An Effective Range Ambiguity Resolution for LEO Satellite with Unknown Phase Deviation

Seung Won CHO  Sang Jeong LEE  

IEICE TRANSACTIONS on Communications   Vol.E99-B   No.2   pp.533-541
Publication Date: 2016/02/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2015EBP3324
Type of Manuscript: PAPER
Category: Satellite Communications
ranging,  ambiguity resolution,  LEO satellite,  TTC,  transponder,  phase error,  

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Ranging is commonly used to measure the distance to a satellite, since it is one of the quickest and most effective methods of finding the position of a satellite. In general, ranging ambiguity is easily resolved using major and subsequent ambiguity-resolving tones. However, an induced unknown phase error could interfere with resolving the ranging ambiguity. This paper suggests an effective and practical method to resolve the ranging ambiguity without changing the original planned ranging tone frequencies when an unknown non-linear phase error exists. Specifically, the present study derives simple equations for finding the phase error from the physical relationship between the measured major and minor tones. Furthermore, a technique to select the optimal ambiguity integer and correct phase error is provided. A numerical analysis is performed using real measurements from a low earth orbit (LEO) satellite to show its suitability and effectiveness. It can be seen that a non-ambiguous range is acquired after compensating the unknown phase error.