A method for finding the focus of a reflector antenna

Abstract

The present invention relates to a method for finding the focus of a reflector antenna, and relates to the field of experimental methods. The method comprises the following steps: obtaining the approximate position of the focus by a projection method; finding a fixing point of a fine-tuning mechanism around the approximate position of the focus, and installing and fixing the fine-tuning mechanism with a tool; after the fine-tuning mechanism and the tool are installed, projecting a vertical line of a plumb bob onto the base ground and coinciding with the focus, measuring the height of the plumb bob and ensuring that it is consistent with the height of the theoretical focus, and thus determining the preliminary position of the focus; fitting a standard parabola and the focus position by a photographic method, analyzing the deviation of the tool relative to the theoretical position, adjusting the tool by a fine-tuning mechanism to eliminate the deviation, and positioning the tool at the position of the focus in space, so as to finally determine the focus position. The present invention has the advantage of being able to accurately find the focus position of the reflector antenna by a real point method.

Description

Technical Field

[0001] The present invention relates to the technical field of experimental methods, and in particular to a method for finding the focus of a reflector antenna. Background Art

[0002] A reflector antenna is an antenna that uses a metal reflector to form a predetermined beam. Figure 1 、 Figure 2 The principle of a reflector antenna is that an incident electromagnetic wave strikes the antenna's reflective surface as a parallel wave. Optical reflections on the reflector converge the waves to a focal point. Placing the feed at the focal point effectively improves the antenna's electrical performance. However, the focal point of a reflector antenna is invisible to the naked eye, making accurate location crucial.

[0003] Therefore, to address the above shortcomings, a method for finding the focus of a reflector antenna needs to be provided. Summary of the Invention

[0004] (1) Technical issues to be resolved

[0005] The technical problem to be solved by the present invention is how to accurately find the reflector antenna.

[0006] (2) Technical solution

[0007] In order to solve the above technical problems, the present invention provides a method for finding the focus of a reflector antenna, comprising the following steps:

[0008] I. Set a reference point and find the base ground projection point of the reference point using ground reference objects;

[0009] II. Draw a vertical line through the reference point. Use a level to draw a horizontal line through the projection point and perpendicular to the vertical line. Use the theoretical projection distance to determine the approximate location of the focal point.

[0010] III. Locate the fixing point of the fine-tuning mechanism around the approximate location of the focal point, and install and secure the fine-tuning mechanism with the tooling.

[0011] IV. After installing the fine-tuning mechanism and fixture, use the plumb bob to project the vertical line onto the foundation ground and have it coincide with the focus. If the height of the plumb bob is consistent with the height of the theoretical focus, the initial focus position is determined.

[0012] V. Stick a photographic target on the surface of the reflector antenna, then take a picture with a camera. Import the picture into the MPS software for data processing to obtain the 3D coordinates of each point.

[0013] VI. Fit the standard parabola and focal position, analyze the deviation of the tooling relative to the theoretical position, adjust the tooling through the fine-tuning mechanism to eliminate the deviation, and position the tooling at the focal position in space to finally determine the focal position.

[0014] As a further illustration of the present invention, preferably, the tooling is a conical structure, the flat end of the tooling is connected to the fine-tuning mechanism, and the pointed end of the tooling coincides with the focal position.

[0015] (3) Beneficial effects

[0016] The above technical solution of the present invention has the following advantages:

[0017] The present invention first applies the projection method to convert the coordinates of the three-dimensional space into two-dimensional coordinates, and then uses the plumb line to establish the third coordinate to roughly find the position of the focus. Combined with the photography method, the offset between the real point and the focus is calculated, and the real point is adjusted to the focus position through the fine-tuning mechanism to accurately find the focus. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is the schematic diagram of the reflector antenna;

[0019] Figure 2 is a schematic diagram of a reflector antenna;

[0020] Figure 3 This is a schematic diagram of the principle of the projection method for finding focus of the present invention;

[0021] Figure 4 This is a simplified diagram of the device for finding focus using the projection method of the present invention;

[0022] Figure 5 It is the target pasting surface and measurement image diagram of the present invention;

[0023] Figure 6 This is a design drawing for finding the focus of a reflecting surface in a 1m clear area using the present invention.

[0024] In the figure: 1. Reflector antenna; 11. Reflector backing; 12. Reference point; 2. Focus; 21. Fine-tuning mechanism; 3. Tooling; 4. Plumb bob. DETAILED DESCRIPTION

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0026] A method for finding the focus of a reflector antenna, such as Figure 1 As shown, the following steps are included:

[0027] I. Set a point on the reflector antenna 1 as the reference point 12, and find the base ground projection point O of the reference point 12 through a ground reference object, such as the fixing point of the reflector back frame 11 installed on the back of the reflector antenna 1.

[0028] Ⅱ. Figure 3 As shown, a vertical line OP is drawn through the projection point O of the reference point 12, and a horizontal line OQ is drawn through the projection point O and perpendicular to the vertical line OP using a level, and the approximate position of the focus 2 is obtained through the theoretical projection distance.

[0029] III. Locate the approximate location of Focus 2, locate the fixing point for fine-tuning mechanism 21, and install and secure fine-tuning mechanism 21 with fixture 3. Fine-tuning mechanism 21 features three-axis adjustment and pitch adjustment. Fixture 3 is a conical structure, with its flat end connected to fine-tuning mechanism 21. The pointed end of fixture 3 can be aligned with Focus 2, allowing the tester to clearly determine the location of Focus 2 by observing the pointed end of fixture 3, thus visualizing the location of Focus 2.

[0030] IV. Such as Figure 4 As shown, after the fine-tuning mechanism 21 and the tooling 3 are installed, a plumb bob 4 is suspended at the sharp end of the tooling 3 using a hanging rope. The vertical line of the plumb bob 4 is projected onto the foundation ground and coincides with the projection point O of the focus 2. The height of the plumb bob 4 is measured to be consistent with the height of the theoretical focus 2, thereby determining the preliminary position of the focus 2.

[0031] Ⅴ. Such as Figure 5 As shown, a photographic target is attached to the surface of the reflector antenna 1, and then photographed with a camera. The photograph is imported into the MPS software for data processing to obtain the three-dimensional coordinates of each point;

[0032] VI. Fit the standard parabola and the position of focus 2, analyze the deviation of tool 3 relative to the theoretical position, adjust tool 3 through fine-tuning mechanism 21 to eliminate the deviation, and position tool 3 at the position of focus 2 in space. At this time, the sharp corner of tool 3 is the position of focus 2, achieving the purpose of finally determining the position of focus 2.

[0033] In summary, the present invention first applies the projection method to convert the coordinates of the three-dimensional space into two-dimensional coordinates, then uses the plumb line to establish the third coordinate, roughly finds the position of the focus, combines the photography method, calculates the offset between the real point and the focus, and adjusts the real point to the focus position through the fine adjustment mechanism, such as Figure 6 As shown, you can find the focus accurately, which is very practical.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for finding the focus of a reflector antenna, characterized by: The following steps are included: I. Set a reference point and find the base ground projection point of the reference point using ground reference objects; II. Draw a vertical line through the reference point, and use a level to draw a horizontal line through the projection point and perpendicular to the vertical line. Obtain the approximate position of the focus (2) using the theoretical projection distance. Ⅲ around the focus (2) of the approximate position, find the fixing point of the fine-tuning mechanism (21), install and fix the fine-tuning mechanism (21) with the tooling (3); IV. After installing the fine-tuning mechanism (21) and the tooling (3), the plumb bob (4) is projected onto the ground and aligned with the focus (2). If the height of the plumb bob (4) is consistent with the height of the theoretical focus (2), the initial position of the focus (2) is determined. Ⅴ. Paste a photographic target on the surface of the reflector antenna (1), then take a picture with a camera, import the picture into the MPS software for data processing, and obtain the three-dimensional coordinates of each point; VI. Fitting the standard parabola and the focus (2) position, analyzing the deviation of the tooling (3) relative to the theoretical position, adjusting the tooling (3) through the fine-tuning mechanism (21) to eliminate the deviation, positioning the tooling (3) at the position of the focus (2) in space, and finally determining the focus (2) position.

2. The method for finding the focus of a reflector antenna according to claim 1, wherein: The tooling (3) is a conical structure, the flat end of the tooling (3) is connected to the fine-tuning mechanism (21), and the sharp end of the tooling (3) coincides with the focus (2).

Images