Covert Underwater Communications

The objective of this project is to develop adaptive channel characterization algorithms for very low frequency (VLF) covert acoustic communications between submarines and other platforms. Technical issues that are addressed are channel propagation conditions in the VLF band and channel characterization; the impact of submarine motion on the signals transmitted in this band; and determination of optimal propagation conditions. On the signal and system level, consideration is given to determining a suitable covert signaling strategy; determination and implementation of adaptive signal processing methods for use at the receiver, including system initialization and tracking aspects.