NOKOMIS INC — Department of Defense SBIR Phase I: N182-116

Description

To reduce the false positive and false negative detection and identification of submarines, Nokomis proposes to build an artificial intelligence (AI) algorithm suite, in conjunction with its ultra-sensitive signal detection capability, to minimize the in-band interferences on existing airborne anti-submarine warfare (ASW) systems.To minimize the background noise and interference, the signal sources in underwater acoustic signals will be isolated. In addition to this, in some environmental conditions a submarine could hide between layers of different temperatures or different salt concentrations that greatly influence the sound propagation and make the target even harder to detect. In a shallow-water archipelago, these problems are further compounded by strong reverberation effects, caused by sound reflection from the sea floor, the surface, and islands, which lead to subsequent interference phenomena.The proposed technique includes three major steps. The first step is to remove the random noise by wavelet based denoising processing. The second step is to enhance the contrast of signal source of interest from acoustic signal. The third step is to isolate the signal sources of interest from acquired acoustic signal. The third step involves feature extraction processing, waveform matching processing, and AI based deep learning processing.