Regulating method of secondary surface of modified Cassegrain type antenna

Abstract

The invention discloses a regulating method of the secondary surface of a modified Cassegrain type antenna, mainly solving the problem that the traditional method carries out approximate regulation only along an axial direction or a radial direction. The regulating method comprises the following steps of: carrying out segmented parabola fitting on generatrix discrete points of the primary surfaceof the modified Cassegrain type antenna to obtain a group of segmented standard parabolas; rotating the fitted parabola around a common axis for a round to obtain a group of parabolic tori; establishing an optimized mathematical model to calculate segmented fit parameters by taking that a root-mean-square value of the z direction deviation of nodes of the primary surface relative to the parabolictori is minimum as a target and ensuring that the parabolic tori meet a confocal axis and the length of a focal line is not longer than that of an initial focal line; and calculating the regulating amount of two endpoints of the focal line according to focal length variation amount and vertex coordinates which are included in the fit parameters to direct the regulation of the secondary surface ofthe modified Cassegrain type antenna. The invention has the advantages of accurately positioning the secondary surface under multiple working conditions and enhancing the electrical property of the modified Cassegrain type antenna and can be used for regulating the secondary surface of the modified Cassegrain type antenna, thereby enhancing the electrical property of the modified Cassegrain type antenna.

Description

technical field [0001] The invention belongs to the technical field of antennas, and relates to antenna adjustment, in particular to a method for adjusting the secondary surface of a modified Cassegrain antenna, which is used to guide the secondary surface adjustment of a card-type double-reflector antenna to reduce the main surface The effect of deformation on the electrical performance of the antenna. Background technique [0002] The modified Cassegrain antenna has been widely used in radar tracking, satellite communication, deep space exploration and other fields due to its advantages of high irradiation efficiency and low edge leakage. The main surface and the secondary surface of this type of dual-reflector antenna are modified curved surfaces. The purpose of this is to make the amplitude and phase of the aperture field of the main reflector uniformly distributed, so as to improve the electrical efficiency of the antenna. The accuracy of the main surface of the dual-r...

AI Technical Summary

Problems solved by technology

[0008] For the adjustment of the sub-surface of the modified Cassegrain antenna, the existing methods are only approximate adjustments along the axial direction or radial direction. In fact, the sub-surface of the antenna not only has radial and axial translation at different elevation angles, but also There is a rotation around the coordinate axis, and the phase error caused by such secondary surface rotation will seriously affect the electrical performance of the antenna

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