Accession Number : ADA514345


Title :   Development of Star Tracker System for Accurate Estimation of Spacecraft Attitude


Descriptive Note : Master's thesis


Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA


Personal Author(s) : Tappe, Jack A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a514345.pdf


Report Date : Dec 2009


Pagination or Media Count : 108


Abstract : This thesis researches different star pattern recognition and attitude determination algorithms for a three-axis rotational spacecraft. A simulated star field will be suspended above the experimental Three-Axis Spacecraft simulator to provide a reference for the star-pattern recognition algorithms. A star field inertial reference frame database of stars will be developed with the simulator at zero attitude. The angle, planar triangle, and spherical triangle star pattern recognition algorithms will then be used to identify which stars are within a camera's field of vision. The imaged stars will then be matched up to the corresponding stars within the test bed database. With the imaged stars identified and the corresponding inertial frame reference data, the test bed's attitude will be determined using the least-squares, TRIAD, and Quaternion Estimator (QUEST) attitude determination algorithms. On the three axis simulator, an iterative algorithm is developed to demonstrate increasing star tracker accuracy with each updated A matrix.


Descriptors :   *ATTITUDE(INCLINATION) , *SPACECRAFT , *PATTERN RECOGNITION , *ESTIMATES , ACCURACY , THESES , PLANAR STRUCTURES , CAMERAS , VISION , INERTIAL SYSTEMS , ITERATIONS , DETERMINATION , TEST BEDS , SIMULATION , STAR TRACKERS , DATA BASES , ALGORITHMS


Subject Categories : Aerodynamics
      Economics and Cost Analysis
      Unmanned Spacecraft


Distribution Statement : APPROVED FOR PUBLIC RELEASE