Selva Balan¹,Arti Khaparde²,Vanita Tank²,Tejashri Rade² and Kirti Takalkar², ¹Central Water and Power Research Station, India and ²Maharashtra Institute of Technology, India

A precise, linear indication of the depth of water in a specific part of water body is what always required.Presently there are a wide variety of ways to produce a signal that tracks the depth of water.The Ultrasonic signal is most commonly used for the depth estimation. This signal is affected by various underwater noises which results in inaccurate depth estimation. The objective of this paper is to provide noise reduction methods for underwater acoustic signal.In present work, the signal processing is done on the data collected using TC2122 dual frequency transducer along with the Navisound 415 echo sounder. There are two signal processing techniques which are used: The first method is denoising algorithm based on Stationary wavelet transform (SWT)and second method is Savitzky-Golay filter. The results are evaluated based on the criteria of peak signal to noise ratio and 3D Surfer plots of the dam reservoir whose depth estimation has to be done.

Savitzky-Golay filter, Wavelet transform, PSNR