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2020. Т. 20, No 2. С. 67–76 67 Introduction The operation of the direction finder as part of a radio-angle measuring system is usually accompanied by interfering influences caused by re-reflected signals. In this case, the direction-finding radio source and interfering reflectors may be in the Fresnel zone of the receiving antenna of the direction finder, that is, the condition 2 . , 2 / , i d z R R R L    where R, Ri – distance from the center of the opening of the receiving antenna to the radiation source and the i-th reflector, respectively; Rd.z – far zone receiving antenna;  – wavelength of the observed field; L – the length of the antenna. The results of the analysis of the accuracy characteristics of the monopulse method relate to the case when, within the opening of the receiving antenna, the wavefront of the signal of the direction-finding target can be considered almost flat [1–11, 13]. Known estimates of the mean square deviation (MSD) of errors in determining the angular position of the center of a small-sized radar target in the Fresnel zone of a receiving antenna, consisting of a large number of unresolvable “brilliant points” [12]. In this case, the estimation of the angular coordinates of the targets is formed to the maximum of the output effect of the spatial processing system, regardless of any particular algorithm. In this paper consider the problem of determining the measurement errors monopulse radio direction finder angular coordinates of a point radio source in the Fresnel zone of the receiving filled LAR under the combined influence of internal noise and angular noise generated by signals of statistically independent point reflectors. DOI: 10.14529/ctcr200207

Errors in Measuring the Angular Coordinate of Extended Targets by the Monopulse Method in the Fresnel Zone of the Linear Antenna Array