Paper
9 August 2016 Gaia challenging performances verification: combination of spacecraft models and test results
Eric Ecale, Frédéric Faye, François Chassat
Author Affiliations +
Abstract
To achieve the ambitious scientific objectives of the Gaia mission, extremely stringent performance requirements have been given to the spacecraft contractor (Airbus Defence and Space). For a set of those key-performance requirements (e.g. end-of-mission parallax, maximum detectable magnitude, maximum sky density or attitude control system stability), this paper describes how they are engineered during the whole spacecraft development process, with a focus on the end-to-end performance verification. As far as possible, performances are usually verified by end-to-end tests onground (i.e. before launch). However, the challenging Gaia requirements are not verifiable by such a strategy, principally because no test facility exists to reproduce the expected flight conditions. The Gaia performance verification strategy is therefore based on a mix between analyses (based on spacecraft models) and tests (used to directly feed the models or to correlate them). Emphasis is placed on how to maximize the test contribution to performance verification while keeping the test feasible within an affordable effort. In particular, the paper highlights the contribution of the Gaia Payload Module Thermal Vacuum test to the performance verification before launch. Eventually, an overview of the in-flight payload calibration and in-flight performance verification is provided.
© (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Eric Ecale, Frédéric Faye, and François Chassat "Gaia challenging performances verification: combination of spacecraft models and test results", Proc. SPIE 9911, Modeling, Systems Engineering, and Project Management for Astronomy VII, 991107 (9 August 2016); https://doi.org/10.1117/12.2235344
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Cited by 1 scholarly publication.
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KEYWORDS
Stars

Space operations

Monte Carlo methods

Telescopes

Performance modeling

Error analysis

Mirrors

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