The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
To obtain a trade-off between location accuracy and implementation cost, recursive localization schemes are being pursued as a cost-effective alternative to more expensive localization approaches, where localization information increases progressively as new nodes compute their positions and become themselves reference nodes. A strategy is then required to control and maintain the distribution of...
At the present time, noise pollution is a phenomenon that affects millions of people around the world. It causes several inconveniences due to automotive traffic, airplanes, construction equipment, factories, personal noise, and others. Noise pollution is an unpleasant noise created by people, electronic devices, or mechanical elements. Noise pollution has negative consequences to human health such...
Aiming at the problem of the localization error and localization coverage rate of wireless sensor network nodes, a range-based distributed localization algorithm is proposed in this paper. The algorithm can reduce the localization error by introducing the confidence factor that makes the credibility as weights adding to the coordinate calculation of the unknown nodes. Simulation results show that...
An important aspect of wireless sensor networks operation is identifying the physical location of each sensor in a 3-D space — a process known as localization. Typically, localization uses the position of known reference points or anchors, and estimates of distance to anchors to estimate the position of unknown nodes. An alternative of using fixed anchors is to use mobile anchors whose position can...
Localization is one of the key technologies in wireless sensor networks (WSNs), since it provides fundamental support for many location-aware protocols and applications. Constraints on cost and power consumption make it infeasible to equip each sensor node in the network with a global position system (GPS) unit, especially for large-scale WSNs. A promising method to localize unknown nodes is to use...
During its whole service life, a building can be subjected to operational and environmental forces usually present, or to episodic seismic loadings (earthquakes). An automated smart building is a house capable of self-monitoring in order to signal the need of maintenance, when a reduction in performance levels is detects, or to signal the need of action if there are some structural problems. One of...
This paper extends the work in [4] by introducing the neighborhood querying process for reducing the effects of sensor observation errors. The objective of this work is to track moving objects by using one-bit information from sensor nodes that provide information whether an object is moving towards a group of sensors or moving away. In [3], they allowed that sensor nodes make observation errors but...
Multilateration is a well-known technique for localization in Wireless Sensor Network (WSN). However, due to some assumptions regarding certain parameters and approximations used in case of multilateration algorithm, the computed co-ordinates of a node may be erroneous. The magnitude of error can be cumulative in nature. Two sets of three beacon nodes are placed at two opposite sides of the network...
Determining the positions of unknown position nodes, especially mobile nodes in a wireless sensor network (WSN), is critical for many applications. It helps to identify the location of the collected data and of the node carrier such as a worker, patient or vehicle. This information is often critical on supporting the right (time) decisions. This paper presents a scalable localization system targeting...
Localization of nodes is a very crucial issue in many wireless sensor network (WSN) applications. In this paper, we consider a WSN initially consisting of a single location-aware mobile anchor nodes and a number of location-unaware, stationary nodes, and propose two algorithms to localize the unknown nodes using the mobile anchor nodes. We can obtain the location information of the unknown nodes through...
Localization is one of the fundamental problems in wireless sensor networks (WSNs), since locations of the sensor nodes are critical to both network operations and to most of the application level tasks. There exists an extensive body of paper that aims at obtaining locations as well as spatial relations of nodes in WSNs without requiring specialized hardware and/or employing only a limited number...
This paper presents an indoor positioning technique using a modified probabilistic neural network (MPNN) scheme. It measures the received signal strength (RSS) between an object and stations, and then transforms the RSS into distances. A MPNN engine determines coordinate of the object with the input distances. The experiments are conducted in a realistic ZigBee sensor network. The proposed approach...
In wireless sensor networks, the positioning scheme using the received signal strength (RSS) has been widely considered due to its simplicity. Appropriate estimation of path-loss exponent (PLE) between a sensor node and an anchor node plays a key role in reducing position error in this RSS-based positioning. In the conventional researches, a sensor node directly uses the PLEs given by its neighboring...
Distributed Address Assignment Mechanism (DAAM) has been suggested to be used in the ZigBee tree topology for its simplicity and efficiency. However, its topological parameter restricts the shape and extent of the networks, and results in orphan problem and poor coverage. Three alternatives are proposed and evaluated in this article. 2-layer DAAM (2DAAM) uses hierarchical scheme, which divides the...
Localization in WSN used to determine the position of node with the help of known positions of anchor nodes. In many of the applications, where coarse accuracy is sufficient, range free localization mechanism are being pursued alternative to range based localization mechanism. Because the range free localization scheme is low cost and consumes low energy. In this paper, we present range free weighted...
We consider the problem of sensor localization in a wireless network in a multipath environment, where time and angle of arrival information are available at each sensor. We propose a distributed algorithm based on belief propagation, which allows sensors to cooperatively self-localize with respect to one single anchor in a multihop network. Simulations show that although the network is loopy, the...
The wireless sensor network node localization algorithms are studied more and more at present, but most are based on two-dimensional localization algorithm for three-dimensional localization of too few. Based on the researches on the classic two-dimensional localization algorithm, and the trilateration was extended to three-dimensional localization algorithm. Error analysis of this algorithm was revealed...
The Localization is an important topic in wireless sensor networks (WSN). In this paper, an improved Sum-Dist approach is used to reduce the impact of distance measurement errors on the location estimate. In addition, the proposed strategy to get accurate position of the unknown sensor using by using a minimum numbers of anchor nodes can reduce the final localization error. The simulation results...
The development of wireless sensor network (WSN) technologies has become very important in recent years, especially in the domain of electronic healthcare. The rate of falling down happened in elderly people is about 15% to 40% every year, and the times of fall will increase along with their age. Most of the fall will cause the elderly people to be hospitalized, or to reside in nursing home, and it...
Wireless sensor networks are becoming more widely used in various fields. Localization is a crucial and essential issue for sensor network applications. In this paper, we propose a simple, distributed and low cost localization algorithm which approaches the benefits of range-free schemes. The proposed algorithm utilizes the location information of neighbor anchor nodes to estimate the intersection...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.