NASA NTRS · 19740000024
Traffic control system and method
Abstract
Frequency of carrier received by aircraft is measured and compared with reference to indicate magnitude of Doppler shift. One Doppler frequency range is selected and indicated by digital signal. Difference between frequency is offset of apparent carrier frequency transmitted by aircraft.
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Laughlin, C. R., Hollenbaugh, R. C., Allen, W. K.. 1974-04-01. Traffic control system and method. https://ntrs.nasa.gov/citations/19740000024
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