The DDS 9000 systems provide improved performance over earlier diver detection systems through the use of wide-band signal processing, improved signal-to-noise ratios using pulse compression (chirp) and electronic vertical beam steering. Developments in sonar hardware have been matched by the development of the significantly advanced DDS Processor and DEFENDER III software for signal processing, detection, tracking and classification, fusion and display. The DDS 9000 also meets the US Department of Homeland Security's cost requirement per foot of protected shoreline and is suited to both military and civilian applications.