This paper presents a study on source localization using time difference of arrival (TDOA) measurements from static sensors in the presence of random errors in sensor positions. We develop a constrained weighted least squares (CWLS) source localization method which incorporates the relationship between the source position and an auxiliary variable as a constraint. The CWLS source localization i...

When more than two microphones are used, the traditional time-delay-of-arrival (TDOA) based sound source localization (SSL) approach involves two steps. The first step computes TDOA for each microphone pair, and the second step combines these estimates. This two-step process discards relevant information in the first step, thus degrading the SSL accuracy and robustness. Although less used, one-...

The landslides cause several casualties and economic losses all over the world. Studies show that most casualties happen within the first 18-35 minutes after the burial. This demands life-detecting systems to be available immediately on the spot after the disaster. A suggested approach is deploying multiple units of these instruments across the country. Main constraint in developing countries f...

In this manuscript we consider the well-established problem of TDOA-based source localization and propose a comprehensive analysis of its solutions for arbitrary sensor measurements and placements. More specifically, we define the TDOA map from the physical space of source locations to the space of range measurements (TDOAs), in the specific case of three receivers in 2D space. We then study th...

A hybrid location finding technique based on time difference of arrival (TDOA) with round-trip time (RTT) measurements is proposed for a wideband code division multiple access (WCDMA) network. In this technique, a mobile station measures timing from at least three base stations using user equipment receive–transmit (UE Rx– Tx) time difference and at least three base stations measure timing from...

We define the term lateration to mean for distance measurements what angulation means for angles. Lateration computes the position of an object by measuring its distance from multiple reference positions. Calculating an object’s position in two dimensions requires distance measurements from 3 non-collinear points as shown in Figure 1. In 3 dimensions, distance measurements from 4 non-coplanar p...

Abstract We provide a survey on the joint European research project “GeoMetre”, which explores novel technologies and their inclusion to existing surveying strategies improve traceability of geodetic reference frames SI definition metre. This work includes development distance meters with range up 5 km, realisation optical multilateration systems for large structure monitoring at an operation 5...

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...

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...