Basis for a mathematical theory of direction-defining radio beacons

Abstract
A study of the relative performance factors of conventional radio ground beacons provides the necessary evidence for the postulation of an ‘ideal’ direction-defining beacon, and this, in turn, permits the identification of the limitations of practical systems. Theory confirms that signal-amplitude-comparison and phasecomparison systems are equivalent, but practical considerations lead to the conclusion that a specific performance is likely to be achieved with greater simplicity by the ‘Doppler’ version of the ‘phase’ system. Suggestions are made for new-generation beacons which code direction in terms of frequency, a parameter which is more easily defined and measured with accuracy than any other

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