Radar and ARPA Manual, Second Edition: Radar and Target Tracking for Professional Mariners, Yachtsmen and Users of Marine Radar
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0 7506 6434 7 Elsevier Butterworth-Heinemann publications 2005
The word RADAR is an acronym derived from the words Radio Detection and Ranging. In the United Kingdom it was initially referred to as radio direction finding (RDF) in order to preserve the secrecy of its ranging capability.