The problem of approximation of nonlinear characteristic of weak signal detection in the form of polynomial function connected with integral distribution law is considered. The variance of this approximation does not depend on the kind and the parameters of the input non-Gaussian distribution. The article provides benchmarking of applying of polynomial function in case of sinusoidal noise when the noise is the sum of harmonic vibrancy and Gaussian noise. The noises with different spectral characteristics are analyzed. With radiofrequency noise spectrum the efficiency of the applied transformer may grow to considerably high values at the current stabilizing characteristics.

Synthesis methodology of the non-recursive and recursive complex discrete filters is examined on the base of the methods of the invariant impulse and transition characteristics, and on the base of z-transformation method. It is shown that complex filters contain two quadrature channels allowing easily to change the filter tuning frequency. This makes them very effective when adaptive and coherent systems for information processing are created. Specific examples of complex discrete filter arrangement are provided.

The article is intended for specialists in the field of electronic warfare and adaptive jammer cancellation. The main advantage of the proposed spatial adaptive broadband compensator is the ability to adaptively estimate the number of active interference for minimizing computational complexity in compare with traditional methods for suppressing wideband interference. The paper presents a strong theoretical derivation of the weight matrix of the auto-compensator. The main approach for calculating the weight matrix is the expansion in powers of vectors in the orthonormal basis. A practical approach for introducing the algorithm into software is proposed.

The paper is aimed at the study of time-based searching procedure for satellite altimeter echo-signal. The specific character of the problem is the noise nature of received signal which is a superposition of multiple illuminated scatters reflection. The searcher is made as a bank of parallel energy receivers. When search characteristics are calculated, the received power profile is exponentially approximated. Normalized threshold, search failure probability and search duration are quantified. Theoretical results are well corroborated with MATLAB simulation.

The subject of research is a space-based radar altimeter. Modern satellite altimeters along with the instant distance to an earth surface are to measure the sea wave height and scattering cross section per unit of a probed spot. Ranking of specific measuring algorithms for the quantities mentioned is carried out by comparison of their accuracy indicators with the reference which is minimum theoretical estimate variance established by the Cramer-Rao bound. Calculation of such bounds in case of joint estimate comes down to inversion of the Fisher information matrix. In the paper, this task is solved within the framework of Gaussian approximation of both compressed ranging pulse and antenna pattern. As a result, expressions for noise variances of joint estimates of satellite height, significant wave height and power SNR are obtained. Quantifying the received equations into figures is implemented by numerical integration.

The article describes designing of a simple active filter circuit for an amplitude RC equalizer on three operational amplifiers with reconfigurability of all three main parameters: resonance frequency transfer coefficient and Q. Reconfigurability of these parameters is carried out by two variable resistors and one potentiometer. To adjust the resonance frequency, a dual potentiometer is not required. The quality factor and the transmission coefficient are adjusted within one decade. The tuning of the resonance frequency is possible within one octave without a significant effect on the Q-value. The obtained scheme of a simple tunable amplitude corrector is suitable for working in the range of low frequencies to video frequencies.

Metal gratings (MGs) with rectangular lamels based on the technology of jet etching of thin metal plates are widely used in different polarization devices of microwave and terahertz engineering. Numerical methods of mathematical modeling or direct measurements are employed for their analysis. Sometimes in case of H-polarization, analytical approaches for evaluation of transmission characteristics of such gratings can be taken. However, the accuracy of the most of proposed similar models depends essentially upon sizes and frequency ranges. The present article provides both theoretical and experimental research of transmission characteristics of MG with fixed size illuminated by plane electromagnetic wave with H-polarization. Two analytical models are utilized for preliminary evaluation of MG parameters. One of them determines the top limit of T(f) variations, where T is transmittance and f is frequency. The other model determines the bottom limit. The given models were implemented in assumption of small reflections in microwave network. MG size defines one of the restrictions on their application.

The article considers statistical descriptions of time interval estimation for air target motion trajectory au-tomatic detection in radar information secondary processing. Analytical expressions for confidential proba-bilities of the air target motion trajectory automatic detection are obtained. It is supposed that the target loca-tion mark appearance is invariable within the whole observation time. The confidential probability dependences are analyzed from the signal noise ratio for the received signals with random amplitudes and elementary phases. It is shown that the target motion trajectory determination probability increases with the increase of signal noise ratio and decrease of radar observation period number.

Soft magnetic thin CoP films were obtained by means of chemical metallization from aqueous cobalt salt solution in the presence of sodium hydroxide, citric acid and sodium hypophosphite as the reducing agent. The optimal values of the magnetic film parameters (saturation magnetization and width of ferromagnetic resonance line) were obtained by variation of composition of work solutions. It allows to reduce losses in their application in microwave devices. Microphotographs of magnetic film indicate a grain structure with a grain size of about 50 nm and presence of inclusions with the size of 3-5 nm. To determine the magnetic parameters of the investigated films the method of ferromagnetic resonance (FMR) absorption curves processing is used. The values of FMR line width and an effective magnetization of film material saturation were obtained.