Real Time Localization System (RTLS). Research Papers (original) (raw)
—The paper describes principles of angle of arrival estimation using an anchor and a tag which are built around Decawave's DW1000 impulse radio ultra-wideband IC. Typical experimental results are provided that show the performance of... more
—The paper describes principles of angle of arrival estimation using an anchor and a tag which are built around Decawave's DW1000 impulse radio ultra-wideband IC. Typical experimental results are provided that show the performance of Decawave's AOA demo kit based on this architecture. Keywords—Angle of arrival (AOA); Impulse Radio (IR); Ultra-Wideband (UWB); Real Time Localization System (RTLS).
Ultra Wide Band techology and its use in real-time localization systems by means of two-way ranging, one-way ranging and time difference-of-arrival algorithms.
Determining the location of objects, for example roadheader in a hard coal mine, is a task that should be automated in the conditions of state-of-the-art mining. Current solutions do notmeet the user’s expectations due to the lack of the... more
Determining the location of objects, for example roadheader in a hard coal mine, is a task that should be automated in the conditions of state-of-the-art mining. Current solutions do notmeet the user’s expectations due to the lack of the possibility of automation, maladjustment to theenvironment of a hard coal mine or not meeting the legal requirements. The article describes theinitial stage of work on an automatic system for determining the position of machines in difficultunderground conditions, including the analysis of requirements and constraints, an overview of available solutions, technologies and algorithms, as a result of which devices were selected forfurther tests. To determine the location, it is necessary to take distance measurements with high accuracy, despite the disturbances resulting from the working environment. Ultrasonic devices were selected and then tested under various operating conditions, including different distances between the transmitter and receiver as well as different directions and intensities of air movement that coulddistort the measurement results. During tests, sufficient accuracy, as well as other parameters, of the ultrasonic transducers were confirmed, allowing for distance measurements in the required range, suitable for use in the real-time locating system (RTLS) being developed.
Up to now, different indoor positioning algorithms based on Active RFID technology have been presented. These algorithms use the concept of reference tags to locate tracking tags that are attached to objects. Experimental results have... more
Up to now, different indoor positioning algorithms based on Active RFID technology have been presented. These algorithms use the concept of reference tags to locate tracking tags that are attached to objects. Experimental results have shown that the increase of reference tags caused the increase of positioning accuracy. However if the number of these reference tags exceeds a limit two problems can arise. The first problem is the increase of multipath propagation and signal interference. The second problem is the increase of cost. In order to improve the performance of indoor environment this paper presents a new method to estimate the tracking tags' location based on virtual reference tags instead of increasing the number of real reference tags. In this method after calculating RSSI of each virtual reference tag by its surrounding real reference tags RSSI, sensing area is divided into several sections and tracking tags location is calculated by real or virtual reference tags which are in section that the objects has the highest probability to be enclosed within. Experimental results show that our purposed algorithm considerably reduced error estimation of previous algorithms. In comparison with LANDMARC and VIRE approach, we reduced average estimation error by about 70 percent and 10 percent respectively.