Abstract
The necessity of studying the influence of the transformation of the frequency mismatch function of a coherent bundle of radio pulses on the quality of solving the radar frequency resolution problem is substantiated. This solution determines the effectiveness of radar observation of high-speed and maneuvering individual and group aerodynamic objects. The method is based on explicit expressions for calculating the normalized frequency mismatch function of a coherent bundle of radio pulses, taking into account its transformation due to the radial motion of high-speed and maneuvering individual and group aerodynamic objects. The estimation of the potential frequency resolution of bundles with different numbers of radio pulses with typical parameters for a coherent pulse radar is carried out. Possible values of frequency resolution under the additive effect of uncorrelated internal noise of the radar receiver and the multiplicative effect of correlated phase fluctuations of the radar signal are estimated. With an insignificant multiplicative effect of correlated phase fluctuations, a twofold increase in the number of radio pulses in a bundle provides an improvement in the frequency resolution (reduction of the width of the normalized frequency mismatch function) by 100 %. With the predominant multiplicative effect of these fluctuations, a twofold increase in the number of radio pulses results in an improvement in the frequency resolution by about 40 %. The developed method is of great theoretical and practical importance for the further development of the radar theory of high-speed and maneuvering individual and group aerodynamic objects.
Highlights
One of the main requirements for modern radar systems is to ensure high-quality resolution of radar signals for independent radar observation of aerodynamic objects
This paper presents mathematical expressions for the frequency mismatch function of the main types of radar signals, in particular, a coherent bundle of radio pulses
The multiplicative effect of correlated phase fluctuations due to real observation conditions of coherent pulse radars of aerodynamic objects causes the expansion of the normalized frequency mismatch function and deterioration of the frequency resolution by up to hundreds and more times
Summary
One of the main requirements for modern radar systems is to ensure high-quality resolution of radar signals for independent radar observation of aerodynamic objects. Resolution of radar signals enables separate detection and measurement of informative parameters of signals reflected from aerodynamic objects with close coordinates and motion parameters. The task of radar detection is to decide on the presence or absence of the reflected signal in the adopted implementation. The object coordinates must be taken into account when deciding on detection. This procedure is «detection-measurement», and if there are several objects with similar parameters – «detection-measurement-resolution»
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