Influence of accuracy estimation of frequency characteristics of radar targets on the results of identifying the geometric shape of local reflectors

Abstract

The issues of introducing broadband technologies in civil and special purpose radar systems are considered. The popularity of these technologies for solving a number of practical problems determines the relevance of research related to a detailed analysis of long-range portraits of observed objects at a new qualitative level. 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 the observation object using the results of broadband radar sounding is studied. The created broadband radar measuring channel with linear frequency modulation of the signal based on the method of generalized heterodyning is described. A technique is proposed for compensating systematic measurement errors for a channel of a given type using calibration spheres. The systematic error in measuring the frequency characteristics of the sphere is estimated, and an error indicator for estimating the frequency characteristics of objects is proposed. The dependence of the statistical indicators of the identification results of the geometric shape of local reflectors on the specified indicator is given. The possibility of identifying the geometric shape of local reflectors of objects by the parameters of their frequency characteristics has been experimentally confirmed. The results can be used to assess the reliability of identifying the geometric shape of local reflectors at the stage of calibration of the measuring channel, as well as to decide on the feasibility of implementing algorithms for identifying the geometric shape of local reflectors on an existing radar.