Abstract
The necessity of estimating the decrease in the accuracy of measuring the informative parameters of a radar signal in real conditions of its propagation and reflection has been substantiated. The results of the estimation determine the requirements for optimizing this measurement to achieve the required efficiency. A numerical analysis of the decrease in the accuracy of measuring the Doppler frequency of a coherent packet is presented, depending on the statistical characteristics of fluctuations of the initial phases of its radio pulses. Expressions are given for calculating the fluctuation component of the measurement error of radio pulse packet frequency for various coefficients of interpulse correlation of phase fluctuations. An assessment is made of the possibility of increasing the accuracy of Doppler frequency measurement, which can be ensured by statistical optimization of the algorithm for time-frequency processing of a given radar signal by taking into account its phase fluctuations. The conditions for the multiplicative influence of phase fluctuations of radio pulses of the received packet are substantiated, which determine the efficiency of optimization of Doppler frequency measurement. Based on the results of the study, an optimization method for measuring the Doppler frequency of the packet taking into account fluctuations in the initial phases of its radio pulses is proposed. The accuracy of Doppler frequency measurement under the influence of both the internal noise of the radar receiver and the correlated phase fluctuations of its radio pulses is estimated. The efficiency of optimization of measuring the Doppler frequency of the packet is estimated taking into account fluctuations of the initial phases of its radio pulses by means of computer simulation. It is proved that, under the influence of phase fluctuations, the accuracy of Doppler frequency measurement can be increased due to the performed optimization from 1.86 to 6.29 times. This opens the way to improving the existing algorithms for measuring the higher time range derivatives to improve the quality of tracking complex maneuvering aerodynamic objects. This explains the importance and usefulness of the work for the radar theory.
Highlights
Ensuring high accuracy in measuring the coordinates and motion parameters of radar surveillance objects is an urgent task for modern radars [1,2,3]
Finding the likelihood ratio (11) averaged by the fluctuation components of the packet radio pulse phases allows us to proceed to estimating the error variance of the optimal measurement of the Doppler frequency of the received packet taking into account the phase fluctuations of its radio pulses
2/9 ( 110 ) 2021 error over the variance of the noise component of this error reaches hundreds of times, which determines the conditions for taking into account phase fluctuations in algorithms for coherent processing of a given radar signal
Summary
PhD, Associate Professor** Sergey Herasimov Doctor of Technical Sciences, Professor Department of Combat Use of Weapons of Air Defense of the Ground Forces*** Stanislav Horielyshev. Oleksii Kolomiitsev Doctor of Technical Sciences, Senior Researcher Department of Computer Engineering and Programming National Technical University «Kharkiv Polytechnic Institute». Kyrpychova str., 2, Kharkiv, Ukraine, 61002 Olena Lukashuk PhD** Oleksandr Milov. Doctor of Technical Sciences, Professor* Vitaliy Panchenko PhD, Associate Professor. National Academy of National Guard of Ukraine Zakhysnykiv Ukrainy sq., 3, Kharkіv, Ukraine, 61001 *Department of Cyber Security and Information Technology Simon Kuznets Kharkiv National University of Economics. Nauky ave., 9-А, Kharkiv, Ukraine, 61166 **Department of Physics and Radioelectronics*** ***Ivan Kozhedub Kharkiv National Air Force University. How to Cite: Yevseiev, S., Kuznietsov, O., Herasimov, S., Horielyshev, S., Karlov, A., Kovalov, I., Kolomiitsev, O., Lukashuk, O., Milov, O., Panchenko, V.
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