Question

What does Omega and Decca have in common?

(a) Both measure the phase difference

(b) Both measure the time difference

(c) Both measure the power difference

(d) Both operate in the same frequency range

The question was asked by my school teacher while I was bunking the class.

This intriguing question originated from Hyperbolic Radio Systems in chapter Terrestrial Radio Navigation System of Avionics

Answer 1

Correct answer is (a) Both measure the phase difference

The explanation: Omega and Decca measure the phase differences between the signals transmitted from pairs of stations while the Loran-C and Chayka measure the time difference between the signal from two or more transmitting stations.