Кафедра "Комп'ютерна інженерія та програмування"

Постійне посилання колекціїhttps://repository.kpi.kharkov.ua/handle/KhPI-Press/1095

Офіційний сайт кафедри https://web.kpi.kharkov.ua/cep

Від 26 листопада 2021 року кафедра має назву – "Комп’ютерна інженерія та програмування"; попередні назви – “Обчислювальна техніка та програмування”, “Електронні обчислювальні машини”, первісна назва – кафедра “Математичні та лічильно-вирішальні прилади та пристрої”.

Кафедра “Математичні та лічильно-вирішальні прилади та пристрої” заснована 1 вересня 1961 року. Організатором та її першим завідувачем був професор Віктор Георгійович Васильєв.

Кафедра входить до складу Навчально-наукового інституту комп'ютерних наук та інформаційних технологій Національного технічного університету "Харківський політехнічний інститут". Перший випуск – 24 інженери, підготовлених кафедрою, відбувся в 1964 році. З тих пір кафедрою підготовлено понад 4 тисячі фахівців, зокрема близько 500 для 50 країн світу.

У складі науково-педагогічного колективу кафедри працюють: 11 докторів технічних наук, 21 кандидат технічних наук, 1 – економічних, 1 – фізико-математичних, 1 – педагогічних, 1 доктор філософії; 9 співробітників мають звання професора, 14 – доцента, 2 – старшого наукового співробітника.

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2019 - 20203

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Автор: search.filters.author.Karlov, VladimirМістить файли: Так

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  • Ескіз
    Документ
    The influence of statistical characteristics of the fluctuations of the radiation signal initial phases on the accuracy of the measurement aerodynamic object radial velocity
    (Національний технічний університет "Харківський політехнічний інститут", 2020) Kuznietsov, Oleksandr; Karlov, Vladimir; Kolomiitsev, Oleksii; Sadovyi, Kostiantyn; Biesova, Oksana
    The article deals with the estimation of radial velocity when using a coherent packet of radio pulses regarding the case of the presence of correlated fluctuations of the initial phases in the reflected from the aerodynamic object pulses. The subject of the research is the accuracy of measuring the frequency of the received packet for the case of concerted processing without taking into account the phase fluctuations of its radio pulses. The purposeis a numerical analysis of the influence of the statistical characteristics of the fluctuations of the received pack’s initial phases on the decrease in the accuracy of measuring the radial velocity of the aerodynamic object. The task: to estimate the possible values of fluctuation constituent middling quadratic error of measuring of radial speed of aerodynamic object. Consideration is given to the assumption that an additive mixture of deflected signal and uncorrelated Gaussian noise is input to the radar receiver. It is considered that the phase fluctuations of the received packet are distributed according tothe normal law with zero mean, and the correlation of phase fluctuations with the increase of the interval between the packet radio pulses decreases according to the alternating law. Methods used: methods of probability theory and mathematical statistics. The following results are obtained: the accuracy of frequency measurement of the pack had been estimated in the presence of correlated phase fluctuations of its radio pulses. Conclusions. The results indicate that for modernradars in the conditions of regular measurement the accuracy of estimating the frequency of the packet of radio pulses is much more influenced by the statistical characteristics of the phase fluctuation than the signal-to-noise ratio. Due to the phase fluctuations of the radio pulses of the received packet, the mean-square error (MSE) of radial velocity measurement of the aerodynamic objectis able to exceed the values determined by the requirements for coherent pulse radar.
  • Ескіз
    Документ
    Signal relay time measurer reflected from a small purpose at its location over the sea
    (Національний технічний університет "Харківський політехнічний інститут", 2020) Biesova, Oksana; Karlov, Vladimir; Lukashuk, Olena; Petrushenko, Valentin
    In the article possibility of account of phase fluctuations of signals reflected is examined from littlepitch aims location, during optimization of process of measuring of time of delay of signal. The process of optimization of measuring of distance to the aim on conditions of superrefraction is examined in supposition, that fluctuations of the signals reflected from aims up-diffused on a normal law, and the cross-correlation function of these fluctuations has an arbitrary kind. Within the limits of suppositions got correlation for the optimal estimation of time of delay of the reflected signals. Using the obtained ratios to determine the delay time and the variance of the group delay estimation, the target distance meter was synthesized under the radar of the target above the sea beyond the line of sight for the case when the correlation function of phase fluctuations is described by an exponential function. The proposed optimal estimation algorithm and rangefinder can be used to construct promising radar locations for low altitude targets. The use of such a meter can improve the accuracy of measuring the target range from 2 to 2,5 times.
  • Ескіз
    Документ
    Evaluation of the possibilities of providing the necessary accuracy of the radial velocity measuring of a target by coherent-pulse radars outside the line of sight
    (Національний технічний університет "Харківський політехнічний інститут", 2019) Kuznietsov, Oleksandr; Karlov, Vladimir; Petrushenko, Valentin; Biesova, Oksana; Lukashuk, Olena
    The purpose of the article.The article estimates the possible values of the components of the mean-square error of measuring the radial velocity of the target which appear as a result of fluctuations of thephase of the radio signal outside the radar line of sight. The expediency of using a coherent burst of radio pulses to providethe necessary detection range with specified quality indicators is substantiated. Consideration is carried out for a model of a signal with a random amplitude and an initial phase. It is assumed that phase fluctuations are distributed according to the normal law with zero mean, and their correlation decreases with an increase in the interval between the radio bursts of the packet alternating. Results. The results show that due to the phase fluctuations of the radio pulses of the received pack, the mean-square measuring error of the target radial velocity can exceed the values determined by the tactical requirements for coherent-pulse radars. Conclusions.The performed numerical analysis allows to determine the degree of reductionof the quality of the radio pulses burst time-frequency processing in coherent-pulse radars and evaluates the degree of reduction of the effectiveness of the further secondary processing of the radar information.