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Node localization is an essential component of many wireless networks. It can be used to improve routing and enhance security. Localization can be divided into range-free and range-based algorithms. Range-based algorithms use measurements to estimate the distance between nodes. Range-free algorithms are based on proximity sensing between nodes. Range-based algorithms are more accurate but also more...
The research of fast position miners in tunnels is of great importance in that it can provide accurate information about where the miners are, and minimize the loss of the disaster. To solve the problem of localization in underground mining areas where GPS positioning is not available, underground miners localization system based on ZigBee and WebGIS technology is proposed. Underground miners are...
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...
Sensor localization is a necessary and key functionality for the deployment of wireless sensor network (WSN) applications. This paper investigates on the range-free localization approaches for low hardware requirement. A modified DV-Hop localization algorithm is designed to reduce the localization error. The modified DV-Hop uses a novel average hop size estimate scheme, in which the local property...
One of the most important aspects of a WSN is its localization scheme. Adequate accuracy, complexity, timing, and vulnerability to environment pitfalls are all worth considering parameters. Here, we propose discrete probabilistic DV-Hop, an enhancement to DV-Hop, a well-known range-free WSN localization algorithm, aiming to improve both its localization accuracy and complexity. One should note that...
As wireless sensor networks are ubiquitous in nature, localization is an important factor to be solved. Localization of an unknown node can be identified through a set of reference nodes. In this paper, we present a novel hybrid localization technique, which determines the exact location coordinates of an unknown node through the combination of both range free and range based methods. The location...
In many applications of Wireless Sensor Networks (WSN), it is crucial to know the location of sensor nodes. Although several methods have been proposed, most of them have poor performance in irregularly shaped networks. MDS-MAP is one of the localization methods based on multidimensional scaling (MDS) technique. It uses the connectivity information to derive the location of the nodes in the network...
Wireless sensor networks had a big diffusion in the last few decades and they are used in many application domains. Services built on them require to handle a big amount of data, and a fundamental requirement is their quality, highly affected by the security of the whole system. Some encryption techniques can be adopted, but it is also necessary to verify the reliability of nodes that sense, aggregate,...
Wireless sensor networks (WSNs) have been of high interest during the past couple of years. One of the most important aspect of WSN research is location estimation. As a good solution of fine grained localization Reichenbach et al. introduced the distributed least squares (DLS) algorithm, which splits the costly localization process in a complex precalculation and a simple postcalculation which is...
Many applications of wireless sensor networks (WSNs) require location information of the randomly deployed nodes. A common solution to the localization problem is to deploy a few special beacon nodes having location awareness, which help the ordinary nodes to localize. In this approach, non-beacon nodes estimate their locations using noisy distance measurements from three or more non-collinear beacons...
Besides sensing the environment variables, the application of localization in wireless sensor networks has became an important research subject. Unlike the other range-free localization schemes which are not effective in real time performance, we propose a real time algorithm, which determines the location of the moving object based on dynamically changing signal strength. The simulation results demonstrated...
The localization technology is very important in wireless sensor network. Many localization algorithms have been proposed in recent year, in which DV-Hop is the prevail localization algorithm. But the DV-Hop algorithm is not very accurate. In this paper, we propose an algorithm to improve the positioning accuracy. The proposed algorithm mainly bases on the radio range of anchor nodes to determine...
Localization problems of the WSNs (wireless sensor networks)geostationary nodes are studied,and the localization algorithm (Fast and Rough Nodes Location Algorithm) based on the communication power mediation for geostationary nodes by receiving the localization information from anchor nodes is presented.The localization estimate of localized nodes is executed in lesser field for higher accuracy.The...
Node localization is a fundamental and important technology in wireless sensor networks (WSNs). With regard to the mechanisms used for estimating location, existing localization algorithms can be divided into two categories: range-based and range-free. Compared with range-based schemes, range-free schemes do not need to measure or estimate distances or angles and are thus more suitable for WSNs. However,...
Node Localization plays an important role in the applications of wireless sensor networks (WSNs). The whole localization mechanism of WSN target nodes consists of three key steps, the identification and data exchange step, the range estimation step, and the position estimation step. Based on the RSSI (Received Signal Strength Indication) technology, the BP (Back Propagation)-loss channel model is...
The most advanced logistics solutions that are currently adopted in ports and terminals use RFID- and GPS-based technologies to identify and localize shipping containers in the yard. Nevertheless, because of the limits of these techniques, the position of containers is still affected by some errors or it cannot be determined in real-time. We propose a non-conventional approach where the position of...
Aiming at the positioning problem of Ad-Hoc networks of sensors node location, a beacon selected localization algorithm (BSLA) is proposed in this paper. The proposed method considers sufficiently both the topology relationship among beacons and the topology relationship between beacon nodes and unknown nodes. We introduce the concept of collinearity and apply it into the localization of the multihop...
The paper presents a multi-hop adaptive and iterative localization (MAIL) algorithm for localization wireless sensor network (WSN) nodes. The present study determines the uncertainty in the localization of nodes caused by the variation in the received signal strength or in the angle of arrival of a signal received by such nodes. An iterative localization algorithm is then proposed to decrease this...
The Self-Organization in WSN (Wireless Sensor Networks) is necessary because of the big number of nodes and the great variety and complexity of applications. The major concern in WSN Self-Organization is to maximize the networkpsilas Lifetime. In this paper we present a work where response time and Lifetime are the most important keys to take into account for better performance. We evaluate a proposed...
In this paper, we study the localization problem in large-scale Underwater Wireless Sensor Networks (UWSNs). Unlike in the terrestrial positioning, the global positioning system (GPS) can not work efficiently underwater. The limited bandwidth, the severely impaired channel and the cost of underwater equipment all makes the localization problem very challenging. Most current localization schemes are...
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