DocumentCode :
2173134
Title :
High speed autonomous embedded software for high accuracy star sensors
Author :
Muralidhara, K.R. ; Ashrita, M.S. ; Arpana, A. ; Padmasree, S. ; Srinivas Rao, J. ; Shashikala, T.H. ; Rao, Gottipaty N.
Author_Institution :
Lab. for Electro-Opt. Syst. (LEOS), ISRO, Bangalore, India
fYear :
2013
fDate :
21-23 Sept. 2013
Firstpage :
277
Lastpage :
281
Abstract :
A star sensor is an embedded system used in modern spacecraft for estimating the orientation of the spacecraft. Star trackers capture image of star in the sky, process them and gave highly accurate attitude in all 3 axis. Basically a star tracker is an electronic camera connected to a microcomputer. First generation star trackers are characterized by acquiring and processing few stars information to estimate attitude with limited software modules. The availability of space qualified microcomputers enables generation shift in the star trackers development for attitude determination onboard. Laboratory for Electro-Optics Systems (LEOS) is actively involved in design and development of indigenous star trackers for different ISRO. Current star trackers employs traditional method of acquiring and processing star image and don´t meet the many spacecraft requirements in terms of number of stars tracking, accuracy and update rate. In order to meet the current generation spacecraft requirements, LEOS has designed and developed second generation star trackers which are characterized by low weight, volume and power. These sensors are based on ERC-32 processor, here after referred as Mark-II sensor. The essential features expected from onboard software are robustness in operations, run-time and ability to give solutions especially during satellite injection with high angular rate. This paper presents the details of state-of-art software designed and developed for these star trackers to provide high accuracy and higher bandwidth with existing hardware limitations even with harsh space environment with limited resources and constraints.
Keywords :
aerospace computing; computerised instrumentation; space vehicles; star trackers; ERC-32 processor; Laboratory for Electro-Optics Systems; Mark-II sensor; electronic camera; high speed autonomous embedded software; microcomputer; satellite injection; space qualified microcomputers; spacecraft orientation estimation; star image acquisition; star image processing; star sensor; star trackers; Accuracy; Algorithm design and analysis; Detectors; Estimation; Software; Space vehicles; Processor; Star sensor; Update rate;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Advanced Electronic Systems (ICAES), 2013 International Conference on
Conference_Location :
Pilani
Print_ISBN :
978-1-4799-1439-5
Type :
conf
DOI :
10.1109/ICAES.2013.6659408
Filename :
6659408
Link To Document :
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