The problem of locating a mobile terminal has received significant attention in the field of wireless communications. Time-ofarrival (TOA), received signal strength (RSS), time-difference-of-arrival (TDOA), and angle-of-arrival (AOA) are commonly used measurements for estimating the position of the mobile station. In this paper, we present a constrained weighted least squares (CWLS) mobile posi...

In this paper, we focus on the localization of a passive source from time difference arrival (TDOA) measurements. TDOA values are computed with respect to pairs fixed sensors that required be accurately time-synchronized. This constitutes weakness as all synchronization techniques vulnerable delay injections. Attackers able either spoof signal or inject asymmetric delays in communication channe...

By taking different kinds of measurements at the same time, it may be possible to improve accuracy target localization or reduce number sensors needed. Time-of-arrival (TOA), time-difference-of-arrival (TDOA), time delay (TD), received signal strength (RSS), and angle-of-arrival (AOA) are commonly used in wireless systems. This article first presents a new weighted least squares (WLS) algorithm...

Time difference of arrival (TDOA) and frequency (FDOA) have been widely used for localizing temporally continuous signals passively. Temporal sparsity pulse makes their TDOA FDOA estimation processes much different, computational complexity is a major concern in this area. This paper addresses the problem fast focuses mainly on narrowband coherent pulses. By decoupling effects cost function loc...

Multidimensional scaling (MDS) is an attractive technique for a moving source localisation from time and frequency difference of arrival (time differences (TDOA)/frequency (FDOA)) measurements. However, its optimality has not yet been proven theoretically because the difficult Moore–Penrose pesudo-inverse operation. In addition to theoretical incompleteness MDS technique, sensor uncertainties a...

A study is conducted with the aim to reveal relationship between performance of moving object tracking algorithms and anchor (station) deployment. The dilution precision (DoP) for time difference arrival (TDoA) technique respect deployment studied. Linear non-linear estimators are used TDoA algorithms. research findings linear estimator indicate that DoP attains a lower value when other anchors...

To address the difficulty in calculating nonlinear equation of time difference arrival (TDOA) positioning, as well problem measurement error hybrid arrival/angle (TDOA/AOA) positioning algorithm, an improved sparrow search algorithm is proposed to optimize and optimization mechanism retained on basis improving performance original algorithm. The maximum likelihood estimation method used calcula...

Tracking a mobile node using a wireless sensor network under non-line of sight (NLOS) conditions, has been considered in this work, which is of interest to indoor positioning applications. A hybrid of time difference of arrival (TDOA) and angle of arrival (AOA) measurements, suitable for tracking asynchronous targets, is exploited. The NLOS biases of the TDOA measurements and the position and v...

In this paper, we present a novel DOA estimation method for human speech using subband weighting. Existing DOA estimation methods still can not perform quite reliably in low SNR condition. To improve the robustness of DOA estimator in noisy environment, we propose a novel DOA estimation approach. Firstly, the speech signal of each channel is passed through a Gammatone filterbank to obtain a set...