Dynamic threshold technique for noise removal in narrowband displays of underwater acoustic systems

Abstract

When we talk about the underwater acoustic systems, noise comes in mind simultaneously. This noise deteriorates the amount of important information presented on different displays. This deterioration plays significant role in the quality of displays. Dynamic removal of noise plays significant role in this regard as noise levels are consistently changing with the change in the sea environment. We have already removed unwanted noise from broadband displays and presented our work previously. That removal of noise from broadband display significantly improved quality of displays. By looking at the previous achievement, we extended our approach and implemented it for the removal of noise from narrowband displays. The dynamic noise floor is being calculated from normalization process. This dynamic noise floor is being updated each time on arrival of new data. Hence it changes and optimizes itself on the go dynamically every single second. This dynamic noise floor is then used to put a threshold cut on the narrowband displays. This results in some extraordinary results and noise removal from narrowband displays. A complete comparison of non-noise removed narrowband displays and noise removed narrowband displays with calculation is being presented in this paper. This technique removed unwanted noise from narrowband displays making frequency lines crispier and accurate on narrowband displays.