Increasing requirements in the field of security, in particular in the transport sector, the rescue work, the inviolability of private property and others urged to research work in the field of radar monitoring people, vehicles or other objects in the environment that not allow make so using the most popular and available technology for production and analysis of video images. These conditions of poor visibility, or even lack thereof, are darkness, bad weather, smoke, dust, wall (roof) buildings and the vehicle body. Existing instruments and special equipment occupy a certain niche in this area, mainly for counter-terrorism operations. However, such equipment is not readily available and extremely high price. In the paper presented research is development of the group’s existing radar technology in the field of location through opaque obstacles.
Abstract. The compressive sensing (CS) theory says that for some kind of signals there is no need to keep or transfer all the data acquired accordingly to the Nyquist criterion. In this work we investigate if the CS approach is applicable for recording and analysis of radio astronomy (RA) signals. Since CS methods are applicable for the signals with sparse (and compressible) representations, the compressibility of RA signals is verified. As a result, we identify which RA signals can be processed using CS, find the parameters which can improve or degrade CS application to RA results, describe the optimum way how to perform signal filtering in CS applications. Also, a range of virtual LabVIEW instruments are created for the signal analysis with the CS theory.
Abstract. In renewable energy generation systems energy storage is needed not only to supply power when there is no generation. but also for short term smoothening of the electricity supply. The Quasi-Z-source Inverter (qZSI) allows to integrate energy storage in addition to the other energy sources mainly for output power smoothening. In the paper analysis of the scientific papers is given about this kind of converters and also theoretical and simulation based analysis of basic relations, control principles and scientific analysis that reveals limitations and passive component selection. Also the design of the proportional-resonant controller will be analyzed and discussed in more detail.
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