Calibration device for OTA test system and OTA test system

Abstract

The utility model provides a calibration device for an OTA test system and the OTA test system. The calibration device is used for calibrating a probe of an OTA test system, and comprises a horn antenna; the substrate is provided with a mounting surface for mounting the horn antenna, and the mounting surface faces the probe; the horn mouth of the horn antenna is deviated from the mounting surface; the test instrument is connected to the horn antenna and the probe and is used for calibrating the probe; the rotation driving mechanism is connected to the horn antenna and used for driving the horn antenna to rotate around the central axis of the horn mouth; wherein the central axis of the horn mouth is perpendicular to the mounting surface; the movement driving mechanism is connected to the horn antenna and is used for driving the horn antenna to move along a preset direction parallel to the mounting surface; and the control mechanism is connected to the rotation driving mechanism and the movement driving mechanism and used for controlling the rotation driving mechanism and the movement driving mechanism. According to the calibration device, the time for calibrating the probe in the calibration process can be shortened, and the purpose of improving the test efficiency is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of wireless communications, and in particular to a calibration device for an OTA test system and an OTA test system. Background Art

[0002] An Over-The-Ai r Chamber (OTA) is a test environment specially designed to evaluate the performance of mobile communication equipment. It usually simulates the actual communication environment and calibrates the 5G substrate antenna to ensure that these antennas can provide reliable and efficient wireless connections in the actual network.

[0003] In the calibration of 5G base station antennas, the working principle of the OTA chamber involves simulating the wireless signal transmission environment to evaluate the performance of the antenna. The OTA chamber uses electromagnetic isolation materials and shielding structures to block external wireless signals and create a controlled test environment to ensure that only wireless signals between the device under test and the test system exist in the test device. The test system in the OTA chamber sends control signals to the device under test through a specially designed antenna to simulate the wireless signal transmission in actual communication. In the OTA chamber, the test system simulates signal propagation in free space to examine the performance of the device antenna at different directions, distances, and angles.

[0004] Generally speaking, OTA chambers use probes or other test equipment to measure the performance of 5G base station antennas, including parameters such as received signal strength, signal-to-noise ratio, and beamforming. The probes in OTA chambers help evaluate the performance of devices in real communication environments by simulating the performance of device antennas and measuring received signals, which helps ensure that the device can provide reliable wireless connections in various situations.

[0005] In order to ensure that the probe can provide accurate, reliable and repeatable measurement data in actual testing, the probe is generally calibrated. The current common method is to calibrate the probe manually. That is, the calibration of each probe is completed by aligning the horn antenna with the polarization direction of the probe. For example, there are 8 probes in the OTA darkroom, and there are two polarization angles at each probe position. When polarizing the probe, the staff needs to enter and exit the OTA darkroom 16 times to adjust the position of the horn antenna to align the 8 probes. This manual calibration method is time-consuming and labor-intensive, and requires the staff to manually install the horn antenna multiple times to complete the calibration of all probes. Utility Model Content

[0006] The utility model aims to solve at least one of the technical problems existing in the prior art, and proposes a calibration device for an OTA test device, which can solve the technical problem of low efficiency caused by manual calibration in the related art.

[0007] To achieve the above-mentioned purpose, an embodiment of the utility model provides a calibration device for an OTA test system, the calibration device is used to calibrate the probe of the OTA test system, and the calibration device includes: a horn antenna; a substrate, having a mounting surface for mounting the horn antenna, the mounting surface facing the probe; the horn mouth of the horn antenna is set away from the mounting surface; a test instrument, connected to the horn antenna and the probe, the test instrument is used to calibrate the probe according to the performance difference between the horn antenna and the probe; a rotation drive mechanism, connected to the horn antenna, the rotation drive mechanism is used to drive the horn antenna to rotate around the central axis of its horn mouth; wherein the central axis of the horn mouth is perpendicular to the mounting surface; a moving drive mechanism, connected to the horn antenna, the moving drive mechanism is used to drive the horn antenna to move along a preset direction parallel to the mounting surface; a control mechanism, connected to the rotation drive mechanism and the moving drive mechanism, the control mechanism is used to control the rotation drive mechanism and the moving drive mechanism.

[0008] In some embodiments, the mobile drive mechanism includes a first mobile drive mechanism and a second mobile drive mechanism; the first mobile drive mechanism is arranged on the mounting surface and connected to the rotation drive mechanism, and the first mobile drive mechanism is used to drive the rotation drive mechanism to move along a first preset direction parallel to the mounting surface to drive the horn antenna to move along the first preset direction; the second mobile drive mechanism is connected to the substrate, and the second mobile drive mechanism is used to drive the substrate to move along a second preset direction parallel to the mounting surface to drive the horn antenna to move along the second preset direction.

[0009] In some embodiments, the first preset direction is perpendicular to the second preset direction.

[0010] In some embodiments, the first mobile drive mechanism includes: a slide rail, which is arranged on the mounting surface, the slide rail extends along a first preset direction, and the rotation drive mechanism is movably arranged on the slide rail; a drive motor, which is connected to the rotation drive mechanism, and the drive motor is used to drive the rotation drive mechanism to move on the slide rail along the first preset direction.

[0011] In some embodiments, the rotation drive mechanism includes: a rotating disk, on which the horn antenna is disposed; a cylinder, connected to the rotating disk and the first mobile drive mechanism; and an air supply mechanism, connected to the cylinder, which is used to provide gas to the cylinder so that the cylinder drives the rotating disk to rotate around its central axis to drive the horn antenna to rotate.

[0012] In some embodiments, the second mobile driving mechanism includes: a workbench, a substrate is arranged on the workbench, and the substrate is located between the workbench and the probe; a driving member connected to the workbench, and the driving member is used to drive the workbench to move along the second preset direction to drive the substrate to move along the second preset direction.

[0013] In some embodiments, it also includes: a first container having a first accommodating space, the first container being arranged on the mounting surface; a winding mechanism being rotatably and movably arranged in the first accommodating space, the winding mechanism having a accommodating groove for the cable of the calibration device to be wound in a circle, and the winding mechanism is used to release or store the cable of the calibration device as the horn antenna moves away from or approaches the first container.

[0014] In some embodiments, the calibration device also includes a second accommodating member having a second accommodating space, the second accommodating member is arranged on the mounting surface, and the control mechanism is arranged in the second accommodating space; the control mechanism also includes a PLC, and the PLC is used to output the direction and distance of movement of the horn antenna to the mobile driving mechanism after obtaining the current position of the horn antenna and the current position of the probe, and also output the angle of rotation of the horn antenna to the rotation driving mechanism.

[0015] In some embodiments, the test instrument includes a vector network analyzer.

[0016] An embodiment of the utility model also provides an OTA testing system, including an OTA darkroom and multiple probes arranged in the OTA darkroom, and the inner wall of the OTA darkroom is provided with absorbing material; the OTA testing system also includes a calibration device for calibrating each probe in the OTA darkroom, and the calibration device is the above-mentioned calibration device.

[0017] Other objects and features of the present invention will become clear by reading the specification, claims and drawings of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 It is a front view of the calibration device according to an embodiment of the utility model.

[0020] Figure 2 It is a side view of the calibration device according to an embodiment of the present utility model.

[0021] Figure 3 It is a structural schematic diagram of the OTA darkroom in the embodiment of the utility model.

[0022] Figure 4 It is a schematic diagram of the positions of multiple probes in an OTA darkroom according to an embodiment of the present utility model.

[0023] Description of main component symbols:

[0024] 10. Calibration device; 20. Probe; 30. OTA darkroom;

[0025] 100, substrate; 110, mounting surface;

[0026] 200, horn antenna;

[0027] 310, driving motor; 320, slide rail;

[0028] 410, cylinder; 420, rotating disk; 430, bearing member;

[0029] 510. Workbench;

[0030] 610, first receiving member; 620, second receiving member;

[0031] 700. Winding mechanism. DETAILED DESCRIPTION

[0032] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0033] Figure 1 It is a front view of the calibration device 10 according to the embodiment of the present utility model. Figure 2 is a side view of the calibration device 10 according to an embodiment of the present invention. Figure 1 and Figure 2 The calibration device 10 is used for an OTA test system, and the calibration device 10 is used to calibrate a probe 20 of the OTA test system to improve the precision and accuracy of the OTA test system.

[0034] The calibration device 10 includes a horn antenna 200, a substrate 100, a test instrument, a rotation drive mechanism, a movement drive mechanism and a control mechanism.

[0035] The horn mouth of the horn antenna 200 faces the probe 20. Specifically, the substrate 100 has a mounting surface 110 for mounting the horn antenna 200, and the mounting surface 110 faces the probe 20. The horn mouth of the horn antenna 200 is arranged away from the mounting surface 110.

[0036] The test meter is connected to the horn antenna 200 and the probe 20 , and the test meter is used to calibrate the probe 20 according to the performance difference between the horn antenna 200 and the probe 20 .

[0037] The rotation drive mechanism is connected to the horn antenna 200, and the rotation drive mechanism is used to drive the horn antenna 200 to rotate around the central axis of the horn mouth. The central axis of the horn mouth is perpendicular to the mounting surface 110. The mobile drive mechanism is connected to the horn antenna 200, and the mobile drive mechanism is used to drive the horn antenna 200 to move along a preset direction parallel to the mounting surface 110. The control mechanism is connected to the rotation drive mechanism and the mobile drive mechanism. The control mechanism is used to control the rotation drive mechanism and the mobile drive mechanism.

[0038] The rotation drive mechanism and the movement drive mechanism of the calibration device 10 of this embodiment can respectively drive the horn antenna 200 to rotate and move until it is aligned with the probe 20, so as to shorten the distance between the horn antenna 200 and the probe 20 when the test instrument calibrates the probe 20, thereby improving the accuracy of calibration. The alignment includes position alignment and polarization alignment. The calibration device 10 of this embodiment is suitable for an OTA test system with multiple probes 20. Compared with the manual calibration probe 20 in the related art, it can reduce the time for installing the horn antenna 200 and the calibration probe 20 during the calibration process, thereby achieving the purpose of improving the test efficiency.

[0039] It should be noted that the horn antenna 200 can transmit or receive electromagnetic waves, and the probe 20 is used to receive or transmit these electromagnetic waves accordingly. When calibrating the probe 20, the mobile drive mechanism and the rotation drive mechanism can drive the horn antenna 200 to a position aligned with the probe 20 to simulate different communication conditions and directions in actual use, thereby ensuring that the calibration of the probe 20 is comprehensive and accurate.

[0040] In some embodiments, the horn antenna 200 is a ±45° dual-polarized antenna, so as to be able to transmit or receive signals in polarization directions of 45° and −45°. In other embodiments, the horn antenna 200 is a single-polarized antenna with a fixed polarization direction.

[0041] The mobile drive mechanism includes a first mobile drive mechanism and a second mobile drive mechanism. The first mobile drive mechanism is disposed on the mounting surface 110 and connected to the rotation drive mechanism. The first mobile drive mechanism is used to drive the rotation drive mechanism to move along a first preset direction parallel to the mounting surface 110, so as to drive the horn antenna 200 to move along the first preset direction. The second mobile drive mechanism is connected to the substrate 100. The second mobile drive mechanism is used to drive the substrate 100 to move along a second preset direction parallel to the mounting surface 110, so as to drive the horn antenna 200 to move along the second preset direction.

[0042] In some embodiments, the first preset direction is perpendicular to the second preset direction.

[0043] Indicatively, Figure 1 The X in can be used to indicate the first preset direction, Figure 2 and Figure 3 The Y in can be used to indicate the second preset direction. Figures 1 to 4 The Z in the figure may be used to indicate a direction parallel to the rotation axis of the horn antenna 200. It is to be understood that the above directions are only indicated for a better understanding of the embodiments of the present disclosure, and are not intended to limit the embodiments of the present disclosure.

[0044] The first moving driving mechanism includes a slide rail 320 and a driving motor 310. The slide rail 320 is arranged on the mounting surface 110, and the slide rail 320 is extended along the first preset direction, and the rotation driving mechanism is movably arranged on the slide rail 320. The driving motor 310 is connected to the rotation driving mechanism, and the driving motor 310 is used to drive the rotation driving mechanism to move on the slide rail 320 along the first preset direction.

[0045] Specifically, the first moving drive mechanism may further include a screw rod, which, in conjunction with accurate control by the control mechanism, can achieve a linear tolerance of ±0.1 mm and an angular tolerance of ±0.1° for the positioning accuracy of the probe 20 .

[0046] The rotation drive mechanism includes a rotating disk 420, a cylinder 410 and an air supply mechanism. The horn antenna 200 is arranged on the rotating disk 420, and the horn mouth of the horn antenna 200 is arranged away from the rotating disk 420. The cylinder 410 is connected to the rotating disk 420 and the first moving drive mechanism. The air supply mechanism is connected to the cylinder 410, and the air supply mechanism is used to provide gas to the cylinder 410, so that the cylinder 410 drives the rotating disk 420 to rotate around its central axis, thereby driving the horn antenna 200 to rotate.

[0047] In some embodiments, the calibration device 10 further includes a support member 430 , the support member 430 is disposed on the first mobile driving mechanism, the cylinder 410 is disposed on the support member 430 , and the support member 430 is used to support the rotation driving mechanism.

[0048] The second moving driving mechanism includes a workbench 510 and a driving member. The substrate 100 is disposed on the workbench 510, and the substrate 100 is located between the workbench 510 and the probe 20. The driving member is connected to the workbench 510, and the driving member is used to drive the workbench 510 to move along the second preset direction, so as to drive the substrate 100 to move along the second preset direction.

[0049] In this embodiment, the workbench 510 can be installed in the OTA darkroom 30 .

[0050] See also Figure 2The calibration device 10 further includes a first container 610 and a reeling mechanism 700. The first container 610 has a first accommodating space, and the first container 610 is disposed on the mounting surface 110. The reeling mechanism 700 is rotatably and movably disposed in the first accommodating space, and the reeling mechanism 700 has an accommodating groove for the cables of the calibration device 10 to be wound and placed in a circle, and the reeling mechanism 700 is used to release or store the cables of the calibration device 10 as the horn antenna 200 moves away from or approaches the first container 610, so as to ensure the neatness of the calibration device 10. Similarly, the pipeline of the air supply mechanism can also be disposed on the reeling mechanism 700.

[0051] In some embodiments, the first container 610 is made of non-metal to reduce reflection. In other embodiments, the first container 610 is made of metal, and the outer surface of the first container 610 facing the probe 20 is provided with absorbing material to reduce reflection.

[0052] It should be noted that when the surface of the first receiving member 610 is provided with an absorbing material, the height of the first receiving member 610 cannot exceed the lowest point of the horn antenna 200 .

[0053] The calibration device 10 further includes a second accommodating member 620. The control mechanism further includes a PLC. The second accommodating member 620 has a second accommodating space, the second accommodating member 620 is disposed on the mounting surface 110, and the control mechanism is disposed in the second accommodating space.

[0054] The PLC is used to output the direction and distance of movement of the horn antenna 200 to the mobile drive mechanism after obtaining the current position of the horn antenna 200 and the current position of the probe 20, and also output the rotation angle of the horn antenna 200 to the rotation drive mechanism.

[0055] It should be noted that the staff can input the current position of the horn antenna 200 and the current position of the probe 20 to the PLC through a certain user interface (such as a computer, a human-machine interface, etc.), wherein the current position may include an angle, a distance, a direction, etc. After receiving the above position information input by the staff, the PLC performs parsing and processing. According to the user input, the PLC can understand the specific position of the horn antenna 200 and the probe 20. The PLC uses a pre-written control algorithm to adjust the position of the horn antenna 200 to align the probe 20 according to the position information of the probe 20 and the horn antenna 200. The PLC adjusts the position of the horn antenna 200 by outputting a control signal to the rotation drive mechanism and the mobile drive mechanism to ensure that the horn antenna 200 moves according to the calculated instructions. The horn antenna 200 is also configured with a position feedback system, such as an encoder or a position sensor, to monitor its current position in real time. The PLC can ensure that the horn antenna 200 moves along the expected path by reading these position feedback signals. The PLC in this embodiment can implement closed-loop control, and continuously adjust the output signal according to the difference between the actual position and the expected position to achieve precise control of the position of the horn antenna 200. Once the horn antenna 200 is adjusted to a position aligned with the probe 20 , the PLC will issue a command to stop the movement to ensure that the horn antenna 200 remains in the correct position.

[0056] This embodiment realizes automatic control of the rotation and movement of the horn antenna 200 through PLC to automatically locate the position and polarization direction of the horn antenna 200, thereby reducing the measurement error caused by position or polarization direction errors introduced by human operation and improving the accuracy of the calibration probe 20.

[0057] In some embodiments, the control mechanism may include not only a PLC (programmable logic controller) but also a solenoid valve, a relay and a circuit breaker. Solenoid valves, relays and circuit breakers can be used to achieve automatic control, electrical protection and fault isolation. The solenoid valve is an electric control valve that controls the flow of gas through the signal output by the PLC. When the horn antenna 200 needs to move, the PLC can be used to control the action of the cylinder 410 through the solenoid valve. The relay is used to switch electrical equipment in the circuit. When the horn antenna 200 needs to rotate, the drive motor 310 can be controlled by the signal output by the PLC. The relay can be used as a switch between the PLC and these devices to achieve control and isolation. The circuit breaker is used to provide overload protection and short circuit protection in the circuit. When the current in the circuit exceeds the rated value, the circuit breaker will cut off the circuit to prevent the PLC mechanism from being damaged or the circuit from catching fire.

[0058] In the control mechanism of this embodiment, the electromagnetic valve, relay and circuit breaker are used to ensure the safety of the circuit and reduce the risk of circuit failure. The electromagnetic valve, relay and other components allow the PLC to accurately control the movement and rotation of the horn antenna 200, thereby realizing complex automation logic.

[0059] In this embodiment, the PLC host computer controls the movement and rotation of the horn antenna 200, so that the horn antenna 200 can finally be aligned in position and polarization with the probe 20, and the fully automatic calibration of the amplitude and phase consistency of the probe 20 in the OTA test system is completed. The inventors of the present disclosure have experimentally proved that in the manual calibration embodiment of the related technology, it takes 1300 seconds to calibrate the amplitude and phase of 8 probes 20 in the OTA test system; while in the automatic calibration of this embodiment, it takes 500 seconds to calibrate the amplitude and phase of 8 probes 20 in the OTA test system, which significantly shortens the calibration time and improves the calibration efficiency.

[0060] In some embodiments, the second container 620 is made of non-metal to reduce reflection. In other embodiments, the second container 620 is made of metal, and the outer surface of the second container 620 facing the probe 20 is provided with absorbing material to reduce reflection.

[0061] It should be noted that when the surface of the second receiving member 620 is provided with an absorbing material, the height of the second receiving member 620 cannot exceed the lowest point of the horn antenna 200 .

[0062] In some embodiments, the test instrument includes a vector network analyzer.

[0063] In some implementations, the OTA test system includes an OTA darkroom and a plurality of probes 20, wherein the plurality of probes 20 are disposed in the OTA darkroom. The inner wall of the OTA darkroom is provided with an absorbing material. The OTA test system also includes a calibration device 10, which is used to calibrate each probe 20 in the OTA darkroom.

[0064] Figure 4 Schematic diagram of the positions of multiple probes 20 in the OTA darkroom 30 according to the embodiment of the present invention. Figure 4 ,The OTA test system includes 8 probes 20 , and the calibration device 10 in this embodiment can calibrate each probe 20 .

[0065] In some embodiments, the probe 20 is movably arranged, and the control mechanism can control the probe 20 to move along the first preset direction and the second preset direction until the position is aligned with the horn antenna 200. The horn antenna 200 is rotatably arranged, and the control mechanism can control the horn antenna 200 to rotate until the polarization is aligned with the probe 20.

[0066] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0067] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0068] In the description of this specification, the description with reference to the terms "one embodiment", "certain embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0069] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A calibration device for an OTA test system, characterized in that: The calibration device is used to calibrate the probe of the OTA test system, and the calibration device includes: Horn antenna; A substrate having a mounting surface for mounting the horn antenna, the mounting surface facing the probe; the horn mouth of the horn antenna is arranged away from the mounting surface; A test meter connected to the horn antenna and the probe, the test meter being used to calibrate the probe according to a performance difference between the horn antenna and the probe; A rotation drive mechanism connected to the horn antenna, the rotation drive mechanism is used to drive the horn antenna to rotate around the central axis of the horn mouth; wherein the central axis of the horn mouth is perpendicular to the mounting surface; A mobile driving mechanism, connected to the horn antenna, and used for driving the horn antenna to move along a preset direction parallel to the mounting surface; A control mechanism is connected to the rotation drive mechanism and the movement drive mechanism, and is used to control the rotation drive mechanism and the movement drive mechanism.

2. The calibration device for an OTA test system according to claim 1, characterized in that: The mobile drive mechanism includes a first mobile drive mechanism and a second mobile drive mechanism; The first mobile driving mechanism is disposed on the mounting surface and connected to the rotation driving mechanism, and the first mobile driving mechanism is used to drive the rotation driving mechanism to move along a first preset direction parallel to the mounting surface, so as to drive the horn antenna to move along the first preset direction; The second moving driving mechanism is connected to the substrate, and is used to drive the substrate to move along a second preset direction parallel to the mounting surface, so as to drive the horn antenna to move along the second preset direction.

3. The calibration device for an OTA test system according to claim 2, characterized in that: The first preset direction is perpendicular to the second preset direction.

4. The calibration device for an OTA test system according to claim 2, characterized in that: The first mobile driving mechanism comprises: A slide rail is arranged on the mounting surface, the slide rail is extended along the first preset direction, and the rotation drive mechanism is movably arranged on the slide rail; A drive motor is connected to the rotation drive mechanism, and the drive motor is used to drive the rotation drive mechanism to move along the first preset direction on the slide rail.

5. The calibration device for an OTA test system according to claim 2, characterized in that: The rotation drive mechanism comprises: a rotating disk, wherein the horn antenna is disposed on the rotating disk; A cylinder connected to the rotating disk and the first moving drive mechanism; An air supply mechanism is connected to the cylinder, and is used to provide gas to the cylinder so that the cylinder drives the rotating disk to rotate around its central axis, thereby driving the horn antenna to rotate.

6. The calibration device for an OTA test system according to claim 2, characterized in that: The second mobile driving mechanism comprises: A workbench, the substrate is arranged on the workbench, and the substrate is located between the workbench and the probe; A driving member is connected to the workbench, and is used to drive the workbench to move along the second preset direction, so as to drive the substrate to move along the second preset direction.

7. The calibration device for an OTA test system according to claim 1, characterized in that: Also includes: A first accommodating member having a first accommodating space, wherein the first accommodating member is disposed on the mounting surface; The reeling mechanism is rotatably and movably arranged in the first accommodating space, and the reeling mechanism has an accommodating groove for the cable of the calibration device to be wound in a circle. The reeling mechanism is used to release or store the cable of the calibration device as the horn antenna moves away from or approaches the first accommodating member.

8. The calibration device for an OTA test system according to claim 1, characterized in that: The calibration device further comprises a second accommodating member having a second accommodating space, the second accommodating member is arranged on the mounting surface, and the control mechanism is arranged in the second accommodating space; The control mechanism also includes a PLC, which is used to output the direction and distance of movement of the horn antenna to the mobile drive mechanism after obtaining the current position of the horn antenna and the current position of the probe, and also output the rotation angle of the horn antenna to the rotation drive mechanism.

9. The calibration device for an OTA test system according to claim 1, characterized in that: The test instrument includes a vector network analyzer.

10. An OTA test system, characterized in that: It comprises an OTA darkroom and a plurality of probes arranged in the OTA darkroom, wherein the inner wall of the OTA darkroom is provided with an absorbing material; The OTA testing system further includes a calibration device for calibrating each of the probes in the OTA darkroom, wherein the calibration device is the calibration device described in any one of claims 1 to 9 above.

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