This paper concerns a novel hybrid lidar-radar system for underwater s
urveillance. Simulations and laboratory measurements incorporating the
hybrid detection scheme revealed a 17-dB suppression of the water bac
kscatter signal (clutter) and corresponding target contrast enhancemen
t. These results led to the design, implementation and testing of a li
dar-radar system for ocean experimentation. Details of this system, in
addition to the goals and results of the ocean experiment, are presen
ted.