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.
A wireless ad-hoc network is a collection of nodes that are dynamically and arbitrarily located in such a manner that the interconnections between each node are capable of changing on a continual basis. In this paper, we provide a novel way to improve node interconnects without changing the overall network topology by allowing nodes to have limited mobility. Received signal strength (RSS) measurements...
This paper provides results of radio channel measurement campaign carried out in the intra vehicle environment for ultra-wide band (UWB) and millimeter wave (MMW) frequency bands, namely 3–11 GHz and 55–65 GHz. In discussed frequency bands, we present and compare channel impulse responses (CIRs) for various antenna locations while considering the effect of passengers presence. On the basis of performed...
This paper introduces a novel approach to model Received Signal Strength (RSS) measurements in cellular networks for user positioning needs. The RSS measurements are simulated by constructing a synthetic statistical cellular network, based on empirical data collected from a real life network. These statistics include conventional path loss model parameters, shadowing phenomenon including spatial correlation,...
For a long time, China coal mine production lacks methods to fulfill real-time monitoring and information management. A low frequency RFID-based data acquisition system is introduced in this article, a new way of collecting data from underground equipment and sensors are presented as well. The principles and design of hardware and software of this system were introduced. Through trial and practice,...
The DockingAssist system is a centralised, cost-effective, real-time navigation system that provides the necessary centimetre positioning and speed accuracy to ensure efficient and safe manoeuvring within a entire port area, thereby enhancing vessel trajectory and providing constant monitoring of moored/docked vessels. By reducing transit, this system will result in improved port traffic management...
Localization of users is an important part of location aware systems and smart environments. It forms a major data source for superimposed intention recognition systems. In RF device-free localization (DFL), the person being tracked does not need to wear a RF transmitter or receiver in order to be located. Instead, they are tracked using the changes in signal strength measured on static links in a...
In this paper, we propose a method that estimates the direction of a set of User Equipment (UE) more accurately for Enhanced Cell-ID (ECID) positioning of a cellular system than the conventional sector based positioning method. The proposed method estimates the direction of the UE using the number of observations in reception sectors. The average received power ratio of the reception sectors is calculated...
In this paper, we introduce a novel antenna positioning algorithm based on skeleton extraction. Indoor distribution of antennas is highly depending on the plane structure of the building, and thus skeleton extraction can be immediately applied to locating where antennas should be placed. We divided the plane structure of a building into several sub-areas, extracted the skeletons of all the sub-areas,...
Radio navigation system always makes use ground wave for navigation and positioning.. The calculation on ground wave signal field strength is the theoretical basis of the whole system design, which decides the working area, the sensitivity of receiver and the dynamic range of the system. Because ground wave usually transmits over mediums just like sea surface, hill, everglade, which have different...
Radio Frequency Identification (RFID) is a wireless system designed to identify the presence of objects attached by tags. In recent times, RFID is also used for positioning purposes. We show a scenario of wireless propagation observed by eight antennas with different polarization located in different positions. In this way, the polarization and diagram radiation of the antennas will play a significant...
This article established a double antennas positioning method and system model. Considering the impact of white Gaussian noise, SNR difference and time difference of arrival of dual-antenna can be calculated at the receiving end to make equations in multi-path fading channel. In the space of two-dimensional the wave source location can be expressed as the function of SNR difference and time difference.
"The Marauder's Map" is a magical map in J. K. Rowling's fantasy series, "Harry Potter and the Prisoner of Azkaban". It shows all moving objects within the boundary of the "Hogwarts School of Witchcraft and Wizardry". In this paper, we introduce a similar attack to location privacy in wireless networks. Our system, namely the digital Marauder's map, can reveal the locations...
Although high-resolution remote sensing (RS) images can supplement the reference map's deficiency in LADAR (Laser Radar) referenced navigation system over plain area, their different imaging modes still leave great errors' introduction into the positioning process. As positioning is commonly accomplished by matching the edges extracted as the obvious terrain characteristics, exploring automatic procedure...
In this paper, a method of estimating both the position and the rotation angle of an object on a measurement stage was proposed. The system utilizes the radio communication technology and the directivity of an antenna. As the preliminary study, an experimental system that employs RFID technology was developed. Two RFID tags are used for estimating the location of one target object. The experimental...
This paper introduces a novel implementation of direction-of-arrival (DOA) estimation for localization of nodes in (mobile) ad-hoc networks. The localization technique is being implemented on a software defined radio (SDR) system. The SDR system needs DOA estimation for: (a) beam-forming and detection, and (b) localization. The detection process needs coarse DOA estimation, while the localization...
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.