The purpose of this work is to create a model of a system for constructing 2D images of radio light sources, where reception is based on correlation processing of signals coming from receiving antennas placed apart in space. In this article radio light refers to ultrawideband noise-like microwave radiation. Methods. To achieve this goal, a method for constructing an image is proposed and its implementation is tested using computer modeling of an imaging system. Results. It is shown how, using correlation signal processing methods, it is possible to construct 2D images of radio light sources using the example of computer modeling. Images of radio light sources were obtained, where it is possible to observe in one image two sources with a difference in the level of the emitted signal of 12 dB. Conclusion. A computer model of a correlation-based radio light receiver has been developed, which makes it possible to evaluate the influence of the number of antennas on the final image, as well as to obtain images of several radio light sources. The results of the computer simulation can be used to create a model of a real imaging system for radio light based on correlation processing.

The aim of this paper is to analyze statistical characteristics of the new differential communication scheme based on chaotic radio pulses in the presence of additive white noise (Gaussian) and using various distributions of instantaneous values of the chaotic signal. The characteristic feature of the presented scheme is the usage of significantly shorter time delays compared to the classical differential chaotic shift keying (DCSK) scheme. In order to investigate noise immunity of the direct chaotic differential communication (DC2) scheme, numerical statistical simulation is performed in terms of the bit error probability (BER) of the transmitted information. Then, the results of this simulation are compared to the results of analytical research. It is shown that due to the inherent internal noises of the scheme, the bit error probability (BER) for arbitrarily large values of the ratio of the signal energy to the Gaussian noise spectral density (Eb/N0) is higher than 10−3 for the values of processing gain K < 30 for any distribution of instantaneous values of the chaotic signal. With the increase of the K values, there is a rapid decrease in BER in a system with a channel without white noise. Numeric simulation is performed, which verifies and clarifies the analytical estimates obtained earlier regarding the bit error probabilities as functions of processing gain and ratio of the signal energy to the Gaussian noise spectral density. The minimum values of Eb/N0 are obtained, which provide necessary error probabilities with the processing gain set. It is shown that with a high processing gain (K > 30), the communication scheme considered here operates effectively both in a channel without fluctuation noises and in a channel with additive white Gaussian noise. The statistical characteristics of the proposed scheme do not depend on the choice of a particular distribution of instantaneous values of the chaotic signal. Taking into account that the scheme uses short delays, which do not depend on the processing gain of the used signal and are easily implemented, for example, on fragments of a high-frequency cable, the results obtained show good prospects for its implementation in a physical experiment.

The report discusses the development trends in the development of ultra-wideband wire-less communications based on chaotic signals. For the first time, direct chaotic communications were proposed in 2000 as a way to use noise-like (chaotic) signals for communication systems. The idea was to generate information-carrying signals directly in the region of radio or microwave frequencies where transmission takes place, and to modulate and demodulate these signals there without resorting to frequency transfer operations. In the basic version of the scheme, chaotic radio pulses were used as an information carrier, which made it possible to use “on-off” modulation and modulation of the positions of chaotic radio pulses. An envelope detector matched with the transmitted signal was used as a receiver. Another variant of the direct chaotic system is the recently proposed relative transmission scheme based on chaotic radio pulses. The report examines the characteristics and specifics of both schemes when used in ultra-wideband wire-less communication in the centimeter and decimeter wavelength ranges.

The purpose of this paper is to analyse the statistical characteristics of a Direct Chaotic Differentially Coherent communication scheme based on chaotic radio pulses in a communication channel with additive white Gaussian noise, where the chaotic signal is given by different instantaneous distributions. Methods. To achieve this goal, numerical modelling of the noise immunity of Direct Chaotic Differentially Coherent communication is conducted and compared with the results of analytical research. Results. The regularities associated with the use of chaotic signals with various statistical distributions of instantaneous values were studied. The minimum values of energy per bit to white Gaussian noise power spectral density ratio were obtained, providing the required error probabilities. Conclusion. It is shown that the proposed system works efficiently at high values of processing gain, and as the processing gain increases, the dependence of noise immunity on the specific statistical distribution of the chaotic signal is levelled out.

A method for receiving ultra-wideband noise-like microwave radiation, “radio light,” based on the correlation reception of signals from spatially separated receiving antennas, is considered in order to further efficiently form images of a medium illuminated by radio light. A mathematical model has been developed to study the formed response of the receiving system and evaluate the influence of the signal accumulation time on its dynamic range. One-dimensional responses of the correlation receiving system to point sources of radiation, which were used as radio light sources, are obtained. An experimental model of a radio light correlation receiver has been developed and physical experiments have been carried out with it, confirming the results of the simulation, as well as the efficiency of the proposed approach in general.

The problem of construction of ultra-wideband direct chaotic communication devices in the very high frequency and ultra high frequency ranges of radio waves is considered, the features of this range with respect to the propagation of electromagnetic radiation are discussed, and performance potential is evaluated. Experimental direct chaotic transceivers with a working band of 200–450 MHz, their structure, technical implementation, and characteristics are presented. The results of laboratory and field tests of prototypes are given to demonstrate transmission ranges of up to 1.5 km, which correspond to the calculated characteristics.

The possibility of creation of biological eye analogue working in radio-frequency is considered in order to observe the environment using artificial radiolight. In accordance with its biological prototype, this analogue consists of system of sensitive elements (retina), lens-like focusing element and the set of directional antennas that are used for primary processing of received noise-like ultrawideband radiation. The experimental device of this type is proposed and its performance is demonstrated.

The possibility of creating an analog of the biological eye in the radio range for observing the surrounding space in artificial radio light is considered. As in the biological prototype, the analog has a system of sensitive elements (retina), a lens-type focusing element and a set of directional antennas, which are used for the primary reception of noiselike ultrawideband radiation. An experimental device of the considered type is designed and the operability of the proposed technical solution is demonstrated.

In this paper, we present the measurement results of the dynamics of the level of electromagnetic microwave radiation obtained using "MERA" personal dosimeters developed at the Kotelnikov Institute of Radioengineering and Electronics, Russian Academy of Sciences. The measurements were performed under various conditions: in Russia and foreign countries, in megacities and resort areas, day and night, and in public transport and airplanes. The data obtained based on direct long-term measurements allows assessing the real electromagnetic microwave load exerted by modern means of mobile communications on the environment surrounding a person.

Application of dynamic chaos for the illumination of the surrounding space by artificial incoherent sources of microwave radiation with the purpose of its subsequent observation using special receiving equipment is considered. An incoherent broadband microwave radiation field is provided by "radio light lamps" based on dynamic chaos generators. The radio light is received with specially designed sensitive elements that combine the properties of an envelope detector in communication systems and a radiometer. It is shown that with the help of directional antennas connected to these sensitive elements, it is possible to create receivers with spatial resolution for visualizing a part of the surrounding space in artificial radio light. Radio light images of a room have been obtained. The possibility to detect changes associated with the emergence of new objects on these images is demonstrated.

A problem of an increase in the range of direct chaotic ultrawideband transceivers is considered. Parameters that determine the range are theoretically estimated. Experimental transceivers with a capacity of up to 12 Mbit/s and a range of greater than 200 m are developed and fabricated. The corresponding software is developed and tested. Experimental characteristics of the devices prove the theoretical estimations.

The use of ultra-wideband direct-chaotic communications and radio identification tags for the organization of wireless high-speed data transmissons on the Internet of things and the Internet of robotics is considered.

The experimental analysis of image acquisition in microwave band is carried out in the article. Several radiolight lamps based on ultrawideband chaotic generators are used as multiple lightning sources. Spatial images are obtained with a help of narrow radiation pattern antenna scanning the area of interest. Compact items characterized by different electromagnetic properties were used as observation objects. It is shown that proposed method of image acquisition allows one to detect objects lit by artificial radiolight sources.

The problem of illumination of objects and surfaces by artificial incoherent sources of microwave radiation (radio light lamps based on dynamic chaos generators) in order to observe them using special receiving equipment is considered. A scheme of a receiver is developed and an experimental model of such a receiver with a spatial resolution sufficient for the visualization of a part of the surrounding space in artificial radio light is implemented. Images of a room in radio light are obtained. The feasibility of detecting changes on these images, associated with the emergence of new objects, is shown.

The use of ultra-wideband direct-chaotic communications and radio identification tags for the organization of wireless high-speed data transmissons on the Internet of things and the Internet of robotics is considered.Prototypes and models of ultra-wideband transceivers of the 3.0 -5.0 GHz range are described and presented.It is noted that these transceivers and nodes based upon them are intended for usage in sensor and active networks with arbitrary topology.It removes some of the limitations inherent for a number of other solutions for communication and identification.