The steered response power phase transform (SRP-PHAT) is a beamformer method very attractive in acoustic localization applications due to its robustness in reverberant environments. This paper presents a spatial grid design procedure, called the geometrically sampled grid (GSG), which aims at computing the spatial grid by taking into account the discrete sampling of time difference of arrival (...

] Abstract: An effective way to locate RF transmitters is to measure the time-difference-of-arrival (TDOA) and the frequency-difference-of-arrival (FDOA) between pairs of signals received at geographically separated sites, but this requires that samples of one of the signals be sent over a data link. Often the available data link rate is insufficient to accomplish the transfer in a timely manne...

In many passive localization applications, the reference waveform of received electromagnetic signals is partly known. The in such scenarios are formulated by modelling relationship between data and known signal parameters interest, as time-difference-of-arrival (TDOA) frequency-difference-of-arrival (FDOA). By exploiting prior information carried signal, negative impact random noise can be sig...

The location of an emitter is estimated by intercepting its signal and sharing the data among several platforms to measure the time-difference-of-arrival (TDOA) and the frequency-difference-of-arrival (FDOA). Doing this in a timely fashion requires effective data compression. A common compression approach is to use a rate-distortion criterion where distortion is taken to be the mean-square erro...

Title of dissertation TIME-BASED LOCATION TECHNIQUES USING INEXPENSIVE, UNSYNCHRONIZED CLOCKS IN WIRELESS NETWORKS Matthew Yew Mun Mah, Doctor of Philosophy, 2011 Dissertation directed by Professor Ashok Agrawala Department of Computer Science The ability to measure location using time of flight in IEEE 802.11 networks is impeded by the standard clock resolution, imprecise synchronization of th...

The conventional global positioning system (GPS) can often fail to provide position determination for a mobile user in indoor and urban environments. To cope with GPS failure in such environments, a new navigation system which utilizes a terrestrial digital multimedia broadcasting (T-DMB) signal to obtain the mobile user's position is presented. Since the T-DMB transmitters in Korea construct a...

Microseismic signals are generally considered to follow the Gauss distribution. A comparison of the dynamic characteristics of sample variance and the symmetry of microseismic signals with the signals which follows α-stable 10 distribution, reveals that the pulse characteristics of the microseismic signal is outstanding and that the probability density curve of the microseismic signal is approx...

We present an approach 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 do not emit signals for localization and exchange only the time points when environmental signals are received: the time differences of arrival (TDOA). The signals occur at distant but unknown position...

We present an approach for the localization of passive receiver nodes in a communication network. The only source of information is the time when environmental sound or ultrasound signals are received. The discrete signals occur at unknown positions and times, but they can be distinguished. The clocks of the receivers are synchronized, so the time differences of arrival (TDOA) of the signals ca...

Direction of arrival (DOA) and time difference (TDOA) hybrid localisation is an effective technique. Station position errors affect performance. Owing to the highly non-linear nature problem, there are few methods DOA/TDOA in presence station errors. Hence, iterative constrained weighted least squares (ICWLS) algorithm proposed estimate locations multiple targets stations for with To ensure con...