Journal of Siberian Federal University: Engineering & Technologies最新文献

{"title":"Requirements Justification to Digital Signal Synthesizers for Various Types of Radar Systems","authors":"D. S. Viktorov, E. V. Plastinina, E. V. Samovolina","doi":"10.17516/1999-494x-0268","DOIUrl":"https://doi.org/10.17516/1999-494x-0268","url":null,"abstract":"The paper justifies the requirements for the level of distortion of radar stations with pulse and quasi-continuous radiation, built on the basis of digital signal synthesizers of four types: digital synthesizers of voltage counts and digital synthesizers of phase counts with uniform sampling, digital synthesizers of voltage counts and digital synthesizers of phase counts with uneven sampling. When building a radar master device, the question arises about choosing the type of digital signal synthesizer. The main initial criteria are the maximum operating range of the digital synthesizer and the level of in-band distortion. When choosing the type of digital signal synthesizer, you have to take into account a large number of factors, the main of which are the complexity of the execution of the digital readout shaper, the possibility of implementing a digital readout shaper with the required speed and number of digits [1, 2]. When making requirements for the total level of distortion, the criterion of acceptable reduction of the probability of correct detection in comparison with its potential value for a fixed probability of false alarm is used. Based on this criterion, in pulse radars, the maximum relative RMS value of the distortion of the intercorrelation function of a signal with angular modulation generated by a digital synthesizer should not exceed Dδx ≤ –(51...67) dB. In a radar with quasi-continuous radiation, the maximum relative mean-square value of the distortion of the autocorrelation function of the signal with angular modulation should not exceed Dδ ≤ –(80...120) dB. The number of bits of phase quantization, voltage and time delay compensation in digital signal synthesizers depends not only on the maximum relative RMS value of the distortion of the intercorrelation function, but also on the number of samples of the signal with angular modulation. Therefore, initially you need to select the reference frequency of the digital signal synthesizer, setting the type of modulation and the effective spectrum width of the signal with angular modulation based on the tactical and technical characteristics radar","PeriodicalId":17206,"journal":{"name":"Journal of Siberian Federal University: Engineering & Technologies","volume":"183 2 1","pages":"818-828"},"PeriodicalIF":0.0,"publicationDate":"2020-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72875950","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"On the Choice of Base Geometry, Type and Design of the Passive Radio Reflector of the Passive Radar Complex","authors":"Vitaly V. Loy, E. N. Garin, A. N. Fomin, Nikita V. Kopilov","doi":"10.17516/1999-494x-0277","DOIUrl":"https://doi.org/10.17516/1999-494x-0277","url":null,"abstract":"The article presents the methods that allow to solve the problem of choosing the type, design and installation location of a control terrain feature (CTF) – a passive radio reflector for a passive location complex that implements the angle measuring-range-difference method. The CTF module must reflect the signal at angles from 0° to 180° (upper hemisphere). The rationale for choosing the CTF module and base geometry will allow receiving signals from jammers from any direction relative to the main receiving point","PeriodicalId":17206,"journal":{"name":"Journal of Siberian Federal University: Engineering & Technologies","volume":"83 1","pages":"907-918"},"PeriodicalIF":0.0,"publicationDate":"2020-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83992077","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Immunity of the Data Transmission Channel with FHSS when Soft Decoding by Means of Spectral Density Estimation of Interference Power","authors":"Valery P. Berdychev, A. A. Bliznyuk, S. B. Zhironkin, A. A. Pshenitsyn, A. A. Kuchin","doi":"10.17516/1999-494x-0270","DOIUrl":"https://doi.org/10.17516/1999-494x-0270","url":null,"abstract":"The characteristics of noise immunity of a coherent data transmission channel with Frequency Hopping Spread Spectrum (FHSS), orthogonal signals and Reed-Solomon code with its soft decoding have been obtained using spectral density estimation of interference power, which is a combination of two Gaussian noise interference, they are barrage jamming and one concentrated in the FHSS band part. It is found that when the volume of an orthogonal signals ensemble increases, noise immunity rises due to the accuracy growth of the spectral density estimation of the interference power, which in turn provides an accuracy growth of posterior probability estimation used for soft-decision decoding","PeriodicalId":17206,"journal":{"name":"Journal of Siberian Federal University: Engineering & Technologies","volume":"11 1","pages":"843-854"},"PeriodicalIF":0.0,"publicationDate":"2020-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84172166","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Increased Noise Immunity Method of a Pulse-Doppler Airborne Radar Station under the Influence of DRFM Signal-Like Interference","authors":"A. Bogdanov, D. V. Zakomoldin, Sergey A. Chasovskikh","doi":"10.17516/1999-494x-0267","DOIUrl":"https://doi.org/10.17516/1999-494x-0267","url":null,"abstract":"In this article an increased noise immunity method of a pulse-doppler airborne radar station under the influence of a DRFM signal-like interference when exposed on the side lobes of antenna directivity chat has been developed, a device for its implementation has been presented, and characteristics of the device based on the modeling have been evaluated","PeriodicalId":17206,"journal":{"name":"Journal of Siberian Federal University: Engineering & Technologies","volume":"8 1","pages":"803-817"},"PeriodicalIF":0.0,"publicationDate":"2020-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82508820","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Model for Calculating the Thermophysical Characteristics of Materials According to Multispectral Multi-Temporal Photographic Survey of the Earth’s Surface","authors":"I. Ischuk, A. Dolgov, Maxim A. Likhachev, Bogdan K. Telnykh","doi":"10.17516/1999-494x-0278","DOIUrl":"https://doi.org/10.17516/1999-494x-0278","url":null,"abstract":"The article presents a model for calculating the thermophysical parameters of materials according to multispectral multi-temporal photographic survey of the Earth’s surface. The analysis of using data on the thermophysical parameters of materials for the identification of monitoring objects is carried out. The numerical estimates of the errors in determining the thermophysical parameters of the tested materials and distribution histograms of the thermophysical parameters of materials according to the field experimental data are also obtained","PeriodicalId":17206,"journal":{"name":"Journal of Siberian Federal University: Engineering & Technologies","volume":"89 1","pages":"894-906"},"PeriodicalIF":0.0,"publicationDate":"2020-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83879345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Guidance Algorithm of Air-to-Air Guided Missile with an Active Radar Target-Seeking Head to a Helicopter with Various Modes of its Flight","authors":"A. Bogdanov, S. Gorbunov, A. A. Kuchin, Ali A. Hadur","doi":"10.17516/1999-494x-0269","DOIUrl":"https://doi.org/10.17516/1999-494x-0269","url":null,"abstract":"On the basis of the mathematical apparatus of the statistical theory of optimal control, the method and algorithm of guidance of an air-to-air guided missile with an active radar target-seeking head when aiming at a «helicopter» class air target with various modes of its flight, including when hovering have been developed. The synthesis has been carried out as a result of flight experimental studies of radar signals reflected from a real helicopter. Also, recommendations for ensuring continuous tracking of a helicopter in an active radar target-seeking head have been presented","PeriodicalId":17206,"journal":{"name":"Journal of Siberian Federal University: Engineering & Technologies","volume":"22 3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88555257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Methods for Evaluating the Effectiveness of Aerosol Ormations in Protecting Objects against Aimed Fire from a Grenade Launcher","authors":"Yuriy L. Koziratsky, D. Prokhorov","doi":"10.17516/1999-494x-0274","DOIUrl":"https://doi.org/10.17516/1999-494x-0274","url":null,"abstract":"With the use of graph theory, probability theory and Laplace transform methods, the methods have been developed for evaluating the effectiveness of aerosol formations to protect objects against aimed fire from a grenade launcher. The methods enable to obtain probabilistic indicators of shells hitting the target when firing from a grenade launcher in difficult conditions, taking into account the time characteristics of the firing process and a set of aiming errors caused by a number of factors, including the use of aerosol screen","PeriodicalId":17206,"journal":{"name":"Journal of Siberian Federal University: Engineering & Technologies","volume":"8 1","pages":"882-893"},"PeriodicalIF":0.0,"publicationDate":"2020-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75478145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of the Effectiveness of Destructive Effects on Laser Guidance Systems of High-Precision Weapons","authors":"A. Dontsov, V. V. Kalachev, Yuriy L. Koziratsky, E. A. Levshin","doi":"10.17516/1999-494x-0271","DOIUrl":"https://doi.org/10.17516/1999-494x-0271","url":null,"abstract":"The article presents the results of theoretical and experimental studies of destructive effects on the main channels of various types of semi-active laser homing heads of high-precision ammunition. Recommendations concerning characteristics of promising intended interference were confirmed experimentally. They make it possible to determine new methods of influence on laser guidance systems for high-precision ammunition and to expand the capabilities of electronic warfare devices when protecting stationary objects","PeriodicalId":17206,"journal":{"name":"Journal of Siberian Federal University: Engineering & Technologies","volume":"70 1","pages":"855-870"},"PeriodicalIF":0.0,"publicationDate":"2020-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76190022","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Application of GIS Technologies to Improve the Efficiency of HPP Cascades Simulation Model","authors":"A. Arestova, S. Mitrofanov, A. Rusina, A. Kolesnikov","doi":"10.17516/1999-494x-0262","DOIUrl":"https://doi.org/10.17516/1999-494x-0262","url":null,"abstract":"The paper presents the calculation algorithm for water-energy regime of a hydroelectric power stations cascade. The block diagram of the algorithm is given for implementing the simulation model and automating the process of regime calculating. The proposed algorithm allows to evaluate the efficiency of the cascade operation, as well as to optimize the regime according to various criteria. Additionally, an option is proposed to integrate GIS monitoring data into the calculation algorithm. The sources and characteristics of Earth remote sensing data that can be used to build the model are presented","PeriodicalId":17206,"journal":{"name":"Journal of Siberian Federal University: Engineering & Technologies","volume":"26 1","pages":"732-744"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87242249","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thermal Efficiency of a Solar Air-Heating Collector with a Metal Chip Absorber","authors":"M. Uzbekov, Azamat G. Tukhtasinov","doi":"10.17516/1999-494x-0260","DOIUrl":"https://doi.org/10.17516/1999-494x-0260","url":null,"abstract":"It is known that one of the main issues of heat transfer in complex designs of solar air-heating collectors is the problem of determining the coefficient of convective heat transfer in some parts of absorbers. The article studies the processes of heat transfer occurring in a solar air-heating collector with an absorber, which is a system of metal flow chips and a V-shaped surface. A description of the design of a solar air-heating collector with a metal chip absorber is given. The absorber allows us to increase the contact surface between the coolant and the absorber. The experimental procedure and the results are presented. The experiments have shown that within the range of 850 – 950 W / m2 of direct incident solar radiation density, the average heating of coolant is 17.5 °C; within the range of 650 – 750 W / m2, it is 14.1 °C; within the range of 450 – 550 W / m2, it measures 10.1 °C. The maximum coolant heating is 27 °C which is equal to the output collector temperature 60 °C. The average heating of the coolant is 14 °C, which corresponds to the average output temperature of 45 °C. According to the data obtained in the experiment, empirical formulas are concluded. They are presented in the form of the dependence Nu = f (Re), it is aimed at determining the heat transfer coefficient of flow metal chips and V-shaped absorbers of a solar air-heating collector. The dependence of the absorbers heat transfer from metal flow chips and the V-shaped surface of the solar air-heating collector on the Re numbers within the range of 103÷104 is shown. A formula is derived that allows us to compare the effectiveness of absorbers of various types with a flat absorber of a solar air-heating collector.","PeriodicalId":17206,"journal":{"name":"Journal of Siberian Federal University: Engineering & Technologies","volume":"46 1","pages":"712-720"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88198306","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}