Space Telescope Mission: by Henry C. Ferguson  
Author: Ferguson, Henry C.
Volume:
Language: English
Subject: Government publications, National Aeronautics and Space Administration (U.S.), NASA reference publication
Collections: NASA Publication Collection
Historic
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Publisher: National Aeronautics and Space Administration Publication

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C, F. H. (n.d.). Space Telescope Science Institute Next Generation Space Telescope Mission. Retrieved from http://nationalpubliclibrary.info/


Excerpt
Excerpt: Results of these studies in our report where relevant. For example, the discussion of the event had driven on-board scheduling and the architecture that is envisioned to support it, reflects the work of the Software Operations Working Group, and is included in this document to provide a snapshot of the design concepts currently being considered and how they bear on operations...

Table of Contents
Contents 1 INTRODUCTION..................................................................................................................................6 1.1 SCOPE OF THE OPERATIONS CONCEPT STUDY...........................................................................6 1.2 OVERVIEW OF FINDINGS AND RECOMMENDATIONS ..........................................................................7 1.3 DIFFERENCES BETWEEN NGST AND HST AFFECTING OPERATIONS ...................................8 1.4 STRUCTURE OF THIS DOCUMENT..................................................................................................9 2 APPROACH TO THE DEVELOPMENT OF AN NGST OPERATIONS CONCEPT...10 3 CORE CONCEPT FOR NGST FLIGHT AND GROUND SYSTEMS...............................11 3.1 FLIGHT SOFTWARE ROLE IN OPERATIONS................................................................................12 3.2 STORED AND/OR REAL-TIME CONTROL....................................................................................12 3.3 SEQUENTIAL, RELATIVE TIME OPERATIONS............................................................................13 3.4 PAUSING AND JUMPING ................................................................................................................13 3.5 INSERTION OF ACTIVITIES ............................................................................................................14 3.6 PARALLEL ACTIVITIES..................................................................................................................15 3.7 OBSERVATION PLAN EXECUTIVE ...............................................................................................15 3.8 ONBOARD DATA MANAGEMENT................................................................................................16 3.9 ON-BOARD DATA PROCESSING...................................................................................................17 3.10 OVERVIEW OF YARDSTICK SYSTEM ARCHITECTURE.............................................................18 4 MAJOR ISSUES AFFECTING NGST OPERATIONS............................................................20 4.1 OTA STABILITY AND ALIGNMENT.............................................................................................20 4.2 MOMENTUM MANAGEMENT........................................................................................................22 4.3 GROUND STATIONS AND OPERATIONS ..............................................................................................24 4.4 DATA VOLUME AND DOWNLINK CAPACITY ............................................................................25 4.5 SLEW CHARACTERISTICS..............................................................................................................27 4.6 SOLAR FLARES ...............................................................................................................................28 4.7 SCIENCE INSTRUMENT OPERATIONS..........................................................................................28 4.8 GUIDE STAR ACQUISITIONS AND TRACKING ...........................................................................32 4.9 OBSERVATION STRATEGIES - ROLL FLEXIBILITY ...................................................................33 4.10 OBSERVATION STRATEGIES ? DITHER STRATEGIES...............................................................38 4.11 TIME SCALES, EFFICIENCY AND NUMBER OF TARGETS.........................................................40 5 SCIENCE PROGRAM OPTIONS AND OBSERVING MODELS .......................................42 5.1 SCIENCE PROGRAM MODELS.......................................................................................................42 5.2 OBSERVING MODELS....................................................................................................................45 5.3 PROPOSAL CYCLE MODELS .........................................................................................................51 6 BACKEND SYSTEMS........................................................................................................................52 6.1 PIPELINE PROCESSING...................................................................................................................53 6.2 ARCHIVING.....................................................................................................................................53 6.3 DATA DISTRIBUTION....................................................................................................................54 7 SUMMARY AND ISSUES FOR FUTURE STUDY...................................................................54 8 REFERENCES......................................................................................................................................56 9 ACRONYM LIST.................................................................................................................................57

 

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