We present two approaches for the localization of passive nodes in a communication network using ambient radio or sound signals. In our settings the communication nodes have unknown positions. They are synchronized but do not emit signals for localization and exchange only the time points when environmental signals are received. The signals occur at unknown positions and times, but can be disti...

Microphone arrays are widely employed for applications like teleconferencing, high quality sound capture, speaker recognition/identification, acoustic surveillance, head aid devices, speech acquisition in automobile environments etc. For all these applications the benefits that a microphone array provides over a single microphone are two fold. First using a microphone array we can localize a so...

For the problem of estimating time difference of arrival (TDOA) of radio waves impinging on a pair of antennas for the purpose of passively locating the source of a communications or telemetry signal in the presence of interfering signals and noise, a new class of signal-selective algorithms that are highly tolerant to interference and noise is introduced. In part I of this two-part paper, the ...

A hybrid TDOA/AOA positioning technique for indoor ultra wideband (UWB) systems is presented in this paper. The UWB system is a potential candidate for improving the location accuracy of indoor positioning due to the fine-resolution characteristic of the UWB signals. The hybrid technique consists of extended Kalman filters (EKF’s), which process time difference of arrival (TDOA) and angle of ar...

In a visible light positioning (VLP) system, a receiver can estimate its location based on signals transmitted by light emitting diodes (LEDs). In this manuscript, we investigate a quasi-synchronous VLP system, in which the LED transmitters are synchronous among themselves but are not synchronized with the receiver. In quasisynchronous VLP systems, position estimation can be performed by utiliz...

Low-complexity least-squares (LS) estimators based on time-of-arrival (TOA) or time-difference-of-arrival (TDOA) measurements have been developed to locate a target node with the help of anchors (nodes with known positions). They require to select a reference anchor in order to cancel nuisance parameters or relax stringent synchronization requirements. Thus, their localization performance relie...

This paper presents a wideband jamming emitter localization method based on the fusion of multiple direction-ofarrivals (DOAs) and time-difference-of-arrival(s) (TDOA(s)) obtained from multiple unmanned-aerial-vehicles (UAVs). In this technique, we assume that multiple trajectory controllable UAVs are available and they are equipped with smart antennas to estimate the emitter’s angle (DOA) with...

In this work we present improvements in our research on position and orientation estimation of an acoustic source by a microphone array network. Here, at the input of an artificial neural network (ANN), combinations of energy related features, time delay of arrival (TDOA) of microphone pairs, and source position candidates derived for every array of the array network are directly used in a mapp...

We present the design of a remotely deployable distributed wireless antenna system formed from wireless sensor network nodes. Specifically, the focus is on enhancing the detection range of a distributed wireless antenna system. The primary objective is to create a methodology to steer the beam in the desired direction to enhance radio frequency (RF) direction finding and follow-on signal recept...