In this work, we investigate a dimensionality reduction scheme to use Time Delay of Arrival(TDOA) features across all microphones in a traditional HMM/GMM system. The subspace dimension is selected based on dimension of the TDOA vectors in an ideal recording, i.e., without environmental distortion or interference. Experiments in a dataset used in NIST Meeting Diarization evaluation reveal that ...

This paper revisits the problem of locating a signal-emitting source from time-difference-of-arrival (TDOA) measurements under non-line-of-sight (NLOS) propagation. Many currently fashionable methods for NLOS mitigation in TDOA-based localization tend to solve their optimization problems by means convex relaxation and, thus, are computationally inefficient. Besides, previous studies show that m...

In this paper, we investigate the mobile node localization problem in an underwater positioning system using multiple surface beacons, where time synchronization between beacons and nodes is not required. First, propose a Time-Difference-of-Arrival-based (TDoA-based) method. proposed method, as receives messages from more than or equal to three belonging same grid at one epoch, it calculates lo...

This tutorial involves implementing sonar processing algorithms and applying them to real underwater hydrophone data collected in the ocean. The goal of the tutorial is to learn how to apply the time-difference of arrival (TDOA) method to acoustic data recorded on two hydrophones to obtain a bearing estimate. TDOA processing is a classic passive sonar problem, and is also forms basis for many o...

This paper provides analysis and real-time performance comparisons on modified application from two-microphone classic adaptive noise cancelling and beamforming methods. Experiments are processed by software implementation using LabVIEW in a real environment, which is typical indoor office with moderate reverberation condition. The speech performances are analyzed in time and frequency domains ...

Time difference of arrival (TDOA) is commonly used to estimate the azimuth of a source in a microphone array. The most common methods to estimate TDOA are based on finding extrema in generalized crosscorrelation waveforms. In this paper we apply microphone array techniques to a manikin head. By considering the entire cross-correlation waveform we achieve azimuth prediction accuracy that exceeds...

The system which we propose to demonstrate for indoor localization competition is based on Time difference of arrival(TDOA) technique.Using our custom made hardware we could achieve localization of a mobile node by distance estimation from beacon nodes by using time difference of arrival between RF and ultrasonic signals and subsequent lateration operation. We also have developed a system for a...

Wireless location has become one of the important technologies of wireless sensor network application. Due to the underground wireless location affected by various factors, the positioning system cannot meet the actual demand. In this paper, Time Difference of Arrival (TDOA) and Received Signal Strength Indicator (RSSI) location technologies have been investigated, then various impact factors o...

In this paper, obtaining time of arrival (TOA) measurements in a sensor network is investigated. Differentiating these TOA measurements provides the Time Difference of Arrival (TDOA) measurements between sensor pairs. An approach is proposed to estimate the TOA at a single sensor in a semi-passive scenario. The theoretical investigation is supported by field trials. This experimental analysis p...

To maintain the Ad Hoc network connectivity and to perform efficient energy communication between several mobile stations (MS), optimized routing algorithms need accurate short-range localization or/and positioning data. Due to indoor propagation, multipath may dramatically increase location budget error and ask for innovative solutions allowing accurate time of flight measurement. An original ...