High Resolution Sea Surface Mapping Radar System

This Phase I SBIR proposal addresses the development of a novel rapid scanning radar interferometer designed to map the surface topography of the ocean surface within one kilometer of an unmanned surface vehicle (USV). A system capable of mapping local seaconditions and commanding an adaptive vessel control system would have the ability to steer the boat into the steepest waves to reduce the chance of capsizing in heavy seas. The proposed interferometer will operate in much the same way as a conventionalmarine radar, enclosing a rotating pair of fan beam antennas in a radome near the top of the USV to provide 360 degree coverage. The proposed system is based on proven technology developed for oceanographic research applications, that has demonstrated theability to produce ocean surface maps with an rms error of less than 5 cm. During Phase I, we propose to carry out a software simulation of the mapping process, accounting for realistic sea states and expected radar parameters. Based on the results ofthese simulations we will design a prototype system, including the radar, data system, and auxiliary sensors and interfaces necessary to implement real-time stabilization of a USV. Successful completion of this SBIR project will result in a practicalocean surface mapping system that can be used as a key element of an adaptive stabilization system for USVs. Such a system could also be employed as a steering aide for manned ships in high seas, reducing the workload on the ship's pilot.