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The AN/WLR-9 is the first of a series of acoustic intercept receivers (AIR) for submarines. All of these systems consist of hydrophones mounted in two domes, one of which is in the submarine's sail, a receiver/processor, and display.

The system analyses intercepted sonar signals to classify according to frequency and pulse duration as well as signal level and relative bearing. The current versions are automatic.

The WLR system is fitted as part of the Submarine Acoustic Warfare...

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