Measurements of Ultra Wide Band In-vehicle channel-statistical description and TOA positioning feasibility study.

Mobile node localization is one of the challenging and crucial issues in wireless sensor networks. The paper proposed a new approach to mobile localization, called LLA (Lee Localization Algorithm), to mitigate TOA measurement errors. The algorithm was divided into three phases: (1) pre-ranging algorithm was proposed to initialize localization by employing TOA method; (2) refinement algorithm wa...

Tubo-ovarian abscesses (TOA) are commonly associated with pelvic inflammatory disease (PID) caused by sexually transmitted infections (STI). There have been several reports of adolescent non-sexually active female patients diagnosed TOAs. Symptoms TOAs often mimic appendicitis and as such. We present a case 12-year-old who was initially ruptured found to TOA engulfing the appendix.

Source Localization in the non-synchronous mobile system is a very important issue since it only requires synchronized clocks between the based stations (BSs) and can reduce system complexity. There are time-difference-of-arrival (TDOA) and pseudo-range time-of-arrival (TOA) based localization techniques for a non-synchronous mobile system. Although many methods and performance analysis have be...

Subscriber radio location techniques are investigated for code-division multiple-access (CDMA) cellular networks. Two methods are considered for radio location: measured times of arrival (ToA) and angles of arrival (AoA). The ToA measurements are obtained from the code tracking loop in the CDMA receiver, and the AoA measurements at a base station (BS) are assumed to be made with an antenna arra...

In this paper, we propose an efficient twodimensional geo-location system for social safety robots, where its location is obtained by direction of arrival (DOA) and time of arrival (TOA) of the radio signal of IEEE 802.11a. The proposed system requires only two reference signals while the conventional systems generally deploy more than three reference signals. For estimating TOA and DOA informa...

Trilateration techniques for position estimation use distances measurements in order to determine the unknown location of a mobile user. In this paper, a Time of Arrival (ToA) based method for estimating distance in an IEEE 802.11b network is presented. This method uses the RTS/CTS handshake and an external time counter for computing the Round Trip Time (RTT) and estimate the ToA. The system de...

Indoor localization has been a long-standing and important issue in the areas of signal processing and sensor networks that has raised increasing attention recently. One of the key demands in assistive environment is to promptly and accurately determine the state and activities of an inhabitant subject. The indoor localization provides an effective means in tracking the positions, motions, and ...