EASA NAV(A)intermediate
Arrange the steps of the Distance Measuring Equipment (DME) ranging process in the correct chronological order from first to last.
Answer
Airborne interrogator transmits a pair of interrogation radio frequency pulses, Ground transponder receives the pulses and transmits a reply after a fixed internal delay, Airborne receiver detects the reply pulses and measures total round-trip elapsed time, Airborne computer subtracts the transponder delay and calculates slant range distance
Explanation
DME derives distance from the time required for the interrogation and reply sequence. After accounting for system delay, the measured signal travel time is converted to slant range. **Key takeaway:** DME is a time-measurement ranging system.\n\n**Glossary:** **Interrogation**: signal requesting a response; **slant range**: direct line-of-sight range.
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