Award Data

This project is the development of a single crystal underwater acoustic modem transducer for Unmanned Underwater Vehicles (UUV) which is compact in size, operates at low to moderately low center frequencies, in a broad band frequency range to accommodate state-of-the-art binary, FSK and spread spectrum signaling schemes that promote covertness. The device exploits the high coupling coefficient an ...

Underwater acoustic modeling plays an essential role in the design, development, test, and operation of sonar systems. Active acoustic clutter can increase the sonar false alert rate or equivalently decrease the probability of detection/classification, and is a key issue in the development and utility of active sonar systems. The ability to predict reverberation and clutter is inseparably tied to ...

TAC PROPOSES TO CONDUCT A STUDY TO EVALUATE THE COMPARATIVE EFFECTIVENESS OF VARIOUS FORWARD-LOOKING AUTONOMOUS SENSORS AND ALGORITHMS FOR TLAM-C. THE CURRENT TLAM-C USES A TERRAIN MAPPING RADAR ALTIMETER AND CORRELATES THE SENSED AREA AT KEY WAYPOINTS WITH A STORED DIGITAL REPRESENTATION OF THE TERRAIN AREA AT THE WAYPOINTS TO PROVIDE MID-COURSE AND TERMINAL GUIDANCE CORRECTION TO THE INERTIAL NA ...

Sensorless linear motor control addresses the market need for cost effective and more reliable control of electric motors by removing the mechanical sensors from the feedback control system. The mechanical sensors are the weakest link in the controlsystem in terms of reliability and parts and maintenance costs, especially in demanding environments. For linear motors in particular, the position se ...

Closed-loop control techniques such as those based on inner loop vector current control are well suited to meeting these performance criteria. However, they require flux or armature position knowledge which is usually based on the use of mechanicalfeedback sensors. Mechanical feedback sensors for position or velocity are the most unreliable link in the control system when subjected to harsh cond ...

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Underwater acoustic modeling plays an essential role in the design, development, test, and operation of sonar systems. Active acoustic clutter can increase the sonar false alert rate or equivalently decrease the probability of detection/classification,and is a key issue in the development and utility of active sonar systems. The ability to predict reverberation and clutter is inseparably tied to ...

MAJOR AIDS TO NAVIGATION (ATON) ARE ESSENTIAL SIGNPOSTS FOR SAFE PASSAGE ALONG COASTAL AND OFFSHORE SEAWAYS. PRESENTLY, THEIR SIGNALS ARE POWERED BY ON-SITE ENGINE GENERATORS REQUIRING CONSIDERABLE AND COSTLY MAINTENANCE. ATON AUTONOMY WILL BE GREATLY INCREASED WITH DEEP DISCHARGE BATTERY TECHNOLOGY PROVIDING THAT ON-SITE CHARGING SOURCES ARE USED. AMONG NATURALLY AVAILABLE SOURCES, THE UNCEASING ...

Current helicopter sonobuoy launchers are complex, heavy and will not meet future requirements for mission versatility. Because of the complexity of the launcher and its pneumatic subsystem, the launcher has many points of potential failure; itsreliability is poor. Further, as in other pneumatic systems involving stored compressed air, the system is subject to vagaries of pressure which can result ...

Modern weapon and aircraft control systems are software intensive, containing many complex internal and external interfaces. Accurate testing is vital to ensure that the system is functioning properly and will meet all operational requirements. For themost part, current testing focuses on components and subsystems; it is labor intensive and relies heavily on the subjective judgment of expert per ...