Real-time multi-channel correction method and system for millimeter wave transceiver

Abstract

The embodiment of the invention provides a real-time multi-channel correction method and system for a millimeter wave transceiver. The method comprises the following steps: firstly detecting and acquiring amplitudes and phases of a plurality of radio frequency links of the transceiver, respectively acquiring an amplitude difference and a phase difference between any two radio frequency links according to the amplitudes and the phases of the plurality of radio frequency links, and finally acquiring the amplitude difference and the phase difference between any two radio frequency links according to the amplitudes and the phases of the plurality of radio frequency links. And performing amplitude and phase correction on the plurality of channels according to the amplitude difference and the phase difference between any two radio frequency links and the pre-acquired amplitude difference and the pre-acquired phase difference between the correction networks corresponding to any two channels. According to the method, the amplitude difference and the phase difference between the correction networks corresponding to any two channels are obtained in advance, so that the preliminarily designed correction network can be used for replacing the accurately designed correction network, the design difficulty of the correction network is reduced, meanwhile, the amplitude difference and the phase difference between the correction networks implied in the correction data used in the real-time correction process are eliminated, and the correction accuracy is improved. And the effect of improving the correction precision is achieved.

Description

Technical Field

[0001] The present application relates to the field of wireless communications, and in particular to a real-time multi-channel calibration method and system for a millimeter wave transceiver. Background Art

[0002] With the rapid development of wireless communication technology, the internal design of transceivers is becoming more and more complex. The signal links, circuit components, and RF chips in different channels of the transceiver have inconsistent amplitude and phase. These problems will cause serious mismatches in the amplitude and phase of signals in different channels during transmission and reception. If these problems are ignored during data processing, serious errors will occur in the modulation and demodulation results. Therefore, a calibration method is needed to compensate for each channel of the transceiver so that the amplitude and phase of each channel in the transceiver remain consistent.

[0003] The correction method for transceivers in the prior art mainly relies on the standardized design of the correction network or the offline non-real-time correction data measurement. The correction network inside the transceiver is a precisely designed correction network. In the entire correction process, the invisible amplitude and phase differences after the correction network is processed are not considered, and each channel of the transceiver is directly compensated.

[0004] With the increase in the number of transceiver channels and the increase in the operating frequency band, the difficulty of designing a correction network with consistent amplitude and phase has increased significantly. The correction network design in the existing correction method is complex and has hidden amplitude and phase errors, which is not fully suitable for the development of a new generation of transceivers with integrated functions and expanded caliber. Summary of the invention

[0005] The embodiments of the present application provide a millimeter wave transceiver real-time multi-channel calibration method and system, so as to reduce the difficulty of calibration network design and improve the calibration accuracy.

[0006] In a first aspect, an embodiment of the present application provides a millimeter wave transceiver real-time multi-channel calibration method, comprising:

[0007] Detecting and acquiring the amplitude and phase of multiple radio frequency links of the transceiver, each radio frequency link including a correction network and a channel;

[0008] According to the amplitudes and phases of the multiple radio frequency links, respectively obtaining an amplitude difference and a phase difference between any two radio frequency links;

[0009] Amplitude and phase correction is performed on multiple channels according to the amplitude difference and phase difference between any two radio frequency links and the amplitude difference and phase difference between the correction networks corresponding to any two channels acquired in advance.

[0010] In a possible implementation, performing amplitude and phase correction on multiple channels according to the amplitude difference and phase difference between any two radio frequency links and the pre-acquired amplitude difference and phase difference between correction networks corresponding to any two channels includes:

[0011] Subtract the amplitude difference between the first channel and the second channel obtained in advance from the amplitude difference between the first RF link and the second RF link, so as to complete the amplitude correction between the first channel and the second channel;

[0012] Subtract the phase difference between the correction network corresponding to the first channel and the correction network corresponding to the second channel obtained in advance from the phase difference between the first radio frequency link and the second radio frequency link, so as to complete the phase correction between the first channel and the second channel;

[0013] The first RF link is any RF link among the multiple RF links, the second RF link is any link among the multiple RF links except the first RF link, the first channel is the channel included in the first RF link, and the second channel is the channel included in the second RF link.

[0014] In a possible implementation manner, before performing amplitude and phase correction on multiple channels according to the amplitude difference and phase difference between any two RF links and the pre-acquired amplitude difference and phase difference between the correction networks corresponding to any two channels, the method further includes:

[0015] Acquire the amplitude and phase of the correction network corresponding to each channel in the transceiver obtained by testing with a vector network analyzer;

[0016] According to the amplitude and phase of the correction network corresponding to each channel, the amplitude difference and phase difference between the correction networks corresponding to any two channels are calculated.

[0017] In a possible implementation manner, the obtaining the amplitude and phase of the correction network corresponding to each channel in the transceiver obtained by testing with a vector network analyzer includes:

[0018] When the transceiver meets the preset amplitude and phase correction conditions, a test environment is constructed, wherein the test environment includes: a vector network analyzer, one end of the vector network analyzer is connected to a horn antenna, and the other end is connected to the transceiver, the horn antenna is aligned with the center of any phased array antenna PAA in the transceiver, and the test environment is a microwave darkroom environment;

[0019] Controlling the vector network analyzer to send a correction signal, the correction signal passes through a correction network corresponding to the PAA, and detecting a detection signal returned by the correction network through the vector network analyzer;

[0020] The amplitude and phase of the correction network corresponding to the channel including the PAA are determined according to the correction signal and the detection signal.

[0021] In a possible implementation, the method further includes:

[0022] Modeling any two radio frequency links according to characteristic parameters of components used in the radio frequency link in the transceiver to obtain a two-port network model;

[0023] Based on the two-port network model, determining whether reflections of the two radio frequency links can be ignored;

[0024] If the reflections of the two radio frequency links are negligible, determining that the transceiver meets the amplitude and phase correction condition;

[0025] Otherwise, it is determined that the transceiver does not meet the amplitude and phase correction condition.

[0026] In a possible implementation, the method further includes:

[0027] Constructing a verification environment, wherein the verification environment includes: a signal generator, wherein the signal generator is connected to a horn antenna, wherein the horn antenna is aligned with the center of any phased array antenna PAA in the transceiver, and the verification environment is a microwave darkroom environment;

[0028] Controlling the signal generator to transmit a signal, and the signal enters a channel corresponding to the PAA;

[0029] Determining the amplitude and phase of the channel according to the output signal output from the channel;

[0030] Determining the amplitude difference and phase difference between any two channels according to the amplitude and phase of each channel in the receiver;

[0031] The calibration accuracy is verified based on the amplitude difference and phase difference between any two RF links in which the calibration network is set during the calibration process, the amplitude difference and phase difference between any two channels, and the amplitude difference and phase difference between the calibration networks corresponding to any two channels.

[0032] In a second aspect, an embodiment of the present application provides a millimeter wave transceiver real-time multi-channel calibration device, comprising:

[0033] A detection module, used to detect and obtain the amplitude and phase of multiple radio frequency links of the transceiver, each radio frequency link including a correction network and a channel;

[0034] A processing module, configured to obtain an amplitude difference and a phase difference between any two radio frequency links according to the amplitudes and phases of the plurality of radio frequency links;

[0035] The correction module is used to perform amplitude and phase correction on multiple channels according to the amplitude difference and phase difference between any two radio frequency links and the amplitude difference and phase difference between the correction networks corresponding to any two channels acquired in advance.

[0036] In a third aspect, an embodiment of the present application provides a millimeter wave transceiver real-time multi-channel calibration system, including:

[0037] A server, and a millimeter wave transceiver connected to the server, wherein the millimeter wave transceiver is provided with a correction source and a correction network;

[0038] The server is used to execute the above first aspect and / or various possible implementation methods of the first aspect.

[0039] In a fourth aspect, an embodiment of the present application provides a millimeter wave transceiver real-time multi-channel test system, including:

[0040] A vector network analyzer, one end of the vector network analyzer is connected to a horn antenna and the other end is connected to the transceiver, the horn antenna is aligned with the center of any phased array antenna PAA in the transceiver, and the test system is in a microwave darkroom environment;

[0041] The vector network analyzer is used to send a correction signal, the correction signal passes through the correction network corresponding to the PAA, and the detection signal returned by the correction network is detected by the vector network analyzer. The correction signal and the detection signal are used to determine the amplitude and phase of the correction network corresponding to the channel including the PAA.

[0042] In a fifth aspect, an embodiment of the present application provides a millimeter wave transceiver real-time multi-channel calibration system, including:

[0043] A signal generator, wherein the signal generator is connected to a horn antenna, the horn antenna is aligned with the center of any phased array antenna PAA in the transceiver, and the verification system is in a microwave darkroom environment;

[0044] The signal generator is used to transmit a signal, the signal enters a channel corresponding to the PAA, and the output signal output from the channel is used to determine the amplitude and phase of the channel.

[0045] The real-time multi-channel correction method and system for a millimeter-wave transceiver provided in the embodiments of the present application adopt a means of pre-acquiring the amplitude difference and phase difference between the correction networks corresponding to any two channels, and eliminates the amplitude difference and phase difference between the correction networks implicit in the correction data used through server processing. Therefore, the correction network used by the transceiver in the present invention can replace the precisely designed correction network with a preliminarily designed correction network, thereby achieving the effect of reducing the difficulty of correction network design and improving correction accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0047] Figure 1 A schematic diagram of a flow chart of Embodiment 1 of a real-time multi-channel calibration method for a millimeter wave transceiver provided in the present application;

[0048] Figure 2 A schematic diagram of the correction environment in the real-time multi-channel correction method for a millimeter wave transceiver provided in the present application;

[0049] Figure 3 A schematic diagram of a two-port network model of any two components in a radio frequency link in the real-time multi-channel calibration method for a millimeter wave transceiver provided in the present application;

[0050] Figure 4 A flowchart of Embodiment 2 of the real-time multi-channel calibration method for a millimeter wave transceiver provided in the present application;

[0051] Figure 5 A schematic diagram of a calibration network test environment in the real-time multi-channel calibration method for a millimeter wave transceiver provided in the present application;

[0052] Figure 6 A flowchart of Embodiment 3 of the real-time multi-channel calibration method for a millimeter wave transceiver provided in the present application;

[0053] Figure 7 A schematic diagram of a correction data verification environment in the real-time multi-channel correction method for a millimeter wave transceiver provided in the present application;

[0054] Figure 8 A flowchart of a fourth embodiment of the real-time multi-channel calibration method for a millimeter wave transceiver provided in the present application;

[0055] Fig. 9 A schematic diagram of the structure of the real-time multi-channel calibration device for a millimeter wave transceiver provided in this application;

[0056] Fig.10 A schematic diagram of the structure of the millimeter wave transceiver real-time multi-channel correction system provided in this application;

[0057] Fig.11 A schematic diagram of the structure of the millimeter wave transceiver real-time multi-channel test system provided in this application;

[0058] Fig.12 This is a schematic diagram of the structure of the millimeter wave transceiver real-time multi-channel verification system provided in this application.

[0059] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0060] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0061] First, the terms involved in this application are explained:

[0062] Phased Array Antenna System: The Phased Array Antenna (PAA) system is a multi-antenna, multi-channel transceiver system with electronic steering function. Its characteristic is that it can easily change the direction of the beam transmitted by the antenna by controlling the amplitude and phase of the signal transmitted by different antenna units without physically moving the antenna. The phased array antenna system can more conveniently detect targets in different directions, improve the problem of insufficient flexibility, and expand the detection range.

[0063] Internal correction method: The internal correction method is to design a transmission line (i.e., correction network) with equal amplitude and phase embedded in the RF hardware to perform correction inside the system. The entire correction process is not affected by antenna radiation, and the correction accuracy is often very high. Generally speaking, the internal correction method can usually achieve real-time channel correction because it does not require other external devices or instruments for correction.

[0064] In order to clearly understand the technical solution of the present application, the solution of the prior art is introduced in detail below.

[0065] In the modern society where the amount of information is growing rapidly, people are constantly pursuing faster and higher-quality information transmission, and wireless communication technology has therefore flourished. The original wireless communication system used a single-antenna single-channel structure transceiver with only one antenna, and detection in different directions also required mechanical structure rotation, which was not flexible enough to use, and the transmission distance of a single antenna was also greatly limited. Therefore, researchers found that increasing the number of antennas and channels can effectively make up for these shortcomings, and multi-channel phased array antenna systems came into being. It has many advantages such as fast beam switching and flexible beam forming, which improves the performance of the system to a certain extent and is widely used in military or civilian wireless communications and radar systems. However, the phased array antenna has a complex structure, and the signal links, circuit elements, and RF chips in different channels have inconsistent amplitude and phase, which will greatly affect the signal strength and pointing error of the beam, thereby affecting the imaging quality of the radar and deteriorating the performance of the entire phased array antenna system. Therefore, the phased array antenna must perform phase correction between channels, especially phase correction of circuits including RF transceiver chips.

[0066] In order to solve the problem of inconsistent amplitude and phase, a correction instrument, correction device or correction circuit can be used to measure the difference in amplitude and phase of the channel of the system to be compensated. Depending on whether the system contains a correction network, the multi-channel correction method can be divided into factory correction method and online correction method.

[0067] Factory calibration is generally used to calibrate the target during the assembly and testing phase. The work is cumbersome and time-consuming, and the calibration accuracy depends on the analog phase shifter, which often does not provide high enough calibration accuracy and good enough calibration effect. In addition, integrated RF transceiver chips often use internal phase-locked loop modules to generate local oscillator signals, but in phased array radars, multiple RF transceiver chips are often required to be used simultaneously, which leads to inconsistencies in the local oscillator phases between channels, and the initial phase of the local oscillator is not fixed each time it is powered on, so the phase difference between channels is also not fixed. Although some RF transceiver chips have begun to integrate multi-chip phase synchronization algorithms to solve this problem, such chips are often expensive and sold at high prices. Therefore, the method of using analog phase shifters for phase correction is not flexible enough and it is difficult to solve the problem of random phase errors.

[0068] Online calibration refers to real-time calibration of the target device when it is in use. Online calibration methods can be divided into near-field calibration, far-field calibration and internal calibration. Near-field and far-field calibration methods require simple calibration networks, and the calibration accuracy is also relatively good. However, they also need to be tested in a microwave darkroom environment, and the maintenance cost is high. The internal calibration method is to design a transmission line (i.e., calibration network) with equal amplitude and phase embedded in the RF hardware. The calibration signal of the internal calibration method does not pass through the antenna, and it is calibrated inside the system. Therefore, the entire calibration process is not affected by antenna radiation, so the calibration accuracy is often very high. Generally speaking, the internal calibration method can realize the channel calibration function in real time because it does not require other external devices or instruments for calibration.

[0069] Although the internal correction method has high accuracy and can perform real-time correction. However, in the internal correction method of the prior art, the correction network inside the transceiver is a precisely designed correction network. When the electrical size becomes larger and the frequency band becomes higher, the complexity of designing the correction network will increase accordingly. Moreover, in the entire correction process, the invisible amplitude and phase differences that exist after the correction network is processed are not considered, and each channel of the transceiver is directly compensated. Therefore, the correction network in the existing correction method is complex in design and has hidden amplitude and phase differences, which is not completely suitable for the research and development of a new generation of transceivers with integrated functions and expanded caliber.

[0070] Based on the description of the existing real-time multi-channel correction method and system for millimeter-wave transceivers in the above background technology, in the previous correction methods, since the frequency band of the transceiver is not high and the channels are not many, it is not difficult to design a correction network with consistent amplitude and phase. Even when the processing causes the amplitude and phase consistency of the correction network to deteriorate, the impact on the phase will not be great. Therefore, the correction process directly ignores this small difference and uses a precisely designed correction network to directly correct the amplitude and phase of the multi-channel. This means that although the amplitude and phase consistency of the correction network designed by the simulation is good, it is unclear whether the amplitude and phase of the correction network are consistent after processing, which poses a hidden danger. In short, in the prior art, the correction network used by the transceiver is difficult to design, and there is a hidden problem of data analysis failure caused by the amplitude and phase imbalance of the correction network caused by processing errors. When compensating for the differences between channels in the RF link, the amplitude and phase differences of the correction network are not removed, which reduces the accuracy of compensation for each channel.

[0071] The real-time multi-channel correction method for a millimeter wave transceiver provided in the present application adopts a means of pre-acquiring the amplitude difference and phase difference between the correction networks corresponding to any two channels, and eliminates the amplitude difference and phase difference between the correction networks implicit in the correction data used through server processing during the real-time correction process. Therefore, the correction network used by the transceiver in the present invention can replace the precisely designed correction network with a preliminarily designed correction network, thereby achieving the effect of reducing the difficulty of correction network design and improving correction accuracy.

[0072] The present application provides a real-time multi-channel calibration method for a millimeter wave transceiver, which can be applied to the calibration of communication equipment such as large-aperture fifth-generation mobile communication technology (5th Generation Mobile Communication Technology, 5G) or sixth-generation mobile communication technology (6th Generation Mobile Communication Technology, 6G), complex multi-channel transceivers and large-scale multiple-input multiple-output (Multiple-Input Multiple-Output, MIMO), and the present application does not limit the specific device form. In addition, the calibration method provided by the present invention also has certain benefits and promotion effects on improving the application of Integrated Sensing And Communications (ISAC).

[0073] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0074] Figure 1 This is a flow chart of the first embodiment of the real-time multi-channel calibration method for a millimeter wave transceiver provided in the present application, as shown in FIG. Figure 1 As shown, the steps of embodiment 1 are as follows:

[0075] S101: Detect and obtain the amplitude and phase of multiple radio frequency links of a transceiver, where each radio frequency link includes a correction network and a channel.

[0076] Figure 2 Schematic diagram of the correction environment in the real-time multi-channel correction method for the millimeter wave transceiver provided in the present application. Specifically, the server is connected to the transceiver, the black lines between the components are microstrip lines and strip lines, and the correction signal sent by the correction source passes through the Figure 2The correction network and transceiver channel in the RF link shown in the figure, wherein the mixer, filter, low noise amplifier and other components are the transceiver channel in the RF link. The core processing unit (System on Chip, SOC) has data processing units such as digital to analog converters (Digital to Analog Converters, ADC) and analog to digital converters DAC (Digital to Analog Converters, ADC), as well as a first-in first-out data storage buffer (FirstIn FirstOut, FIFO) for data transmission.

[0077] In addition, it should be understood that the antenna systems inside the vast majority of millimeter wave transceivers are PAA systems, and the amplitude and phase differences generated by transceivers with other antenna systems other than PAA systems are smaller than the amplitude and phase differences generated by transceivers with PAA antenna systems. Figure 2 The amplitude and phase differences of the wave transceiver shown in the figure can be compensated in real time, and this correction method is also applicable to other transceivers.

[0078] In this step, the correction signal passes through the correction network and is coupled to the receiving channel through a coupler. The final signal returns to the digital-to-analog converter ADC in the SOC. The ADC processes the signal data to obtain digital data, which can be transmitted to the server through the FIFO. The server can detect and obtain the amplitude and phase of multiple channels of the transceiver. Among them, the other end of the phase shifter connected to the PAA system is disconnected, which can ensure that the entire receiving channel is not interfered by the signal received by the PAA system.

[0079] In the specific application implementation of this solution, it should be understood that the correction source, the correction network and the transceiver channel share a core processing unit SOC, so this solution embeds the correction source and the correction network into the transceiver together, and feeds the correction source through the core processing unit, so that the correction source can generate a continuous correction signal. Compared with the traditional method of placing the correction source outside the transceiver, this solution embeds the correction source inside the transceiver. Therefore, when the correction source is powered on, real-time correction can be performed at any time and any place, shortening the time required for real-time correction, avoiding frequent switching of the correction environment, and reducing the complexity of the real-time correction process of the transceiver.

[0080] In the specific application implementation of this solution, it should be understood that the correction network and channel can be regarded as a link only in the real-time correction process, and they are separate individuals at other times.

[0081] S102: Obtaining an amplitude difference and a phase difference between any two radio frequency links according to the amplitudes and phases of the plurality of radio frequency links.

[0082] In this step, if correction compensation is to be performed on each channel in the transceiver, it is necessary to know the amplitude difference and phase difference between any two RF links during the correction process. Specifically, the server needs to obtain the amplitude difference and phase difference between the first RF link and the second RF link based on the amplitude and phase of all RF links, wherein the first RF link is any link among the multiple RF links, and the second RF link is any link among the multiple RF links except the first RF link.

[0083] S103: performing amplitude and phase correction on multiple channels according to the amplitude difference and phase difference between any two radio frequency links and the pre-acquired amplitude difference and phase difference between correction networks corresponding to any two channels.

[0084] In this step, the amplitude difference between the first RF link and the second RF link is subtracted from the amplitude difference between the correction network corresponding to the first channel and the correction network corresponding to the second channel obtained in advance, so as to complete the amplitude correction between the first channel and the second channel; the phase difference between the first RF link and the second RF link is subtracted from the phase difference between the first RF link and the second RF link obtained in advance, so as to complete the phase correction between the first channel and the second channel; wherein, the first RF link is any RF link among the multiple RF links, the second RF link is any link among the multiple RF links except the first RF link, the first channel is a channel included in the first RF link, and the second channel is a channel included in the second RF link.

[0085] In the specific application implementation of this solution, it should be understood that during the calibration process, each channel is provided with a corresponding calibration network, and the channel and the corresponding calibration network are in the same RF link. Among them, the amplitude difference and phase difference between the calibration networks corresponding to any two channels obtained in advance are calibration network test data obtained in advance in the laboratory before the transceiver to which the calibration method of this solution is applied is put into use. Specifically, in the calibration network test environment constructed, the vector network analyzer and the server determine the amplitude difference and phase difference between the calibration networks corresponding to any two channels according to the transmitted signal and the received signal.

[0086] In the specific application of this solution, it should be understood that the phase shift of the entire loop of the real-time correction process Includes calibration network for partial phase shift Phase shift of the transmit and receive channels Ignoring other small phase shifts in the entire process, the first equation is used to express it. The second term in the following equation is the phase shift of the transmitting and receiving channels in the actual measurement process. The calculation method of .

[0087]

[0088] In the above formula is the phase measured on the server side, is the initial phase at the DAC in the SOC (see Figure 2 ). Because the data measured on the server changes in real time, you need to pay attention to It is not a relative phase, but an absolute phase, so this value can only be compared with the phase obtained at the same time, which is determined by the initial phase of SOC. The phase measured by the server during the actual calibration process is It not only contains the phase of the channel, but also implies the phase of the correction network corresponding to each channel.

[0089] In order to compare the data, we need to obtain the phase information of all different RF links at the same time. In this way, the initial phase of SOC can be considered is controlled as a constant, and then the phase on the server side is comparable, and finally the server can calculate the phase difference between any two RF links. The following formula is the calculation formula for the amplitude difference and phase difference between the jth RF link and the ith RF link:

[0090]

[0091] From the above formula, we can see that It includes not only the phase difference between the two channels in the radio frequency link, but also implies the phase difference between the correction networks corresponding to the two channels in the radio frequency link.

[0092] In the specific application implementation of this solution, it should be understood that the above-mentioned method for determining the phase difference is also applicable to the determination of the amplitude difference. Therefore, the relevant method for determining the amplitude difference is not repeated in this embodiment.

[0093] The real-time multi-channel correction method for a millimeter wave transceiver provided in the present embodiment first detects and obtains the amplitude and phase of multiple RF links of the transceiver, and calculates the amplitude difference and phase difference between any two RF links, and then determines the correction data for channel compensation according to the amplitude difference and phase difference between any two RF links and the amplitude difference and phase difference between correction networks corresponding to any two channels obtained in advance. Therefore, in the present correction method, the correction network can replace the precisely designed correction network with a preliminarily designed correction network, and the amplitude difference and phase difference between the correction networks corresponding to any two channels obtained by performing a correction network test experiment in advance before real-time correction eliminates the amplitude difference and phase difference between the correction networks implicit in the correction data, thereby achieving the effect of reducing the difficulty of correction network design and improving correction accuracy.

[0094] The above-mentioned embodiment is a specific application of the correction method provided by the present invention. Before applying the correction method to a certain transceiver, it is also necessary to judge the preset amplitude and phase correction conditions. Specifically, only when the reflection in the entire RF link in a certain transceiver is small enough to be ignored, the phases between the two RF links can be compared, and then the phase difference of the two components at the same position of the RF link can be directly added or subtracted to perform calculations. For example, if the transceiver meets the amplitude and phase correction conditions, the phase of the transceiver channel in the i-th RF link can be directly subtracted from the phase of the transceiver channel in the j-th RF link during the correction process to obtain the phase difference between the transceiver channels in the i-th RF link and the j-th RF link.

[0095] The preset amplitude and phase correction condition judgment process is as follows:

[0096] S201: Modeling any two radio frequency links according to characteristic parameters of components used in the radio frequency link in the transceiver to obtain a two-port network model.

[0097] S202: Based on the two-port network model, determine whether the reflections of the two radio frequency links can be ignored. If the reflections of the two radio frequency links can be ignored, determine that the transceiver meets the amplitude and phase correction condition; otherwise, determine that the transceiver does not meet the amplitude and phase correction condition.

[0098] In this solution, after establishing a two-port network model based on two RF links including channels and corresponding correction networks in the transceiver, the transmission line model matrix S of the two RF links can be determined through data processing in this step. According to the parameters S in S 11 It can be determined whether the transceiver meets the amplitude and phase correction conditions. If the transceiver meets the amplitude and phase correction conditions, the two components at the same position of the radio frequency link can be directly added or subtracted.

[0099] In the above steps, it is necessary to establish a two-port network model for any two RF links based on the characteristic parameters of the components used in the RF link. It should be understood that the RF link mentioned in the modeling process includes various components involved in the correction process that have a great impact on the link phase shift, not just the correction network and the transceiver channel. In the specific implementation, it is necessary to model each component in the RF link, including the correction network and the transceiver channel, so as to obtain a two-port network model and determine the transmission line model matrix S of the entire RF link. The specific determination method of the transmission line model matrix S is as follows:

[0100] Figure 3 This is a schematic diagram of a two-port network model of any two components in the radio frequency link in the real-time multi-channel calibration method for a millimeter wave transceiver provided in this application. i and I i(i=0, 1 and 2) are the voltage and current of the two transmission lines at the corresponding positions. i + and V i - is the incident voltage and the reflected voltage (V i =V i + +V i - ), while I i + and I i - is the incident current and the reflected current (I i =I i + +I i - ), Z0 is the characteristic impedance, S (n) and T (n) (n=1 or 2) are the scattering matrix and the transfer matrix respectively. Figure 3 The two-port network model shown determines the scattering matrix S (n) as follows:

[0101]

[0102] in, is the loss coefficient of the component to which component 1 or 2 belongs, l n is the effective transmission line length of the element to which component 1 or 2 belongs, and β is the propagation constant. It should be understood that since the transceiver link is mutual, S 21 =S 12 .

[0103] According to the transfer matrix T (n) and the scattering matrix S (n) The corresponding relationship between (n) as follows:

[0104]

[0105] According to the transfer matrix T of component 1 (1) The transfer matrix T of component 2 (2) The transfer matrix T used to characterize the amplitude and phase can be determined. The calculation formula of the transfer matrix T is as follows:

[0106] T=T (1) ·T (2)

[0107] The determined transmission matrix T is as follows:

[0108]

[0109] in,

[0110] Finally, according to the corresponding relationship between the transmission line model matrix S and the transmission matrix T, the transmission line model matrix S is determined by the transmission matrix T.

[0111] In step S202, according to the parameters S in the transmission line model matrix S 11 The magnitude of the amplitude determines whether the two RF links used for modeling are reflection-free or reflection-ignorable circuits. Specifically, if the parameter S in the transmission line model matrix S 11 If the amplitude of is less than the preset threshold, it is determined that the reflection of the two RF links can be ignored, thereby determining that the transceiver meets the amplitude and phase correction condition; if the parameter S in the transmission line model matrix S 11 If the amplitude of is greater than or equal to the preset threshold, it is determined that the reflections of the two RF links cannot be ignored, thereby determining that the transceiver does not meet the amplitude and phase correction conditions. 11 The preset threshold of the amplitude can be -15 dB or -20 dB.

[0112] Specifically, the transmission line model matrix S calculated for two RF links with no reflection or negligible reflection is as follows:

[0113]

[0114] According to the above formula, it can be inferred that, in essence, for a RF link with no reflection or negligible reflection, the transmission line model matrix S of any two components can be directly calculated by multiplying two independent scattering matrices. Furthermore, for a RF link with no reflection or negligible reflection, the calculation of the total S parameter, amplitude, and phase is as follows:

[0115]

[0116] Among them, S 21 The phase of the parameter indicates that when S 11 The phase shift of the component when it is low enough, S 21 The magnitude of a parameter represents the magnitude of the component.

[0117] It can be determined that when the RF link in the transceiver has no reflection or the reflection can be ignored, that is, when the amplitude and phase correction conditions are met, it is reasonable to compare the phase difference of two components at the same position of the RF link, and the phase difference of the two components can be added or subtracted for calculation.

[0118] In the specific application implementation of this solution, it should be understood that if a certain transceiver can meet the preset amplitude and phase conditions, then the transceiver can apply this correction method, and can perform the correction network test experiment and correction accuracy verification experiment in the present invention.

[0119] Figure 4 A flow chart of the second embodiment of the real-time multi-channel calibration method for a millimeter wave transceiver provided in this application. This calibration network test experiment is mainly used in millimeter wave transceivers in the aforementioned application scenarios. Before performing amplitude and phase calibration on multiple channels, it is necessary to obtain the amplitude difference and phase difference between the calibration networks corresponding to any two channels. The calibration method also includes:

[0120] S301: When the transceiver meets the preset amplitude and phase correction conditions, a test environment is constructed, which includes: a vector network analyzer, one end of the vector network analyzer is connected to a horn antenna, and the other end is connected to the transceiver, wherein the horn antenna is aligned with the center of any phased array antenna PAA in the transceiver, and the test environment is a microwave darkroom environment.

[0121] In this scheme, the purpose of conducting the correction network test experiment is to obtain the amplitude difference and phase difference between the correction networks corresponding to any two channels, so as to remove the amplitude difference and phase difference between the correction networks implied in the amplitude difference and phase difference between any two channels obtained in the real-time correction process, thereby obtaining correction data that only contains the amplitude difference and phase difference between any two transmitting and receiving channels, reducing the difficulty of correction network design and improving correction accuracy.

[0122] In this step, the method for determining the amplitude and phase correction conditions described above is used to determine whether the transceiver meets the preset amplitude and phase correction conditions. If the transceiver meets the preset amplitude and phase correction conditions, it is determined that the transceiver can perform the correction network test experiment in this solution. After determining that the transceiver meets the preset amplitude and phase correction conditions, a correction network test environment is constructed.

[0123] Figure 5 A schematic diagram of the calibration network test environment in the real-time multi-channel calibration method for a millimeter wave transceiver provided in this application, such as Figure 5 As shown, specifically, the experimental equipment is placed in a microwave darkroom, one end of the vector network analyzer is connected to the horn antenna, and the other end is connected to the ultra-small push-in SMP port of the transceiver, and the horn antenna is aligned with the center of any phased array antenna PAA in the transceiver. The line connecting the correction source component to the correction network is disconnected to construct a closed loop of the vector network analyzer, the horn antenna, and the correction network. The SMP port is a port designed at the beginning of the transceiver for the correction network test experiment, which can input the correction signal from the vector network analyzer to the PAA system, or output the signal received by the PAA to the vector network analyzer.

[0124] S302: Control the vector network analyzer to send a correction signal, the correction signal passes through the correction network corresponding to the PAA, and the vector network analyzer detects a detection signal returned through the correction network.

[0125] In this step, after the test environment is constructed, the correction network test experiment can be started. In the correction network test experiment, the vector network analyzer sends a correction signal and compares the correction signal with the detection signal returned after passing through the correction network to obtain S parameters.

[0126] In the specific application implementation of the present solution, it should be understood that during the correction network test process, since only the amplitude difference and phase difference of the correction network corresponding to the channel are tested, the line connecting the transceiver channel and the correction network needs to be disconnected before the test so that the correction signal does not pass through the transceiver channel. Therefore, the channel in the transceiver and the correction network cannot be regarded as being in the same RF link.

[0127] In the specific application implementation of this solution, it should be understood that the present application does not limit the type of the correction signal sent by the vector network analyzer. The signal can actually be any signal that can be used for correction.

[0128] S303: Determine the amplitude and phase of the correction network corresponding to the channel including the PAA according to the correction signal and the detection signal.

[0129] In this step, the vector network analyzer can determine the S parameters based on the correction signal and the detection signal. The S parameters include the amplitude and phase of the correction network corresponding to each channel in the transceiver. Thus, the amplitude and phase of the correction network corresponding to each channel in the transceiver can be obtained to obtain the amplitude difference and phase difference between the correction networks corresponding to any two channels.

[0130] In the specific application implementation of this solution, it should be understood that in the correction network test experiment, the vector network analyzer sends a correction signal, and determines the amplitude and phase of the correction network corresponding to the channel based on the correction signal and the detection signal returned through the correction network. For example, the correction signal can be transmitted from the input port of the vector network analyzer to the output port: the correction signal is sent from the input port of the vector network analyzer, and the signal passes through the correction network through the phase shifter to the PAA, and the horn antenna receives the radiation wave of the near-field PAA. Finally, the signal is returned to the output port of the vector network analyzer through the coaxial line between the horn and the vector network analyzer. As a result, the vector network analyzer obtains the S parameter S that characterizes the amplitude and phase of the correction network in each RF link. 21 As another example, the correction network can also be transmitted from the output port of the vector network analyzer to the input port: the output port of the vector network analyzer sends the correction signal, the PAA receives the radiation wave of the near-field horn antenna, the signal passes through the phase shifter and then passes through the correction network, and finally, the signal returns to the input port of the vector network analyzer through the SMP. Thus, the vector network analyzer obtains the S parameter S that characterizes the amplitude and phase of the correction network in each RF link. 12 .

[0131] In the specific application implementation of this solution, it should be understood that the horn antenna in this experiment is aimed at the center of a PAA system in the transceiver. Therefore, a correction network test process can only obtain the amplitude and phase of the correction network corresponding to the channel containing the PAA. In order to obtain the amplitude and phase of the correction network corresponding to all channels, it is necessary to change the position of the horn antenna to align it with the center of the next PAA to obtain the amplitude and phase of the correction network corresponding to the channel containing the next PAA. Therefore, it is necessary to continuously change the position of the horn antenna and circulate the test experiment until the amplitude and phase of the correction network corresponding to all channels are obtained.

[0132] In the specific application of this solution, it should be understood that the S parameters obtained by the vector network analyzer include the phase shift θ of the correction network corresponding to the channel in the transceiver. calib , which also includes the phase shift θ between the horn antenna and the PAA system antenna array air The phase shift θ of the phase shifter in the PAA system PS For example, after the correction network test experiment is performed on the i-th channel, S 21 The phase can be expressed as:

[0133]

[0134] in, represents the phase shift of the correction network corresponding to the i-th channel.

[0135] The PAA systems used by the transceivers are exactly the same, so it can be assumed that all the phase shifters contained in the PAA system are almost the same. Therefore, it can be assumed that the phase shift caused by the phase shifters in different PAA systems is θ PS When testing, the same horn antenna is used to point to the center of different PAA systems, and the distance between the horn antenna and different PAAs needs to remain almost unchanged during each measurement. This rigorous experimental operation can ensure that the phase shift θ from the horn antenna to the PAA system is the same in each measurement. air can be ignored, that is, θ in the above formula air The parameters are unchanged.

[0136] S304: Calculate the amplitude difference and phase difference between the correction networks corresponding to any two channels according to the amplitude and phase of the correction network corresponding to each channel.

[0137] In this step, the server can calculate the amplitude difference and phase difference between the correction networks corresponding to any two channels based on the amplitude and phase of the correction network corresponding to each channel in the transceiver obtained by the vector network analyzer test, and then determine the correction data used to compensate each channel based on the amplitude difference and phase difference between any two channels and the amplitude difference and phase difference between the correction networks corresponding to any two channels obtained in this step.

[0138] In the specific application implementation of this solution, it should be understood that after the correction network test experiment is performed on different channels, the S corresponding to different channels can be obtained. 21 , where S corresponding to different channels 21 θ PS Parameters and θ air The parameters can be considered the same. Therefore, the calculation formula for the phase difference between the correction networks corresponding to any two channels is as follows:

[0139]

[0140] in, is the S obtained by the calibration network test experiment for the i-th channel 21 The phase of is the S obtained by the calibration network test experiment for the jth channel 21 The phase of is the phase shift of the correction network corresponding to the channel in the i-th channel, is the phase shift of the correction network corresponding to the channel in the jth channel. Wherein, the i-th channel is any channel among all channels, and the j-th channel is any channel among all channels except the i-th channel.

[0141] After the above data processing, the phase difference between the calibration networks corresponding to any two channels can be obtained. It should be understood that the above-mentioned method for determining the phase difference is also applicable to the determination of the amplitude difference. Therefore, the relevant method for determining the amplitude difference will not be repeated in this embodiment.

[0142] In the specific application implementation of this solution, it should be understood that repeated experiments should be carried out to judge the accuracy of the measured data of the correction network test experiment. It should be noted that the influence of temperature should be considered in the process of repeated experiments. The influence of temperature drift on amplitude is small and can be ignored to a certain extent, but the influence on phase is very large. Therefore, in each measurement process, the ambient temperature needs to be kept almost the same. This solution provides three methods for judging the accuracy of the measurement. Specifically, method one is to measure S at different frequencies under constant ambient temperature. 21 Parameters, compare the consistency of the measurement results; Method 2 is to measure the S of the same frequency multiple times under the condition of constant ambient temperature. 21Parameters, compare the consistency of the measurement results; Method 3 is to measure S at the same frequency under constant ambient temperature. 21 Parameters and S 12 Parameters, according to the reciprocity theorem to compare the consistency of the measurement results. In the process of accuracy judgment, the above three methods can be combined with each other or used separately, and can be flexibly selected in practical applications. For example, the S of the same frequency can be measured multiple times. 21 Parameters and S 12 The parameters are calculated and the average values ​​are calculated respectively, and the consistency of the two average values ​​is compared. If the two average values ​​are almost the same, it is judged that the measurement data of the correction network test experiment is accurate.

[0143] In the specific application implementation of this solution, it should be understood that the amplitude difference and phase difference between the correction networks corresponding to any two channels determined by the vector network analyzer can be regarded as an accurate and reusable data. During the real-time correction process, the server can retrieve this data as needed.

[0144] In the specific application implementation of this solution, it should be understood that any two channels compared in the correction network test experiment are the same as the channels included in any two radio frequency links compared in the real-time correction process.

[0145] In the real-time multi-channel calibration method for a millimeter wave transceiver provided in this embodiment, before real-time calibration is performed, the amplitude difference and phase difference between the calibration networks corresponding to any two channels are obtained in advance through a calibration network test experiment, a test environment is first set up, and then a vector network analyzer sends a calibration signal, and the amplitude and phase of the calibration network in the RF link are determined based on the calibration signal and the detection signal returned by the calibration network. Therefore, in this calibration method, the calibration network can replace the precisely designed calibration network with a preliminary designed calibration network, and the amplitude difference and phase difference between the calibration networks corresponding to any two channels obtained in advance through a calibration network test experiment before real-time calibration eliminates the amplitude difference and phase difference between the calibration networks implicit in the calibration data, thereby achieving the effect of reducing the difficulty of calibration network design and improving calibration accuracy.

[0146] Figure 6 This is a flow chart of the third embodiment of the real-time multi-channel calibration method for a millimeter wave transceiver provided in this application; this calibration data verification experiment is mainly used in the millimeter wave transceiver of the aforementioned application scenario. During the real-time calibration process of the transceiver, a verification environment can be set up at any time to verify the calibration data in the transceiver. The calibration method provided in this application may also include:

[0147] S401: Construct a verification environment, which includes: a signal generator, wherein the signal generator is connected to a horn antenna, and the horn antenna is aligned with the center of any phased array antenna PAA in the transceiver, and the verification environment is a microwave darkroom environment.

[0148] In this solution, the purpose of verifying the correction data is to verify the accuracy and precision of the correction. This solution infers the accuracy of the correction data used for compensation of each channel by verifying the accuracy of the amplitude difference and phase difference between any two RF links obtained in the real-time correction process and the amplitude difference and phase difference between the correction networks corresponding to any two channels obtained in the correction network test experiment, thereby verifying the accuracy of the correction method provided by this application.

[0149] In this step, you need to build a verification environment for data verification experiments. Figure 7 A schematic diagram of a correction data verification environment in the real-time multi-channel correction method for a millimeter wave transceiver provided in this application, such as Figure 7 As shown, the experimental equipment is placed in a microwave darkroom, the signal generator is connected to the horn antenna, and the horn antenna is aligned with the center of any phased array antenna PAA in the transceiver. In addition, the line belonging to the correction network needs to be disconnected to ensure that the entire receiving channel is not interfered by the correction network.

[0150] S402: The control signal generator transmits a signal, and the signal enters a channel corresponding to the PAA.

[0151] In this step, the signal generator is controlled to transmit the signal, the PAA receives the radiation wave of the near-field horn antenna, and the signal enters the channel after passing through the phase shifter. The signal is converted into digital data by the digital-to-analog converter ADC in the SOC, and the digital data can be transmitted to the server through the FIFO. The amplitude and phase of the channel corresponding to the PAA system can be detected on the server side.

[0152] In the specific application implementation of this solution, it should be understood that the signal generator is connected to the horn antenna to send electromagnetic waves to each PAA system. The signal generator is used to simulate the echo signal reflected by the object detected by the transmitter. The purpose of using the signal generator instead of the transmitter to transmit directly is to ensure that the signal transmitted by the horn antenna is aligned with the center position of the receiver channel, so as to facilitate subsequent data processing to eliminate the air interface differences of the echo signals received by different PAA systems. Among them, the echo signal radiates into the channel and finally returns to the ADC.

[0153] S403: Determine the amplitude and phase of the channel according to the output signal output from the receiving channel.

[0154] In this step, after the signal enters the channel in the RF link, it enters the digital-to-analog converter ADC in the SOC and is converted into digital data. The digital data can be transmitted to the server through the FIFO, and the amplitude and phase of the channel corresponding to the PAA system can be detected on the server side.

[0155] In the specific application implementation of this solution, it should be understood that the horn antenna in this experiment is aimed at the center of a PAA system in the transceiver. Therefore, a calibration data verification process can only obtain the amplitude and phase of the channel containing the PAA. In order to obtain the amplitude and phase of all channels, it is necessary to change the position of the horn antenna to align it with the center of the next PAA to obtain the amplitude and phase of the channel containing the next PAA. Therefore, it is necessary to continuously change the position of the horn antenna and repeat the test experiment until the amplitude and phase of all channels are obtained.

[0156] In the specific application implementation of this solution, it should be understood that the phase shift of the entire link in this experiment is mainly affected by the channel and the air interface between the horn antenna and the PAA. The relationship of the phase shift is expressed as follows:

[0157]

[0158] in, is the phase shift of the entire link, is the phase shift from the horn antenna to the PAA system,

[0159] is the phase shift of the channel.

[0160] S404: Determine the amplitude difference and phase difference between any two channels according to the amplitude and phase of each channel in the receiver.

[0161] In this step, the server can determine the amplitude difference and phase difference between any two channels based on the amplitude and phase of all channels detected. This data can be used to determine the accuracy of the amplitude difference and phase difference between any two channels obtained in the real-time correction process and the amplitude difference and phase difference between the correction networks corresponding to any two channels obtained in the correction network test experiment.

[0162] In the specific application of this solution, it should be understood that when the speaker port is aligned with the center position of all PAA systems to be tested, the air port difference of the left and right PAA systems with symmetry on the central axis can be considered to be the same. Therefore, the calculation formula for the amplitude difference and phase difference between the jth channel and the ith channel is as follows:

[0163]

[0164] in, Only the amplitude and phase differences between any two channels are included.

[0165] S405: Perform calibration accuracy verification based on the amplitude difference and phase difference between any two RF links in which the calibration network is set during the calibration process, the amplitude difference and phase difference between any two channels, and the amplitude difference and phase difference between any two calibration networks.

[0166] In this step, the server can verify the correction accuracy based on the amplitude difference and phase difference between any two RF links of the correction network set during the correction process, the amplitude difference and phase difference between any two transceiver channels, and the amplitude difference and phase difference between the correction networks corresponding to any two channels and 0.

[0167] The specific data involved are as follows:

[0168]

[0169] Among them, Δθ is the amplitude difference and phase difference between the correction networks corresponding to any two channels obtained from the correction network test experiment, It is the amplitude difference and phase difference between any two RF links with the correction network set up obtained in the real-time correction process, and Δα is the amplitude difference between any two channels obtained in the data verification experiment.

[0170] In the specific application implementation of this solution, it should be understood that when there is the following formula:

[0171]

[0172] This means that the amplitude difference and phase difference between any two RF links with the correction network set obtained in the real-time correction process are accurate to the amplitude difference and phase difference between any two channels corresponding to the correction network obtained in the correction network test experiment. Thus, the accuracy of the correction data used for compensation of each channel is determined.

[0173] In the specific application implementation of this solution, it should be understood that the above-mentioned method for determining the phase difference is also applicable to the determination of the amplitude difference. Therefore, the relevant method for determining the amplitude difference will not be repeated in this embodiment.

[0174] In the specific application implementation of this solution, it should be understood that any two channels compared in the correction data verification experiment are the same as any two channels compared in the correction network test experiment and the channels included in any two RF links compared in the real-time correction process.

[0175] In the real-time multi-channel calibration method for a millimeter-wave transceiver provided in this embodiment, during the real-time calibration process of the transceiver, a verification environment can be set up at any time to verify the calibration data in the transceiver. First, a test environment is set up so that the horn antenna in the test environment is aligned with the center of a PAA system. During the verification of the calibration data, the signal generator transmits a signal, and then the signal enters the channel corresponding to the PAA. According to the output signal output from the channel, the amplitude and phase of the channel can be determined, and the server can obtain the amplitude difference and phase difference between any two channels after data processing, and perform calibration accuracy verification based on the data obtained by the real-time calibration, the data obtained by the calibration network test experiment, and the data obtained by the calibration data verification experiment. In this process, the signal source formed can control the direction of signal transmission by adjusting the position of the horn antenna. Different from the traditional method of using a transmitter to transmit and using an angle reflector to make the signal reach the receiver, this solution can make the horn antenna align with the center position of all PAA systems of the receiver to send signals, so that the air interface differences between the PAA systems can be directly eliminated.

[0176] Based on the real-time multi-channel calibration method for a millimeter wave transceiver provided in any of the above embodiments, the present solution is illustrated below by means of a specific example. Figure 8 This is a flow chart of the fourth embodiment of the real-time multi-channel calibration method for a millimeter wave transceiver provided in this application. Figure 8 As shown, the correction method implementation steps are as follows:

[0177] S501: Establish a two-port network model based on characteristic parameters of components used in the transceiver, and determine whether the transceiver meets preset amplitude and phase correction conditions.

[0178] S502: If the transceiver meets the preset amplitude and phase correction conditions, the correction network that is only preliminarily designed is tested to obtain the amplitude difference and phase difference between the correction networks corresponding to any two channels.

[0179] S503: The transceiver enters a real-time calibration process, during which the server connected to the transceiver detects and obtains the amplitude and phase of multiple RF links of the transceiver, and obtains the amplitude difference and phase difference between any two RF links through data processing. Finally, according to the amplitude difference and phase difference between any two RF links and the amplitude difference and phase difference between the correction networks corresponding to any two channels obtained in advance, the multiple channels are calibrated in amplitude and phase.

[0180] S504: Perform a calibration data verification experiment to verify calibration accuracy.

[0181] Fig. 9 The schematic diagram of the structure of the real-time multi-channel calibration device for the millimeter wave transceiver provided in this application is as follows: Fig. 9As shown, the millimeter wave transceiver real-time multi-channel calibration device 60 provided in this embodiment includes:

[0182] The detection module 601 is used to detect and obtain the amplitude and phase of multiple radio frequency links of the transceiver, each radio frequency link includes a correction network and a channel;

[0183] The processing module 602 is used to obtain the amplitude difference and phase difference between any two radio frequency links according to the amplitudes and phases of the multiple radio frequency links;

[0184] The correction module 603 is used to perform amplitude and phase correction on multiple channels according to the amplitude difference and phase difference between any two RF links and the pre-acquired amplitude difference and phase difference between the correction networks corresponding to any two channels.

[0185] The millimeter wave transceiver real-time multi-channel calibration device provided in this embodiment can execute the method provided in the above method embodiment. Its implementation principle and technical effect are similar, and this embodiment will not be described in detail here.

[0186] Based on the above-mentioned embodiment of the millimeter wave transceiver real-time multi-channel calibration device 60, in a specific implementation manner, before performing amplitude and phase calibration on multiple channels according to the amplitude difference and phase difference between any two RF links and the pre-acquired amplitude difference and phase difference between the calibration networks corresponding to any two channels, the millimeter wave transceiver real-time multi-channel calibration device 60 may further include:

[0187] A testing module 604 is used to obtain the amplitude and phase of the correction network corresponding to each channel in the transceiver obtained by testing with a vector network analyzer;

[0188] The calculation module 605 calculates the amplitude difference and phase difference between the correction networks corresponding to any two channels according to the amplitude and phase of the correction network corresponding to each channel.

[0189] Based on the above-mentioned embodiment of the millimeter wave transceiver real-time multi-channel calibration device 60, before the amplitude difference and phase difference between the calibration networks corresponding to any two channels are pre-acquired, the millimeter wave transceiver real-time multi-channel calibration device 60 further includes:

[0190] A judgment module 606 is used to model any two radio frequency links according to characteristic parameters of components used in the radio frequency links in the transceiver to obtain a two-port network model;

[0191] Based on the two-port network model, determining whether reflections of the two radio frequency links can be ignored;

[0192] If the reflections of the two radio frequency links are negligible, it is determined that the transceiver meets the amplitude and phase correction condition; otherwise, it is determined that the transceiver does not meet the amplitude and phase correction condition.

[0193] Based on the above-mentioned embodiment of the millimeter wave transceiver real-time multi-channel calibration device 60, during the real-time calibration process, a calibration data verification experiment can be performed at any time. The millimeter wave transceiver real-time multi-channel calibration device 60 further includes:

[0194] The verification module 607 is used to build a verification environment, which includes: a signal generator, the signal generator is connected to a horn antenna, the horn antenna is aligned with the center of any phased array antenna PAA in the transceiver, and the verification environment is a microwave darkroom environment;

[0195] Controlling the signal generator to transmit a signal, and the signal enters a channel corresponding to the PAA;

[0196] Determining the amplitude and phase of the channel based on the output signal from the receiving channel;

[0197] Determining the amplitude difference and phase difference between any two channels according to the amplitude and phase of each channel in the receiver;

[0198] The calibration accuracy is verified based on the amplitude difference and phase difference between any two RF links in which the calibration network is set during the calibration process, the amplitude difference and phase difference between any two channels, and the amplitude difference and phase difference between any two calibration networks.

[0199] The millimeter wave transceiver real-time multi-channel calibration device provided in this embodiment can execute the method provided in the above method embodiment. Its implementation principle and technical effect are similar, and this embodiment will not be described in detail here.

[0200] In a possible implementation, in order to implement amplitude and phase correction for multiple channels according to the amplitude difference and phase difference between any two RF links and the amplitude difference and phase difference between the correction networks corresponding to any two channels obtained in advance, the correction module 603 is specifically used to:

[0201] Subtract the amplitude difference between the first channel and the second channel obtained in advance from the amplitude difference between the first RF link and the second RF link, so as to complete the amplitude correction between the first channel and the second channel;

[0202] Subtract the phase difference between the correction network corresponding to the first channel and the correction network corresponding to the second channel obtained in advance from the phase difference between the first radio frequency link and the second radio frequency link, so as to complete the phase correction between the first channel and the second channel;

[0203] The first RF link is any RF link among the multiple RF links, the second RF link is any link among the multiple RF links except the first RF link, the first channel is the channel included in the first RF link, and the second channel is the channel included in the second RF link.

[0204] In a possible implementation, in order to obtain the amplitude and phase of the correction network corresponding to each channel in the transceiver obtained by testing with a vector network analyzer, the testing module 604 is specifically used to:

[0205] When the transceiver meets the preset amplitude and phase correction conditions, a test environment is constructed, wherein the test environment includes: a vector network analyzer, one end of the vector network analyzer is connected to a horn antenna, and the other end is connected to the transceiver, the horn antenna is aligned with the center of any phased array antenna PAA in the transceiver, and the test environment is a microwave darkroom environment;

[0206] Controlling the vector network analyzer to send a correction signal, the correction signal passes through a correction network corresponding to the PAA, and detecting a detection signal returned by the correction network through the vector network analyzer;

[0207] The amplitude and phase of the correction network corresponding to the channel including the PAA are determined according to the correction signal and the detection signal.

[0208] The millimeter wave transceiver real-time multi-channel calibration device provided in this embodiment can execute the method provided in the above method embodiment. Its implementation principle and technical effect are similar, and this embodiment will not be described in detail here.

[0209] Fig.10 This is a schematic diagram of the structure of the millimeter wave transceiver real-time multi-channel correction system provided in this application. Fig.10 As shown, the millimeter wave transceiver real-time multi-channel calibration system 70 provided in this embodiment includes: a server 701, and a millimeter wave transceiver 702 connected to the server, wherein the millimeter wave transceiver is provided with a calibration source 703 and a calibration network 704.

[0210] In the specific implementation process, the server is used to execute the millimeter wave transceiver real-time multi-channel calibration method described in the above method embodiment.

[0211] Fig.11 This is a schematic diagram of the structure of the millimeter wave transceiver real-time multi-channel test system provided in this application. Fig.11As shown, the millimeter wave transceiver real-time multi-channel test system 80 provided in this embodiment includes: a vector network analyzer 801, one end of the vector network analyzer is connected to the horn antenna 802, and the other end is connected to the transceiver 702, the horn antenna is aligned with the center of any phased array antenna PAA803 in the transceiver, and the test system is in a microwave darkroom environment.

[0212] In the specific implementation process, the vector network analyzer is used to send a correction signal, the correction signal passes through the correction network corresponding to the PAA, and the detection signal returned by the correction network is detected by the vector network analyzer. The correction signal and the detection signal are used to determine the amplitude and phase of the correction network corresponding to the channel including the PAA.

[0213] Fig.12 This is a schematic diagram of the structure of the millimeter wave transceiver real-time multi-channel verification system provided in this application. Fig.12 As shown, the millimeter wave transceiver real-time multi-channel verification system 90 provided in this embodiment includes: a signal generator 901, the signal generator is connected to the horn antenna 802, the horn antenna is aligned with the center of any phased array antenna PAA803 in the transceiver 702, and the verification system is in a microwave darkroom environment.

[0214] In a specific implementation process, the signal generator is used to transmit a signal, the signal enters a channel corresponding to the PAA, and the output signal output from the channel is used to determine the amplitude and phase of the channel.

[0215] Finally, it should be noted that those skilled in the art will readily conceive of other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses or adaptations of the present invention, which follow the general principles of the present invention and include common knowledge or customary technical means in the art not disclosed by the present invention, are not limited to the precise structure described above and shown in the drawings, and may be modified and changed in various ways without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A millimeter wave transceiver real-time multi-channel calibration method, characterized in that: include: Detecting and acquiring the amplitude and phase of multiple radio frequency links of the transceiver, each radio frequency link including a correction network and a channel; According to the amplitudes and phases of the multiple radio frequency links, respectively obtaining an amplitude difference and a phase difference between any two radio frequency links; Amplitude and phase correction is performed on multiple channels according to the amplitude difference and phase difference between any two radio frequency links and the amplitude difference and phase difference between the correction networks corresponding to any two channels acquired in advance.

2. The method according to claim 1, characterized in that The method of performing amplitude and phase correction on multiple channels according to the amplitude difference and phase difference between any two radio frequency links and the amplitude difference and phase difference between the correction networks corresponding to any two channels obtained in advance comprises: Subtract the amplitude difference between the first channel and the second channel obtained in advance from the amplitude difference between the first RF link and the second RF link, so as to complete the amplitude correction between the first channel and the second channel; Subtract the phase difference between the correction network corresponding to the first channel and the correction network corresponding to the second channel obtained in advance from the phase difference between the first radio frequency link and the second radio frequency link, so as to complete the phase correction between the first channel and the second channel; The first RF link is any RF link among the multiple RF links, the second RF link is any link among the multiple RF links except the first RF link, the first channel is the channel included in the first RF link, and the second channel is the channel included in the second RF link.

3. The method according to claim 1 or 2, characterized in that: Before performing amplitude and phase correction on multiple channels according to the amplitude difference and phase difference between any two RF links and the amplitude difference and phase difference between the correction networks corresponding to any two channels acquired in advance, the method further includes: Acquire the amplitude and phase of the correction network corresponding to each channel in the transceiver obtained by testing with a vector network analyzer; According to the amplitude and phase of the correction network corresponding to each channel, the amplitude difference and phase difference between the correction networks corresponding to any two channels are calculated.

4. The method according to claim 3, characterized in that The obtaining of the amplitude and phase of the correction network corresponding to each channel in the transceiver obtained by testing with a vector network analyzer includes: When the transceiver meets the preset amplitude and phase correction conditions, a test environment is constructed, wherein the test environment includes: a vector network analyzer, one end of the vector network analyzer is connected to a horn antenna, and the other end is connected to the transceiver, the horn antenna is aligned with the center of any phased array antenna PAA in the transceiver, and the test environment is a microwave darkroom environment; Controlling the vector network analyzer to send a correction signal, the correction signal passes through a correction network corresponding to the PAA, and detecting a detection signal returned by the correction network through the vector network analyzer; The amplitude and phase of the correction network corresponding to the channel including the PAA are determined according to the correction signal and the detection signal.

5. The method according to claim 4, characterized in that The method further comprises: Modeling any two radio frequency links according to characteristic parameters of components used in the radio frequency link in the transceiver to obtain a two-port network model; Based on the two-port network model, determining whether reflections of the two radio frequency links can be ignored; If the reflections of the two radio frequency links are negligible, determining that the transceiver meets the amplitude and phase correction condition; Otherwise, it is determined that the transceiver does not meet the amplitude and phase correction condition.

6. The method according to claim 4 or 5, characterized in that: The method further comprises: Constructing a verification environment, wherein the verification environment includes: a signal generator, wherein the signal generator is connected to a horn antenna, wherein the horn antenna is aligned with the center of any phased array antenna PAA in the transceiver, and the verification environment is a microwave darkroom environment; Controlling the signal generator to transmit a signal, and the signal enters a channel corresponding to the PAA; Determining the amplitude and phase of the channel according to the output signal output from the channel; Determining the amplitude difference and phase difference between any two channels according to the amplitude and phase of each channel in the receiver; The calibration accuracy is verified based on the amplitude difference and phase difference between any two RF links in which the calibration network is set during the calibration process, the amplitude difference and phase difference between any two channels, and the amplitude difference and phase difference between the calibration networks corresponding to any two channels.

7. A millimeter wave transceiver real-time multi-channel calibration device, characterized in that: include: A detection module, used to detect and obtain the amplitude and phase of multiple radio frequency links of the transceiver, each radio frequency link including a correction network and a channel; A processing module, configured to obtain an amplitude difference and a phase difference between any two radio frequency links according to the amplitudes and phases of the plurality of radio frequency links; The correction module is used to perform amplitude and phase correction on multiple channels according to the amplitude difference and phase difference between any two radio frequency links and the amplitude difference and phase difference between the correction networks corresponding to any two channels acquired in advance.

8. A millimeter wave transceiver real-time multi-channel calibration system, characterized in that: include: A server, and a millimeter wave transceiver connected to the server, wherein the millimeter wave transceiver is provided with a correction source and a correction network; Wherein, the server is used to execute the real-time multi-channel calibration method of the millimeter wave transceiver as described in any one of claims 1 to 6.

9. A millimeter wave transceiver real-time multi-channel test system, characterized in that: include: A vector network analyzer, one end of the vector network analyzer is connected to a horn antenna and the other end is connected to the transceiver, the horn antenna is aligned with the center of any phased array antenna PAA in the transceiver, and the test system is in a microwave darkroom environment; The vector network analyzer is used to send a correction signal, the correction signal passes through the correction network corresponding to the PAA, and the detection signal returned by the correction network is detected by the vector network analyzer. The correction signal and the detection signal are used to determine the amplitude and phase of the correction network corresponding to the channel including the PAA.

10. A millimeter wave transceiver real-time multi-channel verification system, characterized in that: include: A signal generator, wherein the signal generator is connected to a horn antenna, the horn antenna is aligned with the center of any phased array antenna PAA in the transceiver, and the verification system is in a microwave darkroom environment; The signal generator is used to transmit a signal, the signal enters a channel corresponding to the PAA, and the output signal output from the channel is used to determine the amplitude and phase of the channel.

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