In this paper, a novel Expectation-Maximization algorithm for estimating the time-delay-of-arrival of multiple non-stationary sound sources in non-stationary reverberative acoustic environments, is presented. Motivated by the success of the phase-transform/histogram based approaches of Aarabi [2, 3], the algorithm operates by learning a probabilistic relationship between the latent TDOAs and th...

Precise navigation, as a method for guiding vehicles from one point to another, is an important subject these days especially in navigation of aircraft. Global satellite systems (GNSSs) are capable tools such purpose. Any intentional or unintentional interference signals may cause risks deadly accidents. Therefore, it tremendously control airports harbors and locate any existing radio frequency...

The global satellite navigation signal works well in open areas outdoors. However, due to its weakness, it is challenging position continuously and reliably indoors. In this paper, we developed a hybrid system that combines radio signals acoustic achieve decimeter-level positioning Specifically, transmitters are synchronized with different codes. At the same time, our decoding scheme only requi...

Localizing and tracking of marine mammals can reveal key insights into behaviors underwater that otherwise would remain unexplored. A promising nonintrusive approach to obtaining location information is based on recordings bio-acoustic signals by volumetric hydrophone arrays. Time-difference-of-arrival (TDOA) measurements echolocation clicks emitted odontocetes be extracted used for detection, ...

In this paper, we propose FlexTDOA, an indoor localization method and a system using ultra-wideband (UWB) radios. Our uses time-difference of arrival (TDOA) so that the user device remains passive is able to compute its location simply by listening communication between fixed anchors, ensuring scalability our system. The anchors communicate custom-designed, flexible time-division multiple-acces...

This white paper discusses the most common methods deployed to build up Real Time Location Systems (RTLS). These include Time of Arrival (ToA), Time Difference of Arrival (TDoA), Received Signal Strength (RSS), Time of Flight (ToF), and Round Trip Time (RTT). A special case of RTT, SDS-TWR, is described which offers a solution to the complexity, high power consumption, and high cost of most RTL...

The efficiency analysis a hyperbolic position location estimation in the multipath propagation environment in the wideband code division multiple access (WCDMA) interface was presented. Four, the most popular methods: Chan’s [1], Foy’s [2], Fang’s [3] and Friedlander’s [4] were considered. These algorithms enable the calculation of the geographical position of a mobile station (MS) using the ti...