Calculation and experimental methods definitions of the main characteristics of the spatial distributed casual antennas in a wide strip of frequencies are given. The specifics of casual antennas influencing their parameters in the modes of reception and radiation of electromagnetic waves are analyzed

Justification of simple analytical experimental model for calculation of characteristics of strengthening and dispersion of aperture antennas is given. Influence of standing wave ratio (SWR) in an antenna feeder and antenna's coefficient of strengthening on the effective surface of dispersion (ESD), and also interrelation of the specified characteristics are shown. The example of the horn antenna’s measuring of ESD definition by a settlement and experimental method on the basis of the offered definition of integrated antenna’s ESD technique is given

The justification for the block diagram of the installation of a remote control acoustic information based on high-sounding sources of acoustic signals. An algorithm for optimal nonlinear filtering of signals in the receiver, based on the use of improved correlation procedures for complex signals from the background noise are given

The technique to identify and quantify the risk of side channels of reception, training-conditionality intermodulation effects of second and third order. The procedure involves the steps of calculating the frequencies and levels of intermodulation products in the nonlinear path of the receiver and measurement of noise immunity of the receiver. Methodology oriented to application in practice test digital radio receivers for electromagnetic compatibility and noise immunity and reduce the complexity of different tests

Versions of construction of schemes for optimal processing of linear frequency-modulated (LFM) signals in nonlinear radiolocation stations (RLSs) in time and frequency domains are proposed. The capacities for increasing the signal/noise ratio during the processing are estimated, and versions of the scheme implementation are discussed.

The possibility of using steganography algorithms directly in code construc-struction communication systems. Presented the idea of a two-tier system with the protection of the steganographic data stream. The estimation of the parameters of the systems

Results of analysis of the modern state of the theory of optimal signal reception in radio systems in terms of the information theory of measurements are presented. The advantage of entropy information approaches to evaluation of the reception quality over traditional statistical reception optimization methods is demonstrated. An information indicator of radio signal reception quality, based on evaluations of entropy of the law on distribution of the signal information parameter is formulated.

An information entropy criterion of radio signal reception quality is substantiated. The advantages of the information entropy quality criterion over traditional statistical energy criteria are demonstrated. Recommendations for practical application of the proposed criterion in the theory of evaluation of radio reception quality are formulated.

Are considered from the point of view of features of practical realisation modern method of superbroadband radio communication. The new likelihood method of radio communication, different from a pulse method by simplicity technical realization is offered

Principles of operation of nonlinear radio communication and radio jamming facilities are described. Basic radar equations for nonlinear radio communication and radio jamming are obtained. Methodological recommendations on the application of radar equations for nonlinear radio communication and radio jamming used to evaluate efficiency of nonlinear radio communication facilities and their radioelectronic jamming devices are given.

A brief comparative analysis of the existing single-position methods used for determining the coordinates of radiating objects in the near-field region is made. The description of a new method for determining the position of the radio-frequency source, based on Doppler modulation of a spherical wave front of the received signal in the Doppler receiving channel with a rotary antenna, is provided. Errors of measurement of the range and angular coordinates of the radio-frequency facility are evaluated. Recommendations for practical application of the method in linear and nonlinear radio-position finding and radio-range finding are formulated.

Results of comparative analysis of the existing methods and facilities used for remote blocking of radio-telephones in the mobile radio communication systems are given; the method of blocking of radio-telephones, based on useful application of nonlinear intermodulation and blocking effects in the radio-telephone transmitter and receiver, is described; the field of possible practical application of the nonlinear method of radio-telephone blocking is determined.

For the purpose of a substantial increase of the range and resolution of nonlinear radars, we proposed a new technology for pulse transmission and reception, based on the use, for object probing, of a package of four (the simplest version) pairwise asymmetrically polar ultrashort ultrabroadband pulses followed by processing of received echo signals by the Immoreev algorithm.

Methods of active and passive nonlinear phase radio range finding of radio frequency sources are described; requirements to dimensions of antennas and antenna arrays for passive range finders are formulated; recommendations on the use of methods of nonlinear phase radio range finding in radio communication systems and facilities and radio frequency source location are given.

A new method of radio jamming of heterodyne receivers, based on creation of interference at an interim frequency and ensuring an effect, equivalent to the barrage jamming over the entire receiving range with preserved electromagnetic compatibility conditions is described, and its advantages are indicated.

A nonlinear phase radio-range station for measuring distances to radio emission sources (RESs) based on measuring the phase differences between the test modulating signal and the signal at the output of the detector of the receiver of the radio-range station is analyzed; it is shown that the relative error of the range determination is defined by the stability of the probing signal frequency and depends on the root-mean-square value of the phase measurement error; a comparative analysis of the pulsed and frequency methods of nonlinear radio range finding is presented.

Results of experimental investigations of products of the third-order intermodulation in transmitters are presented. Characteristic features of intermodulation interferences are identified; measures for eliminating adverse effects of such interferences in mobile communication networks are proposed.