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In wireless sensor network (WSN), position awareness (localization) of the sensor nodes is necessary to exploit the communication and to provide the meaningful information about their surroundings. Here Received Signal Strength Indicator (RSSI) technique is used as it requires no extra hardware and can be used for both indoor and outdoor environment. RSSI is having limitations such as high randomness...
Localization in wireless sensor networks is a main issue, i.e. to determine the position of a given device in the network. Location information of mobile nodes is a demand in many wireless systems. To give the position of the target node reference points have to be used. The node can calculate its distance and/or angle between itself and the reference points. In the 2D space, if a node knows its distance...
This paper deals with the problem of single target tracking in controlled mobility sensor networks. It thus proposes an original strategy to manage the mobility of sensor nodes, in order to improve the estimation of the positions of the target. The proposed method consists of estimating the actual position of the target, then it uses position estimates to predict a region where the target is assumed...
This paper consider cooperative localization in cellular networks. In this scenario, several located mobile terminals (MTs) are employed as reference nodes to find the location of an un-located MT. The located MTs sent training sequences in the uplink, then the un-located MT perform distance estimation using received signal strength techniques. The localization accuracy of the un-located MT is characterized...
Nowadays indoor positioning applications have received great attentions among short range wireless communication systems. In particular, Wireless Sensor Network (WSN) is the most widely used technology for indoor localization as it is cheap and easy to deploy. However, location accuracy is limited by the harsh propagation of the Radio Frequency (RF) signals in indoor environments, for instance, caused...
A novel distributed angle estimation method for wireless sensor network localization is proposed in this paper. The anchor emits two linear frequency modulation waves simultaneously using its equipped two antenna elements, while the angle of departure of the emitted waves can be estimated independently at each sensor. The method only relies on radio transceivers and requires no time or carrier frequency...
This paper exploits optimal position of the mobile sensor to improve the target tracking performance of wireless sensor networks and simultaneously localize both of the static sensor nodes and mobile sensor nodes when tracking the human motion. In our approach, mobile sensors collaborate with static sensors and move optimally to achieve the required detection performance. The accuracy of final tracking...
Wireless Sensor Networks (WSNs) present one of the most representative and vibrant examples of networked embedded systems. With the emergence of location-based applications, location finding techniques are becoming increasingly important almost in all WSNs [1]. In this paper, we propose the improvement of location estimation of unknown wireless sensor nodes (a.k.a. unknowns or mobile nodes) through...
This is a research with the main objective to investigate the error rate in the location estimation of a wireless node, by considering the error rate of different terrains/clutters. Radio waves behave differently in different terrains. When the transmitted signal propagates through different terrains, the terrain impairments affect the transmitted signal. Because of the noise addition, the received...
Recent researches in mobile wireless ad-hoc and mobile sensor networks have shown the importance of location information from nodes participating in the networks. Although nodes with GPS-equipped device (anchor nodes) can be deployed in those networks to obtain the location information from nodes, researchers are interested in solving localization in networks that have a small fraction of anchor nodes...
Self-localization is one of the basic problems in wireless sensor networks. In this paper, we propose a new localization algorithm using received signal strength (RSS) with seven anchors in order to balance the complex technology for distance estimation and the accuracy of the localization. First, based entirely on comparison of received signal strength transmitted by mobile anchors, the static nodes...
Location estimation of sensor nodes is an essential part of most applications for wireless sensor and actor networks (WSAN). The ambiguous location information often makes the collected data useless in these applications. Environmental monitoring in particular, relies on an accurate position estimation in order to process or evaluate the collected data. In this paper, we present a novel and scalable...
Recent years, directional antenna has been extensively used in designing protocols for wireless sensor networks. It provides many advantages over classical omni-directional antenna, such as increased spatial reuse ratio and reduced energy consumption. In wireless sensor networks, location estimation is necessary for sensor nodes to provide meaningful information about their surrounding environment...
In this paper a new concept for an infrastructure independent approach to indoor person localization is outlined. It is proposed to deploy an ad-hoc wireless sensor network (WSN) by means of a pedestrian dead reckoning (PDR) unit. The deployed nodes are initialized with a PDR-determined position estimation. Furthermore, a subset of the nodes has a GPS connection and thus an accurate estimation of...
Conventional 3-dimensional coordinate calculation method required reference nodes at least four. Because of this reason, complexity increased in 3-dimensional coordinate calculation method. In this paper we proposed a new location method in order to solve this kind of problem. The new location method used triangulation method and binary search. Binary search is for enhancing efficiency of iteration...
Link quality estimation is a thorny problem in wireless sensor networks, because its accuracy affects the design and the efficiency of networking protocols and applications. Especially in the context of low-power wireless, estimating the link quality poses a sort of catch-22 dilemma, whereby a large number of packet samples are required to accurately estimate a channel, but only a few samples should...
Mobile sensor networks have received significant attention recently. Mobile sensors are deployed to achieve network load balancing, prolonging network lifetime, and improving network coverage, by monitoring critical areas where manual sensor deployment cannot be performed. To achieve these goals, energy estimation is one of the main constraints and concerns to consider, while deploying mobile sensors...
In this paper a system level analysis and implementation of two-layer mobile wireless sensor network architecture is proposed for tracking and environmental supervision applications. It uses a mobile Master Sensor Node (MSN) that collects information inside a Sensor Area Network (SAN) where many semi-passive Slave Sensor Nodes (SSN) are deployed. The collected information is sent through a Wireless...
Wireless Sensor Network (WSN) is composed of sensor nodes deployed to achieve some specific task. Localization of individual mobile node is a challenging task in wireless sensor networks. Localization system is not only for location identification but also provides the base for routing, density control, tracking, and a number of other communication network aspects. In real time applications of outdoor...
The problem of localizing an uncooperative target using binary observations and without the knowledge of the propagation model is considered. Three new estimators for the location of the target are utilized. Their performance, in the MSE sense, is studied analytically and through simulations. Results show that these estimators significantly outperform the existing approach.
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