Two-dimensional phased array digital-analog front-end calibration implementation method and system

Abstract

The invention relates to a two-dimensional phased array digital-analog front-end calibration realization method and system, and the method comprises the steps: calibrating linear arrays of a plurality of channels of a microwave front end through a local oscillator frequency conversion loop, the front end of the local oscillator frequency conversion loop is connected with a frequency conversion module, and the frequency conversion module is connected with the frequency conversion module; the rear end of the antenna is connected with the antenna radiation unit of the microwave front end; a calibration network is utilized to calibrate a plurality of linear arrays, the calibration network comprises a calibration channel and an auxiliary antenna which are connected with each other, and the calibration channel is respectively connected with a frequency conversion module and a digital-analog module. According to the calibration implementation method, the required circuit is simple, the calibration implementation method is suitable for a high-integration-level two-dimensional phased array front-end system, a coupler and a switching network do not need to be additionally arranged on each antenna array element, only one external auxiliary antenna is needed, the complexity and cost of an antenna system are greatly reduced, the calibration accuracy is high, and batch production of products is facilitated; the calibration work complexity is reduced; the method is suitable for direct expansion of array planes.

Description

Technical Field

[0001] The present invention relates to the technical field of phased array calibration, and in particular to a method and system for realizing two-dimensional phased array digital-analog front-end calibration. Background Art

[0002] With the development of modern microwave integration technology, phased array technology is increasingly widely used in radar, electronic countermeasures and communication systems due to its advantages such as multi-independent beam capability, flexible and fast control to achieve multi-function, high reliability and conformal application. In terms of circuit form, compared with traditional brick-type components, two-dimensional tile-type transceiver components have higher integration, significantly reduced volume and weight, and are more conducive to the low-cost and miniaturization of the system; at the same time, the introduction of digital beam components ensures the system's accurate beam scanning capability and adaptive beam anti-interference capability.

[0003] At present, the functional flexibility, integration and cost requirements of the two-dimensional phased array microwave system with one-dimensional spatial synthesis and one-dimensional digital beamforming are between the traditional direct spatial synthesis phased array system and the full digital beamforming phased array system. The precise pointing of the phased array beam requires strict and accurate control of the amplitude and phase of each unit antenna, so the calibration and regular calibration of the power and phase of the system are essential. In the related technology, there are two conventional calibration methods: (1) The external calibration method requires the antenna array to obtain or send monitoring signals through one or more external monitoring antennas, collect the changed amplitude and phase information, and obtain data on channel amplitude and phase inconsistency. This method takes into account the influence of factors such as amplitude and phase errors between antenna elements and is closer to the actual amplitude and phase information. For a hybrid digital-analog front-end system, it is necessary to use the system's own auxiliary frequency conversion channel and digital-analog channel to achieve continuous amplitude and phase scanning within the band. Therefore, the external calibration process must select a site that meets specific test conditions to ensure accuracy and stability; usually, an m*n two-dimensional array needs to complete m*n in-band scans and data collection, which is time-consuming and difficult to maintain in working condition.

[0004] (2) Using internal calibration, add a coupler at the end of the link, monitor the signal coupled or fed into the coupler, and measure the amplitude and phase information through the switch matrix and auxiliary channels. Online monitoring can be achieved with fast speed and stable performance, but the error introduced by the internal calibration network needs to be eliminated. Compared with external calibration, it can be used as a diagnostic tool to detect front-end system failures, can work around the clock, and is less affected by the environment.

[0005] Figure 1 This is the implementation form of the calibration network of a conventional two-dimensional phased array system, and each channel uses a switch to increase isolation. However, the introduction of the active calibration network increases the circuit complexity, processing difficulty and cost of the antenna on the one hand; on the other hand, the introduction of the calibration network error will lead to a decrease in calibration accuracy.

[0006] Therefore, it is necessary to improve one or more problems existing in the above-mentioned related technical solutions.

[0007] It should be noted that this section is intended to provide background or context for the technical solutions of the present invention stated in the claims. The description herein is not admitted to be prior art by inclusion in this section. Summary of the invention

[0008] The object of the present invention is to provide a two-dimensional phased array digital-analog front-end calibration implementation method, a preparation method and a superposition plate, thereby at least to a certain extent solving one or more problems caused by the limitations and defects of the relevant technology.

[0009] The present invention first provides a two-dimensional phased array digital-analog front-end calibration implementation method, the method comprising: S100, calibrating the linear arrays of multiple channels of the microwave front end respectively by using a local oscillator frequency conversion loop, wherein the front end of the local oscillator frequency conversion loop is connected to the frequency conversion module, and the rear end is connected to the antenna radiation unit of the microwave front end; S200, calibrating multiple linear arrays using a calibration network, wherein the calibration network includes a calibration channel and an auxiliary antenna connected to each other, and the calibration channel is connected to a frequency conversion module and a digital-analog module respectively.

[0010] Preferably, in S100, the linear array of each channel includes a plurality of antenna radiating units, and when calibrating the linear array of a channel, the calibration of the linear array of the channel is completed by switching the antenna radiating units.

[0011] Preferably, when calibrating the line arrays of different channels, the intermediate frequency signal of the frequency conversion module of the calibrated channel is switched accordingly.

[0012] Preferably, in S200, the calibration channel includes: an auxiliary digital-to-analog channel and an auxiliary frequency conversion channel, the auxiliary digital-to-analog channel is connected to the digital-to-analog module, the auxiliary frequency conversion channel is connected to the frequency conversion module, and the auxiliary frequency conversion channel is also connected to the auxiliary antenna.

[0013] Preferably, in S100, the step of using the local oscillator frequency conversion loop to calibrate the linear arrays of multiple channels of the microwave front end respectively includes: Using a local oscillator frequency conversion loop to calibrate the linear arrays of multiple channels of the microwave front end respectively, and obtain initial amplitude and phase difference data of the microwave front end array; Normalizing the initial amplitude and phase difference data of the microwave front-end array, and retesting and verifying; The spatial synthesis phase code of the microwave front-end array is solidified.

[0014] Preferably, in S200, the step of calibrating the plurality of line arrays using a calibration network includes: Test the initial amplitude and phase between channels of digital-analog modules; Normalize the initial amplitude and phase between channels of the digital-to-analog module.

[0015] Preferably, the method further comprises: Test the amplitude and phase between channels of digital beam synthesis; Compensate the amplitude and phase of the digital beam dimension of the digital-analog front end, and retest and verify until the amplitude and phase difference between channels is close to zero; Solidify the 3D beam phase code of the digital-to-analog digital beamforming and complete the array far-field test; The initial state amplitude and phase data of each channel of the digital-analog front end after the test is cleared is used as a reference for real-time amplitude and phase state calibration; The amplitude and phase states of each channel in the working state are detected.

[0016] The present invention also provides a two-dimensional phased array digital-analog front-end calibration implementation system, the system comprising: A local oscillator frequency conversion loop, used to calibrate the linear arrays of multiple channels of the microwave front end respectively, wherein the front end of the local oscillator frequency conversion loop is connected to the frequency conversion module, and the rear end is connected to the antenna radiation unit of the microwave front end; The calibration network is used to calibrate multiple linear arrays. The calibration network includes a calibration channel and an auxiliary antenna connected to each other. The calibration channel is connected to the frequency conversion module and the digital-analog module respectively.

[0017] Preferably, the two-dimensional phased array digital-analog front end is calibrated using any of the methods described above.

[0018] The technical solution provided by the present invention may include the following beneficial effects: The circuit required for the calibration implementation method of the present invention is simple and suitable for a highly integrated two-dimensional phased array front-end system. It does not require a coupler and a switch network to be added to each antenna array element. It only requires an external auxiliary antenna, which greatly reduces the complexity and cost of the antenna system. The calibration accuracy is high, which is conducive to the mass production of products. The present invention greatly reduces the complexity of the calibration work. The channels in the spatial synthesis dimension only need to be calibrated at the microwave front end without repeated calibration. The channels in the digital beamforming direction dimension can be calibrated in real time, which greatly reduces the workload and is suitable for the calibration of ultra-large arrays, greatly improving work efficiency. The present invention does not require the addition of special network circuits and peripheral controls, and is suitable for the direct expansion of the array. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings herein are incorporated into the specification and constitute a part of the specification, represent embodiments consistent with the present disclosure, and are used together with the specification to explain the principles of the present disclosure. Obviously, the drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 The present invention shows the implementation scheme of the calibration network in the two-dimensional phased array system in the prior art; Figure 2 A schematic diagram of an N-element linear array in the prior art is shown; Figure 3 The working block diagram of a two-dimensional digital-analog hybrid phased array system in the prior art is shown; Figure 4 A flow chart of a method for implementing a two-dimensional phased array digital-analog front-end calibration in an exemplary embodiment of the present invention is shown; Figure 5 A block diagram of a microwave front-end channel calibration operation of a two-dimensional digital-analog hybrid phased array system in an exemplary embodiment of the present invention is shown; Figure 6 A block diagram of a microwave front-end channel calibration operation of a two-dimensional digital-analog hybrid phased array system in an exemplary embodiment of the present invention is shown; Figure 7 A principle block diagram of a two-dimensional phased array digital-analog front-end calibration implementation method in an exemplary embodiment of the present invention is shown; Figure 8 A specific step diagram of a method for implementing a two-dimensional phased array digital-analog front-end calibration in an exemplary embodiment of the present invention is shown; Fig. 9 The azimuth center frequency scanning pattern in an exemplary embodiment of the present invention is shown; Fig.10 The scanning pattern of the central frequency point in the elevation dimension in an exemplary embodiment of the present invention is shown. DETAILED DESCRIPTION

[0021] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that the present invention will be more comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0022] In addition, the accompanying drawings are only schematic illustrations of embodiments of the present invention and are not necessarily drawn to scale. The same reference numerals in the drawings represent the same or similar parts, and their repeated descriptions will be omitted. Some of the block diagrams shown in the accompanying drawings are functional entities and do not necessarily correspond to physically or logically independent entities.

[0023] The beam scanning of the phased array antenna is achieved by controlling the phase of the phase shifter of each radiating unit to form a scanning equiphase surface, and the phase scanning is achieved by controlling the state of the phase shifter to change the excitation phase of each antenna array element. Figure 2 As shown, taking an N-element linear array as an example, d is the spacing between antenna elements, φ is the phase difference between channels, and 2πdsinθ / λ is the phase difference of the radiation field of adjacent antenna elements caused by the path difference. The sum of the field intensity synthesis vector of the radiation field of each element at a point in the far field in the θ direction is:

[0024] By changing the φ value, the beam pointing angle θ can be changed, thereby forming a beam scan. When the system is working, the amplitude and phase of the transmitted and received signals are weighted for spatial synthesis. Since the signal level entering the array is low, the signal must be amplified, transformed, and processed before processing. The physical basis of array signal processing is that after the signal enters each array unit, the output signals of each unit are strictly correlated. Therefore, it is required that the signals entering each channel after amplification and transformation are strictly consistent; otherwise, if the amplitude and phase of the signal output by each channel are inconsistent with the amplitude and phase of the received signal, it will cause the directional pattern to deform, and in severe cases, it will even make the directional pattern completely invalid. Therefore, ensuring the consistency of the amplitude and phase of the signals in each channel through calibration is the key to ensuring normal operation.

[0025] For a two-dimensional phased array microwave system with one-dimensional spatial synthesis and one-dimensional digital beamforming, the consistency of the transmit and receive channel links includes the amplitude and phase consistency of the microwave front-end channel and the amplitude and phase consistency between the digital and analog channels.

[0026] Depend on Figure 3 It can be seen that the signal transmission path of the m*n two-dimensional digital-analog hybrid phased array system can be divided into two parts: the microwave front-end signal transmission path , digital and analog signal transmission path The microwave front-end signal transmission path also includes antenna radiation units. 、TR component microwave signal transmission path and signal transmission path in microwave frequency conversion channel Therefore, system calibration is to use one channel as the reference and compare the amplitude phase difference of the remaining channels with it, that is, - , - , - … The two-dimensional phased array microwave system with one-dimensional spatial synthesis and one-dimensional digital beam synthesis is mainly aimed at the problem that as the operating frequency increases, direct two-dimensional digital beamforming cannot be achieved in the hardware unit spacing of the two-dimensional phased array system. On the one hand, it can reduce the volume requirement of the tile-type TR component to achieve faster and more flexible beam control, and on the other hand, it can significantly reduce the system cost.

[0027] according to Figure 3 Working principle of two-dimensional digital-analog hybrid phased array system: For a two-dimensional array with m*n units, if the traditional single-channel coupler plus single-pole double-throw switch solution is adopted, m*n sets of switches are required, and the antenna design and processing complexity and cost are greatly increased. In particular, as the operating frequency increases, the unit spacing is further reduced, and it is impossible to place such a high-density switch network. If a single-channel coupler plus a power divider is directly used, the isolation of the power divider is limited, and the mutual coupling between antenna units is serious, which will lead to calibration failure.

[0028] In view of the above reasons, the present invention regards a two-dimensional array with m*n units as n m-channel linear arrays: each m-channel linear array has a common internal frequency conversion channel and digital-to-analog / analog-to-digital conversion, that is, + The same, only the amplitude and phase difference of each TR channel plus the antenna radiation element path in the linear array needs to be considered ( + ).

[0029] The present invention provides a two-dimensional phased array digital analog front end calibration implementation method, such as Figure 4 As shown, the method includes: S100, calibrating the linear arrays of multiple channels of the microwave front end respectively using a local oscillator frequency conversion loop, wherein the front end of the local oscillator frequency conversion loop is connected to the frequency conversion module, and the rear end is connected to the antenna radiation unit of the microwave front end.

[0030] S200, calibrating multiple linear arrays using a calibration network, wherein the calibration network includes a calibration channel and an auxiliary antenna connected to each other, and the calibration channel is connected to a frequency conversion module and a digital-analog module respectively.

[0031] In this embodiment, the circuit required for the calibration implementation method is simple and suitable for a highly integrated two-dimensional phased array front-end system. It does not require a coupler and a switch network to be added to each antenna array element. Only an external auxiliary antenna is required, which greatly reduces the complexity and cost of the antenna system. The calibration accuracy is high, which is conducive to the mass production of products. The present invention greatly reduces the complexity of the calibration work. The channels in the spatial synthesis dimension only need to be calibrated at the microwave front end without repeated calibration. The channels in the digital beamforming direction dimension can be calibrated in real time, which greatly reduces the workload and is suitable for the calibration of ultra-large arrays, greatly improving work efficiency. The present invention does not require the addition of special network circuits and peripheral controls, and is suitable for the direct expansion of the array.

[0032] Based on the above embodiments, it can be understood that in S100, the linear array of each channel includes multiple antenna radiating units, and when calibrating the linear array of a channel, the calibration of the linear array of the channel is completed by switching the antenna radiating units.

[0033] The calibration of multi-channel linear arrays can be performed in a variety of ways: First, the TR components and antenna arrays are designed to be consistent, so that the units are completely interchangeable. Second, the TR components and antenna arrays are calibrated separately, and the channel-to-channel calibration can be easily obtained through experimental instruments. , The amplitude and phase difference can directly obtain a comparison table of amplitude, phase and frequency in a complete linear array. By compensating the table, the final radiation pattern can be accurately generated. Third, the near-field calibration of the linear array uses the probe to scan the antenna aperture plane, and the amplitude and phase information on the aperture plane are measured, and then the near-field data is converted into far-field data through Fourier transform. In order to improve the calibration efficiency, a local oscillator frequency conversion loop is added in the present invention, such as Figure 5 As shown in the figure, the microwave front-end signal transmission path of each channel can be obtained by conventional S parameter scanning of the vector network. Amplitude inconsistency.

[0034] This application uses a constant channel normalization reference, and each m-channel linear array only needs to switch the antenna radiation unit to quickly complete the calibration; while ensuring the stability of the input connection, the intermediate frequency signal of the frequency conversion module needs to be switched between the linear arrays to achieve accurate calibration of the microwave front end. If the antenna unit consistency is good, the RF switch network and the intermediate frequency switch network can be directly added to achieve faster calibration.

[0035] After the calibration of the microwave front end of m*n units is completed, it is necessary to connect the digital-analog channels to calibrate the n linear arrays of the entire system. Therefore, when designing the system, a calibration network needs to be added between the n linear arrays to enable real-time calibration. Compared with the traditional m*n switch calibration network, this application only needs one calibration channel and auxiliary antenna to realize the real-time status self-check of the system, which greatly reduces the complexity and cost. Figure 6shown.

[0036] Figure 7 The principle block diagram of the two-dimensional phased array digital-analog front-end calibration implementation method of the present invention is shown. Taking the design and implementation method of the calibration network of the two-dimensional phased array digital-analog front-end system with 8*32 channels X-band one-dimensional spatial synthesis and one-dimensional digital beam synthesis as an example, the specific implementation of the present invention is explained.

[0037] The X-band one-dimensional spatial synthesis and one-dimensional digital beamforming two-dimensional phased array microwave system is mainly composed of 32 8-channel linear arrays and a digital-analog calibration network. The system operating frequency range is: 8.0GHz ~10.5GHz, signal bandwidth is 1GHz; antenna beam scanning range: azimuth angle Φ: 0~90 o ; Pitch angle θ: 0~30 o , beam width azimuth: ≤3.5°, pitch: ≤13°; unit spacing is 16mm*21mm.

[0038] In addition to meeting the 40% relative working bandwidth, the antenna unit is also required to have wide-angle scanning characteristics, using the Vivaldi antenna form, which is composed of multi-layer microwave dielectric boards. Other active components and parts are selected from the domestic multi-functional multi-channel integrated chips of the 55th and 13th Institutes of China Electronics Technology Group Corporation, and the multi-channel analog-to-digital / digital-to-analog conversion chip uses the RFSoC transceiver of Xilinx.

[0039] In this embodiment, in order to ensure the amplitude and phase consistency of the 8-channel receiving and transmitting in the linear array and the assemblability of the project, the TR components are selected to use 8 fully interchangeable 8*4-way tile-type TR components. Through wiring control and device selection, the amplitude and phase consistency of the 8-way signals in the linear array can be fully guaranteed. The final measured phase difference between channels can reach 10 o The amplitude difference is within 0.5dB. The array antenna is a completely consistent repeating unit, which can fully guarantee the amplitude and phase consistency.

[0040] The two-dimensional phased array digital-analog front-end frequency synthesizer adds a calibration local oscillator signal frequency conversion channel and a switching switch, which are integrated with the local oscillator signal generation circuit inside the frequency synthesizer. When the microwave front end is calibrated, the local oscillator signal is switched to the calibration local oscillator signal frequency conversion channel to ensure a closed-loop calibration link and achieve fast calibration; during normal operation, it switches to the internal local oscillator signal generation channel. At the same time, a calibration auxiliary channel is added inside the array to achieve calibration of the array's complete digital-analog channels on the one hand, and to complete real-time calibration at work with the help of auxiliary antennas on the other.

[0041] Figure 8 The specific steps of the two-dimensional phased array digital analog front-end calibration implementation method of the present invention are shown as follows: 1. The tile-type TR components and antenna arrays in the two-dimensional phased array are tested separately. The 8 channels inside the 8 groups of linear arrays of the TR components are tested separately by the vector network analyzer to ensure the consistency of the antenna array and the amplitude and phase fluctuation consistency within the TR component band as much as possible; 2. With the help of the local oscillator auxiliary frequency conversion channel, the 8*32 channels of the microwave front end are calibrated separately to form 256 sets of initial amplitude and phase difference data of the microwave front end array. ; 3. Normalize the initial amplitude and phase of the microwave front-end array and retest and verify; 4. Solidification of spatial synthesis phase matching code of microwave front-end array; 5. Initial state test and normalization between channels of digital and analog modules; 6. Two-dimensional phased array digital front-end digital beam initial amplitude and phase test, forming 32 initial amplitude and phase values , … , forming a two-dimensional matrix associated with frequency.

[0042] 7. Retest and verify the amplitude and phase compensation of the digital beam dimension at the digital-analog front end until the amplitude and phase difference between channels is as close to zero as possible; 8. The digital-to-analog digital beamforming dimensional beam phase code is solidified, and the array far-field test is completed; the far-field test diagram of this embodiment is shown in Fig. 9 (azimuth center frequency scanning pattern), Fig.10 (Scanning pattern of center frequency in elevation dimension); 9. Install the auxiliary antenna and test the initial state amplitude and phase data of each channel of the digital-analog front end after clearing to form a two-dimensional matrix related to the frequency. , the stored data is used as a reference for real-time amplitude and phase state calibration.

[0043] 10. Under normal working conditions, the amplitude and phase status of each channel are detected with the help of auxiliary antenna.

[0044] The present invention is aimed at a two-dimensional phased array microwave system with one-dimensional spatial synthesis and one-dimensional digital beam synthesis. In order to achieve the system's real-time, high-speed, high-precision, and low-cost calibration requirements, an efficient two-dimensional phased array digital-analog front-end calibration implementation method is proposed, which significantly reduces the difficulty of system calibration. It not only simplifies the circuit design and processing complexity of the tile antenna, but also meets the system's high integration, accuracy, speed, and low cost requirements.

[0045] It should be understood that, in the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do 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. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0046] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present invention are indicated by the appended claims.

Claims

1. A two-dimensional phased array digital-analog front-end calibration implementation method, characterized in that: The method comprises: S100, calibrating the linear arrays of multiple channels of the microwave front end respectively by using a local oscillator frequency conversion loop, wherein the front end of the local oscillator frequency conversion loop is connected to the frequency conversion module, and the rear end is connected to the antenna radiation unit of the microwave front end; S200, calibrating multiple linear arrays using a calibration network, wherein the calibration network includes a calibration channel and an auxiliary antenna connected to each other, and the calibration channel is connected to a frequency conversion module and a digital-analog module respectively.

2. The two-dimensional phased array digital-analog front-end calibration implementation method according to claim 1 is characterized in that: In S100, the linear array of each channel includes a plurality of antenna radiating units. When calibrating the linear array of a channel, the calibration of the linear array of the channel is completed by switching the antenna radiating units.

3. The two-dimensional phased array digital-analog front-end calibration implementation method according to claim 2 is characterized in that: When calibrating the line arrays of different channels, the intermediate frequency signal of the frequency conversion module of the calibrated channel is switched accordingly.

4. The two-dimensional phased array digital-analog front-end calibration implementation method according to claim 1 is characterized in that: In S200, the calibration channel includes: an auxiliary digital-to-analog channel and an auxiliary frequency conversion channel, the auxiliary digital-to-analog channel is connected to the digital-to-analog module, the auxiliary frequency conversion channel is connected to the frequency conversion module, and the auxiliary frequency conversion channel is also connected to the auxiliary antenna.

5. The two-dimensional phased array digital-analog front-end calibration implementation method according to claim 1 is characterized in that: In S100, the step of using the local oscillator frequency conversion loop to calibrate the linear arrays of multiple channels of the microwave front end respectively includes: Using a local oscillator frequency conversion loop to calibrate the linear arrays of multiple channels of the microwave front end respectively, and obtain initial amplitude and phase difference data of the microwave front end array; Normalizing the initial amplitude and phase difference data of the microwave front-end array, and retesting and verifying; The spatial synthesis phase code of the microwave front-end array is solidified.

6. The two-dimensional phased array digital-analog front-end calibration implementation method according to claim 5 is characterized in that: In S200, the step of calibrating multiple linear arrays using a calibration network includes: Test the initial amplitude and phase between channels of digital-analog modules; Normalize the initial amplitude and phase between channels of the digital-to-analog module.

7. The two-dimensional phased array digital-analog front-end calibration implementation method according to claim 6 is characterized in that: The method further comprises: Test the amplitude and phase between channels of digital beam synthesis; Compensate the amplitude and phase of the digital beam dimension of the digital-analog front end, and retest and verify until the amplitude and phase difference between channels is close to zero; Solidify the 3D beam phase code of the digital-to-analog digital beamforming and complete the array far-field test; The initial state amplitude and phase data of each channel of the digital-analog front end after the test is cleared is used as a reference for real-time amplitude and phase state calibration; The amplitude and phase states of each channel in the working state are detected.

8. A two-dimensional phased array digital-analog front-end calibration implementation system, characterized in that: The system comprises: A local oscillator frequency conversion loop, used to calibrate the linear arrays of multiple channels of the microwave front end respectively, wherein the front end of the local oscillator frequency conversion loop is connected to the frequency conversion module, and the rear end is connected to the antenna radiation unit of the microwave front end; The calibration network is used to calibrate multiple linear arrays. The calibration network includes a calibration channel and an auxiliary antenna connected to each other. The calibration channel is connected to the frequency conversion module and the digital-analog module respectively.

9. The two-dimensional phased array digital-analog front-end calibration implementation system according to claim 8, characterized in that: The two-dimensional phased array digital-analog front end is calibrated using the method described in any one of claims 1 to 7.

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