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Accurate calculation method for primary surface accuracy and primary and secondary surface adjustment of shaped Cassegrain antenna

A card-type antenna and calculation method technology, applied in calculation, special data processing applications, instruments, etc., can solve problems such as inaccurate results and mismatching of microwave-optical relations

Active Publication Date: 2013-08-21
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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  • Abstract
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Problems solved by technology

Although this method uses a segmented parabola to represent the bus line of the main reflector of the shaped card antenna more accurately than method 1, the microwave optical relationship between the fitted parabolic annulus and the secondary reflector does not match, because the fitting Each segment of the standard parabola has only one focal point and the corresponding bus line of the main reflector corresponds to a focal area, so that the electromagnetic wave cannot be focused to a focal point after being reflected by the fitted parabolic torus and then reflected by the shaped secondary reflector. Focus, so this method is a method to approximate the accuracy of the main surface of the shaped card antenna, and the result is inaccurate

Method used

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  • Accurate calculation method for primary surface accuracy and primary and secondary surface adjustment of shaped Cassegrain antenna
  • Accurate calculation method for primary surface accuracy and primary and secondary surface adjustment of shaped Cassegrain antenna
  • Accurate calculation method for primary surface accuracy and primary and secondary surface adjustment of shaped Cassegrain antenna

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Embodiment Construction

[0044] An accurate calculation method for the accuracy of the main surface of a shaped card-type antenna and the adjustment of the main and secondary surfaces, which is characterized in that it includes the steps:

[0045] (1) Assume that the theoretical design of the shaped card antenna coordinates the main and secondary reflectors as xoyz; translate the coordinate system xoyz along the x-axis, y-axis, and z-axis respectively, and then circle around x 1 axis, y 2 axis, z 3 Rotate in the axial direction to obtain the coordinate system x that describes the moved sub-surface and the best fitting reflection surface corresponding to the moved sub-surface 4 o 4 the y 4 z 4 . said x 1 Axis refers to the coordinate system x formed after the coordinate system xoyz is translated along the x-axis, y-axis, and z-axis respectively. 1 o 1 the y 1 z 1 the horizontal axis; y 2 Axes refer to the coordinate system x 1 o 1 the y 1 z 1 around x 1 Coordinate system x formed after ...

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Abstract

The invention relates to an accurate calculation method for primary surface accuracy and primary and secondary surface adjustment of a shaped Cassegrain antenna, and belongs to the technical field of antennas. The accurate calculation method can be used for accurately calculating the primary surface accuracy of the shaped Cassegrain antenna, can accurately guide adjustment of secondary surface positions and gestures and active adjustment of a primary reflecting surface panel and is particularly applicable to the field of the antennas of large radio telescopes. The idea of the accurate calculation method includes that under the condition of aplanatism, an optimal identical reflecting surface is calculated through respectively adoption of translation along directions of an x-axis, a y-axis and a z-axis, rotation around an x1-axis and a y2-axis, and least square fit of six degrees of freedom of optical distance variation, so that the primary surface accuracy of the shaped Cassegrain antenna can be calculated. Meanwhile, calculated results of the accurate calculation method can guide the adjustment of the secondary surface positions and gestures and the active adjustment of the primary reflecting surface panel, so that influences of primary reflecting surface deformation on antenna performance can be reduced, and antenna efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of antennas, and relates to an accurate calculation method for the accuracy of the main surface of a shaped card antenna and the adjustment of the main and secondary surfaces. The invention is applicable to the calculation of the accuracy of the main surface of the shaped card antenna, and can be used to guide the adjustment of the position and attitude of the secondary reflector and the active adjustment of the main reflector panel, so as to reduce the impact of the position and attitude error of the secondary reflector and the deformation of the main reflector. effect on antenna performance. Background technique [0002] Shaped card antennas are widely used in satellite communication, deep space exploration, radio astronomy and other fields because of their high gain and good side lobe characteristics. After the main and secondary reflectors of the antenna are shaped, their generatrix is ​​no longer a sta...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 闫丰杜彪刘国玺周建寨
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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