Antenna orthogonal double-pitching adjusting mechanism used in spherical near-field environment

Abstract

The invention relates to an antenna orthogonal double-pitching adjusting mechanism, in particular to an antenna orthogonal double-pitching adjusting mechanism used in a spherical near-field environment. A first rotating unit is formed by directly connecting a servo motor and a harmonic gear pair, the output end of the first rotating unit is a solid rotating shaft, an encoder is installed at the tail end of the solid rotating shaft, and full-closed-loop angle control is formed; the second rotating unit comprises a gear driven by a harmonic gear pair, the gear is meshed with a rack, so that the rack rotates around a virtual rotating axis of the rack, the rack is fixedly connected with the rectangular plate, and the virtual rotating axis and the entity rotating axis are orthogonal and coplanar; the hole-axis orthogonal adapter is provided with an orthogonal through hole, and the solid rotating shaft penetrates through the orthogonal through hole and is orthogonal to the virtual axis of the arc rack supporting frame. Under the condition that large torque output is guaranteed, the length of the output shaft in the axial direction is shortened, the mode that a virtual rotating shaft is orthogonal to a real shaft is adopted, and the coplanar posture adjusting effect of orthogonal shafts is achieved.

Description

Technical Field

[0001] This invention relates to an antenna orthogonal dual elevation adjustment mechanism, and more specifically, to an antenna orthogonal dual elevation adjustment mechanism for use in a spherical near-field environment. Background Technology

[0002] Antennas, as modern communication transceivers, are widely used in target detection, surveying, and information transmission. Antenna performance is determined by parameters such as gain, axial ratio, standing wave ratio (VSWR), beamwidth, beam pointing, and amplitude-phase consistency. To effectively test these performance indicators, the number and accuracy of the antenna attitude adjustment mechanism's degrees of freedom are crucial, directly affecting the reliability of the vector direction test results. Given that antennas typically transmit and receive signals in a fan-shaped space, the attitude adjustment mechanisms used in testing are categorized into single-axis and dual-axis attitude adjustment mechanisms in the polar coordinate measurement field.

[0003] Single-axis attitude adjustment mechanisms are mainly divided into azimuth rotation axis attitude adjustment and pitch axis attitude adjustment. Azimuth and pitch axis attitude adjustment mainly uses a high-precision one-dimensional rotary table to fix the antenna on the turntable via an adapter flange. The rotary table's rotation axis rotates in the opposite direction to the antenna's detection vector at a fixed angle, achieving full-circle rotation detection. This structure is characterized by its simplicity and high rotational accuracy, but it is limited to azimuth detection antennas and is not suitable for antennas requiring zenith angle measurement. Pitch axis attitude adjustment is mainly achieved using a crank-connecting rod structure. A high-precision displacement module is built using a lead screw and slider, along with multiple connecting rods, to convert linear displacement into antenna rotation along the rotation axis. Although this structure can achieve pitch (0~90)° range detection and can also achieve spherical space detection with the turntable, the frame structure has many mating points. The conversion from linear to angle introduces assembly errors, and the motion control is greatly affected by the movement of support points, making it difficult to control the angle positioning accuracy.

[0004] Dual-axis attitude adjustment mechanisms mainly include coplanar orthogonal dual-pitch adjustment mechanisms and non-planar orthogonal dual-pitch adjustment mechanisms. The coplanar orthogonal dual-pitch adjustment mechanism primarily uses a frame-type dual-axis rotary table as its structural basis, along with mounting fixtures. This structure allows the geometric center of the antenna mounting surface to remain unchanged in spatial position during attitude adjustment, enabling spherical region testing. However, its drawback is that the frame-type obstruction prevents further expansion of the spherical test area, limiting the detection angle range of the test antenna. Non-planar orthogonal dual-pitch adjustment mechanisms can achieve testing over a large spherical region, but the angle adjustment error on one axis will be introduced as a secondary error onto the other adjustment axis, complicating the measurement error. Summary of the Invention

[0005] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, the purpose of this invention is to propose an orthogonal dual-pitch adjustment mechanism for antennas in a spherical near-field environment. While ensuring high torque output, it shortens the axial length of the output shaft and uses a virtual rotation axis orthogonal to the real axis to achieve coplanar attitude adjustment of the orthogonal axes.

[0006] To achieve the above and other related objectives, the present invention provides an antenna orthogonal dual elevation adjustment mechanism for use in a spherical near-field environment, comprising: The first rotating unit comprises a servo motor and a harmonic gear pair directly connected together. The output end of the first rotating unit is a solid rotating shaft, and an encoder is installed at the end of the solid rotating shaft to form a fully closed-loop angle control. The second rotating unit includes a gear driven by the harmonic gear pair, the gear meshing with a rack to cause the rack to rotate around its virtual rotation axis, the rack being fixedly connected to a rectangular plate, and the virtual rotation axis being orthogonal to and coplanar with the physical rotation axis; The orthogonal adapter is provided with an orthogonal communication hole. The solid rotation axis passes through the orthogonal communication hole and is orthogonal to the virtual axis of the arc rack support frame, thereby constraining the X rotation axis and Z rotation axis in the same plane and keeping the spatial position of the intersection point unchanged.

[0007] In one embodiment of the present invention, it further includes: The antenna mounting surface is fixed on the orthogonal adapter of the hole axis, and achieves ±50° dual elevation angle adjustment with the combined movement of the first rotation unit and the second rotation unit.

[0008] In one embodiment of the present invention, it further includes: An adjustable gear support frame is disposed between the harmonic gear pair and the gear, and the adjustable gear support frame is used to adjust the distance between the center of the gear and the center of the rack; A thrust bearing cap is installed between the orthogonal adapter of the bore shaft and the antenna mounting platform of the dual pitch adjustment mechanism; The dual pitch mechanism mounting base plate is used to mount the adjustable gear support frame and the arc rack support frame.

[0009] In one embodiment of the present invention, the harmonic gear pair includes three identical rigid planetary gears and an elastic annular sun gear, and the harmonic gear pair is coaxially integrated with the servo motor using a hole output method.

[0010] In one embodiment of the present invention, the gear and the rack have the same module, and the number of teeth or the pitch circle diameter satisfies Z2 / Z1=D2 / D1=3, where Z1 is the number of teeth of the gear; Z2 is the number of teeth of the rack; D1 is the pitch circle diameter of the gear; and D2 is the pitch circle diameter of the rack.

[0011] In one embodiment of the present invention, the gear and the rack are machined using the same cutting tool.

[0012] In one embodiment of the present invention, it further includes: A limit switch is installed on the lower surface of the central reinforcing rib of the rack.

[0013] In one embodiment of the present invention, the solid rotating shaft is positioned by a pair of angular contact ball bearings within the orthogonal adapter of the shaft and bore, and the suspended end of the solid rotating shaft is the exposed portion of the direct shaft after passing through the orthogonal adapter of the shaft, which is further provided with a deep groove ball bearing.

[0014] In one embodiment of the present invention, the package size of the antenna orthogonal dual elevation adjustment mechanism for spherical near-field environment is no greater than 316mm×230mm×335mm.

[0015] As described above, the antenna orthogonal dual elevation adjustment mechanism for a spherical near-field environment of the present invention has the following beneficial effects: The present invention provides an orthogonal dual elevation adjustment mechanism for antennas in a spherical near-field environment, which replaces the frame-type two-dimensional adjustment platform and the non-plane orthogonal adjustment mechanism. It utilizes the characteristic of harmonic gear pairs to achieve large torque output in a small space.

[0016] The present invention provides an orthogonal dual-pitch adjustment mechanism for antennas in a spherical near-field environment. Through the orthogonal structure of the real axis and the virtual axis, a frameless coplanar orthogonal structure can be achieved. While keeping the spatial position of the intersection point of the dual-axis rotation unchanged, the spherical near-field test angle is expanded, avoiding interference between the antenna and the adjustment mechanism during movement.

[0017] The present invention provides an orthogonal dual elevation adjustment mechanism for antennas in a spherical near-field environment. It employs an orthogonal rotating shaft directly connected to a harmonic gear pair, which ensures the torque and rotational inertia at the shaft output end, avoids assembly errors and backlash caused by multiple structural connections, and avoids the problem of excessive axial length of the structure caused by multi-stage gear combinations of planetary transmission.

[0018] The present invention provides an orthogonal dual pitch adjustment mechanism for antennas in a spherical near-field environment. It is equipped with a high-precision encoder, and the encoder angle output value and the servo motor form a fully closed-loop control mode to ensure the accuracy of angle positioning. Attached Figure Description

[0019] Figure 1 This is a cross-sectional structural schematic diagram of an antenna orthogonal dual elevation adjustment mechanism for a spherical near-field environment according to an embodiment of the present invention; Figure 2This is a top view schematic diagram of an antenna orthogonal dual elevation adjustment mechanism for a spherical near-field environment according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the overall structure of an antenna orthogonal dual elevation adjustment mechanism for a spherical near-field environment according to an embodiment of the present invention.

[0020] The components include: 1. rack; 2. gear; 3. adjustable gear support frame; 4. thrust bearing cover; 5. orthogonal adapter for bore and shaft; 6. encoder; 7. rectangular plate; 8. solid rotating shaft; 9. arc rack support frame; 10. proximity switch; 11. servo motor; 12. dual pitch adjustment mechanism antenna mounting platform; 13. dual pitch mechanism mounting base plate; and 15. harmonic gear pair. Detailed Implementation

[0021] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0022] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0023] Terms such as "first" or "second" may be used to describe various components, but these components are not limited by the terms described above. The terms described above are used to distinguish one component from another; for example, without departing from the scope of the concept according to this disclosure, a first component may be referred to as a second component, and similarly, a second component may be referred to as a first component.

[0024] Furthermore, "connected / linked" indicates that one component is directly electrically connected to another component or indirectly electrically connected through another component. Unless otherwise explicitly stated in the sentence, the singular form may include the plural form. Additionally, the terms "comprising / including" or "containing / including" as used in this specification indicate the presence or addition of one or more components, steps, operations, and elements. Specific structural or functional descriptions of examples of embodiments of the concepts disclosed in this specification are merely illustrative to describe examples of embodiments of the concepts, and examples of embodiments of the concepts can be implemented in various forms, but these descriptions are not limited to the examples of embodiments described in this specification.

[0025] Based on the concept, various modifications and changes can be applied to examples of embodiments, such that examples of embodiments will be illustrated in the accompanying drawings and described in the specification. However, examples of embodiments based on the concept are not limited to specific embodiments, but include all changes, equivalents, or substitutions included within the spirit and scope of this disclosure.

[0026] It should be understood that when describing an element as "connected" or "linked" to another element, the element may be directly connected or linked to the other element, or it may be connected or linked to the other element via a third element. Conversely, it should be understood that when an element is described as "directly connected to" or "directly linked to" another element, no other element is placed between them. Other expressions describing relationships between components (i.e., "between" and "directly between" or "adjacent to" and "directly adjacent to") need to be interpreted in the same way.

[0027] The terminology used in this specification is for the purpose of describing specific examples of implementations only and is not intended to limit this disclosure. The singular form may include the plural form unless there is an explicit contrary meaning in the context. It should be understood in this specification that the terms "comprising" or "having" indicate the presence of the features, quantities, steps, operations, components, parts, or combinations thereof described in the specification, but do not preclude the possibility of the presence or addition of one or more other features, quantities, steps, operations, components, parts, or combinations thereof.

[0028] Unless otherwise defined, all terms used herein (including technical or scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art. If a term is not clearly defined in a common dictionary in this specification, it shall be interpreted as having the same meaning as in the context of the relevant art, and not as an ideal or overly formal meaning.

[0029] Descriptions of known components and processing techniques may be omitted to avoid unnecessarily obscuring the embodiments of this disclosure.

[0030] Throughout this specification, the same reference numerals refer to the same elements. Therefore, even if a reference numeral is not mentioned or described with reference to one drawing, it may be mentioned or described with reference to another drawing. Furthermore, even if a reference numeral is not shown in one drawing, it may be mentioned or described with reference to another drawing.

[0031] Additionally, the logic level of a signal may be different from or opposite to the logic level described. For example, a signal described as having a logic "high" level may optionally have a logic "low" level, and a signal described as having a logic "low" level may optionally have a logic "high" level.

[0032] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the embodiments of this disclosure to facilitate a better understanding of the disclosure. However, the technical solutions claimed in this disclosure can be implemented even without these technical details and various variations and modifications based on the following embodiments.

[0033] Please see Figure 1 , Figure 2 , Figure 3 , Figure 1 This is a cross-sectional structural schematic diagram of an antenna orthogonal dual elevation adjustment mechanism for a spherical near-field environment according to an embodiment of the present invention; Figure 2 This is a top view schematic diagram of an antenna orthogonal dual elevation adjustment mechanism for a spherical near-field environment according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the overall structure of an antenna orthogonal dual elevation adjustment mechanism for a spherical near-field environment according to an embodiment of the present invention.

[0034] This invention provides an orthogonal dual-pitch adjustment mechanism for an antenna in a spherical near-field environment, comprising: a first rotation unit, namely an X-axis rotation unit, comprising a servo motor 11 directly connected to a harmonic gear pair 15, the output end of the first rotation unit being a solid rotation shaft 8, the end of which is equipped with an encoder 6 to form a fully closed-loop angle control; a second rotation unit, namely a Z-axis rotation unit, comprising a gear 2 driven by the harmonic gear pair, the gear 2 meshing with a rack 1, causing the rack 1 to rotate around its virtual rotation axis, the rack 1 being fixedly connected to a rectangular plate 7, the virtual rotation axis being orthogonal and coplanar with the solid rotation axis 8; a hole-axis orthogonal adapter 5 having an orthogonal through-hole, the solid rotation shaft 8 passing through the orthogonal through-hole and being orthogonal to the virtual axis of the arc rack support frame 9, thereby constraining the X-axis and Z-axis rotations to be in the same plane and keeping the spatial position of their intersection point unchanged. The antenna mounting surface is fixed to the hole-axis orthogonal adapter 5, achieving ±50° dual-pitch angle adjustment with the combined motion of the first and second rotation units. An adjustable gear support frame 3 is disposed between the harmonic gear pair 15 and the gear 2. The adjustable gear support frame 3 is used to adjust the distance between the center of the gear 2 and the center of the rack 1. The thrust bearing cover 4 is installed between the orthogonal adapter 5 of the bore shaft and the antenna mounting platform 12 of the dual pitch adjustment mechanism. The dual pitch mechanism mounting base plate 13 is used to install the adjustable gear support frame 3 and the arc rack support frame 9.

[0035] Specifically, the harmonic gear pair 15, as part of the drive component, is directly connected to the harmonic generator via the servo motor 11. The harmonic generator then drives the flexible wheel, which performs harmonic transmission within the steel wheel. The circular arc gear 2 is another orthogonal axis transmission mechanism in the dual pitch mechanism. It is rigidly connected to the gear 2 via the harmonic gear pair 15. The gear 2 then drives the circular arc rack 1 to rotate, ultimately achieving an orthogonal rotation axis motion.

[0036] In one embodiment of the invention, utilizing the characteristics of harmonic gears—low backlash, smooth operation, and high gear ratio—a planetary gear configuration is employed. The harmonic gear pair is mounted on a servo motor with a bore output. The harmonic planetary gear consists of three rigid planetary gears of the same size and an elastically deformable annular sun gear. This allows for the output of mechanical rotation with a high speed ratio and high torque. A single orthogonal rotating shaft is directly connected to the harmonic gear pair, ensuring the torque and moment of inertia at the shaft output end. This also avoids assembly errors and backlash caused by multiple structural connections, and circumvents the problem of excessive axial length resulting from multi-stage planetary gear combinations. A high-precision encoder 6 is installed at the other end of the shaft output. The encoder 6's angle output value and the servo motor form a fully closed-loop control mode, ensuring accurate angle positioning.

[0037] In one embodiment of the invention, the output axis of another orthogonal rotating shaft is translated to the virtual rotating axis of the circular arc rack using a gear and arc rack meshing configuration. To reduce the impact of backlash error on transmission accuracy, the gear and rack are machined using the same cutting tool to ensure identical tooth profiles, tooth width, addendum, and root height. In assembly, the rack is mounted on a rectangular plate to form an "arch" structure, effectively preventing contour deformation caused by stress release after rack machining. An adjustable slot is provided on the gear mounting support frame to allow the pitch circles of the rack and gear to be tangent. For angle positioning control, an external hollow high-precision shaft angle encoder is used as a feedback unit to achieve full closed-loop control of the final output angle of the gear and rack.

[0038] In one embodiment of the present invention, a hole-shaft orthogonal adapter 5, which is machined as a single unit, is used to install the real shaft rotation axis and the virtual shaft rotation axis together. The real shaft is installed into the through hole of the orthogonal adapter, and the virtual shaft is physically represented by the axis of the rack and pinion fork through hole. The axis of symmetry of the orthogonal adapter is installed at both ends of the fork through hole, thus achieving a coplanar structure of the orthogonal rotation axes.

[0039] Specifically, the harmonic gear pair includes three identical rigid planetary gears and a flexible annular sun gear, and the harmonic gear pair is coaxially integrated with the servo motor 11 using a hole output method.

[0040] Specifically, the gear 2 has the same module as the rack 1, and the number of teeth or pitch circle diameter satisfies Z2 / Z1=D2 / D1=3, where Z1 is the number of teeth of gear 2; Z2 is the number of teeth of rack 1; D1 is the pitch circle diameter of gear 2; and D2 is the pitch circle diameter of rack 1.

[0041] Specifically, the gear 2 and the rack 1 are machined using the same cutting tool.

[0042] Specifically, the orthogonal dual-pitch adjustment mechanism for antennas in a spherical near-field environment of the present invention further includes: a limit switch 10, which is installed on the lower surface of the central reinforcing rib of the rack 1. The limit switch 10 is installed on the lower surface of the central reinforcing rib of the arc rack, and can provide I / O signal feedback through the metal sheet metal part installed near the lower surface of the rectangular plate 7 to realize the braking of the orthogonal axis therein.

[0043] Specifically, the solid rotating shaft 8 is positioned within the orthogonal adapter 5 of the bore shaft by a pair of angular contact ball bearings, and a deep groove ball bearing is added to the suspended end.

[0044] Specifically, limit switches 10 are provided for the extreme angles in both the X and Z rotation directions, with a limit angle of ±50°. Specifically, the package size of the antenna orthogonal dual pitch adjustment mechanism for spherical near-field environment is no greater than 316mm×230mm×335mm.

[0045] In one embodiment of the present invention, the mounting base plate of the antenna orthogonal dual elevation adjustment mechanism for a spherical near-field environment and the "H-shaped" circular arc rack support frame form the main support mechanism of the assembly. The "H-shaped" circular arc rack support frame is a symmetrical structure, with its intervals connected by a hole-shaft orthogonal adapter. A high-precision shaft angle encoder with hole output is installed at the shaft end. The rectangular plate and rack assembly are mounted together on the lower surface of the hole-shaft orthogonal adapter. Adjusting the adjustable gear support frame ensures that there is no backlash during gear and rack meshing. During trial rotation, if the gear drives the rack to rotate smoothly without jamming, it proves that the Z-direction rotation structure has been adjusted successfully.

[0046] In one embodiment of the invention, the harmonic planetary gear transmission mechanism is directly connected to the flange end of the X-direction transverse axis. A pair of angular contact ball bearings are installed in the orthogonal transition joint of the shaft hole, and a deep groove ball bearing is added to the suspended position of the direct connection shaft. This structure can ensure rotational accuracy and increase the stability of the rotating structure. At the other end of the X-direction transverse axis, it is connected to a high-precision angle encoder through a flexible coupling. The output of the angle encoder is used as a reference quantity, and the encoder output at the servo motor end is used as a comparison quantity. The angle position closed-loop control is used to automatically correct the angular error caused by the assembly of the structure, realizing full closed-loop control.

[0047] In one embodiment of the present invention, the Z-direction rotation drive also adopts a harmonic planetary gear mechanism connected to a servo motor. By using gears and racks with the same module and a tooth count or pitch circle diameter of 3 times, the rotation axis is translated to the rack rotation axis, forming a coplanar orthogonal axis system with the X rotation axis. At the same time, the output torque is increased again by using the gear ratio, which improves the structural rigidity of the Z-axis as the overall main support axis. When adjusting the angles in the two dimensions, the overall structural rigidity deformation is guaranteed to be less than 1μm.

[0048]

[0049] In the formula, Z1 is the number of teeth of the gear; Z2 is the number of teeth of the rack; D1 is the pitch circle diameter of the gear; and D2 is the pitch circle diameter of the rack.

[0050] In one embodiment of the present invention, the orthogonal dual elevation adjustment mechanism for antennas in a spherical near-field environment has limit switches 10 arranged at the extreme angle positions in both the X and Z rotation directions, with the extreme angles in both directions being ±50°. Two antenna mounting surfaces are symmetrically mounted in the X-axis radial direction relative to the structure, allowing direct connection to planar detection antennas such as array antennas, or to parabolic feedback antennas via tooling adapters.

[0051] In summary, the orthogonal dual-pitch adjustment mechanism for antennas in a spherical near-field environment of the present invention replaces the frame-type two-dimensional adjustment stage and the non-planar orthogonal adjustment mechanism, utilizing the characteristic of harmonic gear pairs to achieve large torque output within a small space. Through the orthogonal structure of the real and imaginary axes, a frameless coplanar orthogonal configuration can be achieved. While maintaining the spatial position of the intersection point of the dual-axis rotation, the spherical near-field testing angle is expanded, avoiding interference between the antenna and the adjustment mechanism during movement.

[0052] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. An orthogonal dual-pitch adjustment mechanism for antennas in a spherical near-field environment, characterized in that, include: The first rotating unit is composed of a servo motor (11) and a harmonic gear pair (15) directly connected. The output end of the first rotating unit is a solid rotating shaft (8). An encoder (6) is installed at the end of the solid rotating shaft (8) to form a closed-loop angle control. The second rotating unit includes a gear (2) driven by the harmonic gear pair (15), the gear (2) meshing with the rack (1) to make the rack (1) rotate around its virtual rotation axis, the rack (1) being fixedly connected to the rectangular plate (7), and the virtual rotation axis being orthogonal and coplanar with the physical rotation axis (8); The orthogonal adapter (5) is provided with an orthogonal communication hole. The solid rotation axis (8) passes through the orthogonal communication hole and is orthogonal to the virtual axis of the arc rack support frame (9), thereby constraining the X rotation axis and Z rotation axis in the same plane and keeping the spatial position of the intersection point unchanged.

2. The antenna orthogonal dual elevation adjustment mechanism for a spherical near-field environment according to claim 1, characterized in that, Also includes: The antenna mounting surface is fixed on the orthogonal adapter (5) of the hole axis, and achieves ±50° dual elevation angle adjustment with the combined movement of the first rotating unit and the second rotating unit.

3. The antenna orthogonal dual elevation adjustment mechanism for a spherical near-field environment according to claim 2, characterized in that, Also includes: An adjustable gear support frame (3) is disposed between the harmonic gear pair (15) and the gear (2). The adjustable gear support frame (3) is used to adjust the distance between the center of the gear (2) and the center of the rack (1). A thrust bearing cap (4) is installed between the orthogonal adapter (5) of the bore shaft and the antenna mounting platform (12) of the dual pitch adjustment mechanism; The dual pitch mechanism mounting base plate (13) is used to install the adjustable gear support frame (3) and the arc rack support frame (9).

4. The antenna orthogonal dual elevation adjustment mechanism for spherical near-field environment according to claim 3, characterized in that: The harmonic gear pair (15) includes three identical rigid planetary gears and a flexible annular sun gear. The harmonic gear pair is coaxially integrated with the servo motor (11) using a hole output method.

5. The antenna orthogonal dual elevation adjustment mechanism for spherical near-field environment according to claim 3, characterized in that: The gear (2) has the same module as the rack (1), and the number of teeth or pitch circle diameter satisfies Z2 / Z1=D2 / D1=3, where Z1 is the number of teeth of the gear (2); Z2 is the number of teeth of the rack (1); D1 is the pitch circle diameter of the gear (2); and D2 is the pitch circle diameter of the rack (1).

6. The antenna orthogonal dual elevation adjustment mechanism for spherical near-field environment according to claim 5, characterized in that: The gear (2) and the rack (1) are machined using the same cutting tool.

7. The antenna orthogonal dual elevation adjustment mechanism for a spherical near-field environment according to claim 3, characterized in that, Also includes: Limit switch (10) is installed on the lower surface of the central reinforcing rib of the rack (1).

8. The antenna orthogonal dual elevation adjustment mechanism for spherical near-field environment according to claim 3, characterized in that: The solid rotating shaft (8) is positioned by a pair of angular contact ball bearings in the orthogonal adapter (5) of the shaft. The suspended end of the solid rotating shaft (8) is the exposed part of the straight shaft after passing through the orthogonal adapter (5) with an added deep groove ball bearing.

9. The antenna orthogonal dual elevation adjustment mechanism for a spherical near-field environment according to any one of claims 1 to 8, characterized in that: The package size of the antenna orthogonal dual pitch adjustment mechanism for spherical near-field environment is no greater than 316mm×230mm×335mm.

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