The Complex Ambiguity Function (CAF) used in emitter location measurement is a 2-dimensional complex-valued function of time-difference-of-arrival (TDOA) and frequency-difference-of-arrival (FDOA). In classical TDOA/FDOA systems, pairs of sensors share data (using compression) to compute the CAF, which is then used to estimate the TDOA/FDOA for each pair; the sets of TDOA/FDOA measurements are ...

The estimation of time difference of arrival (TDOA) plays an important role in acoustic source localization, blind source separation, acoustic sound control, and improved speech communication. However, when multiple sources are active in a reverberant environment, the TDOA estimates are known to suffer from the multipath and multiple source ambiguity, and hence are less reliable. In a previous ...

Multi-station joint localization has important practical significance. In this paper, phase difference of arrival (PDOA) information is introduced into the time (TDOA) and frequency (FDOA) method to improve target accuracy. First, Cramer–Rao lower bound (CRLB) TDOA, FDOA PDOA approach with multi-station precise synchronization derived. Then, CRLB differential (dPDOA) for case asynchronization b...

This paper presents field test results from a prototype GPS interference localisation system that uses spatially separated sensor nodes containing antenna arrays to localise interference using both Direction of Arrival (DOA) at each array and Time Difference of Arrival (TDOA) measurements between arrays. The synergy between antenna arrays and TDOA systems are explored and it is found that anten...

Location based services (LBS) provided by wireless sensor networks have garnered a great deal of attention from researchers and developers in recent years. Chirp spread spectrum (CSS) signaling formatting with time difference of arrival (TDOA) ranging technology is an effective LBS technique in regards to positioning accuracy, cost, and power consumption. The design and implementation of the lo...

2 Measurement Types and Performance Bounds 4 2.1 Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.1.1 Nuisance Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.2 Cramér-Rao Bounds for Localization . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.2.1 TOA, TDOA, and Distances . . . . . . . . . . . . . . . . . ....

This paper ties together and extends several recent results we have presented. We previously showed: (i) the usefulness of non-MSE distortion criteria in data compression for time-difference-of-arrival (TDOA) emitter location (SPIE 2001 & 2002), and (ii) the ability to exploit redundancy between radar pulses in a joint TDOA/FDOA (frequency-difference-of-arrival) location scheme (SPIE 2001 & 200...

Digital multimedia broadcasting signal is promised to be a wireless positioning signal. This paper mainly studies a multimedia broadcasting technology, named China mobile multimedia broadcasting (CMMB), in the context of positioning. Theoretical and practical analysis on the CMMB signal suggests that the existing CMMB signal does not have the meter positioning capability. So, the CMMB system ha...

The Federal Communications Commission (FCC) has adopted regulations requiring wireless communication service providers to provide position location (PL) information for a user requesting E-911 service. The Time Difference of Arrival (TDOA) technique is one of the most promising position location techniques for cellular-type wireless communication systems. The IS-95 Code Division Multiple Access...

In multidimensional source localization based on time difference of arrival (TDOA), it is difficult to identify the direct-path TDOA among all TDOA estimates of one sensor pair and to find the corresponding TDOA values belonging to the same source among different sensor pairs. In this paper, we present a graph based approach to solve this problem. It relies on the concept of consistent graph wh...