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Published in:
2021 | OriginalPaper | Chapter
2. Navigation Satellite Constellations and Navigation Signals
Author : Prof. Kegen Yu
Published in: Theory and Practice of GNSS Reflectometry
Publisher: Springer Singapore
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Abstract
Ground-based radio navigation had been used for more than half a century before the first GPS satellite was launched in the late 1970s. Many radio navigation systems have been developed and put into use since the early of 20th century, including Telefunken Kompass Sender (radio direction finder), Decca (Decca Navigator System), (VOR) VHF Omnidirectional Range, TACAN (Tactical Air Navigation System), LORAN (LOng RAnge Navigation), and OMEGA. Most of the systems ceased to provide navigation service, although some of them have been used for other purposes.