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25-09-2021 Cognitive Radio

Q. Which among the following techniques is employed in long range navigation (LORAN)?

A. Round trip time of a radio pulse
B. Time difference between two radio pulses
C. Phase difference between two continuous signals
D. Phase difference between the transmitter and the receiver


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Dapzoi Verified
Commented on 2021-09-25 14:17:08 (IST)
Answer: B

Explanation: Long range navigation is a hyperbolic radio navigation system operating at low frequencies. The hyperbolic navigation system in LORAN uses the time difference between radio pulses to locate the object of interest. An electronic clock was employed to generate trigger signals that maintain a fixed delay such as 1 ms between the transmitters.