Phased array antenna system near-field calibration apparatus and method

Abstract

The application provides a near-field calibration device and method for a phased array antenna system. The phased array antenna system includes a phased array antenna and a plurality of radio frequency links. The phased array antenna includes a plurality of antenna elements. The plurality of antenna elements are respectively connected to the plurality of radio frequency links to form a plurality of channels. The calibration device includes a vector network analyzer, a positioning device, and a calibration antenna. The calibration antenna is fixed on the positioning device. The positioning device is used to selectively align the calibration antenna with one of the antenna elements 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. The second port is used to connect to the radio frequency link in which the antenna element aligned with the calibration antenna is located. The first port includes one of a transmitting port and a receiving port. The second port includes the other one of the transmitting port and the receiving port. The application can simplify the calibration process and improve the calibration accuracy.

Description

TECHNICAL FIELD

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

[0002] An active phased array antenna is composed of a large number of antenna elements arranged in a certain rule, and the amplitude and phase of each antenna element can be independently controlled. Due to its flexibility and multi-beam capability, it has attracted much attention and provided significant advantages for phased array radar, mobile communication and radio astronomy. With the development of semiconductor technology and the design of antenna miniaturization, the number of elements in the phased array is also greatly increased. RF synchronization between element channels is a key technology for phased array system application, and phase and amplitude errors are inevitably introduced in the integration process of large-scale phased array system due to components, manufacturing and assembly, etc. In the production and debugging stage, the phased array system should be calibrated to compensate for potential errors before actual operation, so as to achieve the best performance of the phased array system and realize the required beam pattern, accurate control of sidelobe level and overall system performance. Calibration of large-scale phased array antenna system is one of the key technologies to ensure the normal operation of phased array antenna system.

[0003] Common phased array antenna calibration techniques mainly include: near-field calibration technique, peripheral fixed probe calibration technique, far-field calibration technique, built-in coupling network calibration technique, mutual coupling calibration technique, etc. The traditional near-field scanning probe method relies on a precise automated mechanical positioning system and is usually carried out in a microwave darkroom; the peripheral fixed probe method requires complex hardware and algorithms; in the far-field calibration method, the erection of the probe antenna in the far-field region is often a big problem; the built-in coupling network calibration technique needs to consider additional circuit hardware at the beginning of the design, and the inconsistency introduced by the coupling power division network will also affect the calibration effect; the mutual coupling calibration technique is only suitable for phased array systems that can independently control the working mode of each receiving / transmitting unit. These methods not only increase the hardware cost and system complexity, but also have high requirements for the test environment and high cost of calibration facilities, making the development and implementation of calibration technology more time-consuming and challenging. SUMMARY

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

[0005] One aspect of this application provides a near-field calibration apparatus for a phased array antenna system. The phased array antenna system includes a phased array antenna and multiple radio frequency (RF) links. The phased array antenna includes multiple antenna elements, each of which is connected to one of the RF links to form multiple channels. The calibration apparatus includes a vector network analyzer, a positioning device, and a calibration antenna. The calibration antenna is fixed to the positioning device, which is used to selectively align the calibration antenna with one of the antenna elements 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 RF link containing the antenna element aligned with the calibration antenna. The first port includes one of a transmit port and a receive port, and the second port includes the other of the transmit port and the receive port.

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

[0007] Furthermore, the calibration antenna is vertically positioned above the phased array antenna array surface, and the radiation direction of the calibration antenna is perpendicular to the phased array antenna array surface.

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

[0009] Furthermore, one of the multiple antenna elements serves as a reference antenna element. The vector network analyzer is used to read the amplitude and phase information of the reference channel where the reference antenna element is located and the channels where the other antenna elements are located. The calibration device further includes a data acquisition and storage device for controlling the vector network analyzer and saving 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 equipped with a time-domain reflectometer option.

[0011] Another aspect of the present application provides a phased array antenna system near-field calibration method. The phased array antenna system includes a phased array antenna and a plurality of radio frequency links, the phased array antenna includes a plurality of antenna elements, and the plurality of antenna elements are respectively connected to the plurality of radio frequency links to form a plurality of channels. The method includes: fixing a calibration antenna on a positioning device; aligning the calibration antenna with each antenna element in the phased array antenna in turn by moving the positioning device; fixedly connecting a first port of a vector network analyzer with the calibration antenna and connecting a second port of the vector network analyzer with a radio frequency link in which each antenna element aligned with the calibration antenna is located in turn, 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 through the transmitting port and the receiving port of the vector network analyzer in turn, and acquiring amplitude and phase information of each channel in turn; and calibrating each channel of the phased array antenna system according to the amplitude and phase information of each channel.

[0012] Further, the calibration of each channel of the phased array antenna system according to the amplitude and phase information of each channel includes: selecting one of the antenna elements as a reference antenna element; and calibrating each channel of the phased array antenna system according to amplitude and phase information of a reference channel in which the reference antenna element is located and amplitude and phase information of each channel relative to the reference channel.

[0013] Further, the calibration of each channel of the phased array antenna system according to the amplitude and phase information of each channel includes: determining amplitude and phase information of the reference channel after compensation of a predetermined frequency point of the reference channel to 0 dB / 0°; and calibrating each channel of the phased array antenna system according to the amplitude and phase information of the reference channel after compensation and amplitude and phase information of each channel relative to the reference channel.

[0014] Further, the method further includes: controlling each radio frequency link connected to each antenna element in the phased array antenna to be turned on by a power supply control module.

[0015] Further, the method further includes: performing parameter setting and calibration of the vector network analyzer according to operating frequencies and gains of the phased array antenna and the radio frequency links connected to each antenna element of the phased array antenna.

[0016] The phased array antenna system near-field calibration device and method of one or more embodiments of the present application can have at least the following beneficial technical effects:

[0017] (1) The application can quickly realize the alignment of one of the calibration antennas and the phased array antenna units, thereby quickly completing the near-field calibration of the feasible phased array antenna system;

[0018] (2) The 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 to optimize the phased array antenna pattern and improve the system performance;

[0019] (3) The application improves the feasibility of the phased array antenna system calibration work, and expands its application range. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The structure diagram of the near-field calibration device of the phased array antenna system of an embodiment of the application.

[0021] Figure 2 The flow chart of the near-field calibration method of the phased array antenna system of an embodiment of the application.

[0022] Figure 3 The specific step diagram of the near-field calibration method of the phased array antenna system of an embodiment of the application. DETAILED DESCRIPTION

[0023] The exemplary embodiments will be described in detail herein with reference to the attached drawings. The following description is only one of the embodiments in accordance with the present application. Rather, they are merely examples of apparatuses in accordance with some aspects of the present application as detailed in the appended claims.

[0024] 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. The features in the following embodiments and implementation manners can be combined with each other without conflict.

[0025] The application provides a near-field calibration device of a phased array antenna system. Figure 1 The structure diagram of the near-field calibration device of the phased array antenna system of an embodiment of the application is disclosed. As shown in Figure 1As shown, the phased array antenna system 140 includes a phased array antenna 141 and a plurality of radio frequency links 142. The phased array antenna 141 includes a plurality of antenna elements 1410. As an example, the spacing between the antenna elements 1410 in the phased array antenna 141 is 7.2 cm (centimeters), and the antenna elements 1410 are uniformly distributed in both X and Y polarization directions. The plurality of antenna elements 1410 in the phased array antenna 141 are respectively connected to the plurality of radio frequency links 142 to form a plurality of channels.

[0026] The near-field calibration device 100 of the phased array antenna system of one embodiment of the present application can include a vector network analyzer 110, a positioning device 120, and a calibration antenna 130.

[0027] The calibration antenna 130 is fixed on the positioning device 120, which can be used to selectively align the calibration antenna 130 with one of the antenna elements 1410 in the phased array antenna 141, such as the antenna element 1410a. The calibration antenna 130 can be, for example, a circularly polarized antenna.

[0028] The positioning device 120 of the present application can be used to both fix the calibration antenna 130 and achieve accurate alignment of the calibration antenna 130 with one of the antenna elements 1410 in the phased array antenna 141, thereby making the calibration process more convenient and fast.

[0029] The positioning device 120 can be made of a material with good wave-penetrating effect, which can reduce electromagnetic wave interference between the calibration antenna 130 and the phased array antenna 141 to be measured. As an example, considering the reduction of interference to the calibration antenna 130, the positioning device 120 of the present application can be made of a polyethylene material with good wave-penetrating effect, and the size of the positioning device 120 is 18 x 11 x 5.9 cm. Of course, it can be understood that the positioning device 120 can be designed according to the actual type of the phased array antenna 141.

[0030] In some embodiments, the positioning device 120 has opposite first and second sides. The calibration antenna 130 can be fixed on the first side of the positioning device 120, and one of the plurality of antenna elements 1410 can be positioned on the second side of the positioning device 120. The calibration antenna 130 is vertically arranged above the array surface of the phased array antenna 141, and the radiation direction of the calibration antenna 130 is vertically oriented towards the array surface of the phased array antenna 141. The energy of the near-field radiation of the calibration antenna 130 remains consistent with respect to each channel in which the phased array antenna 141 to be measured is located, and the amplitude and phase information of each channel can be accurately measured.

[0031] The vector network analyzer 110 has a first port 111 and a second port 112. The first port 111 can include one of a transmitting port and a receiving port, and the second port 112 can include the other one of the transmitting port and the receiving 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 can be connected to the calibration antenna 130 through a radio frequency cable. The second port 112 of the vector network analyzer 110 can be used to connect to the radio frequency link 142a in which the antenna element 1410a aligned with the calibration antenna 130 is located.

[0032] In the present application, the port of the vector network analyzer 110 connected to the calibration antenna 130 is referred to as the first port 111, and the port of the vector network analyzer 110 used to connect to the radio frequency link 142 connected to the phased array antenna 141 is referred to as the second port 112. Therefore, when the phased array antenna 141 is used as a receiving antenna, the first port 111 of the vector network analyzer 110 described in the present application is a transmitting port, and the second port 112 is a receiving port; when the phased array antenna 141 is used as a transmitting antenna, the second port 112 of the vector network analyzer 110 described in the present application is a transmitting port, and the first port 111 is a receiving port.

[0033] The parameter settings of the vector network analyzer 110 and its calibration can be completed according to the working frequency and gain of the phased array antenna 141 to be measured and the radio frequency link 142 connected to the phased array antenna 141, and by setting appropriate calibration frequency range, power, intermediate frequency bandwidth and other working parameters. As an example, the calibration frequency range is 1.1-1.6 GHz, the power of the vector network analyzer 110 is set to -50 dBm, the intermediate frequency bandwidth is 1 KHz, and the scanning point is 801.

[0034] In some embodiments, the phased array antenna system near-field calibration device 100 of the present application can further include a power supply control module 150. The power supply control module 150 is connected to each radio frequency link 142, and the power supply control module 150 can be used to control the opening of the plurality of radio frequency links 142 connected to the phased array antenna 141.

[0035] In some embodiments, one of the plurality of antenna elements 1410 can be used as a reference antenna element 1410. By moving the positioning device 120, the calibration antenna 130 can be aligned with the reference antenna element 1410 and the remaining antenna elements 1410 in the phased array antenna 141 one by one. The vector network analyzer 110 can transmit and receive signals one by one, and the vector network analyzer 110 can read the amplitude and phase information of the reference channel where the reference antenna element 1410 is located and the channels where the remaining antenna elements 1410 are located one by one. Then, the channels of the phased array antenna system 140 can be calibrated according to the amplitude and phase information of the reference channel and the remaining channels.

[0036] It can be understood that the phased array antenna 141 and the calibration antenna 130 of the present application can be used as both transmitting antennas and receiving antennas. When the phased array antenna 141 is a transmitting antenna, the calibration antenna 130 is a receiving antenna; correspondingly, when the phased array antenna 141 is a receiving antenna, the calibration antenna 130 is a transmitting antenna.

[0037] In some embodiments, the calibration device 100 of the present application can 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 can be used to control the vector network analyzer 110, and can save the amplitude and phase information of the reference channel, and the amplitude and phase information of each channel relative to the reference channel.

[0038] In some embodiments, because the gain of the phased array antenna 141 and the radio frequency link 142 is large, the near-field calibration device 100 of the phased array antenna system of the present application can further include an attenuator (not shown) between the first port 111 of the vector network analyzer 110 and the calibration antenna 130.

[0039] In some embodiments, the vector network analyzer 110 of the present application is configured with a Time Domain Reflectometry (TDR) option. Combining the frequency domain and time domain functions of the vector network analyzer 110 can help reduce the multipath effect, reflection 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 configured with a time domain reflectometry option, the electrical delay of the center frequency point of the reference channel of the reference antenna element of the example phased array antenna is 104.825 ns (nanoseconds), and the time threshold is set to -5 ns ~ 5 ns.

[0040] The calibration antenna 130 of the application can scan each antenna unit 1410 in the phased array antenna 141 in turn through the positioning device 120, and the amplitude and phase information test of each channel of the phased array antenna system 140 can be accurately and stably completed by using the vector network analyzer 110 with a time domain reflectometer option in combination with the frequency domain and time domain functions of the vector network analyzer 110.

[0041] The positioning device 120 of the application has the advantages of miniaturization, low cost, simple structure, low interference, etc.

[0042] The phased array antenna system near-field calibration device 100 of the application has low complexity, and the calibration work does not need to be carried out in a microwave anechoic chamber of a corresponding frequency band, but can be carried out in an open space, thereby reducing the difficulty of calibration and improving the accuracy and flexibility of calibration.

[0043] The application also provides a phased array antenna system near-field calibration method. Figure 2 A flowchart of the phased array antenna system near-field calibration method of one embodiment of the application is disclosed. As shown in the flowchart, the phased array antenna system near-field calibration method of one embodiment of the application can include steps S1 to S5. Figure 2

[0044] In step S1, the calibration antenna 130 is fixed on the positioning device 120.

[0045] In step S2, the calibration antenna 130 is aligned with each antenna unit 1410 in the phased array antenna 141 in turn by moving the positioning device 120.

[0046] In step S3, the first port 111 of the vector network analyzer 110 is fixedly connected with the calibration antenna 130, and the second port 112 of the vector network analyzer 110 is connected with the radio frequency link 1420 where each antenna unit 1410 aligned with the calibration antenna 130 is located in turn. The first port 111 includes one of a transmitting port and a receiving port, and the second port 112 includes the other one of the transmitting port and the receiving port.

[0047] In step S4, signals are transmitted and received in turn through the transmitting port and the receiving port of the vector network analyzer 110, and the amplitude and phase information of each channel are acquired in turn.

[0048] ​For example, when the phased array antenna 141 is used as a receiving antenna, the calibration antenna 130 is used as a transmitting antenna, at this time, the signal can be transmitted through the first port 111 of the vector network analyzer 110 and received through the second port 112 of the vector network analyzer 110; conversely, when the phased array antenna 141 is used as a transmitting antenna, the calibration antenna 130 is used as a receiving antenna, at this time, the signal can be transmitted through the second port 112 of the vector network analyzer 110 and received through the first port 111 of the vector network analyzer 110.

[0049] In step S5, each channel of the phased array antenna system 140 is calibrated according to the amplitude and phase information of each channel.

[0050] In some embodiments, the calibration of each channel of the phased array antenna system 140 according to the amplitude and phase information of each channel in step S5 can further include steps S51 to S52.

[0051] In step S51, one antenna unit 1410 is selected as a reference antenna unit 1410.

[0052] 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 in which the reference antenna unit 1410 is located and the amplitude and phase information of each channel relative to the reference channel.

[0053] In some embodiments, the calibration of each channel of the phased array antenna system 140 according to the amplitude and phase information of the reference channel in which the reference antenna unit 1410 is located and the amplitude and phase information of each channel relative to the reference channel in step S52 can further include steps S521 to S522.

[0054] In step S521, the amplitude and phase information of the reference channel at a predetermined frequency point (e.g. a center frequency point) is compensated to 0 dB / 0° to obtain the compensated amplitude and phase information of the reference channel.

[0055] 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.

[0056] In some embodiments, the phased array antenna system near-field calibration method of the present application can further include step S6.

[0057] In step S6, each radio frequency link 142 connected to each antenna unit 1410 in the phased array antenna 141 can be turned on by the power supply control module 150.

[0058] In some embodiments, the phased array antenna system near-field calibration method of the present application can further comprise step S7.

[0059] In step S7, the parameter setting of the vector network analyzer 110 and its calibration can be performed according to the operating frequency and gain of the phased array antenna 141 and the radio frequency link 142 connected with each antenna element 1410 of the phased array antenna 141.

[0060] Figure 3 The specific step diagram of the phased array antenna system near-field calibration method of one embodiment of the present application is disclosed. As shown in FIG. 4, the specific step diagram of the phased array antenna system near-field calibration method of one embodiment of the present application comprises steps S1-S7. Figure 3As shown, in step S301, according to the working frequency and gain of the phased array antenna 141 and the radio frequency link 142 to be tested, appropriate calibration frequency range, power, intermediate frequency bandwidth and other working parameters are set, the parameter setting of the vector network analyzer 110 and the calibration in this state are completed; in step S302, each radio frequency link 142 connected with the phased array antenna 141 is turned on by the power supply control module 150; in step S303, the calibration antenna 130 is aligned with one antenna unit 1410 (the antenna unit 1410 as a reference antenna unit 1410) in the phased array antenna 141 by the positioning device 120, the first port 111 of the vector network analyzer 110 is connected with the calibration antenna 130 through the radio frequency cable, and the second port 112 is connected with the radio frequency link 1420 cascaded with the reference antenna unit 1410, for example, the calibration antenna 130 as a transmitting antenna and the phased array antenna 141 as a receiving antenna, the vector network analyzer 110 can be controlled by the data acquisition and storage device 160 to transmit signals through the calibration antenna 130 and receive signals through the reference antenna unit 1410 in the phased array antenna 141, the electrical delay of the reference channel at the predetermined frequency point of the reference antenna unit 1410 of the test phased array antenna 141 is obtained, and an appropriate time threshold is set, the amplitude and phase of the reference channel at the predetermined frequency point of the reference channel to be tested read by the vector network analyzer 110 are compensated to 0 dB / 0°, the amplitude and phase information of the reference channel after compensation are determined, and the amplitude and phase information of the reference channel after compensation are stored; in step S304, the calibration antenna 130 fixed on the positioning device 120 is aligned with one of the remaining antenna units 1410 of the phased array antenna 141 by moving the positioning device 120, the vector network analyzer can be controlled by the data acquisition and storage device 160 to transmit and receive signals, and the amplitude and phase information of the remaining channels relative to the reference channel are collected and stored; in step S305, it is judged whether the collection and storage of the amplitude and phase information of all the remaining channels are completed. When the result of the judgment is “yes”, step S306 is entered. Otherwise, it returns to step S304. In step S306, the amplitude and phase of each channel of the phased array antenna system 140 are calibrated according to the amplitude and phase information of the reference channel after compensation and the amplitude and phase information of each channel relative to the reference channel, so that each channel is balanced, and the calibration work of the phased array antenna system 140 is completed.

[0061] The phased array antenna system near-field calibration device 100 and the method thereof of one or more embodiments of the present application can have at least the following beneficial technical effects:

[0062] (1) The application can quickly realize the alignment of the calibration antenna 130 and one of the antenna units 1410 in the phased array antenna 141, thereby quickly completing the near-field calibration work of the feasible phased array antenna system 140;

[0063] (2) The application effectively reduces the complexity and requirements of the calibration system, improves the calibration accuracy of each channel of the phased array system 140, and helps to optimize the phased array antenna 141 pattern and improve the system performance;

[0064] (3) The application improves the feasibility of the phased array antenna system calibration work and expands its application range.

[0065] The above describes the phased array antenna system near-field calibration device and method provided by the embodiments of the application in detail. This article applies specific examples to describe the phased array antenna system near-field calibration device and method provided by the embodiments of the application. The above description of the embodiments is only used to help understand the core idea of the application and does not limit the application. It should be noted that for those skilled in the art, without departing from the spirit and principles of the application, some improvements and modifications can be made to the application, and these improvements and modifications should also fall within the protection scope of the appended claims of the application.

Claims

1. A near-field calibration device for a phased array antenna system, wherein the phased array antenna system includes a phased array antenna and multiple radio frequency links, the phased array antenna includes multiple antenna elements, and the multiple antenna elements are respectively connected to the multiple radio frequency links to form multiple channels, characterized in that, The calibration device comprises a vector network analyzer, a positioning device and a calibration antenna, wherein, the calibration antenna is fixed on the positioning device, the positioning device is used to selectively align the calibration antenna with one of the antenna units in the phased array antenna, the positioning device is made of a wave-transparent material, the positioning device has opposite first and second sides, one of the antenna units in the plurality of antenna units is positioned on the second side of the positioning device, and the calibration antenna is fixed on the first side of the positioning device; the vector network analyzer is configured with a time domain reflectometer option, the vector network analyzer has a first port and a second port, the first port is connected with the calibration antenna, the second port is used to connect with a radio frequency link in which the antenna unit aligned with the calibration antenna is located, the first port comprises one of a transmitting port and a receiving port, and the second port comprises the other one of the transmitting port and the receiving port.

2. The phased array antenna system near-field calibration apparatus of claim 1, 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 towards the array plane of the phased array antenna.

3. The phased array antenna system near-field calibration apparatus of claim 1 or 2, wherein, Further comprising: a power supply control module for controlling the opening of the plurality of radio frequency links connected with the phased array antenna.

4. The phased array antenna system near-field calibration apparatus of claim 1 or 2, wherein, One of the antenna units in the plurality of antenna units is used as a reference antenna unit, the vector network analyzer is used to read the amplitude and phase information of a reference channel in which the reference antenna unit is located and channels in which the remaining antenna units are located, and the calibration device further comprises: a data acquisition and storage device for controlling the vector network analyzer and saving the amplitude and phase information of the reference channel and the amplitude and phase information of each channel relative to the reference channel. 5.A method for near-field calibration of a phased array antenna system, the phased array antenna system comprising a phased array antenna and a plurality of radio frequency (RF) links, the phased array antenna comprising a plurality of antenna elements, the plurality of antenna elements being respectively connected to the plurality of RF links to form a plurality of channels, the method comprising: transmitting a first signal from a first channel of the plurality of channels; receiving a second signal from a second channel of the plurality of channels; and determining a phase difference between the first signal and the second signal. including: fixing the calibration antenna on the positioning device, the positioning device is made of a wave-transparent material, the positioning device has opposite first and second sides, the calibration antenna is fixed on the first side of the positioning device, and one of the antenna units in the plurality of antenna units is positioned on the second side of the positioning device; aligning the calibration antenna with each antenna unit in the phased array antenna in turn by moving the positioning device; fixedly connecting a first port of a vector network analyzer configured with a time domain reflectometer option with the calibration antenna and sequentially connecting a second port of the vector network analyzer with a radio frequency link in which each antenna unit aligned with the calibration antenna is located, wherein the first port comprises one of a transmitting port and a receiving port, and the second port comprises the other one 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 acquiring the amplitude and phase information of each channel; calibrating each channel of the phased array antenna system according to the amplitude and phase information of each channel.

6. The phased array antenna system near-field calibration method of claim 5, wherein, The calibration of each channel of the phased array antenna system according to the amplitude and phase information of each channel comprises: Selecting one of the antenna units as a reference antenna unit; Calibrating each channel of the phased array antenna system according to amplitude and phase information of a reference channel in which the reference antenna unit is located and amplitude and phase information of each channel relative to the reference channel.

7. The phased array antenna system near-field calibration method of claim 6, wherein, The calibrating each channel of the phased array antenna system according to amplitude and phase information of a reference channel in which the reference antenna unit is located and amplitude and phase information of each channel relative to the reference channel comprises: Determining amplitude and phase information of the reference channel after compensation to 0dB / 0°; Calibrating each channel of the phased array antenna system according to amplitude and phase information of the reference channel after compensation and amplitude and phase information of each channel relative to the reference channel.

8. The phased array antenna system near-field calibration method of any of claims 5 to 7, wherein, The method further comprises: Controlling each radio frequency link connected with each antenna unit in the phased array antenna to be turned on by a power supply control module.

9. The phased array antenna system near-field calibration method of any of claims 5 to 7, wherein, The method further comprises: According to the working frequency and gain of the phased array antenna and the radio frequency link connected with each antenna unit of the phased array antenna, the parameter setting of the vector network analyzer and its calibration are performed.

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