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 Navy.
For the Air Force and Navy, bombs are equipped with an FMU-139/B or FMU-152/B bomb fuze, an FZU-48/B or FZU-55/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 package.
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 environmental tests.
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.
|Airspeed||250 to 700 KCAS|
|Delivery altitude||200 to 50,000 ft|
|Power supply||Battery-initiated by FZU-48 Initiator, FMU-152/B Fuze, FZU-55/B Initiator, or Navy FFCS|
|Height of burst||14 to 26 ft (2 sigma factory requirement)|
|Closing velocity for fuzing||75 to 1,400 ft/sec|
|Weight||Less than 5 lb|
|Reliability||95% after 10 yr|
|Operational life||200 sec minimum|
|Shelf life||10 yr minimum|
|Service life||5 yr minimum cumulative days outside storage and assembled in a warhead|
DSU-33D/B Proximity Sensor data sheet