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This paper innovatively proposes a shortwave direction finding (DF) and crossing location (CL) algorithm based on an improved clustering and outlier detection method. The proposed algorithm can reject the scattered azimuths and revise the error monitoring data using the improved clustering and outlier detection method. By practical verification, the quantified results prove that compared to the traditional...
Location estimation in wireless communications systems experiencing purely non-line-of-sight propagation paths is an open problem. In this paper, a novel least squares algorithm is presented to estimate the location of a mobile station (MS) experiencing purely non-line-of-sight communication with at least one base station (BS) by using the time of arrival (TOA), angle of arrival (AOA), and Doppler-shift...
This article shows the solution to the problem of designing a neuronetwork component of industrial technical system. This solution lets to provide nominal accuracy of information processing, when technical system is working under conditions of destabilizing factors. Base of designing a neuronetwork component is algorithms of elimination of influence of external and internal noise of artificial neural...
Some electrical equipment tests are destructive tests. These tests check the behavior of the equipment during the transients of currents and voltages. Frequently, the time interval of the test is several tens or hundreds milliseconds. The human observer cannot analyze the parameters of interest that characterize the evolution of equipment. Therefore, the computer assisted transient recorders are used...
Linked Open Data provides a distributed model for the semantic web to create knowledge by publishing public available data and meaningfully interlinking dispersed data sources. It is undeniable that the realization of this goal depends strongly on the quality of the published data. Since, data quality is a multi-dimensional concept which is defined by a number of quality factors, in order to study...
Least Square (LS) estimation is a simple but not good enough for localization method which is widely used for target position estimation. The time difference of arrival (TDOA) location based on LS method needs to select a reference sensor to obtain a series of equations. Thus, the measured error of the selected first sensor will certainly influence the location accuracy. In our article, an algorithm...
In this paper, methods to improve a practical Time Difference of Arrival (TDOA) based source localization system are investigated. Firstly, our previous work on the development of a TDOA based source localization system using reconfigurable Software Defined Radios (SDRs) is described in detail. The system can achieve less than 100m error in a coverage of several kilometers. However, the performance...
Foi efficient wide-area exploration by an autonomous planetary rover, the generation of a global environmental map is very important. A global map is generated by matching and overlapping terrain features from digital elevation maps that are obtained during a rover traveling in a region. Each set of data contains information in different areas, and the overlapping part in each set of data may be missing...
In practical applications, the accuracy of a LPS is often affected by non-line-of-sight (NLOS) errors which disable proper locating results. In this article, a robust localization algorithm capable of minimizing the effects of NLOS errors during position estimation is presented. The robust localization algorithm uses hyperbolic multilateration in combination with proximity based grouping and final...
Pedestrian dead reckoning (PDR) is widely used for indoor localisation. Its principle is to recursively update the location of the pedestrian by using step length and step heading. A common method to estimate the heading in PDR is to use magnetometer measurements. However, unlike outdoor environments, the Earth's magnetic field is strongly perturbed inside buildings making the magnetometer measurements...
Wide Area Multilateration (WAM) is a useful aeronautical surveillance system which is able to achieve high performance. However, WAM has a drawback in which position errors increase rapidly outside a constellation of receiver stations in principle. One of the solutions for the drawback is to apply a measured range between a receiver station and an aircraft to the Time Difference of Arrival (TDOA)...
LRL technique for calibrating the automatic network analyzer is presented. LRL technique is a variation of TRL, it is especially useful for microwave, non-coaxial environments. This technique would enhance the accuracy extent of calibration. Detailed information about the choice of LRL calibration kits and LRL calibration steps are given. In addition, an measurement example using LRL calibration approves...
Generators are the key equipment to determine the characteristics of power system dynamic behavior, the accuracy of generators' mathematical model and parameters will directly affect the results of power system dynamic simulation. Therefore, it is particularly important to assess the accuracy of generators' simulation model. In this paper, accuracy indices were proposed to evaluate the generator dynamic...
This paper provides more detailed information on the application of the International Performance Measurement and Verification Protocol (IPMVP) guideline in the determination and reporting of energy savings. It stresses the need, the importance and an approach that can be used to report energy savings accurately in Measurement and Verification (M&V). The paper focusses on the fundamentals and...
The use of Long Baseline (LBL) systems for localizing underwater vehicles is quite consolidated, as they guarantee a good nominal accuracy, not dependent on the operative depth and almost constant at any point inside the area delimited by the transponders. However the real achievable accuracy can be affected by different factors, mainly related with the knowledge of some environmental parameters (like...
Simulation is a critical tool for evaluating processor and program performance and behavior in newly proposed computer architectures. When modeling target machines with hundreds or thousands of cores, parallel simulation approaches are an increasingly popular method to reduce the long simulation times inherent in single-threaded simulation. Unfortunately, synchronization forces a tradeoffs between...
Localization errors can play an important role in measurements of radio propagation or spectrum utilization, especially in urban environment where GPS localization accuracy is highly varying. In this paper we present a low cost and simple method for mitigating the impact of localization errors, based on multiple GPS receivers. The presented results are based primarily on performance evaluation of...
Commercial wave buoys, while accurate and reliable, utilize high specification components which can render the cost of deployment and maintenance prohibitively high for many applications. This paper describes the deployment of Tyndall Wireless Inertial Measurement Units (WIMUs) as applied to measurement of ocean waves. These inertial measurement units are miniature devices which combine a microcontroller,...
A portable error simulator for evaluating voltage transformer test set(VTTS) using a voltage divider consisting the serial combination of the resistor and capacitor was developed. The error simulator was applied to the calibration of several type commercial current-comparator-based VTTS and covered the ratio error and phase error range up to ±10 % and ±15 crad, respectively. From the calculated and...
We present the comparison of results from the generation and the measurement of direct currents in the pA range, performed with traceable state-of-the-art methods at highest accuracy. The currents were generated with the capacitor charging method, and measured with the first prototype of a novel picoammeter developed at PTB. The results confirm the agreement between both methods and the linearity...
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