Increasing quality of the wireless module for monitoring and supervision of sound series of the expanded purpose

The sound series are considered as an addition to visual and thermal imaging information flows when using computerized monitoring systems (CS). A minimum complete structure of spaced microphones for collecting data on sound rows, which is suitable for calibrating, isolating and transmitting data on sound anomalies (SA), is proposed. Duplication of the data transmission channel by wire and Wi-Fi module for recording and determining the type and coordinates of the SA is provided. An experimental receiving module has been assembled, which includes microphones, amplifiers and signals matching boards for digital and analog forms, an ARDUINO UNO WIFI REV2 controller with an integrated Wi-Fi module. It is presented that its addition with a personal computer and a smartphone with the Android operating system forms a CS for remote wireless control of the course of the experimental analysis of sound series. It has been confirmed experimentally that its structure is minimally complete. An algorithm was developed and a software package was written in C/C++ languages. It is shown that the number of microphones is selected from the conditions of the problem from 1 to 5, but their number is limited to five digital inputs of the ARDUINO UNO WIFI REV2 board. A wave representation of the law of temporal changes in intensity and the integral norm of SA is applied. The possibilities of calibrating all data of sound series in analog and digital form are demonstrated. The article presents the suitability of testing the algorithms for determining the phases of echograms from time series data, containing SAs of different origins and recorded by three different microphones. The effect of connecting a Wi-Fi module on reducing the voltage drop by 0.5–1 V is shown. The necessity of an additional registration condition for all microphones is demonstrated. The software interfaces for the calibration of the receiving module and the operation of the mobile application have been developed.

Development of a fiber-optic microwave signal transmissionsystem for an X-band receiving module with dual frequencyconversion

The article discusses the use of double frequency conversion in the receiving module of the radar. To solve the resulting interference in the feeder paths, it is proposed to use a fiber- optic transmission system. The results of experimental investigations are presented.

METHOD OF STRUCTURAL SYNTHESIS OF RECEIVING AND TRANSMITTING RADIO DEVICES BLOCK SCHEMES

This paper is devoted to development of an algorithm for the synthesis of receiving and transmitting radio devices block schemes. Based on the presented algorithm, it is possible to develop a program that implements automated circuit synthesis. Such a program allows to a developer to obtain the most optimal scheme in the class of Pareto-optimal solutions. The algorithm is based on the method of exhaustive search of structural and elemental designs, and the decision-making method based on the criteria convolution method. The application of the exhaustive search of possible structural-element designs method allows creating a complete set of implementations and thus making choice decision of a scheme according to certain criteria among all possible constructions. This allows asserting the optimality of the obtained solutions, selected from a complete ensemble of possible designs. The use of the vector optimization method to select the optimal structural block scheme design of receiving and transmitting radio devices allows determining the most optimal construction according to the criterion for the highest value of the optimization function formed by the criteria convolution method. In the paper also considered a practical example of the synthesis of the input circuit of the receiving module RF part. As an example, the task of change the electronic components of the input part of the receiving module RF part with alternative microcircuits is given. To solve the described problem, a program was developed in the MATLAB. The results of the program are also given in the paper. The effectiveness of the developed algorithm and method for solving the task of synthesizing a block scheme from an elemental base represented by modern electronic components and circuit solutions is shown. Recommendations on further promising application of the proposed algorithm and method are presented.

DEVICE FOR BINARY DATA TRANSMITTING AND RECEIVING OVER A FIBEROPTIC COMMUNICATION CHANNEL

When transferring data over optical fiber communication channels, it is required to provide data security and the authenticity of their source. To limit the access to the data for a third party, there can be applied quantum-cryptographical systems which are supposed to transfer every data bit by means of low power optical signals containing radiation photons the number of which could be in the range from 10 to 1, however, are far from being perfect and suffer from shortcomings, the main of which being a large number of errors due to the depolarization effect of optical radiation. The aim of this work was, therefore, to create device for sending and receiving confidential data which could provide complete security of transferred data, inherent to quantum-cryptographical communication systems at the same time could have a low number of such errors.A device for quantum-cryptographic communication system with a photon counter applied as a receiving module has been proposed. The possibility to use silicon avalanche photodetectors operating in the photon counting mode for confidential information transmission systems and defining authenticity of the source of transmitted information has been shown.I develop modern optical fiber communication system incorporating avalanche photodetector photon counter as a receiving module, that allow to detect unauthorized access to information and violation of its integrity and speed up the exchange of information in comparison with well-known quantum-cryptographical communication systems.