Question

Two way ranging can resolve ____

(a) amplitude difference

(b) frequency difference

(c) phase difference

(d) amplitude and phase difference

The question was posed to me during a job interview.

My doubt is from Environment Awareness topic in division Location and Environment Awareness in Cognitive Radio of Cognitive Radio

Answer 1

The correct answer is (c) phase difference

For explanation I would say: Synchronisation of oscillators of two transmitters may not be possible. In such a case, the measurement of path from the transmitter to receiver and from receiver to transmitter may be used to compensate for phase difference.