On methods to improve time delay estimation for underwater acoustic source localization
نویسندگان
چکیده
This paper addresses the problem of acoustic source localization in shallow water environment commonly dominated by impulsive noise and multipath phenomenon. Traditionally acoustic source localization with sensors spaced several wavelengths apart involves Time Delay Estimation (TDE) via Generalized Cross-Correlation Phase Transform (GCCPHAT). However multipath signals and impulsive noise in underwater ambience result in spurious peaks leading to anomalous time delay estimates, and in turn erroneous computation of source location. In the present work we recommend two methods to improve time delay estimation, based on order statistics and via signal detection. Simulation results indicate a significant improvement in time delay estimation as compared to GCC-PHAT in presence of impulsive noise and multipath induced fading.
منابع مشابه
Neural Networks for High Performance Time-delay Estimation and Acoustic Source Localization
Time-delay estimation is an essential building block of many signal processing applications. This paper follows up on earlier work for acoustic source localization and time delay estimation using pattern recognition techniques in the adverse environment such as reverberant rooms or underwater; it presents unprecedented high performance results obtained with supervised training of neural network...
متن کاملModel-based Underwater Acoustic Source Localization and Speed Estimation Using Hf Transmissions
This work addresses the problem of inferring side information about an underwater acoustic (UWA) channel, particularly the spatial transmitter/receiver configuration and relative speed vector from the environmental signature imprinted on high-frequency (HF) communication signals by the propagation medium. We adopt a framework for representing UWA time varying channels using a 3-dimensional Dela...
متن کاملDistributed Passive Sonar System for Performance Evaluation of Low Depth Underwater Acoustic Source Localization Using Relative Time Delay Based Techniques
This paper presents the preliminary studies of a distributed passive sonar system for the localization and tracking of underwater acoustic sources. The techniques under test are one referred to as hyperbolic and mainly developed by Carter and another proposed by the authors and based on neural network processing. Both techniques are supported on the measurement of the relative time delay of an ...
متن کاملEffect of Underwater Ambient Noise on Quadraphase Phase-shift Keying Acoustic Sensor Network Links in Extremely Low Frequency Band
This study evaluates the impact of underwater ambient noise using seven real noise samples; Dolphin, Rain, Ferry, Sonar, Bubbles, Lightning, and Outboard Motor in three frequency ranges in extremely low frequency (ELF) band. The ELF band is the most significant bandwidth for underwater long-range communication. ELF band which is extended from 3 to 3000 Hz clearly, faces bandwidth limitation. Me...
متن کاملOptimal Microphone Placement for Source Localization using Time Delay Estimation
A commonly used method for Acoustic Source Localization is based on Time Delay Estimation (TDE). In general discrete TDE algorithms are used which result in discrete Time Difference of Arrival (TDOA) estimates, i.e. range differences. The Position Location of an acoustic source can be calculated using a set of TDOAs. The accuracy of the position greatly depends upon the accuracy of the estimate...
متن کامل