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Policies for Transmit Power Control in the Conditions of Jamming in Clustered Wireless System

100%

Michalak J.

tom Vol. 66, No. 4

679--685

This article presents a consistent solution of Transmit Power Control in centralized (clustered) wireless network with and without jamming. Depending on the policy assumed, appropriate solutions are applied to minimize the power used in a system or to satisfy expected Quality of Service. Because of specific nature of the system there is no optimal solution which can be applied in practice. Correctness and effectiveness of four proposed Transmit Power Control algorithms was presented in the form of computer simulation results in which the system capacity, mean power used and the number of successful links were described.

Location Accuracy of a Ground Station based on RSS in the Rice Channel

100%

Michalak J.

tom Vol. 30

577--580

The article presents the assessment of the potential accuracy of the location of the terrestrial radio signal source in the Rice channel using the received signal filtering and the non-linear regression function. The basic assumption for the parameterization of the channel was to use a drone with a simple antenna system and RSS analysis from multiple measurement points (Multilateration location). Preliminary results under Rice-typical channel conditions indicate position estimation errors of the order of 60 meters for K = 7, which in the assumed network structure is approximately 10% of the actual average distance. By using properly parameterized filtration systems (Kalman algorithm and Moving Average algorithm set), it is possible to increase this accuracy by one-third of the initial value.

Środowisko laboratoryjne do badania sieci sensorycznej opartej na układach serii Waspmote

63%

Skrocki R. , Michalak J.

tom Vol. 60, nr 3

14--16

W pracy przedstawiono opis środowiska laboratoryjnego do badania sieci sensorycznej, opartej o układy serii Waspmote firmy Libelium. Sieć działała zgodnie ze standardem IEEE 802.15.4. Zaprezentowano proces budowy stanowiska oraz wybrane warianty testowania sieci. Stanowisko może służyć do nauki uruchamiania węzłów i całej sieci z elementami programowania wybranych funkcjonalności.

The concept of laboratory set with Libelium Waspmote modules based on IEEE 802.15.4 standard was presented in this article. A complete process of the system activating was described. The set can be used for a sensor network testing with elements of the node programming.

Military suitability of COTS UAV due to the level of radiated emissions

63%

Przesmycki R. , Michalak J.

tom Vol. 72, nr 2

art. no. e148838

The article presents the assessment of the levels of radiated electromagnetic interference by commercial UAVs in the context of their popular use for various military tasks. The test was conducted in the frequency range from 30 MHz to 6 GHz, in an electromagnetically anechoic chamber, in accordance with the procedures provided for this type of checks. Apart from the control frequencies (which of course exceed the standards), it can be said that most of the tested UAVs using brushless motors do not exceed the emission levels specified by the military standard MIL-STD-461G. This opens the way to the use of COTS UAV as a carrier of electronic systems for the tasks of recognizing sources of radio signals in the investigated band.