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Location-awareness is crucial and becoming increasingly important to many applications in wireless sensor networks. This paper presents a network-based positioning system and outlines recent work in which we have developed an efficient principled approach to localize a mobile sensor using an TOA/AOA hybrid positioning scheme employing multiple seeds in the line-of-sight scenario. The proposed algorithm...
In this paper we show the results of an experimental assessment of an indoor localization system based on a Wireless Sensor Network. The estimated position of a target node embedded in the monitored environment is obtained by running of the Relative Span Exponentially Weighted Localization (REWL) algorithm, a novel localization procedure recently proposed in the literature. The inputs of the algorithm...
A novel distributed localization method for wireless sensor networks (WSN) is proposed in this paper. Linear frequency modulation (LFM) waves are emitted from two anchors simultaneously to create an interference field. Through the frequency measurement of local RSSI (Received Signal Strength Indication) signal, the TDoA (Time-Difference-of-Arrival) is estimated independently at each sensor to detect...
We address the issue of self-adaptation of a sensor network with mobile sensors to better observe and track events of interest in an urban scenario. We present middleware called Event-driven Network Controller (ENC) that resides at every sensor node in the network and is independent of the sensor type. ENC translates the requirements of the application layer (focused on improving of the quality of...
Object tracking is one of important applications in wireless sensor networks. The key issues involved in object tracking are object detection, target classification, location estimation, and location management. The main theme of this paper is location management. Tree-based location management schemes have been studied extensively. However, the traditional tree-based schemes have two major drawbacks...
This paper addresses the problem of tracking mobile nodes in Wireless Sensor Networks (WSN). Our approach is based on a tracking with range-only measurements scheme, intended for implementation in WSN. The developed tracking system is designed for continuous estimation of the target's trajectory and two-axes velocity. A network of "anchor" wireless nodes is considered to be deployed at a...
A novel distributed TDoA (Time-Difference-of-Arrival) estimation method for wireless sensor networks (WSN) is proposed in this letter. Linear frequency modulation (LFM) waves are emitted from two anchors simultaneously to create an interference field. Through the frequency measurement of local RSSI (Received Signal Strength Indication) signal, the TDoA is estimated independently at each sensor to...
To the problem of distributed estimation for Mobile Sensor Networks, a new algorithm, named Consensus based Distributed Unscented Information Filter(C_DUIF), was presented, which was based on Unscented Information Filter, Consensus algorithm, as well as a distributed fusion architecture. The proposed algorithm took important properties for estimating accuracy (Unscented Transform), fusion ability...
Current sensor network technology for detection and tracking are focused solely in terms of static networks and suffers from device specific inadequacies such as lack of coverage, power and fault tolerance. Failing nodes result in coverage loss or breakage in connectivity and hence there is a pressing need for a robust system. In this work a unique sensor network is fielded that uses multiple frequencies...
Accurate local positioning systems usually use a network of anchor nodes at known locations to track mobile nodes based on the measurement of the time of arrival (TOA) at anchor nodes of beacon signals transmitted by the mobile nodes. To localize the mobile node either TOA processing, where the unknown transmit time is estimated along with the node location, or time difference of arrival (TDOA) processing,...
The main aim of future wireless multimedia networks is to provide sufficient amount of resource to a multimedia call. Reserving required amount of resource in advance to a future new and handoff call is better than rejecting a call at neck of the moment due to insufficient resource at a particular time. This paper presents an efficient handoff resource management strategy by considering the future...
This paper presents a solution to the problem of self-localisation of mobile nodes in wireless sensor networks with unknown measurement noise characteristics. A Gibbs sampling algorithm estimates the unknown noise parameters followed by localisation of mobile nodes with a multiple model auxiliary particle filter (MM AUX-PF). The performance of the Gibbs sampler and MM AUX-PF is investigated in terms...
This paper presents an abstract framework for the optimization of mobile sensing devices in distributed parameter systems. The optimization is performed on the repositioning of these devices throughout the spatial domain. It is assumed that a network of mobile sensing devices is available to obtain measurements from the spatially distributed process. Both a centralized state estimator with mobile...
We propose a one-way ranging algorithm which is based on wireless synchronization with measured timestamps and clock frequency offsets. In the active mode one-way ranging algorithm, a mobile node initiates ranging procedure by transmitting a ranging frame, and anchor nodes report their time stamps for received ranging frame to reference anchor node connected to location server. In the passive mode...
A lot of research has been done in finding range-based methods such as computing RSSI, time of arrival, angle of arrival or time difference of arrival and range-free methods such as centroid computation, DV-hop and approximate position in triangle, for localization in wireless sensor networks. Range-based methods estimate location more precisely than range-free methods. However, range-free methods...
Wireless sensor networks (WSNs) are a large ad hoc networks of distributed sensors that are equipped with low power supply modules. Location information is a basic requirement for many WSNs applications. Because localization accuracy is sufficient for many sensor network applications, range free localization schemes based on RSSI technique are being pursed as a cost effective and convenient alternative...
So far a considerable number of studies have been conducted on the localization methods for stationary wireless sensor networks (WSNs). However, little attention has been given to the localization scheme for a mobile wireless sensor network (MWSN) where all sensor nodes are moving. In this paper, we propose a self localization scheme with relay nodes which transmit the information from an anchor node...
Wireless sensor networks (WSNs) is emerging as a key tool for data acquisition in many applications, and localization algorithms of the sensors have a vital importance due to the intrinsic characteristics of this type of networks. The objective of this paper is to propose an algorithm of range-free localization for WSNs using a mobile beacon node equipped with a rotary directional antenna. The azimuthally...
This paper presents the integration of immerse 3D graphics contents as the representative of guidance information in real-time indoor environment. The designed system enables the tracking of nearby targets by utilizing the exact same system within the wireless sensor network sensing range. During the tour, union of 2D and 3D graphics provide even clearer path navigation while supporting textual information...
In the paper, a new range-boundary aware mobility-assisted localization(RAML) scheme is presented to make mobile sink identify the location of sensor nodes which are deployed in a random mode within a certain geographical area. Not like other localization techniques, the presented localization scheme works without any additional hardware and achieves better efficiency through broadcasting special...
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