GNSS technology has been used for many applications. Beside military applications, GNSS technology is used for mini UAVs-drones. One of the possible approaches for achieving anti-drone capabilities is a jamming receiver of GNSS at drone. The GNNS jammers broadcast jamming signal in the frequency band used for satellite navigation in order to deny service of GNSS. In this paper we have considered the possibility to generate optimal jamming signal to deny service of all GNSS. Some of the results are shown in this paper
The relentless expansion of communications services and applications in 5G networks and their further projected growth bring the challenge of necessary spectrum scarcity, a challenge which might be overcome using the concept of cognitive radio. Furthermore, an extremely high number of low-power devices are introduced by the concept of the Internet of Things (IoT), which also requires efficient energy usage and practically applicable device powering. Motivated by these facts, in this paper, we analyze a wirelessly powered underlay cognitive system based on a realistic case in which statistical channel state information (CSI) is available. In the system considered, the primary and the cognitive networks share the same spectrum band under the constraint of an interference threshold and a maximal tolerable outage permitted by the primary user. To adopt the system model in realistic IoT application scenarios in which network nodes are mobile, we consider the randomly moving cognitive user receiver. For the analyzed system, we derive the closed-form expressions for the outage probability, the outage capacity, and the ergodic capacity. The obtained analytical results are corroborated by an independent simulation method.
Modern systems for electronic warfare, especially systems for electronic support based on fast scanning wideband direction finders, are usually designed to achieve high scanning speed in order to provide high probability of detection of signals of interest. To achieve high scanning speed two parameters are important: the first is instantaneous bandwidth of a receiver and the second is processing speed. By increasing instantaneous bandwidth of the receiver, it is possible to increase scanning speed. However, increasing of instantaneous bandwidth has a direct impact at amount of processing power to keep the same or to increase processing speed. In modern systems for electronic support, scanning speed depends on instantaneous bandwidth of the receiver, frequency resolution, implemented methods for estimation of direction of arrival and required preprocessing and processing power of hardware. The latest computer system architectures being developed by the computer industry offers more processing power in a smaller footprint. Parallel computing has been rejuvenated with the development of multicore technologies such as Multicore Processors, Multicore Digital Signal Processors and General Purpose Graphics Processing Units. In this paper an approach of using GPGPUs in the wideband fast scanning direction finder has been considered. Some of the obtained results are also presented.
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