The DSU-33D/B Proximity Sensor is an all-weather, battery-operated, active,
radio-frequency, ranging radar. It is a single-mission device capable of
operating in an electronic countermeasure environment (ECM).
The sensor mounts on and provides a proximity function for the MK 80 and M117
series general purpose bombs. The sensor is capable of both high- and low-drag
releases, and it meets the unique requirements of the U.S. Air Force and
For the Air Force and Navy, bombs are equipped with an FMU-139C/B or
FMU-152A/B bomb fuze, an FZU-48/B, FZU-55/B or FZU-63/B bomb initiator, and a
filtered power-cable assembly. Mix-and-match combinations of fuze, sensor and
initiator provide the lowest-cost alternative to fuze/sensor in one hardware
Provisions for both ground and in-flight safety are incorporated as integral
design features to ensure that the sensor will operate the fuze only under
specific and selected conditions. The DSU-33D/B has passed appropriate
The sensor features advanced electronics technology, solid-state circuit
design and highly reliable parts. It is subjected to extensive testing during
all production stages.
In terms of accuracy, the DSU-33D/B allows for multiple drop configurations.
The sensor-processor signal returns from the weapon release all the way to the
ground. When jamming occurs, the ground signal overcomes the jamming signal and
initiates an above-ground burst, and when no jamming is present, the sensor
provides a very accurate height of burst.
ATK has delivered over 154,000 DSU-33 series Sensors since 1999. The
DSU-33D/B is currently in production for the U.S. Government under a new Full
Rate Production Contract, ATK’s fourth.
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