Robust Towed Array Beamforming

In Phase I Robust Towed Array Beamforming (RTAB) work, Applied Hydro-Acoustics Research, Inc. (AHA) developed and tested several candidate algorithms, including a data-adaptive "Hole-Filling" algorithm, that recover losses of acoustic performance resulting from acoustic channels failures. With SURTASS TwinLine-R sea-test data we have shown a 2 to 3 dB improvement in quiet beam levels by "hole-filling" failed sensors, with performance restoration back to that of a fully operational array, for random channel failure-rates of up to 15%. Additionally, AHA has demonstrated this performance with operationally relevant passive broadband and narrowband processing and prototype displays. Acoustic performance results show that Robust Beamforming Algorithms support continued field-operations, with excellent performance, for arrays that may otherwise be deemed operationally unavailable. In addition, AHA performed a preliminary sizing and timing study to show that this technology will fit in an inexpensive hardware footprint. A Phase II follow-on contract is recommended. In Phase II, AHA will continue to design and develop RTAB algorithms, and then develop, integrate, and test real-time RTAB software and transition it to a Common Processor environment. In the Phase II Option AHA will perform algorithm updates and develop an approach to transition RTAB technology to other Navy sensors.