Influence of the Estimation Accuracy of the Frequency Characteristics of Radar Targets on the Results of the Geometric S
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RADIO MEASUREMENTS INFLUENCE OF THE ESTIMATION ACCURACY OF THE FREQUENCY CHARACTERISTICS OF RADAR TARGETS ON THE RESULTS OF THE GEOMETRIC SHAPE IDENTIFICATION OF LOCAL REFLECTORS V. V. Neelov and S. E. Shaldaev
UDC 621.391.2
This article discusses the issues of introducing broadband technologies to civil and special-purpose radar systems. The popularity of these technologies in terms of solving numerous practical problems determines the relevance of research related to a detailed analysis of long-range portraits of objects observed at a new qualitative level. Using the results of broadband radar sounding, this study analyzes the influence of the systematic error of the measuring channel on the reliability of the identification of the geometric shape of the local reflectors of observation objects. A broadband radar-measuring channel with a linear frequency modulation of the signal is created on the basis of the generalized heterodyning method. Then, a technique for compensating systematic measurement errors for a given type of channel is proposed using calibration spheres. The systematic error in measuring the frequency characteristics (FCs) of the sphere is estimated, and an error indicator for estimating the FCs of objects is proposed. Furthermore, the dependence of the statistical indicators of the identification results of the geometric shape of local reflectors on the specified indicator is presented. The possibility of identifying the geometric shape of local reflectors through the parameters of their FCs is confirmed experimentally. The results obtained can be used to assess the reliability of the identification of the geometric shape of local reflectors at the calibration stage of the measuring channel and to make a decision on the feasibility of implementing algorithms for the identification of the geometric shape of local reflectors on an existing radiolocation station. Keywords: frequency characteristics, identification of the geometric shape of a radar target, measurement channel calibration, broadband measurements.
Introduction. The method of measuring target scattering characteristics using linear frequency modulated (LFM) signals is known [1–3] and has been implemented repeatedly in foreign radiovision radiolocation stations for various purposes [4–7]. A distinctive aspect of this method is the possibility of high range resolution, which enables the observation of objects as distributed targets and the use of information obtained to solve several applied problems. One of such applied problems includes the identification of the geometric shape of local target reflectors using a model based on geometric theory of diffraction [8]. This model enables the identification of double- and single-curvature surfaces, as well as planes and edges. The reliability of identification is determined by the error in estimating the frequency characteristics (FCs) of the target. The error in the target FC estimation determines the feasibility of implementing algorithms for the identification of the geometric shape of l
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