Sonar Designing with the Ability of Acoustical Noise Canceller by Using Adaptive Filter

Ocean environmental noises are a significant and specific acoustic feature that influence sonar performance. These noises are affected by surface state (like wavy state of the sea, wind speed, etc.), above space of surface, aquatic animals and specially shipping noises. To improve the performance of sonars (acoustic targets detection), use of beam-forming for noise cancelling is not suitable. Because the system can only cover a specific range of environment while all acoustical waves are essential for targets detection. The proposed solution of this paper is utilizing adaptive filter for cancelling acoustical noise from sonar targets echoes. Since environmental noise is very effective on sonar systems, using the proposed method is very essential to improve the performance of the system. Simulation results show that the proposed sonar system can completely discriminate received acoustical waves and environmental noise and increase probability of detection.