The purpose of this study is to develop a small-sized on-board GPS receiver that can autonomously provide position, velocity and orbit determination, accurate time synchronization and even attitude determination. In this study, for the purpose of attitude determination, we mainly examine a modified COTS (Commercial off-the-shelf) GPS receiver originally developed for automobile use. We apply an on-the-fly algorithm using a least squares search method to an initial attitude determination algorithm, and obtained an ambiguity solution. In the paper, we report and discuss the results of the fundamental experiments for functional evaluation of the COTS GPS attitude determination system.
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