METHOD OF MEASURING DIRECTION-FINDING ERRORS OF A RADAR ANTENNA DOME SYSTEM Russian patent published in 2019 - IPC G01R29/10 

FIELD: radar ranging and radio navigation.

SUBSTANCE: invention relates to radar engineering. Method is based on measurement of the angular displacement of the spatial position of the minimum formed by the difference RP of the antenna at given angles of its rotation in azimuth and roll and determination of direction-finding errors depending on these angles. Before installation of fairing azimuth plane of scanning of antenna support-rotary device (ASRD) with roll installed on it at angle Ψ_j phased antenna array, is adjusted in such a way that the azimuthal plane of scanning of the antenna support-rotary device coincides with the horizontal plane, after which the phased antenna array beam is set according to the coordinates and , which is input to the PAA beam control unit and calculated at the selected bank angle Ψ_j, and arbitrary angle of deviation of beam from normal θ_oi from the entire possible range of the beam deviation for the particular PAA by formulas , which makes it possible, by azimuth scanning ASRD from central angle (-θ_oi), at the same time to measure horizontal cross-sections of both difference RPs, where their measured angular coordinates of minima coincide on all angles of deviation of the beam from the normal θ_oi, after which all measurements are repeated at other selected CAR angle angles, and after installation of fairing and corresponding measurements by the same as before its installation, roll angles and angles of deviation of beam from normal, according to changed angular coordinates of minima in cross-sections of difference RP of PAA-fairing system corresponding components of direction-finding error in coordinates α_x and α_y, applied by fairing at corners Ψ_j, θ_oi installation of the PAA-fairing system can be calculated using the formulas:

,

where: is component of direction-finding error introduced by fairing by angle αx when installing the PAA beam by coordinates θ=θ_oi; Ψ=Ψ_j, – component of direction-finding error introduced by fairing, by angle αy during PAA beam setting by coordinates θ=θ_oi, Ψ=Ψ_j, θ_oi – one of arbitrarily set current values of spatial angle between the direction of the PAA beam installation and the normal to its opening, on which, before the fairing installation, the measured minima of the horizontal sections of the difference diagrams coincide, Ψ_j – current preset value of the PAA bank angle relative to the horizontal plane of the azimuth scanning of the antenna support-rotary device, θ_ai – measured, after installation of fairing, actual angle of minimum horizontal cross-section of difference azimuth diagram during installation of PAA beam by coordinates θ=θ_oi; Ψ=Ψ_j, θ_yi – measured, after installation of fairing, actual angle of minimum horizontal cross-section of difference elevation diagram during installation of PAA beam by coordinates θ=θ_oi; Ψ=Ψ_j.

EFFECT: disclosed is a method of measuring direction-finding errors of a radar antenna dome system.

1 cl, 4 dwg