General constraints on influential error sources for super-high accuracy star tracker
Instrumentation and Methods for Astrophysics
2020-10-21 v1 Instrumentation and Detectors
Abstract
Though in-orbit calibration is adopted to reduce position error of individual star spot down to 0.02pixel on star tracker, little study has been conducted on the accuracy to what extent for some significant error sources which often leads to in-orbit correction inefficiency. This study presents the general theory and estimates of the minimum error constraints, including not only on position but also on intensity and scale of Gaussian shaped profile based on Cramer Rao Lower Bound(CRLB) theory. By imposing those constraints on motion, drift in focal length and so on, margins of in-flight error sources and the final accuracy of star tracker can be analytically determined before launch.
Keywords
Cite
@article{arxiv.1505.03416,
title = {General constraints on influential error sources for super-high accuracy star tracker},
author = {J. Zhang and Y. C. Hao and L. Wang and Y. Long},
journal= {arXiv preprint arXiv:1505.03416},
year = {2020}
}
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4 pages