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This article describes the methods and tools to verify the location of nodes in wireless sensor networks. Software product that allows to analyze the positioning based on the distance with different algorithms is proposed. As a result of simulation the next statistical output variables are defined: percentage of nodes, which have position determined; minimum, maximum and average error in assessing...
In this paper, we describe a method to position a group of avatars in a virtual environment. The method aims at a group setting that seems natural for a group of people attending a guided tour and was developed in particular to assist participants by autonomously positioning their avatars on each stop of a virtual tour. The geometry of the virtual environment is key input, but also engagement of participants...
This article is a case study, based on Participant Observation, which focuses on a digital platform which manages assets. This platform is for sale in different countries, including Portugal and Mozambique. As national cultures and institutions differ from country to country and as this is all the more the case when different continents are at stake, we herein discuss the adaptation of products and...
We present a real-time TDOA localization testbed utilizing software defined radio and GPS based synchronization. A distributed software stack enables the localization of unknown signals by transporting the recorded baseband samples of several sensors over a backhaul network for centralized signal processing in a fusion center. To overcome the relatively large drifts of synchronization signals provided...
This paper describes a novel method to design a simple real time GPS (Global Positioning System) receiver system for navigation, positioning and tracking applications. This system is developed to provide various positioning and navigational parameters like latitude, longitude, velocity, altitude, the name of the current location etc. This system also provides information regarding the satellites which...
The expansion of Wireless Local Area Networks (WLAN) especially the advances in localization based technologies has generated a growing interest in an indoor Wireless Positioning Systems (WPS) based on WLAN infrastructure. This paper presents the preliminary study on two indoor positioning techniques, known as fingerprinting and clustering technique by leveraging the existing Wireless Local Area Network...
Indoor positioning has focused the interest of researchers for years. Although there are several techniques proposed, they are difficult to reproduce and consequently to contrast and improve. This paper presents a modular location platform, which enhances the SoftMAC implementation in Linux with positioning capabilities. This platform can be deployed in any device running Linux kernel 2.6 or higher...
Time-based multilateration in IEEE 802.11 networks usually involves custom hardware designs, which tend to slow down the implementation and deployment of the location system. This paper presents software for calculating time-based location observables. This software enhances the SoftMAC layer of the Linux operating system by adding location-related measuring capabilities. A plugin for calculating...
Underpinned by the accuracy of GNSS technologies the Volumetric Navigation System (VNS) concept introduces the opportunity of working not only with positions for identifying the location of any moving vehicle, but also with the capacity to manage the geo- referenced volume associated to the vehicle. This issue allows a safer navigation and traffic interaction especially in scenarios involving large...
During the testing process of the helmet-mounted display's performance, HMD (helmet-mounted display) should aim at the binocular FOV (field of view), so the system using camera instead of eyes to capture image and measure the aberration is designed. The Testing System is based on the optics, integrated with machine, electronics, computer, automatic control technology and image processing technology...
Development of context sensitive applications has evolved rapidly in the past. Context sensing is hereby mostly realized with small sensors or embedded devices. This paper describes a distributed approach to use data from mobile sensor networks for user interaction and use in a broad variety of different use cases. It gives a short introduction to the used active RFID technology, then focuses on some...
In accordance with the requirement of playing music, a music playing robot for performing a piece on a xylophone is developed. The principle and technique of simulation design is introduced. Three dimensions model of the robot is built by SolidWorks software. Parameterized design, virtual assembly, motion simulation and optimization design of the robot have been discussed. Diagrammatic curve of motion...
The Institute of Navigation and Satellite Geodesy of the Graz University of Technology is involved in many projects and developments to determine GNSS-based trajectories for demanding applications. Examples demonstrating the capabilities and limits of GNSS-based positioning under detrimental conditions are: positioning and guidance of visually impaired pedestrians, search and rescue applications,...
Increased focus towards improved detector spatial resolution in PET has led to the use of smaller crystals in some form of light sharing detector design. In this work we evaluate two sampling techniques that can be applied during calibrations for pixelated detector designs in order to improve the reconstructed spatial resolution. The inter-crystal positioning technique utilizes sub-sampling in the...
In this paper, a platform for managing and providing remote access to robots was developed and constructed. The system helps to schedule, perform and analyze experiments using minirobots. A solution for recharging the robots automatically has been included in the system in order to save the time needed for manual recharging. The system can automatically interrupt the experiments, charge robots and...
In this paper we describe a low cost testbed that integrates various technologies to offer a mixed set of multimedia and augmented reality (AR) contents to mobile users that are visiting a cultural site. Different technologies, such as Wi-Fi, Bluetooth and GPS, are integrated in a flexible architecture to provide indoor/outdoor location-aware services on commercial handheld devices. A real case of...
There is an increasing demand for finding a mobile location in areas such as robotics applications, electronic warfare positioning, wireless communication systems and vehicle security. Angle of arrival (AOA) is one of the key techniques in wireless location estimation. Location estimation is done by using standard triangulation operations that are usually implemented in software. In this paper, we...
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