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The AN/SSQ-53 Directional Frequency Analysis and Recording (DIFAR) sonobuoy is an active, directional sonobuoy used by ASW/patrol fixed-wing aircraft and helicopters. After initial passive detection of a target is made, the SSQ-53 is employed to use active echo ranging to determine a target's exact bearing. The D(2) version is the current primary sonobuoy of the U.S. Navy.

The sonobuoy consists of three main units and their attachments. The parachute unit includes a windflap which...

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