Phased-array antenna system near-field calibration device and method thereof

Abstract

The invention provides a near-field calibration device and method for a phased-array antenna system. The phased-array antenna system comprises a phased-array antenna and a plurality of radio frequency links, the phased-array antenna comprises a plurality of antenna units, and the plurality of antenna units are correspondingly connected with the plurality of radio frequency links to form a plurality of channels. The calibration device comprises a vector network analyzer, a positioning device and a calibration antenna. The calibration antenna is fixed on the positioning device, and the positioning device is used for selectively aligning the calibration antenna with one antenna unit in the phased-array antenna; the vector network analyzer is provided with a first port and a second port, the first port is connected with the calibration antenna, and the second port is used for being connected with a radio frequency link where the antenna unit aligned with the calibration antenna is located. The first port comprises one of the transmitting port and the receiving port, and the second port comprises the other one of the transmitting port and the receiving port. According to the invention, the calibration process can be simplified and the calibration precision can be improved.

Description

Technical Field

[0001] The present application relates to the field of antenna calibration technology, and in particular to a near-field calibration device and method for a phased array antenna system. Background Art

[0002] Active phased array antennas are composed of a large number of antenna elements arranged in a certain pattern. The amplitude and phase of each antenna element can be independently controlled. They have attracted much attention for their flexibility and multi-beam capabilities, offering significant advantages in fields such as phased array radar, mobile communications, and radio astronomy. With the advancement of semiconductor technology and the miniaturization of antenna design, the number of elements in phased arrays has increased significantly. RF synchronization between element channels is a key technology for the application of phased array systems. However, phase and amplitude errors are inevitably introduced during the integration of large-scale phased array systems due to the components, manufacturing, and assembly processes. Phased array systems should be vector-calibrated during the production and commissioning phases to compensate for potential errors before actual operation. This is necessary to achieve optimal performance, realize the desired beam pattern, precisely control sidelobe levels, and enhance overall system performance. Calibration of large-scale phased array antenna systems is one of the key technologies to ensure their proper operation.

[0003] Common phased array antenna calibration techniques include: near-field calibration technology, peripheral fixed probe calibration technology, far-field calibration technology, built-in coupling network calibration technology, mutual coupling calibration technology, etc. The traditional near-field scanning probe method relies on a precise automated mechanical positioning system and is mostly tested in a microwave darkroom; the peripheral fixed probe method requires complex hardware and algorithms; the installation of the probe antenna in the far field area in the far-field calibration method is often a major problem; the built-in coupling network calibration technology requires additional circuit hardware to be considered at the beginning of the design, and the inconsistency introduced by the coupling power divider network will also affect the calibration effect; the mutual coupling calibration technology is only applicable to phased array systems that can individually control the working mode of each receive / transmitter unit. These methods not only increase hardware costs and system complexity, but also have high requirements for the test environment and high calibration facility costs, making the development and implementation of calibration technology more time-consuming and challenging. Summary of the Invention

[0004] The purpose of the present application is to provide a near-field calibration device and method for a phased array antenna system, which can solve at least one of the technical problems mentioned in the above prior art.

[0005] One aspect of the present application provides a near-field calibration device for a phased array antenna system. The phased array antenna system includes a phased array antenna and multiple radio frequency chains. The phased array antenna includes multiple antenna units, and the multiple antenna units are respectively connected to the multiple radio frequency chains to form multiple channels. The calibration device includes a vector network analyzer, a positioning device, and a calibration antenna, wherein the calibration antenna is fixed on the positioning device, and the positioning device is used to selectively align the calibration antenna with one of the antenna units in the phased array antenna; the vector network analyzer has a first port and a second port, the first port is connected to the calibration antenna, and the second port is used to connect to the radio frequency link where the antenna unit aligned with the calibration antenna is located. The first port includes one of a transmitting port and a receiving port, and the second port includes the other of a transmitting port and a receiving port.

[0006] Furthermore, the positioning device has a first side and a second side opposite to each other, the calibration antenna is fixed on the first side of the positioning device, and one of the plurality of antenna units can be positioned on the second side of the positioning device.

[0007] Furthermore, the calibration antenna is vertically arranged above the array plane of the phased array antenna, and the radiation direction of the calibration antenna is vertically toward the array plane of the phased array antenna.

[0008] Furthermore, the calibration device also includes a power supply control module for controlling the opening of the plurality of radio frequency links connected to the phased array antenna.

[0009] Furthermore, one of the multiple antenna units serves as a reference antenna unit, and the vector network analyzer is used to read the amplitude and phase information of the reference channel where the reference antenna unit is located and the channels where the remaining antenna units are located. The calibration device also includes: a data acquisition and storage device, which is used to control the vector network analyzer and save the amplitude and phase information of the reference channel and the amplitude and phase information of each channel relative to the reference channel.

[0010] Furthermore, the vector network analyzer is configured with a time domain reflectometer option.

[0011] Another aspect of the present application provides a near-field calibration method for a phased array antenna system. The phased array antenna system includes a phased array antenna and multiple radio frequency links. The phased array antenna includes multiple antenna units, and the multiple antenna units are respectively connected to the multiple radio frequency links to form multiple channels. The method includes: fixing a calibration antenna on a positioning device; aligning the calibration antenna with each antenna unit in the phased array antenna in turn by moving the positioning device; fixing a first port of a vector network analyzer to the calibration antenna and connecting a second port of the vector network analyzer in turn to the radio frequency links of each antenna unit aligned with the calibration antenna, wherein the first port includes one of a transmitting port and a receiving port, and the second port includes the other of the transmitting port and the receiving port; sequentially transmitting and receiving signals through the transmitting port and the receiving port of the vector network analyzer, and sequentially obtaining the amplitude and phase information of each channel; and calibrating each channel of the phased array antenna system based on the amplitude and phase information of each channel.

[0012] Furthermore, calibrating each channel of the phased array antenna system according to the amplitude and phase information of each channel includes: selecting one of the antenna units as a reference antenna unit; and calibrating each channel of the phased array antenna system according to the amplitude and phase information of the reference channel where the reference antenna unit is located and the amplitude and phase information of each channel relative to the reference channel.

[0013] Furthermore, calibrating each channel of the phased array antenna system based on the amplitude and phase information of the reference channel where the reference antenna unit is located and the amplitude and phase information of each channel relative to the reference channel includes: determining the compensated amplitude and phase information of the reference channel when the amplitude and phase information of the predetermined frequency point of the reference channel is compensated to 0dB / 0°; and calibrating each channel of the phased array antenna system based on the compensated amplitude and phase information of the reference channel and the amplitude and phase information of each channel relative to the reference channel.

[0014] Furthermore, the method further includes: controlling, by a power supply control module, to enable each radio frequency link connected to each antenna unit in the phased array antenna.

[0015] Furthermore, the method further includes: performing parameter setting and calibration of the vector network analyzer according to the operating frequency and gain of the phased array antenna and the radio frequency link connected to each antenna unit of the phased array antenna.

[0016] One or more embodiments of the present application may provide a near-field calibration device and method for a phased array antenna system, and may have at least the following beneficial technical effects: (1) This application designs a positioning device that can quickly align the calibration antenna with one of the antenna elements in the phased array antenna, thereby quickly completing the near-field calibration of a feasible phased array antenna system; (2) This application effectively reduces the complexity of the calibration system and the requirements for the environment, improves the calibration accuracy of each channel of the phased array antenna system, and helps optimize the phased array antenna pattern and improve the system performance; (3) This application improves the feasibility of phased array antenna system calibration and expands its application scope. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of a near-field calibration device for a phased array antenna system according to an embodiment of the present application.

[0018] Figure 2 This is a flowchart of a near-field calibration method for a phased array antenna system according to one embodiment of the present application.

[0019] Figure 3 This is a diagram showing the specific steps of a near-field calibration method for a phased array antenna system according to an embodiment of the present application. DETAILED DESCRIPTION

[0020] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of devices consistent with certain aspects of the present application, as detailed in the appended claims.

[0021] The near-field calibration device and method of the phased array antenna system of the present application will be described in detail below with reference to the accompanying drawings. In the absence of conflict, the features of the following embodiments and implementations can be combined with each other.

[0022] The present application provides a near-field calibration device for a phased array antenna system. Figure 1 The present invention discloses a schematic diagram of a near-field calibration device for a phased array antenna system according to an embodiment of the present invention. Figure 1 As shown, phased array antenna system 140 includes a phased array antenna 141 and multiple RF chains 142. Phased array antenna 141 includes multiple antenna elements 1410. As an example, the spacing between antenna elements 1410 in phased array antenna 141 is 7.2 cm (centimeter), and antenna elements 1410 are evenly distributed in both the X and Y polarization directions. Multiple antenna elements 1410 in phased array antenna 141 are respectively connected to multiple RF chains 142 to form multiple channels.

[0023] A near-field calibration device 100 for a phased array antenna system according to an embodiment of the present application may include a vector network analyzer 110 , a positioning device 120 , and a calibration antenna 130 .

[0024] The calibration antenna 130 is fixed to the positioning device 120, and the positioning device 120 can be used to selectively align the calibration antenna 130 with one of the antenna units 1410, such as antenna unit 1410a, in the phased array antenna 141. The calibration antenna 130 can be, for example, a circularly polarized antenna.

[0025] The positioning device 120 of the present application can be used to fix the calibration antenna 130, and can also be used to achieve precise alignment between the calibration antenna 130 and one of the antenna units 1410 in the phased array antenna 141, thereby making the calibration process simpler and faster.

[0026] Positioning device 120 can be made of a material with good wave-transmission properties, thereby reducing electromagnetic interference between calibration antenna 130 and phased array antenna 141 under test. As an example, to reduce interference with calibration antenna 130, positioning device 120 in this application can be made of polyethylene with good wave-transmission properties. The dimensions of positioning device 120 are 18 × 11 × 5.9 cm. It is understood that positioning device 120 can be designed accordingly based on the type of phased array antenna 141.

[0027] In some embodiments, positioning device 120 has a first side and a second side that are opposite to each other. Calibration antenna 130 can be fixed to the first side of positioning device 120, and one of multiple antenna units 1410 can be positioned on the second side of positioning device 120. Calibration antenna 130 is vertically positioned above the array plane of phased array antenna 141, with the radiation direction of calibration antenna 130 perpendicular to the array plane of phased array antenna 141. The energy radiated in the near field by calibration antenna 130 remains consistent with respect to each channel of each phased array antenna 141 to be measured, allowing accurate measurement of the amplitude and phase information of each channel.

[0028] The vector network analyzer 110 has a first port 111 and a second port 112. The first port 111 may include one of a transmit port and a receive port, and the second port 112 may include the other of the transmit port and the receive port. The first port 111 of the vector network analyzer 110 is connected to the calibration antenna 130. For example, the first port 111 of the vector network analyzer 110 may be connected to the calibration antenna 130 via an RF cable. The second port 112 of the vector network analyzer 110 may be connected to the RF link 142a where the antenna unit 1410a aligned with the calibration antenna 130 is located.

[0029] In this application, the port connecting the vector network analyzer 110 to the calibration antenna 130 is referred to as the first port 111, and the port connecting the vector network analyzer 110 to the RF link 142 connected to the phased array antenna 141 is referred to as the second port 112. Therefore, when the phased array antenna 141 serves as a receiving antenna, the first port 111 of the vector network analyzer 110 described in this application is a transmitting port, while the second port 112 is a receiving port; when the phased array antenna 141 serves as a transmitting antenna, the second port 112 of the vector network analyzer 110 described in this application is a transmitting port, while the first port 111 is a receiving port.

[0030] Based on the operating frequency and gain of the phased array antenna 141 to be tested and the RF link 142 connected to it, the calibration frequency range, power, intermediate frequency bandwidth, and other operating parameters can be set appropriately to complete parameter setting and calibration of the vector network analyzer 110. As an example, the calibration frequency range is 1.1-1.6 GHz (gigahertz), the power of the vector network analyzer 110 is set to -50 dBm (decibel milliwatts), the intermediate frequency bandwidth is 1 kHz (kilohertz), and the scanning point is 801.

[0031] In some embodiments, the phased array antenna system near-field calibration device 100 of the present application may further include a power supply control module 150. The power supply control module 150 is connected to each RF link 142 and can be used to control the activation of multiple RF links 142 connected to the phased array antenna 141.

[0032] In some embodiments, one of the multiple antenna units 1410 can be used as a reference antenna unit 1410. By moving the positioning device 120, the calibration antenna 130 can be aligned sequentially with the reference antenna unit 1410 and the remaining antenna units 1410 in the phased array antenna 141. Signals are transmitted and received sequentially via the vector network analyzer 110. The vector network analyzer 110 can also sequentially read the amplitude and phase information of the reference channel where the reference antenna unit 1410 resides and the channels where the remaining antenna units 1410 reside. Furthermore, the individual channels of the phased array antenna system 140 can be calibrated based on the amplitude and phase information of the reference channel and the remaining channels.

[0033] It is understood that the phased array antenna 141 and calibration antenna 130 of the present application can serve as both transmitting and receiving antennas. Specifically, when the phased array antenna 141 serves as a transmitting antenna, the calibration antenna 130 serves as a receiving antenna; correspondingly, when the phased array antenna 141 serves as a receiving antenna, the calibration antenna 130 serves as a transmitting antenna.

[0034] In some embodiments, the calibration apparatus 100 of the present application may further include a data acquisition and storage device 160. The data acquisition and storage device 160 is connected to the vector network analyzer 110. The data acquisition and storage device 160 may be used to control the vector network analyzer 110 and store the amplitude and phase information of the reference channel, as well as the amplitude and phase information of each channel relative to the reference channel.

[0035] In some embodiments, since the gain of the phased array antenna 141 and the RF link 142 is relatively large, the phased array antenna system near-field calibration device 100 of the present application may further include an attenuator (not shown), which is located between the first port 111 of the vector network analyzer 110 and the calibration antenna 130.

[0036] In some embodiments, the vector network analyzer 110 of the present application is equipped with a time domain reflectometry (TDR) option. This, combined with the frequency and time domain capabilities of the vector network analyzer 110, can help reduce multipath effects, reflections, and scattering between the calibration antenna 130 and the antenna elements 1410 of the phased array antenna 141 under test. As an example, using a vector network analyzer equipped with the TDR option, the electrical delay at the center frequency of the reference channel of the reference antenna element of this example phased array antenna is 104.825 nanoseconds (ns), with a time threshold set between -5 ns and 5 ns.

[0037] The calibration antenna 130 of the present application can sequentially scan the antenna units 1410 in the phased array antenna 141 through the positioning device 120. By using a vector network analyzer 110 with a time domain reflectometer option and combining the frequency domain and time domain functions of the vector network analyzer 110, the amplitude and phase information test of each channel of the phased array antenna system 140 can be completed accurately and stably.

[0038] The positioning device 120 of the present application has the advantages of miniaturization, low cost, simple structure, and low interference.

[0039] The near-field calibration device 100 of the phased array antenna system of the present application has low complexity, and the calibration work does not need to be carried out in a microwave darkroom of the corresponding frequency band. The calibration test can be carried out in an open space, which reduces the difficulty of calibration and improves the accuracy and flexibility of calibration.

[0040] The present application also provides a near-field calibration method for a phased array antenna system. Figure 2 A flow chart of a near-field calibration method for a phased array antenna system according to an embodiment of the present application is disclosed. Figure 2 As shown, a near-field calibration method for a phased array antenna system according to an embodiment of the present application may include steps S1 to S5.

[0041] In step S1 , the calibration antenna 130 is fixed on the positioning device 120 .

[0042] In step S2 , the calibration antenna 130 is aligned with each antenna unit 1410 in the phased array antenna 141 in sequence by moving the positioning device 120 .

[0043] In step S3, the first port 111 of the vector network analyzer 110 is fixedly connected to the calibration antenna 130, and the second port 112 of the vector network analyzer 110 is sequentially connected to the radio frequency links 1420 where the antenna units 1410 aligned with the calibration antenna 130 are located. The first port 111 includes one of a transmitting port and a receiving port, and the second port 112 includes the other of the transmitting port and the receiving port.

[0044] In step S4 , signals are transmitted and received in sequence through the transmitting port and receiving port of the vector network analyzer 110 , and amplitude and phase information of each channel are acquired in sequence.

[0045] For example, when the phased array antenna 141 serves as a receiving antenna, the calibration antenna 130 serves as a transmitting antenna. In this case, a signal can be transmitted through the first port 111 of the vector network analyzer 110 and a signal can be received through the second port 112 of the vector network analyzer 110. Conversely, when the phased array antenna 141 serves as a transmitting antenna, the calibration antenna 130 serves as a receiving antenna. In this case, a signal can be transmitted through the second port 112 of the vector network analyzer 110 and a signal can be received through the first port 111 of the vector network analyzer 110.

[0046] In step S5 , each channel of the phased array antenna system 140 is calibrated according to the amplitude and phase information of each channel.

[0047] In some embodiments, step S5 of calibrating each channel of the phased array antenna system 140 according to the amplitude and phase information of each channel may further include steps S51 and S52.

[0048] In step S51 , one antenna unit 1410 is selected as a reference antenna unit 1410 .

[0049] In step S52 , each channel of the phased array antenna system 140 is calibrated according to the amplitude and phase information of the reference channel where the reference antenna unit 1410 is located and the amplitude and phase information of each channel relative to the reference channel.

[0050] In some embodiments, step S52 of calibrating each channel of the phased array antenna system 140 according to the amplitude and phase information of the reference channel where the reference antenna unit 1410 is located and the amplitude and phase information of each channel relative to the reference channel may further include steps S521 to S522.

[0051] In step S521 , the compensated amplitude and phase information of the reference channel is determined when the amplitude and phase information of a predetermined frequency point (eg, the center frequency point) of the reference channel is compensated to 0 dB / 0°.

[0052] In step S522, each channel of the phased array antenna system is calibrated according to the compensated amplitude and phase information of the reference channel and the amplitude and phase information of each channel relative to the reference channel.

[0053] In some embodiments, the phased array antenna system near-field calibration method of the present application may further include step S6.

[0054] In step S6 , the power supply control module 150 may be used to control each RF link 142 connected to each antenna unit 1410 in the phased array antenna 141 to be turned on.

[0055] In some embodiments, the phased array antenna system near-field calibration method of the present application may further include step S7.

[0056] In step S7 , the parameters of the vector network analyzer 110 may be set and calibrated according to the operating frequency and gain of the phased array antenna 141 and the radio frequency link 142 connected to each antenna unit 1410 of the phased array antenna 141 .

[0057] Figure 3 The specific steps of the near-field calibration method of a phased array antenna system according to an embodiment of the present application are disclosed. Figure 3As shown, in step S301, according to the operating frequency and gain of the phased array antenna 141 and the RF link 142 to be tested, the appropriate calibration frequency range, power, intermediate frequency bandwidth and other operating parameters are set to complete the parameter setting of the vector network analyzer 110 and the calibration in this state; in step S302, the power supply control module 150 controls the opening of each RF link 142 connected to the phased array antenna 141; in step S303, the calibration antenna 130 is aligned with an antenna unit 1410 in the phased array antenna 141 (the antenna unit 1410 serves as the reference antenna unit 1410) through the positioning device 120, and the first port 111 of the vector network analyzer 110 is connected to the calibration antenna 130 through an RF cable, and the second port 112 is connected to the RF link 1420 cascaded with the reference antenna unit 1410. For example, the calibration antenna 130 serves as a transmitting antenna and the phased array antenna 141 serves as a receiving antenna. The vector network analyzer 110 can be controlled by the data acquisition and storage device 160. The analyzer 110 transmits a signal via the calibration antenna 130 and receives the signal via the reference antenna unit 1410 in the phased array antenna 141. The analyzer obtains the electrical delay at the predetermined frequency of the reference channel where the reference antenna unit 1410 of the test phased array antenna 141 resides and sets an appropriate time threshold. The analyzer determines the compensated amplitude and phase information of the reference channel when the amplitude and phase of the predetermined frequency of the reference channel to be tested, as read by the vector network analyzer 110, are compensated to 0 dB / 0°, and stores the compensated amplitude and phase information. In step S304, the calibration antenna 130, fixed to the positioning device 120, is aligned with one of the remaining antenna units 1410 in the phased array antenna 141 by moving the positioning device 120. The vector network analyzer is then controlled to transmit and receive signals via the data acquisition and storage device 160, and the amplitude and phase information of the remaining channels relative to the reference channel is acquired and stored. In step S305, a determination is made as to whether the acquisition and storage of the amplitude and phase information for all remaining channels has been completed. If the determination is "yes," the process proceeds to step S306. Otherwise, the process returns to step S304. In step S306, the amplitude and phase of each channel of the phased array antenna system 140 are calibrated based on the compensated amplitude and phase information of the reference channel and the amplitude and phase information of each channel relative to the reference channel, so that each channel is balanced, thereby completing the calibration of the phased array antenna system 140.

[0058] The phased array antenna system near-field calibration device 100 and method thereof according to one or more embodiments of the present application may have at least the following beneficial technical effects: (1) This application designs a positioning device 120 that can quickly align the calibration antenna 130 with one of the antenna units 1410 in the phased array antenna 141, thereby quickly completing the near-field calibration of the feasible phased array antenna system 140; (2) This application effectively reduces the complexity of the calibration system and the requirements for the environment, improves the calibration accuracy of each channel of the phased array system 140, and helps optimize the radiation pattern of the phased array antenna 141 and improve the system performance; (3) This application improves the feasibility of phased array antenna system calibration and expands its application scope.

[0059] The above is a detailed introduction to the near-field calibration device and method of the phased array antenna system provided in the embodiment of the present application. This article uses specific examples to illustrate the near-field calibration device and method of the phased array antenna system in the embodiment of the present application. The description of the above embodiment is only used to help understand the core idea of ​​the present application and is not intended to limit the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the spirit and principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications should also fall within the scope of protection of the claims attached to the present application.

Claims

1. A near-field calibration device for a phased array antenna system, wherein the phased array antenna system comprises a phased array antenna and multiple radio frequency links, wherein the phased array antenna comprises multiple antenna units, and the multiple antenna units are respectively connected to the multiple radio frequency links to form multiple channels, characterized in that: The calibration device includes a vector network analyzer, a positioning device and a calibration antenna, wherein: The calibration antenna is fixed on the positioning device, and the positioning device is used to selectively align the calibration antenna with one of the antenna units in the phased array antenna; The vector network analyzer has a first port and a second port, the first port is connected to the calibration antenna, and the second port is used to connect to the radio frequency link where the antenna unit aligned with the calibration antenna is located, the first port includes one of the transmitting port and the receiving port, and the second port includes the other of the transmitting port and the receiving port.

2. The near-field calibration device for a phased array antenna system according to claim 1, wherein: The positioning device has a first side and a second side opposite to each other, the calibration antenna is fixed to the first side of the positioning device, and one of the plurality of antenna units is positionable on the second side of the positioning device.

3. The near-field calibration device for a phased array antenna system according to claim 2, wherein: The calibration antenna is vertically arranged above the array plane of the phased array antenna, and the radiation direction of the calibration antenna is vertically toward the array plane of the phased array antenna.

4. The near-field calibration device for a phased array antenna system according to any one of claims 1 to 3, wherein: Also includes: A power supply control module is used to control the opening of the plurality of radio frequency links connected to the phased array antenna.

5. The near-field calibration device for a phased array antenna system according to any one of claims 1 to 3, wherein: One of the multiple antenna units is used as a reference antenna unit, and the vector network analyzer is used to read the amplitude and phase information of the reference channel where the reference antenna unit is located and the channels where the remaining antenna units are located. The calibration device also includes: A data acquisition and storage device is used to control the vector network analyzer and save the amplitude and phase information of the reference channel and the amplitude and phase information of each channel relative to the reference channel.

6. The near-field calibration device for a phased array antenna system according to any one of claims 1 to 3, wherein: The vector network analyzer is configured with a time domain reflectometer option.

7. A near-field calibration method for a phased array antenna system, wherein the phased array antenna system comprises a phased array antenna and multiple radio frequency links, wherein the phased array antenna comprises multiple antenna units, and the multiple antenna units are respectively connected to the multiple radio frequency links to form multiple channels, characterized in that: include: Fix the calibration antenna on the positioning device; By moving the positioning device, the calibration antenna is aligned with each antenna unit in the phased array antenna in sequence; Fixedly connecting a first port of a vector network analyzer to the calibration antenna and sequentially connecting a second port of the vector network analyzer to radio frequency links of antenna units aligned with the calibration antenna, wherein the first port includes one of a transmitting port and a receiving port, and the second port includes the other of the transmitting port and the receiving port; Transmitting and receiving signals in sequence through the transmitting port and receiving port of the vector network analyzer, and obtaining amplitude and phase information of each of the channels in sequence; Each channel of the phased array antenna system is calibrated according to the amplitude and phase information of each channel.

8. The near-field calibration method for a phased array antenna system according to claim 7, wherein: The calibrating each channel of the phased array antenna system according to the amplitude and phase information of each channel includes: selecting one of the antenna units as a reference antenna unit; Each channel of the phased array antenna system is calibrated according to the amplitude and phase information of the reference channel where the reference antenna unit is located and the amplitude and phase information of each channel relative to the reference channel.

9. The near-field calibration method for a phased array antenna system according to claim 8, wherein: The calibrating each channel of the phased array antenna system according to the amplitude and phase information of the reference channel where the reference antenna unit is located and the amplitude and phase information of each channel relative to the reference channel includes: Determining the compensated amplitude and phase information of the reference channel when the amplitude and phase information of the predetermined frequency point of the reference channel are compensated to 0 dB / 0°; Each channel of the phased array antenna system is calibrated according to the compensated amplitude and phase information of the reference channel and the amplitude and phase information of each channel relative to the reference channel.

10. The near-field calibration method for a phased array antenna system according to any one of claims 7 to 9, wherein: The method further comprises: The power supply control module is used to control the opening of each radio frequency link connected to each antenna unit in the phased array antenna.

11. The near-field calibration method for a phased array antenna system according to any one of claims 7 to 9, wherein: The method further comprises: The parameters of the vector network analyzer are set and calibrated according to the operating frequency and gain of the phased array antenna and the radio frequency link connected to each antenna unit of the phased array antenna.

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