Reconfigurable intelligent surfaces (RISs) are promising and relatively low-cost tools for improving signal propagation in wireless communications. A RIS assists a base station (BS) optimizing the channel maximizing its capacity by dynamically manipulating reflected field. Typically, RISs based on reconfigurable reflectarrays (RAs), i.e., 2-D arrays of passive patch antennas, individually switchable between two or more reflection phases. The spatial resolution provided field patterns is...

Due to the small number of annotated radar image datasets, use optical images for training neural networks designed detect objects in seems promising. However, have some significant differences from and an experimental investigation this possibility is required. In work we investigate applicability such approach show that case detection ships good results can be achieved. addition, it shown preliminary filtering speckle noise improve results.

The paper describes the implementation and testing of two synthetic aperture radar processing algorithms on Jetson TX1 platform using ArrayFire parallel library. Their execution time was compared when Jetson's multicore CPU GPU. Comparison also done with a desktop computer. It discovered that GPU computing is faster for both to its CPU. However, results computer depend type an algorithm.

This paper discusses the problems and methods of radiofrequency (RF) pulse parameters measurement. The frequency is assumed to be not known. purpose this work find out how accurately it possible measure signals. definitions main are discussed. method for estimating time a (pulse width, rise fall time) amplitude described in detail. In addition, measuring tilt overshoot proposed. description simulation procedure given. simulations were performed using synthetic test signals with various...

In this letter, we investigate a new way of quantization lobe suppression in 1-bit reconfigurable intelligent surfaces (RISs). Typically, RISs are 2-D arrays passive array elements, where the phase reflection from any element can be one two states. However, use only phases results appearance so called lobes scattering pattern. A method for is described and its performance studied detail by numerical simulation experimental investigation using 5-GHz Wi-Fi band modular RIS. The based on...

The reduction of speckle noise is an important part synthetic aperture radar image processing. In the process, it necessary to select values some filter parameters that will give highest processing quality. To such parameters, many authors use quality assessment metrics. question, however, which available metrics optimal for this task. article presents a comparison applied filtering on SAR images. For purpose, specially designed test and algorithm finding filters, developed by authors, are...

In this work, we present the simple and effective method of quantization lobe reduction in 1-bit intelligent reflective surfaces (reflectarrays). We show that significant lobes which appear case a reflectarray under plane wave incidence can be reduced by shifting parts (tiles) direction perpendicular to its plane. Simulations using an array with 4 tiles reduces several dB insignificant loss main directivity. The aperture split into more than four parts, but increases complexity IRS...

The paper discusses application of a genetic algorithm to increasing the coverage area 5G FR2 and 6G millimeter wave base station using Reconfigurable Intelligent Surfaces (RIS) cover shadow zones behind obstacles. RISs are installed on board unmanned aerial vehicles (UAV) that can change their positions easily. It is shown significant increase in be achieved.

The paper compares several neural network (NN) architectures for suppression of multiplicative noise. images may contain sharp boundaries and large homogeneous areas. Convolutional fully connected networks are investigated. It is shown that different require significantly amount training data to reach the same noise quality. Examples NN requiring lower amounts presented.

Synthetic aperture radars are widely used to obtain high-resolution radar images without the influence of weather and lighting conditions, at large distances in a wide swath. Object detection classification is one main tasks image processing. One ways do this use convolutional neural networks. However, network training requires set (dataset). There few datasets public domain they not labeled. This article discusses possibility using networks trained on optical for detecting classifying...

Problems of pulse detection with unknown parameters are discussed. Detection long signals if the duration exceeds detector sliding windows is considered. A widely used adaptive windows, known as cell averaging constant false alarm rate (CA-CFAR) detector, investigated in detail. It shown, that use guard intervals between analyzed sample and helps to significantly increase probability correct signals. also shown different lengths these trains comparison identical interval lengths. The results...

In this article, the authors investigate an urgent problem for Belgorod region related to provision of agro-industrial complex with highly qualified and innovation-oriented personnel. The results sociological research carried out by convincingly indicate existence a significant gap between requirements modern employers workers quality knowledge, skills abilities that university graduates currently possess. overly theoretical nature education received its isolation from realities production...

In this work, we present a design-and-manufacture-friendly method for quantization lobes suppression in intelligent reflective surfaces (IRS). Rotation of the 4 identical equally spaced subarrays around their diagonals allows significant compared to panel shift method. Modeling 20 × array shows that can suppress by more than 10dB with very low losses main lobe gain.

The paper presents a fast an efficient pedestrian detection method using computer vision. is based on multistage approach combining motion or change detectors with heuristics and small size convolutional neural networks (CNN). faster than direct application of larger CNNs but produces comparable results. Possible the in 5G/6G millimeter wave communication systems discussed.

The paper describes the implementation of a semiconductor laser short pulse source. diode operates in gain switch mode. Design and testing source are described as well some problems solutions to them. shortest generate has duration 250 picosecond.

Measurement of coil deformation in pulsed high magnetic field is an important problem power electrical engineering. Small deformations (in the micrometer region) need to be measured with accuracy using a small footprint (about 1 cm or less) sensor. Unfortunately, current (from several tens kA and more) corresponding electromagnetic create strong interference that makes it nearly impossible use many types electronic sensors. Fiber optic sensors are sensitive not affected by fields thus very...

Reconfigurable Intelligent Surfaces (RISs) are promising and relatively low-cost tools for improving signal propagation in wireless communications. An RIS assists a base station optimizing the channel maximizing its capacity by dynamically manipulating with reflected field. Typically, RISs based on reconfigurable reflectarrays, i.e. two-dimensional arrays of passive patch antennas, individually switchable between two or more reflection phases. Different communication scenarios environments...

The paper presents a system for the Intelligent Reflective Surface beam steering using computer vision algorithm based on TinyYOLOv4 neural network. It is implemented low-power single-board NVIDIA Jetson Nano. We demonstrate that combination of reconfigurable antenna arrays and algorithms (including detection, recognition tracking objects) can be used to find patterns optimally redirects base station signal mobile user equipment.

Introduction. A radar image is an obtained by remote sensing the earth's surface with a device. Radar images are characterized background graininess caused speckle noise, which should be filtered to improve quality of images. The structure noise reduction filters often comprise one or more parameters control level smoothing. values these have selected experimentally. In works devoted filtering, methods used for selecting filter paraments rarely clarified. Aim. To present methodology...

The results of the effect low-intensity laser radiation on lipid peroxidation and sorption capacity erythrocyte membranes under stress are presented. membrane-stabilizing a decrease in rate free radical processes noted, which indicates prospects using as an activator body's natural antioxidant systems. An increase proves advisability to adaptive protect body from stress.