Multi-channel Signal Source Phase Calibration Method and System

Abstract

Embodiments of the present disclosure disclose a multi-channel signal source phase calibration method and system. Among them, the method includes: receiving multiple original signals output by a multi-channel signal source and dividing them into a reference group and a control group; obtaining the phase difference between the original signals by selecting original signals from the reference group and the control group and performing signal processing, and performing phase calibration on the multi-channel signal source based on the phase difference; wherein, the signal processing includes: performing signal decimation on the original signals selected from the reference group and the control group to obtain a reference signal and a control signal; performing mixing processing on the reference signal and the control signal to obtain an intermediate frequency signal; performing voltage extraction on the intermediate frequency signal to obtain a first voltage signal; obtaining a first voltage value of the first voltage signal; and obtaining the phase difference based on the first voltage value. This method can perform efficient and accurate phase calibration on a multi-channel signal source through signal processing and phase difference calculation, improving the system stability.

Description

Technical Field

[0001] The present disclosure relates to the technical field of signal processing, and in particular, to a multi-channel signal source phase calibration method and system. Background Art

[0002] The interferometer direction finding system is one of the most commonly used equipments in electronic reconnaissance. During its development, it is necessary to generate multiple radio frequency signals with phase differences for excitation and testing. The interferometer direction finding system belongs to the phase method direction finding system. It mainly utilizes the fact that when radio waves arrive at the direction finding antenna array, due to the different spatial positions of different antennas, the phases of the signals received by each antenna unit are different. By measuring the phase differences of the incoming wave on each array element, the direction of the incoming wave can be solved.

[0003] However, if the relative phases between the multiple radio frequency signals with phase differences output by the multi-channel signal source are unstable, it will seriously affect the effectiveness evaluation of the interferometer direction finding system. Summary of the Invention

[0004] In view of this, the embodiments of the present disclosure provide a multi-channel signal source phase calibration method and system, which can perform efficient and accurate phase calibration on the multi-channel signal source through signal processing and phase difference calculation, and improve the system stability.

[0005] In a first aspect, the embodiments of the present disclosure provide a multi-channel signal source phase calibration method, adopting the following technical solutions:

[0006] Receive multiple original signals output by the multi-channel signal source and divide them into a reference group and a control group;

[0007] By selecting original signals from the reference group and the control group and performing signal processing, obtain the phase difference between the original signals, and perform phase calibration on the multi-channel signal source based on the phase difference;

[0008] Wherein, the signal processing includes:

[0009] Perform signal extraction on the original signals selected from the reference group and the control group to obtain a reference signal and a control signal;

[0010] Perform mixing processing on the reference signal and the control signal to obtain an intermediate frequency signal;

[0011] Perform voltage extraction on the intermediate frequency signal to obtain a first voltage signal;

[0012] Obtain the first voltage value of the first voltage signal;

[0013] Obtain the phase difference based on the first voltage value.

[0014] Optionally, by selecting the original signals from the reference group and the control group, including:

[0015] Select one original signal from the reference group as the standard signal;

[0016] Select one original signal from the control group in sequence as the signal to be adjusted;

[0017] Perform signal processing on the standard signal and the signal to be adjusted to obtain the phase difference between the standard signal and the signal to be adjusted;

[0018] Perform phase calibration on the signal source of the signal to be adjusted based on the phase difference;

[0019] After the phase calibration of the signal source of each original signal in the control group is completed, select one original signal from the control group as the new standard signal;

[0020] Select the remaining original signals from the reference group in sequence as the new signals to be adjusted;

[0021] Perform signal processing on the new standard signal and the new signal to be adjusted to obtain the phase difference between the new standard signal and the new signal to be adjusted;

[0022] Perform phase calibration on the signal source of the new signal to be adjusted based on the new phase difference until the phase calibration of the signal sources of all the remaining original signals in the reference group is completed.

[0023] Optionally, by selecting the original signals from the reference group and the control group, including:

[0024] Taking one original signal in the reference group as the head, set the calibration order;

[0025] In the calibration order, the original signals included in the reference group and the original signals included in the control group are alternately set;

[0026] Take the i-th original signal in the calibration order as the standard signal, where i is initially 1 and 1 ≤ i ≤ I;

[0027] Take the (i + 1)-th original signal in the calibration order as the signal to be adjusted;

[0028] Perform signal processing on the standard signal and the signal to be adjusted to obtain the phase difference between the standard signal and the signal to be adjusted;

[0029] Perform phase calibration on the signal source of the signal to be adjusted based on the phase difference;

[0030] After the phase calibration is completed, increment i by 1, and select the new standard signal and the new signal to be adjusted according to the calibration order until i is equal to I.

[0031] Optionally, by selecting the original signals from the reference group and the control group, it includes:

[0032] Optionally select one of the original signals from the control group as the reference signal;

[0033] According to the signal processing method, obtain the phase difference between each original signal in the reference group and the reference signal, denoted as the first phase difference;

[0034] Select one of the original signals from the reference group as the standard signal, and the remaining original signals in the reference group as the signals to be adjusted;

[0035] Based on the first phase difference, obtain the phase difference between the standard signal and the signals to be adjusted, denoted as the second phase difference;

[0036] Based on the second phase difference, perform phase calibration on the signal source of the signals to be adjusted;

[0037] Sequentially select one of the original signals from the control group as the new signals to be adjusted;

[0038] According to the signal processing method, obtain the phase difference between the standard signal and the new signals to be adjusted, denoted as the third phase difference;

[0039] Based on the third phase difference, perform phase calibration on the signal source of the new signals to be adjusted.

[0040] Optionally, the mixing process of the reference signal and the control signal to obtain the intermediate frequency signal includes:

[0041] Respectively perform power adjustment on the reference signal and the control signal to obtain the first detection signal and the second detection signal;

[0042] Respectively couple the first detection signal and the second detection signal to obtain the first direct signal and the second direct signal;

[0043] Mix the first direct signal and the second direct signal to obtain the intermediate frequency signal.

[0044] Optionally, the expression of the first direct signal is:

[0045] RF(t) = cos(2 *π* f * t +φ1);

[0046] Wherein, RF(t) represents the first direct signal; t represents the signal duration; π represents the pi; φ1 represents the initial phase of the first direct signal;

[0047] The expression of the second direct signal is:

[0048] LO(t) = cos(2 *π* f * t + φ2);

[0049] Wherein, LO(t) represents the second direct signal; φ2 represents the initial phase of the second direct signal;

[0050] The expression of the intermediate frequency signal is:

[0051] IF(t) = RF(t)*LO(t) = (1 / 2)*[cos(4*π* f * t + φ1 + φ2)+cos(φ1 - φ2)];

[0052] Wherein, IF(t) represents the intermediate frequency signal.

[0053] Optionally, the expression of the first voltage signal is:

[0054] V1 = (1 / 2)*cos(φ1 - φ2);

[0055] Wherein, V1 represents the first voltage signal;

[0056] The expression of the first voltage value is:

[0057] v1 = V ref1 *Value1 / 2^ N1 ;

[0058] Wherein, v1 represents the first voltage value; V ref1 represents the reference voltage; Value1 represents the voltage quantization value of the first voltage signal; N1 represents the quantization bit number;

[0059] The expression of the phase difference is:

[0060] △φ = △φ' = φ1 - φ2 = arccos(2* v1);

[0061] Wherein, △φ represents the phase difference between the original signals selected from the reference group and the control group; △φ' represents the phase difference between the first direct signal and the second direct signal.

[0062] Optionally, the multi-channel signal source phase calibration method further includes:

[0063] By coupling the first detection signal and the second detection signal, a first coupling signal and a second coupling signal are obtained;

[0064] Power conversions are respectively performed on the first coupling signal and the second coupling signal to obtain a second voltage signal and a third voltage signal;

[0065] Obtain the second voltage value of the second voltage signal and the third voltage value of the third voltage signal;

[0066] Based on the second voltage value and the third voltage value, obtain the powers of the second voltage signal and the third voltage signal;

[0067] Based on the powers of the second voltage signal and the third voltage signal, adjust the power attenuation amounts required for the reference signal and the comparison signal.

[0068] In a second aspect, an embodiment of the present disclosure further provides a multi-channel signal source phase calibration system, which adopts the following technical solutions:

[0069] The multi-channel signal source phase calibration system includes a plurality of first couplers, two multiplexers, a controller, a mixing module, a low-pass filter, a first analog-to-digital converter, and a serial communication interface;

[0070] The input end of each first coupler is connected to the output end of a signal source of a different channel. The plurality of first couplers are divided into two groups. The output ends of one group of first couplers are connected to the input end of one multiplexer, and the output ends of the other group of first couplers are connected to the input end of the other multiplexer;

[0071] The output ends of the two multiplexers are both connected to the input end of the mixing module, and the two multiplexers are both wirelessly connected to the controller;

[0072] The mixing module, the low-pass filter, the first analog-to-digital converter, and the serial communication interface are connected in sequence, and the serial communication interface is also connected to the control system of the multi-channel signal source.

[0073] Optionally, the mixing module includes two attenuators, two amplifiers, two second couplers, and a mixer;

[0074] The input ends of the two attenuators are respectively connected to the output ends of the two multiplexers. The input ends of the two amplifiers are respectively connected to the output ends of the two attenuators. The output ends of the two second couplers are respectively connected to the output ends of the two amplifiers. The input end of the mixer is connected to the main output ends of the two second couplers. The input end of the low-pass filter is connected to the output end of the mixer.

[0075] Optionally, the multi-channel signal source phase calibration system further includes two detectors, a second analog-to-digital converter, and a third analog-to-digital converter;

[0076] The input ends of the two detectors are respectively connected to the coupled output ends of the two second couplers. The output ends of the two detectors are respectively connected to the input end of the second analog-to-digital converter and the input end of the third analog-to-digital converter;

[0077] The controller is connected to the output ends of the second analog-to-digital converter and the third analog-to-digital converter.

[0078] The multi-channel signal source phase calibration method provided by the embodiments of the present disclosure divides the multiple original signals output by the multi-channel signal source into a reference group and a control group, and performs detailed signal processing, including signal decimation, mixing processing, and voltage extraction. This method can accurately obtain the phase difference between the original signals, and this accurate phase difference measurement provides high-precision data for phase calibration, thereby significantly improving the calibration accuracy. By selecting the original signals and performing specific signal processing steps, the complex multiple manual operation processes in the traditional calibration method are simplified, the possibility of human errors is reduced, and the calibration process is made more efficient and reliable.

[0079] The above description is only an overview of the technical solution of the present disclosure. In order to understand the technical means of the present disclosure more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features, and advantages of the present disclosure more obvious and understandable, the following specifically enumerates preferred embodiments and, in conjunction with the drawings, details are described as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0080] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0081] Figure 1 It is a schematic flow chart of the multi-channel signal source phase calibration method provided by the embodiments of the present disclosure;

[0082] Figure 2 It is a schematic flow chart of the signal processing method provided by the embodiments of the present disclosure;

[0083] Figure 3 It is a schematic circuit diagram of the 8-channel signal source phase calibration provided by the embodiments of the present disclosure;

[0084] Figure 4 It is a schematic flow chart of the method for selecting original signals and performing phase calibration provided by the embodiments of the present disclosure;

[0085] Figure 5 It is another schematic flow chart of the method for selecting original signals and performing phase calibration provided by the embodiments of the present disclosure;

[0086] Figure 6 It is yet another schematic flow chart of the method for selecting original signals and performing phase calibration provided by the embodiments of the present disclosure;

[0087] Figure 7 Schematic flow chart of the mixing processing method provided by the embodiments of the present disclosure;

[0088] Figure 8 Waveform simulation diagram of the 30-degree phase difference between RF and LO provided by the embodiments of the present disclosure;

[0089] Figure 9 Waveform simulation diagram of the intermediate frequency signal provided by the embodiments of the present disclosure;

[0090] Figure 10 Waveform simulation diagram of the first voltage signal provided by the embodiments of the present disclosure;

[0091] Figure 11 Waveform simulation diagram of the 60-degree phase difference between RF and LO provided by the embodiments of the present disclosure;

[0092] Figure 12 Another waveform simulation diagram of the intermediate frequency signal provided by the embodiments of the present disclosure;

[0093] Figure 13 Another waveform simulation diagram of the first voltage signal provided by the embodiments of the present disclosure. Detailed implementation manners

[0094] The embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings.

[0095] It should be clear that the embodiments of the present disclosure are described through specific specific examples below. Those skilled in the art can easily understand other advantages and effects of the present disclosure from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments. The present disclosure can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present disclosure. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present disclosure without creative efforts belong to the scope of protection of the present disclosure.

[0096] It should be noted that the following description relates to various aspects of embodiments within the scope of the appended claims. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is for illustrative purposes only. Based on this disclosure, those skilled in the art should understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of the aspects set forth herein can be used to implement an apparatus and / or practice a method. Additionally, this apparatus can be implemented and this method can be practiced using other structures and / or functionality in addition to one or more of the aspects set forth herein.

[0097] It should also be noted that the diagrams provided in the following embodiments only schematically illustrate the basic concept of this disclosure. The diagrams only show the components related to this disclosure and are not drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and ratio of each component in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0098] In addition, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that the aspects described can be practiced without these specific details.

[0099] Referring to Figure 1 , this disclosure provides a method for phase calibration of a multi-channel signal source, including the following steps:

[0100] S1: Receive multiple raw signals output by a multi-channel signal source and divide them into a reference group and a control group;

[0101] S2: Obtain the phase difference between the raw signals by selecting raw signals from the reference group and the control group and performing signal processing, and perform phase calibration on the multi-channel signal source based on the phase difference.

[0102] Referring to Figure 2 the schematic flowchart of the signal processing method shown, the signal processing method includes the following steps:

[0103] S3: Perform signal extraction on the raw signals selected from the reference group and the control group to obtain a reference signal and a control signal;

[0104] S4: Perform mixing processing on the reference signal and the control signal to obtain an intermediate frequency signal;

[0105] S5: Perform voltage extraction on the intermediate frequency signal to obtain a first voltage signal;

[0106] S6: Obtain the first voltage value of the first voltage signal;

[0107] S7: Obtain the phase difference based on the first voltage value.

[0108] A multi-channel signal source phase calibration method provided by the present disclosure divides the multiple original signals output by the multi-channel signal source into a reference group and a control group, and performs detailed signal processing, including signal extraction, mixing processing, and voltage extraction. This method can accurately obtain the phase difference between the original signals. This accurate phase difference measurement provides high-precision data for phase calibration, thereby significantly improving the calibration accuracy. By selecting the original signals and performing specific signal processing steps, it simplifies the complex multiple manual operation processes in traditional calibration methods, reduces the possibility of human errors, and makes the calibration process more efficient and reliable. Traditional phase calibration methods usually require manually replacing RF cables and multiple measurements, which are time-consuming and costly. However, this method reduces the need for manual operation and repeated measurements through automated signal processing and phase difference calculation, thereby shortening the calibration time and reducing the overall cost. Ensuring the relative phase stability between the multiple phase-different RF signals output by the multi-channel signal source is crucial for the performance evaluation of the interferometer direction-finding system. This method reduces the influence of phase drift and instability through accurate phase calibration, thereby improving the stability and reliability of the entire system. Moreover, this method is not only applicable to the interferometer direction-finding system, but can also be widely applied to other fields that require multi-channel signal source phase calibration, such as radar systems, wireless communication systems, etc. Its flexibility and adaptability enable this method to play a role in different application scenarios. Through standardized signal processing steps and data processing procedures, this method is easy to integrate into existing measurement and calibration systems. At the same time, its modular design also facilitates function expansion and upgrade to meet future higher-precision and more complex calibration requirements.

[0109] In summary, this multi-channel signal source phase calibration method significantly improves the calibration accuracy, simplifies the calibration process, reduces time and cost, enhances the system stability, and improves the system's adaptability and ease of integration through accurate signal processing and phase difference calculation, and has broad application prospects in many fields such as electronic reconnaissance, radar systems, and wireless communication.

[0110] In S1, set the first couplers equal in number to the number of signal source channels. Each first coupler is responsible for receiving one original signal (i.e., RF signal) output by the multi-channel signal source. Divide the multiple first couplers into two groups and connect them to the input ends of two different multiplexers respectively. Therefore, through the cooperation of the two multiplexers and the multiple first couplers, the multiple original signals can be divided into a reference group and a control group.

[0111] In S2, the first coupler performs signal extraction (i.e., coupling) on the received original signal to generate a main path signal and a split path signal (i.e., a coupled signal), and transmits the main path signal to the device under test for the device under test to use. The controller controls the connection between the multiplexer and the first coupler, that is, uses the selection line of the multiplexer to select and connect the first coupler, and selects the required original signal from the reference group and the control group. During this process, the split path signal selected and separated from the reference group is defined as the reference signal, and the split path signal selected and separated from the control group is defined as the control signal.

[0112] Refer to Figure 3 Referring to the schematic diagram of the 8-channel signal source phase calibration circuit shown, RF1_IN, RF2_IN, …, RF8_IN are 8 original signals output by the 8-channel signal source, and C1, C2, …, C8 are 8 first couplers. The 8 first couplers are respectively responsible for receiving one original signal and extracting part of the signal from the original signal, so as to couple the original signal into a main path signal and a split path signal. The 8 main path signals are respectively RF1_OUT, RF2_OUT, …, RF8_OUT. S1 and S2 are multiplexers with 4 input terminals. The 4 input terminals of S1 are respectively connected to C1, C2, C3, and C4, and the 4 input terminals of S2 are respectively connected to C5, C6, C7, and C8. Through this connection method, RF1_IN, RF2_IN, RF3_IN, RF4_IN are divided into the reference group, and RF5_IN, RF6_IN, RF7_IN, RF8_IN are divided into the control group. The MCU is the controller. The MCU controls S1 to select the first coupler that needs to be connected from C1, C2, C3, and C4, so as to obtain the split path signal of the channel where the first coupler is located, and defines it as the reference signal. The MCU controls S2 to select the first coupler that needs to be connected from C5, C6, C7, and C8, so as to obtain the split path signal of the channel where the first coupler is located, and defines it as the control signal.

[0113] By respectively selecting the original signals from the reference group and the control group and performing signal processing, the phase difference between the two required original signals can be obtained, and the multi-channel signal source can be phase-calibrated through the phase difference.

[0114] Refer to Figure 4 Referring to the schematic flow diagram of the method for selecting the original signal and performing phase calibration shown, in the first specific implementation, the method for completing the phase calibration of the multi-channel signal source by selecting the original signal includes the following steps:

[0115] S201: Select one original signal from the reference group as the standard signal;

[0116] S202: Select one original signal from the control group as the signal to be adjusted in sequence;

[0117] S203: Process the standard signal and the signal to be adjusted to obtain the phase difference between the standard signal and the signal to be adjusted;

[0118] S204: Perform phase calibration on the signal source of the signal to be adjusted based on the phase difference;

[0119] S205: After the phase calibration of the signal source of each original signal in the control group is completed, select any one of the original signals in the control group as the new standard signal;

[0120] S206: Select the remaining original signals from the reference group in sequence as the new signals to be adjusted;

[0121] S207: Process the new standard signal and the new signal to be adjusted to obtain the phase difference between the new standard signal and the new signal to be adjusted;

[0122] S208: Perform phase calibration on the signal source of the new signal to be adjusted based on the new phase difference until the phase calibration of the signal sources of all the remaining original signals in the reference group is completed.

[0123] In S201 - S204, the control system of the multi-channel signal source controls the multi-channel signal source to output the original signals, and the control system sends the first channel switching instruction to the controller through the serial communication interface. According to the first channel switching instruction, the controller selects any one of the original signals from the reference group as the standard signal, or selects the one with the best performance (such as signal strength, noise level, frequency stability, specific frequency band and other indicators) as the standard signal. Based on this standard signal, the phase difference between each original signal in the control group and this standard signal is obtained in sequence, and the phase difference is transmitted to the serial communication interface. The serial communication interface reports the phase difference to the control system, and this control system performs phase calibration on the signal source that emits the signal to be adjusted according to the phase difference.

[0124] In S205 - S208, after the phase calibration of the signal source of each original signal in the control group is completed, it indicates that the phases of each original signal in the control group and the standard signal have been unified. At this time, any one of the original signals in the control group is selected as the new standard signal. Based on the new standard signal, the phase difference between the remaining original signals in the reference group (that is, the original signals remaining in the reference group after excluding the initial standard signal) and the new standard signal is obtained in sequence, and the phase difference is transmitted to the serial communication interface, and the control system reports it to perform phase calibration on the signal sources of the remaining original signals in the reference group.

[0125] Refer to Figure 3, taking an 8-channel signal source as an example: The control system controls the multi-channel signal source to output 8 original signals, and sends a first channel switching instruction to the controller through the serial communication interface. The controller determines the first couplers that S1 and S2 need to connect according to the first channel switching instruction. The controller sends a second channel switching instruction Ctrl3 to S1 to connect S1 and C1, and takes the original signal of the channel where C1 is located as the standard signal. The controller sends a third channel switching instruction Ctrl4 to S2 to connect S2 and C5, and takes the original signal of the channel where C5 is located as the signal to be adjusted. Signal processing is performed on the standard signal and the signal to be adjusted to calibrate the phase of the signal source of the signal to be adjusted, so that the phase of channel 1 is aligned with the phase of channel 5. Repeat the above steps. S1 is always connected to C1, and S2 is sequentially connected to C6, C7, and C8, so as to complete the phase alignment of channels 6, 7, and 8 with channel 1 in sequence. Select the calibrated original signal of channel 8 as the new standard signal. S2 is always connected to C8, and S1 is sequentially connected to C2, C3, and C4, so as to complete the phase alignment of channels 2, 3, and 4 with channel 8 in sequence, and the entire phase detection self-calibration process ends. Among them, the channels where C1, C2,..., C8 are located are channel 1, channel 2,..., channel 8 respectively.

[0126] The above solution can complete phase calibration in groups, that is, first calibrate the signal sources of all original signals in the control group, and then calibrate the signal sources of the remaining original signals in the reference group. And during the entire calibration process, the number of times of controlling S1 and S2 is very small, and the number of times of calculating the phase difference is also very small. Therefore, the overall calibration time will be very short, which can effectively improve the calibration speed and efficiency.

[0127] Refer to Figure 5 Another flow schematic diagram of the method for selecting an original signal and performing phase calibration shown, in the second specific implementation, the method for completing the phase calibration of the multi-channel signal source by selecting the original signal includes the following steps:

[0128] S211: Taking one of the original signals in the reference group as the head, set the calibration order;

[0129] S212: In the calibration order, the original signals included in the reference group and the original signals included in the control group are alternately set;

[0130] S213: Taking the i-th original signal in the calibration order as the standard signal, i is initially 1, and 1 ≤ i ≤ I;

[0131] S214: Taking the (i + 1)-th original signal in the calibration order as the signal to be adjusted;

[0132] S215: Perform signal processing on the standard signal and the signal to be adjusted to obtain the phase difference between the standard signal and the signal to be adjusted;

[0133] S216: Phase-calibrate the signal source of the signal to be adjusted based on the phase difference;

[0134] S217: After the phase calibration is completed, increment i by 1, and select a new standard signal and a new signal to be adjusted according to the calibration sequence until i is equal to I.

[0135] In S211 - S217, first, based on one of the original signals in the reference group, phase-calibrate the signal source of one of the original signals in the control group. Then, based on the original signal emitted by the calibrated signal source, phase-calibrate the signal source of one of the original signals in the reference group. Then, based on the original signal emitted by the newly calibrated signal source, phase-calibrate the signal source of another original signal in the control group, and so on, to perform cross-phase calibration on the signal sources of the original signals in the reference group and the control group, thereby completing the calibration of the entire multi-channel signal source.

[0136] Refer to Figure 3 , taking an 8-channel signal source as an example: The preset calibration sequence is Channel 1 - Channel 8 - Channel 2 - Channel 7 - Channel 3 - Channel 6 - Channel 4 - Channel 5. The control system controls the multi-channel signal source to output 8 original signals, and sends a first channel switching instruction to the controller through the serial communication interface. The controller determines the first coupler that S1 and S2 need to connect according to the first channel switching instruction. The controller sends a second channel switching instruction Ctrl3 to S1 to connect S1 and C1, and uses the original signal in the channel where C1 is located as the standard signal. The controller sends a third channel switching instruction Ctrl4 to S2 to connect S2 and C8, and uses the original signal in the channel where C8 is located as the signal to be adjusted. Perform signal processing on the standard signal and the signal to be adjusted to phase-calibrate the signal source of the signal to be adjusted, so that the phase of Channel 1 is aligned with the phase of Channel 8. According to the preset calibration sequence, then connect S2 and C8, and change S1 to connect with C2, so that the phase of Channel 2 is aligned with the phase of Channel 8, and so on, gradually complete the phase calibration of all signal sources according to the calibration sequence.

[0137] The above solution can achieve cross-phase calibration between multi-channel signal sources. During this process, the number of changes to the selection lines of S1 and S2 is very small, and the phase difference calculation is also very small. Therefore, the overall calibration time will be very short, achieving efficient calibration.

[0138] Refer to Figure 6 Another flow diagram showing the method of selecting the original signal and performing phase calibration. In the third specific implementation, the method for completing the phase calibration of the multi-channel signal source by selecting the original signal includes the following steps:

[0139] S221: Arbitrarily select one of the original signals in the control group as the reference signal;

[0140] S222: According to the signal processing method, obtain the phase difference between each original signal and the reference signal in the reference group, denoted as the first phase difference;

[0141] S223: Select one original signal from the reference group as the standard signal, and the remaining original signals in the reference group as the signals to be adjusted;

[0142] S224: Based on the first phase difference, obtain the phase difference between the standard signal and the signal to be adjusted, denoted as the second phase difference;

[0143] S225: Based on the second phase difference, perform phase calibration on the signal source of the signal to be adjusted;

[0144] S226: Sequentially select one original signal from the control group as the new signal to be adjusted;

[0145] S227: According to the signal processing method, obtain the phase difference between the standard signal and the new signal to be adjusted, denoted as the third phase difference;

[0146] S228: Based on the third phase difference, perform phase calibration on the signal source of the new signal to be adjusted.

[0147] In S221 - S228, the second phase difference between the standard signal and the signal to be adjusted is equal to the difference obtained by subtracting the first phase difference between the signal to be adjusted and the reference signal from the first phase difference between the standard signal and the reference signal. Based on the second phase difference, perform phase calibration on the signal source of the signal to be adjusted. In this way, based on one original signal (i.e., the standard signal) in the reference group, perform phase calibration on the signal sources of the remaining original signals in the reference group. After calibration, continue to use the standard signal as the basis and sequentially perform phase calibration on the signal sources of the original signals in the control group.

[0148] Refer to Figure 3, taking an 8-channel signal source as an example: respectively obtain the first phase differences between RF1_IN, RF2_IN, RF3_IN, RF4_IN and RF8_IN; the second phase difference between RF1_IN and RF2_IN is equal to the difference between the first phase difference between RF1_IN and RF8_IN and the first phase difference between RF2_IN and RF8_IN. Based on the second phase difference between RF1_IN and RF2_IN, phase calibration is performed on the signal source of RF2_IN; the second phase difference between RF1_IN and RF3_IN is equal to the difference between the first phase difference between RF1_IN and RF8_IN and the first phase difference between RF3_IN and RF8_IN. Based on the second phase difference between RF1_IN and RF3_IN, phase calibration is performed on the signal source of RF3_IN; the second phase difference between RF1_IN and RF4_IN is equal to the difference between the first phase difference between RF1_IN and RF8_IN and the first phase difference between RF4_IN and RF8_IN. Based on the second phase difference between RF1_IN and RF4_IN, phase calibration is performed on the signal source of RF4_IN. Sequentially obtain the third phase differences between RF1_IN and RF5_IN, RF6_IN, RF7_I, RF8_IN. Among them, the third phase difference between RF1_IN and RF8_IN is the first phase difference between RF1_IN and RF8_IN obtained previously. Based on these third phase differences, phase calibration is sequentially performed on the signal sources of RF5_IN, RF6_IN, RF7_I, RF8_IN.

[0149] The above solution can achieve phase calibration in the order of the multi-channel signal source itself, meeting the special needs of users.

[0150] Based on the actual needs of users, the above three specific implementation schemes can be deformed or combined to meet the needs of users in terms of overall calibration speed, efficiency, order, etc. It can be seen that the multi-channel signal source phase calibration method of the present disclosure has great flexibility and expandability and is applicable to a variety of demand scenarios.

[0151] Next, a detailed description of the signal processing method will be given:

[0152] In S3, signal extraction is performed on the original signals selected from the reference group to obtain reference signals, and signal extraction is performed on the original signals selected from the control group to obtain control signals.

[0153] In S4, referring to Figure 7 the flow chart of the mixing processing method shown, "performing mixing processing on the reference signal and the control signal to obtain an intermediate frequency signal" includes the following steps:

[0154] S41: Adjust the powers of the reference signal and the control signal respectively to obtain a first detection signal and a second detection signal;

[0155] S42: Couple the first detection signal and the second detection signal respectively to obtain a first direct signal and a second direct signal;

[0156] S43: Mix the first direct signal and the second direct signal to obtain an intermediate frequency signal.

[0157] In S41 - S43, refer to Figure 3 , two attenuators, two amplifiers, two second couplers and a mixer are set. Among them, Ta and Tb are attenuators, Pa and Pb are amplifiers, Ca and Cb are second couplers, and X1 is a mixer. The first coupler and the second coupler in this disclosure are essentially directional couplers. However, for the convenience of distinction, "first" and "second" are used for identification.

[0158] Ta and Pa are used in combination to adjust the power of the reference signal to obtain a first detection signal. Tb and Pb are used in combination to adjust the power of the control signal to obtain a second detection signal. Among them, Ta and Tb are used to attenuate the powers of the reference signal and the control signal, and Pa and Pb are used to increase the powers of the reference signal and the control signal. By attenuating and increasing the power, the powers of the reference signal and the control signal can be adjusted to a range suitable for subsequent detection.

[0159] Ca couples the first detection signal to obtain a first direct signal RF, Cb couples the second detection signal to obtain a second direct signal LO, and X1 mixes RF and LO to obtain an intermediate frequency signal IF.

[0160] Since the first direct signal, the second direct signal, and the intermediate frequency signal are signals that change with time, therefore, the first direct signal can also be defined as RF(t), the second direct signal can also be defined as LO(t), and the intermediate frequency signal can also be defined as IF(t).

[0161] Among them, the expression of the first direct signal is:

[0162] RF(t) = cos(2 *π* f * t +φ1); (Formula 1)

[0163] In Formula 1, t represents the signal duration; π represents the pi; φ1 represents the initial phase of the first direct signal.

[0164] The expression of the second direct signal is:

[0165] LO(t) = cos(2 *π* f * t +φ2); (Formula 2)

[0166] In Formula 2, φ2 represents the initial phase of the second direct signal.

[0167] The expression of the intermediate frequency signal is:

[0168] IF(t) = RF(t)*LO(t) = (1 / 2)*[cos(4*π* f * t +φ1+φ2)+cos(φ1-φ2)]. (Formula 3)

[0169] In S5, referring to Figure 3 , a low-pass filter F1 is set. F1 can filter out high-frequency components and retain the DC voltage information. Therefore, by extracting the voltage of the intermediate frequency signal through F1, a voltage signal can be obtained, and this voltage signal is denoted as the first voltage signal V1, and its expression is:

[0170] V1 = (1 / 2)*cos(φ1 - φ2). (Formula 4)

[0171] In S6, referring to Figure 3 , a first analog-to-digital converter ADC1 is set. ADC1 can convert an analog voltage signal into a digital signal. Therefore, the voltage value of the first voltage signal can be obtained through ADC1, and this voltage value is denoted as the first voltage value v1, and its expression is:

[0172] v1 = V ref1 *Value1 / 2^ N1 ; (Formula 5)

[0173] In Formula 5, V ref1 represents the reference voltage, specifically the reference voltage of ADC1; Value1 represents the voltage quantization value of the first voltage signal, specifically the voltage quantization value collected by ADC1 read by the MCU; N1 represents the quantization bit number, specifically the quantization bit number of ADC1.

[0174] In S7, after the MCU obtains v1, it can calculate the phase difference △φ' between the first direct signal and the second direct signal through Formulas 1-6, and the phase difference △φ between the original signals selected from the reference group and the control group is equal to the phase difference △φ' between the first direct signal and the second direct signal. The expression of the phase difference is:

[0175] △φ = △φ' = φ1 - φ2 = arccos(2* v1). (Formula 6)

[0176] Referring to Figure 8 the waveform simulation diagram showing that the phase difference between RF and LO is 30 degrees, Figure 9 the waveform simulation diagram of the mixed frequency of RF and LO with a phase difference of 30 degrees, that is, the waveform simulation diagram of the intermediate frequency signalFigure 10 The waveform simulation diagram of the intermediate frequency signal after low-pass filtering shown is the waveform simulation diagram of the first voltage signal. When the phase difference between the first direct signal and the second direct signal is 30 degrees, V1 = (1 / 2) * cos(30°) ≈ 0.433.

[0177] Referring to Figure 11 The waveform simulation diagram showing the 60-degree phase difference between RF and LO, Figure 12 The waveform simulation diagram of the RF and LO after mixing with a 60-degree phase difference shown is another waveform simulation diagram of the intermediate frequency signal, Figure 13 The waveform simulation diagram of the intermediate frequency signal after low-pass filtering shown is another waveform simulation diagram of the first voltage signal. When the phase difference between the first direct signal and the second direct signal is 60 degrees, V1 = (1 / 2) * cos(60°) ≈ 0.25.

[0178] Through the above method, by coupling two selected original signals, only processing the separated branch signals, supplying the main path signal to the device under test for use to avoid affecting the operation of the device under test, adjusting the power of the two separated branch signals so that the subsequent mixer can perform the mixing process between the first direct signal and the second direct signal to obtain an intermediate frequency signal, and by extracting the voltage and performing numerical conversion on the intermediate frequency signal, the first voltage value used to calculate the phase difference can be obtained, thereby accurately calibrating the phase of the multi-channel signal source.

[0179] Calibrating the inter-channel phase error of a multi-channel signal source by a vector network analyzer (VNA) in the traditional technology is a complex and cumbersome task. As a high-precision measuring instrument, although the vector network analyzer can provide accurate phase error calibration, its price is expensive. Taking an 8-channel signal source as an example, usually taking channel 1 as a reference, channels 2 to 8 need to be calibrated in sequence. After each calibration, the RF cable needs to be manually replaced, which makes the whole calibration process very cumbersome and time-consuming. Since a complete calibration process is very complex, usually all the frequency points to be used are calibrated at one time. However, the more frequency points are calibrated, the longer the time consumed. Although this method can ensure that the phase errors of all frequency points are corrected, its time and operation costs are high.

[0180] The multi-channel signal source phase calibration method of the present disclosure not only uses components with low price costs, but also does not require manual replacement of the RF cable. The multi-channel signal source can automatically complete the real-time calibration of the phase on the premise of not affecting the normal use of the device under test. The calibration process is automatically completed before the signal output, so only the frequency point to be used currently needs to be calibrated each time, and the speed is very fast.

[0181] Furthermore, referring to Figure 3, Ca couples the first detection signal, and can not only obtain the first direct signal RF, but also obtain the first coupled signal. Cb couples the second detection signal, and can not only obtain the second direct signal LO, but also obtain the second coupled signal. Two detectors, a second analog-to-digital converter, and a third analog-to-digital converter are set. The two detectors are La and Lb respectively, which can convert the power of the signal into voltage. The second analog-to-digital converter is ADC2, and the third analog-to-digital converter is ADC3. La converts the power of the first coupled signal to obtain the second voltage signal V2, and Lb converts the power of the second coupled signal to obtain the third voltage signal V3. ADC2 obtains the second voltage value v2 of V2, and ADC3 obtains the second voltage value v3 of V3.

[0182] The MCU obtains the power P1 of the second voltage signal based on v2 acq , according to P1 acq Obtain the power attenuation amount required for the reference signal, that is, the power attenuation amount △P1 of Ta. The MCU obtains the power P2 of the third voltage signal based on v3 acq , according to P2 acq Obtain the power attenuation amount required for the comparison signal, that is, the power attenuation amount △P2 of Tb.

[0183] Among them, the output voltage VLa of La and P1 acq The relational expression is:

[0184] VLa = K1 * P1 acq ; (Formula 7)

[0185] In Formula 7, K1 is the constant coefficient of La, which can be obtained through the chip manual of La or measurement.

[0186] The expression of v2 is:

[0187] v2 = V ref2 *Value2 / 2^ N2 ; (Formula 8)

[0188] In Formula 8, V ref2 represents the reference voltage of ADC2; Value2 represents the voltage quantization value of the second voltage signal, specifically the voltage quantization value collected by ADC2 read by the MCU; N2 represents the quantization bit number of ADC2.

[0189] By solving Formula 7 and Formula 8, the value of P1 acq can be obtained, and the calculation formula is:

[0190] P1 acq = (V ref2 *Value2 / 2^ N2 ) / K1; (Formula 9)

[0191] The calculation formula for △P1 is:

[0192] △P1 = P1 acq - P1 set ; (Formula 10)

[0193] In Formula 10, P1 set is the first preset value.

[0194] The MCU generates the first control signal Ctrl1 through △P1. The correspondence between Ctrl1 and △P1 can be obtained from the chip manual of Ta. Send Ctrl1 to Ta, and Ta adjusts the power attenuation amount required for the reference signal according to Ctrl1.

[0195] Among them, the relationship between the output voltage VLb of Lb and P2 acq is:

[0196] VLb = K2 * P2 acq ; (Formula 11)

[0197] In Formula 7, K2 is the constant coefficient of Lb and can be obtained through the chip manual of Lb or measurement.

[0198] The expression of v3 is:

[0199] v3 = V ref3 * Value3 / 2^ N3 ; (Formula 12)

[0200] In Formula 8, V ref3 represents the reference voltage of ADC3; Value3 represents the voltage quantization value of the second voltage signal, specifically the voltage quantization value collected by ADC3 read by the MCU; N3 represents the quantization bit number of ADC3.

[0201] By solving Formula 11 and Formula 12, the value of P2 acq can be obtained, and the calculation formula is:

[0202] P2 acq = (V ref3 * Value3 / 2^ N3 ) / K2; (Formula 9)

[0203] The calculation formula for △P2 is:

[0204] △P2 = P2 acq - P2 set ; (Formula 10)

[0205] In Formula 10, P2 set is the second preset value.

[0206] The MCU generates a second control signal Ctrl2 through △P2. The correspondence between Ctrl2 and △P2 can be obtained from the chip manual of Tb. Send Ctrl2 to Tb, and Tb adjusts the power attenuation amount required for the reference signal according to Ctrl2.

[0207] Refer to Figure 3 The present disclosure provides a multi-channel signal source phase calibration system, including a plurality of first couplers, two multiplexers, a controller, a mixing module, a low-pass filter, a first analog-to-digital converter, and a serial communication interface;

[0208] The input end of each first coupler is connected to the output end of a signal source of a different channel. The plurality of first couplers respectively receive a path of original signal output by the multi-channel signal source;

[0209] The plurality of first couplers are divided into two groups. The output end of one group of first couplers is connected to the input end of one multiplexer, and the output end of the other group of first couplers is connected to the input end of the other multiplexer. The two multiplexers and the plurality of first couplers divide the multi-path original signals into a reference group and a control group;

[0210] The output ends of the two multiplexers are both connected to the input end of the mixing module, and the two multiplexers are both wirelessly connected to the controller. The controller controls the connection between the two multiplexers and the first couplers, selects the original signals from the reference group and the control group, and performs signal processing to obtain the phase difference between the original signals;

[0211] The mixing module, the low-pass filter, the first analog-to-digital converter, and the serial communication interface are connected in sequence, and the serial communication interface is also connected to the control system of the multi-channel signal source;

[0212] The serial communication interface performs phase calibration on the multi-channel signal source based on the phase difference;

[0213] Among them, the signal processing includes:

[0214] Two first couplers respectively connected to the two multiplexers perform signal extraction on the received original signals to obtain a reference signal and a control signal;

[0215] The mixing module performs mixing processing on the reference signal and the control signal respectively to obtain intermediate frequency signals;

[0216] The low-pass filter extracts the voltage of the intermediate frequency signal to obtain a first voltage signal;

[0217] The first analog-to-digital converter obtains the first voltage value of the first voltage signal;

[0218] The controller obtains the phase difference based on the first voltage value and transmits the phase difference to the serial communication interface.

[0219] Among them, the mixing module includes two attenuators, two amplifiers, two second couplers and a mixer;

[0220] The input ends of the two attenuators are respectively connected to the output ends of the two multiplexers, the input ends of the two amplifiers are respectively connected to the output ends of the two attenuators, the output ends of the two second couplers are respectively connected to the output ends of the two amplifiers, the input end of the mixer is connected to the main output ends of the two second couplers, and the input end of the low-pass filter is connected to the output end of the mixer;

[0221] The two attenuators and the two amplifiers respectively adjust the power of the reference signal and the reference signal to obtain a first detection signal and a second detection signal;

[0222] The two second couplers respectively couple the first detection signal and the second detection signal to obtain a first direct signal and a second direct signal;

[0223] The mixer mixes the first direct signal and the second direct signal to obtain an intermediate frequency signal.

[0224] The multi-channel signal source phase calibration system further includes two detectors, a second analog-to-digital converter and a third analog-to-digital converter;

[0225] The input ends of the two detectors are respectively connected to the coupled output ends of the two second couplers, and the output ends of the two detectors are respectively connected to the input end of the second analog-to-digital converter and the input end of the third analog-to-digital converter;

[0226] The controller is connected to the output end of the second analog-to-digital converter and the output end of the third analog-to-digital converter;

[0227] The second coupler respectively couples the first detection signal and the second detection signal to obtain a first coupled signal and a second coupled signal;

[0228] The two detectors respectively perform power conversion on the first coupled signal and the second coupled signal to obtain a second voltage signal and a third voltage signal;

[0229] The second analog-to-digital converter and the third analog-to-digital converter respectively obtain the second voltage value of the second voltage signal and the third voltage value of the third voltage signal;

[0230] The controller obtains the power of the second voltage signal and the third voltage signal based on the second voltage value and the third voltage value, and adjusts the required power attenuation amount of the reference signal and the reference signal based on the power of the second voltage signal and the third voltage signal.

[0231] The various variations and specific examples in the multi-channel signal source phase calibration method provided above are equally applicable to the multi-channel signal source phase calibration system provided in the present disclosure. Through the detailed description of the multi-channel signal source phase calibration method above, those skilled in the art can clearly know the implementation method of the multi-channel signal source phase calibration system. For the sake of brevity of the specification, it will not be elaborated here.

[0232] The basic principles of the present disclosure have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, benefits, effects, etc. mentioned in the present disclosure are only examples and not limitations, and it cannot be considered that these advantages, benefits, effects, etc. are essential for each embodiment of the present disclosure. In addition, the specific details disclosed above are only for the purpose of illustration and facilitating understanding, rather than limitations, and the above details do not limit the present disclosure to necessarily adopt the above specific details to implement.

[0233] In the present disclosure, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. The block diagrams of devices, apparatuses, equipment, and systems involved in the present disclosure are only illustrative examples and do not intend to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open-ended words, meaning "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the word "and / or" and can be used interchangeably with it, unless the context clearly indicates otherwise. The word "such as" used here refers to the phrase "such as but not limited to" and can be used interchangeably with it.

[0234] In addition, as used herein, the "or" in the listing of items starting with "at least one" indicates a separate listing, so that for example, the listing of "at least one of A, B, or C" means A or B or C, or AB or AC or BC, or ABC (i.e., A and B and C). In addition, the term "exemplary" does not mean that the described examples are preferred or better than other examples.

[0235] It should also be noted that in the systems and methods of the present disclosure, each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be regarded as equivalent solutions of the present disclosure.

[0236] Various changes, substitutions, and alterations to the technology described herein can be made without departing from the teachings defined by the appended claims. In addition, the scope of the claims of this disclosure is not limited to the specific aspects of the processes, machines, manufactures, compositions of events, means, methods, and acts described above. Processes, machines, manufactures, compositions of events, means, methods, or acts that are currently existing or later to be developed that perform substantially the same function or achieve substantially the same result as the corresponding aspects described herein can be utilized. Accordingly, the appended claims include such processes, machines, manufactures, compositions of events, means, methods, or acts within their scope.

[0237] The foregoing description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the present disclosure. Thus, the present disclosure is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0238] The foregoing description has been presented for purposes of illustration and description. In addition, this description is not intended to limit the embodiments of the present disclosure to the forms disclosed herein. Although numerous example aspects and embodiments have been discussed above, those skilled in the art will recognize some of their variations, modifications, alterations, additions, and subcombinations.

Claims

1. A multi-channel signal source phase calibration method, characterized in that, Including: Receiving multiple original signals output by a multi-channel signal source and dividing them into a reference group and a control group; By selecting original signals from the reference group and the control group and performing signal processing, obtaining the phase difference between the original signals, and performing phase calibration on the multi-channel signal source based on the phase difference; Among them, the signal processing includes: Performing signal extraction on the original signals selected from the reference group and the control group to obtain a reference signal and a control signal; Performing mixing processing on the reference signal and the control signal to obtain an intermediate-frequency signal; Among them, performing mixing processing on the reference signal and the control signal to obtain an intermediate-frequency signal includes: Respectively performing power adjustment on the reference signal and the control signal to obtain a first detection signal and a second detection signal; Respectively coupling the first detection signal and the second detection signal to obtain a first direct-through signal and a second direct-through signal; Mixing the first direct-through signal and the second direct-through signal to obtain the intermediate-frequency signal; Performing voltage extraction on the intermediate-frequency signal to obtain a first voltage signal; Obtaining a first voltage value of the first voltage signal; Obtaining the phase difference based on the first voltage value.

2. The multi-channel signal source phase calibration method according to claim 1, characterized in that By selecting original signals from the reference group and the control group, including: Selecting one original signal from the reference group as a standard signal; Sequentially selecting one original signal from the control group as a signal to be adjusted; Performing signal processing on the standard signal and the signal to be adjusted to obtain the phase difference between the standard signal and the signal to be adjusted; Performing phase calibration on the signal source of the signal to be adjusted based on the phase difference; After the phase calibration of the signal source of each original signal in the control group is completed, selecting one original signal from the control group as a new standard signal; Sequentially selecting the remaining original signals from the reference group as new signals to be adjusted; Performing signal processing on the new standard signal and the new signal to be adjusted to obtain the phase difference between the new standard signal and the new signal to be adjusted; Performing phase calibration on the signal source of the new signal to be adjusted based on the new phase difference until the phase calibration of all the signal sources of the remaining original signals in the reference group is completed.

3. The multi-channel signal source phase calibration method according to claim 1, characterized in that By selecting original signals from the reference group and the control group, including: Taking one original signal in the reference group as the head and setting a calibration sequence; In the calibration sequence, the original signals included in the reference group and the original signals included in the control group are alternately set; Taking the i-th original signal in the calibration sequence as the standard signal, where i is initially 1 and 1 ≤ i ≤ I; Taking the (i + 1)-th original signal in the calibration sequence as the signal to be adjusted; Performing signal processing on the standard signal and the signal to be adjusted to obtain the phase difference between the standard signal and the signal to be adjusted; Performing phase calibration on the signal source of the signal to be adjusted based on the phase difference; After the phase calibration is completed, increment i by 1, and select a new standard signal and a new signal to be adjusted according to the calibration sequence until i is equal to I.

4. The multi-channel signal source phase calibration method according to claim 1, characterized in that By selecting original signals from the reference group and the control group, including: Optionally selecting one original signal from the control group as a reference signal; According to the signal processing method, obtain the phase difference between each original signal in the reference group and the reference signal, denoted as the first phase difference; Select one original signal from the reference group as the standard signal, and the remaining original signals in the reference group as the signals to be adjusted; Based on the first phase difference, obtain the phase difference between the standard signal and the signal to be adjusted, denoted as the second phase difference; Based on the second phase difference, perform phase calibration on the signal source of the signal to be adjusted; Sequentially select one original signal from the control group as the new signal to be adjusted; According to the signal processing method, obtain the phase difference between the standard signal and the new signal to be adjusted, denoted as the third phase difference; Based on the third phase difference, perform phase calibration on the signal source of the new signal to be adjusted.

5. The multi-channel signal source phase calibration method according to claim 1, wherein The expression of the first direct signal is: RF(t) = cos(2 *π* f * t +φ1); Wherein, RF(t) represents the first direct signal; t represents the signal duration; π represents the pi; φ1 represents the initial phase of the first direct signal; The expression of the second direct signal is: LO(t) = cos(2 *π* f * t +φ2); Wherein, LO(t) represents the second direct signal; φ2 represents the initial phase of the second direct signal; The expression of the intermediate frequency signal is: IF(t) = RF(t)*LO(t) = (1 / 2)*[cos(4*π* f * t +φ1+φ2)+cos(φ1 -φ2)]; Wherein, IF(t) represents the intermediate frequency signal.

6. The multi-channel signal source phase calibration method according to claim 5, wherein The expression of the first voltage signal is: V1 = (1 / 2)*cos(φ1 - φ2); Wherein, V1 represents the first voltage signal; The expression of the first voltage value is: v1 = V ref1 *Value1 / 2^ N1 ; Among them, v1 represents the first voltage value; V ref1 represents the reference voltage; Value1 represents the voltage quantization value of the first voltage signal; N1 represents the quantization bit number; The expression of the phase difference is: △φ = △φ' = φ1 - φ2= arccos(2* v1); Wherein, △φ represents the phase difference between the original signals selected from the reference group and the control group; △φ' represents the phase difference between the first direct signal and the second direct signal.

7. The multi-channel signal source phase calibration method according to claim 1, characterized in that Further includes: By coupling the first detection signal and the second detection signal, obtain the first coupling signal and the second coupling signal; Perform power conversion on the first coupling signal and the second coupling signal respectively to obtain the second voltage signal and the third voltage signal; Obtain the second voltage value of the second voltage signal and the third voltage value of the third voltage signal; Based on the second voltage value and the third voltage value, obtain the power of the second voltage signal and the third voltage signal; Based on the power of the second voltage signal and the third voltage signal, adjust the required power attenuation amount of the reference signal and the control signal.

8. A multi-channel signal source phase calibration system applied to the multi-channel signal source phase calibration method according to any one of claims 1-7, characterized in that, Includes a plurality of first couplers, two multiplexers, a controller, a mixing module, a low-pass filter, a first analog-to-digital converter, and a serial communication interface; The input end of each first coupler is connected to the output end of a signal source of a different channel. The multiple first couplers are divided into two groups. The output ends of one group of first couplers are connected to the input end of one multiplexer, and the output ends of the other group of first couplers are connected to the input end of another multiplexer; The output ends of the two multiplexers are both connected to the input end of the mixing module, and the two multiplexers are both wirelessly connected to the controller; The mixing module, the low-pass filter, the first analog-to-digital converter, and the serial communication interface are connected in sequence, and the serial communication interface is also connected to the control system of the multi-channel signal source.

9. The multi-channel signal source phase calibration system according to claim 8, wherein The mixing module includes two attenuators, two amplifiers, two second couplers, and a mixer; The input ends of the two attenuators are respectively connected to the output ends of the two multiplexers. The input ends of the two amplifiers are respectively connected to the output ends of the two attenuators. The output ends of the two second couplers are respectively connected to the output ends of the two amplifiers. The input end of the mixer is connected to the main output ends of the two second couplers. The input end of the low-pass filter is connected to the output end of the mixer.

10. The multi-channel signal source phase calibration system according to claim 9, characterized in that, The multi-channel signal source phase calibration system further includes two detectors, a second analog-to-digital converter, and a third analog-to-digital converter; The input ends of the two detectors are respectively connected to the coupled output ends of the two second couplers. The output ends of the two detectors are respectively connected to the input end of the second analog-to-digital converter and the input end of the third analog-to-digital converter; The controller is connected to the output end of the second analog-to-digital converter and the output end of the third analog-to-digital converter.

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