Time filter

Source Type

Maribor, Slovenia

Svecko J.,Margento R and D | Malajner M.,University of Maribor | Gleich D.,University of Maribor
ISA Transactions | Year: 2015

This paper presents a particle filter algorithm for distance estimation using multiple antennas on the receiver's side and only one transmitter, where a received signal strength indicator (RSSI) of radio frequency was used. Two different placements of antennas were considered (parallel and circular). The physical layer of IEEE standard 802.15.4 was used for communication between transmitter and receiver. The distance was estimated as the hidden state of a stochastic system and therefore a particle filter was implemented. The RSSI acquisitions were used for the computation of important weights within the particle filter algorithm. The weighted particles were re-sampled in order to ensure proper distribution and density. Log-normal and ground reflection propagation models were used for the modeling of a prior distribution within a Bayesian inference. © 2014 ISA. Published by Elsevier Ltd. All rights reserved.

Fras M.,Margento R and D | Mohorko J.,University of Maribor | Cucej Z.,University of Maribor
Informacije MIDEM | Year: 2011

The successes of military missions strongly depend on quality planning. The need for near-real time simulation tools has become apparent, which allows the realistic network planning and training of command personnel on real Command and Control Information Systems (C2IS). Real hardware and C2IS software are, in these cases, connected to the simulator via a Local Area Network, where the tactical radio communication infrastructure is simulated on a virtual terrain. Such simulation of the network runs real-time with the simulated use of the C2IS. Operators of C2IS systems can simultaneously evaluate the qualities of tactical networks from the points of view of network throughput, end-to-end delays, radio visibility, etc., for each individual tactical unit. This paper presents some simple examples of using this new simulation methodology, which can be easy adapted to more complex C2IS scenarios.

Fras M.,Margento R and D | Mohorko J.,University of Maribor | Cucej Z.,University of Maribor
Simulation | Year: 2011

Over recent years, in order to assist the evaluation, construction, and upgrade of communication networks, the need for the simulation of complex communication networks has increased. Traffic modeling has had a very large impact on network simulation reliability, which is usually statistically described for simulation purposes. Most often, the network traffic analysis is based on the captured packets. However, modeling of network traffic is usually described by statistics of data sources, from higher layers of a Transmission Control Protocol/Internet Protocol (TCP/IP) model. For these reasons, we have developed a method that allows distribution parameter estimation of the data-source process from captured packets. This method is based on the algorithm, which mimics defragmentation as opposite to the TCP/IP fragmentation and encapsulation processes. The proposed method achieves an accurate description of network traffic. © 2010 The Author(s).

Sadek U.,Margento R and D | Sadek U.,University of Maribor | Sarjas A.,University of Maribor | Svecko R.,University of Maribor | And 2 more authors.
IFAC Proceedings Volumes (IFAC-PapersOnline) | Year: 2015

This paper presents a concept and experimental results using FPGA to reduce voltage "spikes" and to remove the static voltage error of a DC-DC boost switching converter (SC), when load impedance is instantly changed. FPGA (Field Programmable Gate Array) has been used because of a high dynamic behavior of such systems. With FPGA it is possible to implement control algorithms to work in real time, with very low sampling periods. This can be achieved by parallel implementation of control algorithms. This paper also provides idea and experimental results of a load with changeable impedance for testing SC. © 2015, IFAC (International Federation of Automatic Control) Hosting by Elsevier Ltd. All rights reserved.

Blazinsek I.,Margento R and D | Kotnik B.,Margento R and D | Chowdhury A.,Margento R and D
ISA Transactions | Year: 2015

This paper presents the problems of implementation and adjustment (calibration) of a metrology engine embedded in NXP's EM773 series microcontroller. The metrology engine is used in a smart metering application to collect data about energy utilization and is controlled with the use of metrology engine adjustment (calibration) parameters. The aim of this research is to develop a method which would enable the operators to find and verify the optimum parameters which would ensure the best possible accuracy. Properly adjusted (calibrated) metrology engines can then be used as a base for variety of products used in smart and intelligent environments. This paper focuses on the problems encountered in the development, partial automatisation, implementation and verification of this method. © 2015 ISA.

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