Which of the following methods is used to locate sources of noise interference or jamming?

The method used to locate sources of noise interference or jamming is radio direction finding. This technique involves measuring the direction of incoming radio waves to identify where the signal originates. By using specialized equipment, operators can determine the bearing of the noise source based on the received signal's angle. This is particularly useful in scenarios where radio communication is disrupted by unwanted external signals.

Echolocation is primarily associated with certain animals, like bats and dolphins, which use sound waves to navigate and locate objects. Doppler radar is a technology that measures the change in frequency of signals to determine the speed and motion of objects, rather than specifically locating interference sources. Phase locking is a technique related to synchronization of signals, often used in communication systems, but it does not directly address the location of noise sources. Thus, radio direction finding stands out as the correct method for identifying interference or jamming sources.