What is the main underlying operating principle of an aircraft’s Distance Measuring Equipment (DME)?
A measurable amount of time is required to send and receive a radio signal through the Earth’s atmosphere .
The difference between the peak values of two DC voltages may be used to determine an aircraft’s distance to another aircraft.
A measurable frequency compression of an AC signal may be used to determine an aircraft’s altitude above the earth.
A phase inversion between two AC voltages may be used to determine an aircraft’s distance to the exit ramp of an airport’s runway.
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