Multi-channel signal source phase calibration method and system

Abstract

The embodiment of the invention discloses a multichannel signal source phase calibration method and system. The method comprises the following steps: receiving multiple paths of original signals output by a multi-channel signal source and dividing the signals into a reference group and a control group; the method comprises the following steps: selecting original signals from a reference group and a control group, carrying out signal processing, obtaining a phase difference between the original signals, and carrying out phase calibration on a multi-channel signal source based on the phase difference; wherein the signal processing comprises the following steps of: performing signal extraction on original signals selected from a reference group and a control group to obtain a reference signal and a control signal; performing frequency mixing processing on the reference signal and the contrast signal to obtain an intermediate frequency signal; performing voltage extraction on the intermediate frequency signal to obtain a first voltage signal; acquiring a first voltage value of the first voltage signal; a phase difference is obtained based on the first voltage value. According to the method, efficient and accurate phase calibration can be carried out on the multi-channel signal source through signal processing and phase difference calculation, and the system stability is improved.

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 equipment in electronic reconnaissance. During its development, it is necessary to generate multi-path phase-difference radio frequency signals for excitation and testing. The interferometer direction finding system belongs to the phase method direction finding system. It mainly uses the different spatial positions of different antennas when the radio waves reach the direction finding antenna array, resulting in different signal phases received by each antenna unit. By measuring the phase difference 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 multi-path phase-difference RF signals output by the multi-channel signal source are unstable, it will seriously affect the performance 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, thereby improving system stability.

[0005] In a first aspect, an embodiment of the present disclosure provides a multi-channel signal source phase calibration method, which adopts the following technical solution:

[0006] receiving multiple original signals output by a multi-channel signal source and dividing the signals 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, a phase difference between the original signals is obtained, and phase calibration is performed on the multi-channel signal source based on the phase difference;

[0008] Wherein, the signal processing includes:

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

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

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

[0012] Acquire a first voltage value of the first voltage signal;

[0013] YY+242294P-YX

[0014] The phase difference is acquired based on the first voltage value.

[0015] Optionally, selecting the original signal from the reference group and the control group comprises:

[0016] Selecting an original signal from the reference group as a standard signal;

[0017] Selecting one original signal from the control group in turn as the signal to be adjusted;

[0018] Performing signal processing on the standard signal and the signal to be adjusted to obtain a phase difference between the standard signal and the signal to be adjusted;

[0019] Performing phase calibration on a signal source of the signal to be modulated based on the phase difference;

[0020] After the signal source phase calibration of each original signal in the control group is completed, one original signal is selected from the control group as a new standard signal;

[0021] Selecting the remaining original signals from the reference group in turn as new signals to be adjusted;

[0022] Performing signal processing on the new standard signal and the new signal to be adjusted to obtain a phase difference between the new standard signal and the new signal to be adjusted;

[0023] The signal source of the new signal to be modulated is phase-calibrated 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.

[0024] Optionally, selecting the original signal from the reference group and the control group comprises:

[0025] Setting a calibration order with one original signal in the reference group as the first;

[0026] In the calibration sequence, the original signals included in the reference group and the original signals included in the control group are alternately arranged;

[0027] The i-th original signal in the calibration sequence is used as the standard signal, i is initially 1, and 1≤i≤I;

[0028] Taking the i+1th original signal in the calibration sequence as the signal to be calibrated;

[0029] Performing signal processing on the standard signal and the signal to be adjusted to obtain a phase difference between the standard signal and the signal to be adjusted;

[0030] Performing phase calibration on a signal source of the signal to be modulated based on the phase difference;

[0031] After the phase calibration is completed, i is increased by 1, and a new standard signal and a new signal to be adjusted are selected according to the calibration sequence until i is equal to I.

[0032] Optionally, selecting the original signal from the reference group and the control group comprises:

[0033] Selecting one original signal from the control group as a reference signal;

[0034] According to the signal processing method, a phase difference between each original signal in the reference group and the reference signal is obtained, which is recorded as a first phase difference;

[0035] One original signal is selected from the reference group as the standard signal, and the remaining original signals in the reference group are YY+242294P-YX

[0036] is the signal to be adjusted;

[0037] Based on the first phase difference, a phase difference between the standard signal and the signal to be adjusted is obtained, which is recorded as a second phase difference;

[0038] Performing phase calibration on a signal source of the signal to be modulated based on the second phase difference;

[0039] Selecting one original signal from the control group in turn as a new signal to be adjusted;

[0040] According to the signal processing method, a phase difference between the standard signal and the new signal to be adjusted is obtained, which is recorded as a third phase difference;

[0041] A phase calibration is performed on a signal source of a new signal to be modulated based on the third phase difference.

[0042] Optionally, the mixing the reference signal and the control signal to obtain an intermediate frequency signal includes:

[0043] respectively adjusting the power of the reference signal and the control signal to obtain a first detection signal and a second detection signal;

[0044] Respectively coupling the first detection signal and the second detection signal to obtain a first direct-through signal and a second direct-through signal;

[0045] The first direct-through signal and the second direct-through signal are mixed to obtain the intermediate frequency signal.

[0046] Optionally, the first direct signal is expressed as:

[0047] RF(t)=cos(2*π*f*t+φ1);

[0048] Wherein, RF(t) represents the first direct signal; t represents the signal duration; π represents the circumference of a circle; φ1 represents the initial phase of the first direct signal;

[0049] The expression of the second direct signal is:

[0050] LO(t)=cos(2*π*f*t+φ2);

[0051] Wherein, LO(t) represents the second direct signal; φ2 represents the initial phase of the second direct signal;

[0052] The expression of the intermediate frequency signal is:

[0053] IF(t)=RF(t)*LO(t)=(1 / 2)*[cos(4*π*f*t+φ1+φ2)+cos(φ1-φ2)];

[0054] Wherein, IF(t) represents the intermediate frequency signal.

[0055] Optionally, the first voltage signal is expressed as:

[0056] V1=(1 / 2)*cos(φ1-φ2);

[0057] Wherein, V1 represents a first voltage signal;

[0058] The expression of the first voltage value is:

[0059] v1=V ref1 *Value1 / 2^ N1 ;

[0060] YY+242294P-YX

[0061] 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 number of quantization bits;

[0062] The expression of the phase difference is:

[0063] △φ=△φ'=φ1-φ2=arccos(2*v1);

[0064] Here, Δφ represents the phase difference between the original signals selected from the reference group and the control group; Δφ′ represents the phase difference between the first direct signal and the second direct signal.

[0065] Optionally, the multi-channel signal source phase calibration method further includes:

[0066] By coupling the first detection signal and the second detection signal, a first coupled signal and a second coupled signal are obtained;

[0067] Performing power conversion on the first coupled signal and the second coupled signal respectively to obtain a second voltage signal and a third voltage signal;

[0068] Acquire a second voltage value of the second voltage signal and a third voltage value of the third voltage signal;

[0069] Based on the second voltage value and the third voltage value, acquiring power of the second voltage signal and the third voltage signal;

[0070] The power attenuation amounts required for the reference signal and the control signal are adjusted based on the powers of the second voltage signal and the third voltage signal.

[0071] In a second aspect, the embodiment of the present disclosure further provides a multi-channel signal source phase calibration system, which adopts the following technical solution:

[0072] 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;

[0073] The input end of each first coupler is connected to the output end of a signal source of a different channel, and 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 another multiplexer;

[0074] The output ends of the two multiplexers are both connected to the input end of the frequency mixing module, and the two multiplexers are both wirelessly connected to the controller;

[0075] The frequency 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 a control system of a multi-channel signal source.

[0076] Optionally, the mixing module includes two attenuators, two amplifiers, two second couplers and a mixer;

[0077] The input ends of the two attenuators are connected to the output ends of the two multiplexers respectively, the input ends of the two amplifiers are connected to the output ends of the two attenuators respectively, the output ends of the two second couplers are connected to the output ends of the two amplifiers respectively, 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.

[0078] 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;

[0079] 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;

[0080] The controller is connected to an output end of the second analog-to-digital converter and an output end of the third analog-to-digital converter.

[0081] The multi-channel signal source phase calibration method provided by the embodiment of the present disclosure can accurately obtain the phase difference between the original signals by dividing the multi-channel original signals output by the multi-channel signal source into a reference group and a control group, and performing detailed signal processing, including signal extraction, mixing processing and voltage extraction. This accurate phase difference measurement provides high-precision data for phase calibration, thereby significantly improving the accuracy of calibration. By selecting the original signal and performing specific signal processing steps, the complex multiple manual operation process in the traditional calibration method is simplified, the possibility of human error is reduced, and the calibration process is more efficient and reliable.

[0082] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0083] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0084] Figure 1 A schematic diagram of a flow chart of a multi-channel signal source phase calibration method provided by an embodiment of the present disclosure;

[0085] Figure 2 A flowchart of a signal processing method provided by an embodiment of the present disclosure;

[0086] Figure 3 A schematic diagram of an 8-channel signal source phase calibration circuit provided in an embodiment of the present disclosure;

[0087] Figure 4 A schematic diagram of a flow chart of a method for selecting an original signal and performing phase calibration provided in an embodiment of the present disclosure;

[0088] Figure 5 Another flowchart of the method for selecting an original signal and performing phase calibration provided by the embodiment of the present disclosure; YY+242294P-YX

[0089] Figure 6 Another flowchart of the method for selecting an original signal and performing phase calibration provided by an embodiment of the present disclosure;

[0090] Figure 7 A flow chart of a frequency mixing processing method provided in an embodiment of the present disclosure;

[0091] Figure 8 A waveform simulation diagram showing a 30-degree phase difference between RF and LO provided in an embodiment of the present disclosure;

[0092] Fig. 9 A waveform simulation diagram of an intermediate frequency signal provided in an embodiment of the present disclosure;

[0093] Fig.10 A waveform simulation diagram of a first voltage signal provided in an embodiment of the present disclosure;

[0094] Fig.11 A waveform simulation diagram showing a 60-degree phase difference between RF and LO provided in an embodiment of the present disclosure;

[0095] Fig.12 Another waveform simulation diagram of the intermediate frequency signal provided by the embodiment of the present disclosure;

[0096] Fig.13 Another waveform simulation diagram of the first voltage signal provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0097] The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

[0098] It should be clear that the following embodiments of the present disclosure are described by specific specific examples, and those skilled in the art can easily understand other advantages and effects of the present disclosure from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments. The present disclosure can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present disclosure. It should be noted that the following embodiments and features in the embodiments can be combined with each other in the absence of conflict. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present disclosure.

[0099] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein may be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present disclosure, it should be understood by those skilled in the art that an aspect described herein may be implemented independently of any other aspect, and two or more of these aspects may be combined in various ways. For example, any number of aspects described herein may be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein may be used to implement this device and / or practice this method.

[0100] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present disclosure. The drawings only show components related to the present disclosure rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0101] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects described may be practiced without these specific details.

[0102] Reference Figure 1 The present disclosure provides a multi-channel signal source phase calibration method, comprising the following steps:

[0103] S1: Receives multiple original signals output by a multi-channel signal source and divides them into a baseline group and a control group;

[0104] S2: By selecting original signals from the reference group and the control group and performing signal processing, the phase difference between the original signals is obtained, and the phase calibration of the multi-channel signal source is performed based on the phase difference.

[0105] Reference Figure 2 A flow chart of a signal processing method is shown, wherein the signal processing method comprises the following steps:

[0106] S3: extracting the original signals selected from the reference group and the control group to obtain reference signals and control signals;

[0107] S4: Mixing the reference signal and the control signal to obtain an intermediate frequency signal;

[0108] S5: extracting the voltage of the intermediate frequency signal to obtain a first voltage signal;

[0109] S6: Acquire a first voltage value of the first voltage signal;

[0110] S7: Obtaining a phase difference based on the first voltage value.

[0111] The present disclosure provides a multi-channel signal source phase calibration method, which can accurately obtain the phase difference between the original signals by dividing the multi-channel original signals output by the multi-channel signal source into a reference group and a control group, and performing detailed signal processing, including signal extraction, mixing processing and voltage extraction. This method provides high-precision data for phase calibration, thereby significantly improving the accuracy of calibration. By selecting the original signal and performing specific signal processing steps, the complex multiple manual operation process in the traditional calibration method is simplified, the possibility of human error is reduced, and the calibration process is more efficient and reliable. Traditional phase calibration methods usually require manual replacement of RF cables and multiple measurements, which is time-consuming and costly. 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 multi-channel phase difference 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 precise phase calibration, thereby improving the stability and reliability of the entire system. Moreover, this method is not only applicable to interferometer direction-finding systems, but can also be widely used in other fields that require phase calibration of multi-channel signal sources, 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 processes, this method is easy to integrate into existing measurement and calibration systems. At the same time, its modular design also facilitates functional expansion and upgrading to meet future calibration requirements with higher precision and complexity.

[0112] In summary, the multi-channel signal source phase calibration method uses accurate signal processing and phase difference calculation, YY+242294P-YX

[0113] It significantly improves calibration accuracy, simplifies the calibration process, reduces time and cost, improves system stability, and enhances system adaptability and ease of integration. It has broad application prospects in many fields such as electronic reconnaissance, radar systems, and wireless communications.

[0114] In S1, a number of first couplers equal to the number of signal source channels is set, each first coupler is responsible for receiving one original signal (i.e., RF signal) output by the multi-channel signal source, and multiple first couplers are divided into two groups, which are respectively connected to two different multiplexer input ends. Therefore, through the cooperation of two multiplexers and multiple first couplers, the multi-channel original signals can be divided into a reference group and a control group.

[0115] In S2, the first coupler extracts (i.e. couples) the received original signal, generates a main signal and a branch signal (i.e. coupled signal), and transmits the main signal to the device under test for use by the device under test. The controller selects the required original signal from the reference group and the control group by controlling the connection between the multiplexer and the first coupler, i.e., using the selection line of the multiplexer to select and connect the first coupler. In this process, the branch signal selected and separated from the reference group is defined as the reference signal, and the branch signal selected and separated from the control group is defined as the control signal.

[0116] Reference Figure 3 The schematic diagram of the 8-channel signal source phase calibration circuit is shown. RF1_IN, RF2_IN, ..., RF8_IN are the 8 original signals output by the 8-channel signal source. C1, C2, ..., C8 are 8 first couplers. The 8 first couplers are responsible for receiving one original signal and extracting part of the signal from the original signal, thereby coupling the original signal into the main signal and the branch signal. The 8 main signals are RF1_OUT, RF2_OUT, ..., RF8_OUT. S1 and S2 are multiplexers with 4 input terminals. The 4 input terminals of S1 are connected to C1, C2, C3 and C4 respectively, and the 4 input terminals of S2 are connected to C5, C6, C7 and C8 respectively. 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. MCU is a controller. MCU controls S1 to select the first coupler to be connected from C1, C2, C3 and C4, thereby obtaining the branch signal of the channel where the first coupler is located, and defines it as a reference signal. MCU controls S2 to select the first coupler to be connected from C5, C6, C7 and C8, thereby obtaining the branch signal of the channel where the first coupler is located, and defines it as a reference signal.

[0117] By selecting original signals from the reference group and the control group and performing signal processing respectively, the phase difference between the two required original signals can be obtained, and the phase calibration of the multi-channel signal source can be performed through the phase difference.

[0118] Reference Figure 4 The flowchart of the method for selecting the original signal and performing phase calibration is shown. In a first specific implementation scheme, the method for completing the phase calibration of the multi-channel signal source by selecting the original signal includes the following steps:

[0119] YY+242294P-YX

[0120] S201: Selecting an original signal from the reference group as a standard signal;

[0121] S202: Selecting one original signal from the control group as the signal to be adjusted;

[0122] S203: performing signal processing on the standard signal and the signal to be adjusted to obtain a phase difference between the standard signal and the signal to be adjusted;

[0123] S204: performing phase calibration on a signal source of the signal to be modulated based on the phase difference;

[0124] S205: After the signal source phase calibration of each original signal in the control group is completed, one original signal is selected from the control group as a new standard signal;

[0125] S206: selecting the remaining original signals from the reference group in sequence as new signals to be adjusted;

[0126] S207: performing signal processing on the new standard signal and the new signal to be adjusted to obtain a phase difference between the new standard signal and the new signal to be adjusted;

[0127] S208: performing phase calibration on the signal source of the new signal to be modulated 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.

[0128] In S201-S204, the control system of the multi-channel signal source controls the multi-channel signal source to output the original signal, and the control system sends a first channel switching instruction to the controller through the serial communication interface. The controller selects any original signal from the reference group as the standard signal according to the first channel switching instruction, or selects the original signal with the best performance (signal strength, noise level, frequency stability, specific frequency band and other indicators) as the standard signal. Based on the standard signal, the phase difference between each original signal in the control group and the standard signal is obtained in turn, and the phase difference is transmitted to the serial communication interface. The serial communication interface reports the phase difference to the control system, and the control system performs phase calibration on the signal source that transmits the signal to be adjusted according to the phase difference.

[0129] In S205-S208, after the phase calibration of the signal source of each original signal in the control group is completed, it means that the phase of each original signal in the control group and the standard signal has been unified. At this time, one original signal is selected from the control group as the new standard signal, and based on the new standard signal, the phase difference between the remaining original signals in the benchmark group (that is, the original signals remaining after excluding the initial standard signal in the benchmark group) and the new standard signal is obtained in turn, and the phase difference is transmitted to the serial communication interface, and the phase calibration of the signal source of the remaining original signals in the benchmark group is performed by reporting to the control system.

[0130] Reference Figure 3, take an 8-channel signal source as an example: the control system controls the multi-channel signal source to output 8 original signals, and sends the 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 the second channel switching instruction Ctrl3 to S1 to connect S1 and C1, and uses the original signal of the channel where C1 is located as the standard signal. The controller sends the third channel switching instruction Ctrl4 to S2 to connect S2 and C5, and uses the original signal of the channel where C5 is located as the waiting YY+242294P-YX

[0131] Signal processing is performed on the standard signal and the signal to be modulated to perform phase calibration on the signal source of the signal to be modulated, 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, S2 is connected to C6, C7 and C8 in sequence, so as to complete the phase alignment of channels 6, 7, 8 with channel 1 in sequence. The original signal after channel 8 calibration is selected as the new standard signal, S2 is always connected to C8, S1 is connected to C2, C3 and C4 in sequence, so as to complete the phase alignment of channels 2, 3, 4 with channel 8 in sequence, and the entire phase detection self-calibration process is completed. Among them, the channels where C1, C2, ..., C8 are located are channels 1, channel 2, ..., channel 8 respectively.

[0132] The above scheme can complete the phase calibration by group, that is, first calibrate the signal sources of all the original signals in the control group, and then calibrate the signal sources of the remaining original signals in the reference group. In the entire calibration process, the number of controls on S1 and S2 is very small, and the number of calculations of the phase difference is also very small. Therefore, the overall calibration time will be very short, which can effectively improve the speed and efficiency of the calibration.

[0133] Reference Figure 5 Another flow chart of the method for selecting an original signal and performing phase calibration is shown. In a second specific implementation scheme, the method for completing the phase calibration of a multi-channel signal source by selecting an original signal includes the following steps:

[0134] S211: Setting the calibration order with one original signal in the reference group as the first;

[0135] S212: in the calibration sequence, the original signal included in the reference group and the original signal included in the control group are set alternately;

[0136] S213: taking the i-th original signal in the calibration sequence as the standard signal, i is initially 1, and 1≤i≤I;

[0137] S214: taking the i+1th original signal in the calibration sequence as the signal to be calibrated;

[0138] S215: performing signal processing on the standard signal and the signal to be adjusted to obtain a phase difference between the standard signal and the signal to be adjusted;

[0139] S216: performing phase calibration on a signal source of the signal to be modulated based on the phase difference;

[0140] S217: After the phase calibration is completed, i is increased by 1, and a new standard signal and a new signal to be adjusted are selected according to the calibration sequence until i is equal to I.

[0141] In S211-S217, firstly, based on one original signal in the reference group, the signal source of one original signal in the control group is phase-calibrated, and then based on the original signal emitted by the calibrated signal source, the signal source of one original signal in the reference group is phase-calibrated, and based on the original signal emitted by the newly calibrated signal source, the signal source of another original signal in the control group is phase-calibrated, and so on, the signal sources of the original signals in the reference group and the control group are cross-phase calibrated, thereby completing the calibration of the entire multi-channel signal source.

[0142] Reference Figure 3 , take an 8-channel signal source as an example: the preset calibration order is channel 1-channel 8-channel YY+242294P-YX

[0143] 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 the 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 the second channel switching instruction Ctrl3 to S1 to connect S1 and C1, and uses the original signal of the channel where C1 is located as the standard signal. The controller sends the third channel switching instruction Ctrl4 to S2 to connect S2 and C8, and uses the original signal of the channel where C8 is located as the signal to be adjusted. Signal processing is performed on the standard signal and the signal to be adjusted to perform phase calibration on 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, S2 is connected to C8, and S1 is connected to C2 instead, so that the phase of channel 2 is aligned with the phase of channel 8. And so on, the phase calibration of all signal sources is completed step by step according to the calibration sequence.

[0144] The above scheme can realize cross-phase calibration between multi-channel signal sources. In this process, the number of changes to the S1 and S2 selection lines is very small, and the phase difference calculation is also very small, so the overall calibration time will be very short, achieving efficient calibration.

[0145] Reference Figure 6Another flow chart of the method for selecting an original signal and performing phase calibration is shown. In a third specific implementation scheme, the method for completing the phase calibration of a multi-channel signal source by selecting an original signal comprises the following steps:

[0146] S221: select one original signal from the control group as a reference signal;

[0147] S222: Obtaining a phase difference between each original signal in the reference group and the reference signal according to a signal processing method, recorded as a first phase difference;

[0148] 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;

[0149] S224: Acquire a phase difference between the standard signal and the signal to be adjusted based on the first phase difference, and record it as a second phase difference;

[0150] S225: performing phase calibration on a signal source of the signal to be modulated based on the second phase difference;

[0151] S226: Select one original signal from the control group in turn as a new signal to be adjusted;

[0152] S227: Obtaining a phase difference between the standard signal and the new signal to be adjusted according to a signal processing method, and recording it as a third phase difference;

[0153] S228: Perform phase calibration on a signal source of a new signal to be modulated based on the third phase difference.

[0154] In S221-S228, the second phase difference between the standard signal and the signal to be adjusted is equal to the difference between the first phase difference between the standard signal and the reference signal minus the first phase difference between the signal to be adjusted and the reference signal, and the phase of the signal source of the signal to be adjusted is calibrated based on the second phase difference.

[0155] Based on one original signal (i.e., standard signal) in the group, phase calibration is performed on the signal sources of the remaining original signals in the reference group. After the calibration is completed, phase calibration is performed on the signal sources of the original signals in the control group in turn based on the standard signal.

[0156] Reference Figure 3, take an 8-channel signal source as an example: obtain the first phase difference between RF1_IN, RF2_IN, RF3_IN, RF4_IN and RF8_IN respectively; 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 minus the first phase difference between RF2_IN and RF8_IN, and the phase of the RF2_IN signal source is calibrated based on the second phase difference between RF1_IN and RF2_IN; the second phase difference between RF1_IN and RF3_IN is equal to RF The first phase difference between RF1_IN and RF8_IN is equal to the difference between the first phase difference between RF3_IN and RF8_IN, and the signal source of RF3_IN is phase-calibrated based on the second phase difference between RF1_IN and 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, and the signal source of RF4_IN is phase-calibrated based on the second phase difference between RF1_IN and RF4_IN. The third phase differences between RF1_IN and RF5_IN, RF6_IN, RF7_I, and RF8_IN are obtained in sequence, wherein the third phase difference between RF1_IN and RF8_IN is the first phase difference between RF1_IN and RF8_IN obtained previously, and the signal sources of RF5_IN, RF6_IN, RF7_I, and RF8_IN are phase-calibrated in sequence based on these third phase differences.

[0157] The above solution can realize phase calibration according to the order of the multi-channel signal source itself, meeting the special needs of users.

[0158] Based on the actual needs of users, the above three specific implementation schemes can be modified or combined to meet the user's needs for overall calibration speed, efficiency, sequence, etc. It can be seen that the multi-channel signal source phase calibration method disclosed in the present invention has great flexibility and extensibility, and is applicable to a variety of demand scenarios.

[0159] Next, the signal processing method is described in detail:

[0160] In S3, signal extraction is performed on the original signal selected from the reference group to obtain a reference signal, and signal extraction is performed on the original signal selected from the control group to obtain a control signal.

[0161] In S4, refer to Figure 7 The flow chart of the mixing processing method shown, "mixing the reference signal and the control signal to obtain the intermediate frequency signal" includes the following steps:

[0162] S41: respectively adjusting the power of the reference signal and the control signal to obtain a first detection signal and a second detection signal;

[0163] S42: respectively coupling the first detection signal and the second detection signal to obtain a first direct signal and a second direct signal;

[0164] YY+242294P-YX

[0165] S43: Mix the first direct-pass signal and the second direct-pass signal to obtain an intermediate frequency signal.

[0166] In S41-S43, refer to Figure 3 , two attenuators, two amplifiers, two second couplers and a mixer are provided, wherein 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 the present disclosure are essentially directional couplers, but for the sake of easy distinction, they are marked with "first" and "second".

[0167] Ta and Pa are used together to adjust the power of the reference signal to obtain a first detection signal, and Tb and Pb are used together to adjust the power of the control signal to obtain a second detection signal, wherein Ta and Tb are used to attenuate the power of the reference signal and the control signal, and Pa and Pb are used to increase the power of the reference signal and the control signal. By attenuating and increasing the power, the power of the reference signal and the control signal can be adjusted to a range suitable for subsequent detection.

[0168] 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.

[0169] Since the first direct signal, the second direct signal and the intermediate frequency signal are signals that vary with time, the first direct signal can be defined as RF(t), the second direct signal can be defined as LO(t), and the intermediate frequency signal can be defined as IF(t).

[0170] Among them, the expression of the first direct signal is:

[0171] RF(t)=cos(2*π*f*t+φ1); (Formula 1)

[0172] In Formula 1, t represents the signal duration; π represents the circumference of a circle; and φ1 represents the initial phase of the first direct-pass signal.

[0173] The expression of the second direct signal is:

[0174] LO(t)=cos(2*π*f*t+φ2); (Formula 2)

[0175] In Formula 2, φ2 represents the initial phase of the second through signal.

[0176] The expression of the intermediate frequency signal is:

[0177] IF(t)=RF(t)*LO(t)=(1 / 2)*[cos(4*π*f*t+φ1+φ2)+cos(φ1-φ2)]. (Formula 3)

[0178] In S5, refer to Figure 3 , a low-pass filter F1 is set, F1 can filter out high-frequency components and retain DC voltage information. Therefore, by performing voltage extraction on the intermediate frequency signal through F1, a voltage signal can be obtained, which is recorded as the first voltage signal V1, and its expression is:

[0179] V1=(1 / 2)*cos(φ1-φ2). (Formula 4)

[0180] In S6, refer to Figure 3 , set a first analog-to-digital converter ADC1, ADC1 can convert the analog voltage signal into a digital signal, so the voltage value of the first voltage signal can be obtained through ADC1, and the voltage YY+242294P-YX

[0181] The value is recorded as the first voltage value v1, and its expression is:

[0182] v1=V ref1 *Value1 / 2^ N1 ;(Formula 5)

[0183] 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 and read by the MCU; N1 represents the number of quantization bits, specifically the number of quantization bits of ADC1.

[0184] In S7, after obtaining v1, the MCU can calculate the phase difference △φ' between the first direct signal and the second direct signal by formula 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:

[0185] △φ=△φ'=φ1-φ2=arccos(2*v1). (Formula 6)

[0186] Reference Figure 8The waveform simulation diagram of the RF and LO phase difference of 30 degrees is shown. Fig. 9 The waveform simulation diagram of the RF and LO mixed with a phase difference of 30 degrees is shown, that is, the waveform simulation diagram of the intermediate frequency signal. Fig.10 The waveform simulation diagram of the intermediate frequency signal after low-pass filtering is shown, that is, the waveform simulation diagram of the first voltage signal. When the phase difference between the first direct-pass signal and the second direct-pass signal is 30 degrees, V1=(1 / 2)*cos(30°)≈0.433.

[0187] Reference Fig.11 The waveform simulation diagram of RF and LO phase difference of 60 degrees is shown. Fig.12 The waveform simulation diagram of the RF and LO mixing with a phase difference of 60 degrees is another waveform simulation diagram of the intermediate frequency signal. Fig.13 The waveform simulation diagram of the intermediate frequency signal after low-pass filtering is shown, that is, another waveform simulation diagram of the first voltage signal. When the phase difference between the first direct-pass signal and the second direct-pass signal is 60 degrees, V1=(1 / 2)*cos(60°)≈0.25.

[0188] Through the above method, two original signals are selected for coupling, and only the separated branch signals are processed, and the main signal is supplied to the device under test to avoid affecting the operation of the device under test. The power of the two separated branch signals is adjusted so that the subsequent mixer can perform mixing processing between the first direct-through signal and the second direct-through signal to obtain an intermediate frequency signal. By extracting the voltage and converting the value of 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.

[0189] In traditional technology, it is a complex and tedious task for the vector network analyzer (VNA) to correct the phase error between channels of a multi-channel signal source. As a high-precision measuring instrument, the vector network analyzer can provide accurate phase error calibration, but it is expensive. Taking an 8-channel signal source as an example, it is usually necessary to use channel 1 as a reference and calibrate channels 2 to 8 in sequence. After each calibration, the RF cable needs to be manually replaced, which makes the entire calibration process very cumbersome and time-consuming. Since a complete calibration process is very complicated, all the frequency points that need to be used are usually calibrated at one time. However, the more frequencies to be calibrated, the longer it takes. Although this method can ensure the phase error of all frequencies, it is not easy to calibrate.

[0190] The error can be corrected, but the time and operation cost are high.

[0191] The multi-channel signal source phase calibration method disclosed in the present invention not only uses low-cost components, but also does not require manual replacement of RF cables. The multi-channel signal source can automatically complete real-time phase calibration without affecting the normal use of the device under test. The calibration process is automatically completed before the signal is output, so each time only the frequency point to be used needs to be calibrated, and the speed is very fast.

[0192] Further, refer to Figure 3 , Ca couples the first detection signal to obtain not only the first direct signal RF but also the first coupled signal, Cb couples the second detection signal to obtain not only the second direct signal LO but also the second coupled signal. Two detectors, a second analog-to-digital converter and a third analog-to-digital converter are set, wherein 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 performs power conversion on the first coupled signal to obtain the second voltage signal V2, and Lb performs power conversion on 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.

[0193] MCU obtains the power P1 of the second voltage signal based on v2 acq , according to P1 acq The power attenuation required to obtain the reference signal is the power attenuation of Ta, △P1. The MCU obtains the power P2 of the third voltage signal based on v3. acq , according to P2 acq The power attenuation amount required to obtain the control signal, that is, the power attenuation amount ΔP2 of Tb.

[0194] Among them, the output voltage VLa of La is acq The relationship is:

[0195] VLa=K1*P1 acq ;(Formula 7)

[0196] In Formula 7, K1 is a constant coefficient of La, which can be obtained from the chip manual of La or through measurement.

[0197] The expression of v2 is:

[0198] v2=V ref2 *Value2 / 2^ N2 ;(Formula 8)

[0199] In formula 8, V ref2 represents the base reference voltage of ADC2; Value2 represents the voltage quantization value of the second voltage signal, specifically the voltage quantization value collected by ADC2 and read by the MCU; N2 represents the number of quantization bits of ADC2.

[0200] By solving Formula 7 and Formula 8, we can get P1 acq The value of is calculated as follows:

[0201] P1 acq = (V ref2 *Value2 / 2^ N2 ) / K1; (Formula 9)

[0202] The calculation formula of △P1 is:

[0203] △P1=P1 acq -P1 set ;(Formula 10)

[0204] In formula 10, P1 set is the first preset value.

[0205] MCU generates the first control signal Ctrl1 through △P1. The corresponding relationship between Ctrl1 and △P1 can be obtained from the chip manual of Ta. Ctrl1 is sent to Ta, and Ta adjusts the power required for the reference signal according to Ctrl1.

[0206] Rate attenuation.

[0207] Among them, the output voltage VLb of Lb is related to P2 acq The relationship is:

[0208] VLb=K2*P2 acq ;(Formula 11)

[0209] In Formula 7, K2 is a constant coefficient of Lb, which can be obtained from the chip manual of Lb or through measurement.

[0210] The expression of v3 is:

[0211] v3=V ref3 *Value3 / 2^ N3 ;(Formula 12)

[0212] In formula 8, V ref3 represents the base reference voltage of ADC3; Value3 represents the voltage quantization value of the second voltage signal, specifically the voltage quantization value collected by ADC3 and read by the MCU; N3 represents the quantization bit number of ADC3.

[0213] By solving Formula 11 and Formula 12, we can get P2 acq The value of is calculated as follows:

[0214] P2 acq = (V ref3*Value3 / 2^ N3 ) / K2; (Formula 9)

[0215] The calculation formula of △P2 is:

[0216] △P2=P2 acq -P2 set ;(Formula 10)

[0217] In formula 10, P2 set is the second preset value.

[0218] MCU generates a second control signal Ctrl2 through △P2. The corresponding relationship between Ctrl2 and △P2 can be obtained from the chip manual of Tb. Ctrl2 is sent to Tb, and Tb adjusts the power attenuation required for the control signal according to Ctrl2.

[0219] Reference Figure 3 , the present disclosure provides a multi-channel signal source phase calibration system, comprising 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;

[0220] The input end of each first coupler is connected to the output end of a signal source of a different channel, and the plurality of first couplers respectively receive one channel of original signal output by the multi-channel signal source;

[0221] 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 a multiplexer, the output end of the other group of first couplers is connected to the input end of another multiplexer, and the two multiplexers and the plurality of first couplers divide the multi-channel original signals into a reference group and a control group;

[0222] The output ends of the two multiplexers are connected to the input end of the mixing module, and the two multiplexers are wirelessly connected to the controller. The controller selects original signals from the reference group and the control group and performs signal processing to obtain the phase difference between the original signals by controlling the connection between the two multiplexers and the first coupler.

[0223] The frequency 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 a control system of a multi-channel signal source;

[0224] The serial communication interface performs phase calibration on a multi-channel signal source based on phase difference;

[0225] Among them, signal processing includes:

[0226] Two first couplers respectively connected to the two multiplexers extract the received original signal to obtain a reference signal and a control signal;

[0227] The mixing module performs mixing processing on the reference signal and the control signal respectively to obtain an intermediate frequency signal;

[0228] The low-pass filter performs voltage extraction on the intermediate frequency signal to obtain a first voltage signal;

[0229] The first analog-to-digital converter obtains a first voltage value of the first voltage signal;

[0230] The controller acquires a phase difference based on the first voltage value and transmits the phase difference to the serial communication interface.

[0231] Wherein, the mixing module includes two attenuators, two amplifiers, two second couplers and a mixer;

[0232] The input ends of the two attenuators are connected to the output ends of the two multiplexers respectively, the input ends of the two amplifiers are connected to the output ends of the two attenuators respectively, the output ends of the two second couplers are connected to the output ends of the two amplifiers respectively, 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;

[0233] Two attenuators and two amplifiers respectively adjust the power of the reference signal and the control signal to obtain a first detection signal and a second detection signal;

[0234] The two second couplers couple the first detection signal and the second detection signal respectively to obtain a first direct-through signal and a second direct-through signal;

[0235] The mixer mixes the first direct-through signal and the second direct-through signal to obtain an intermediate frequency signal.

[0236] The multi-channel signal source phase calibration system also includes two detectors, a second analog-to-digital converter and a third analog-to-digital converter;

[0237] 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;

[0238] 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;

[0239] The second coupler couples the first detection signal and the second detection signal respectively to obtain a first coupled signal and a second coupled signal;

[0240] The two detectors perform power conversion on the first coupled signal and the second coupled signal respectively to obtain a second voltage signal and a third voltage signal;

[0241] YY+242294P-YX

[0242] The second analog-to-digital converter and the third analog-to-digital converter respectively obtain a second voltage value of the second voltage signal and a third voltage value of the third voltage signal;

[0243] 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 power attenuation required for the reference signal and the control signal based on the power of the second voltage signal and the third voltage signal.

[0244] The various variations and specific examples of the multi-channel signal source phase calibration method provided above are also applicable to the multi-channel signal source phase calibration system provided in the present invention. Through the above detailed description of the multi-channel signal source phase calibration method, 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 described in detail here.

[0245] The basic principles of the present disclosure are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present disclosure are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present disclosure. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, and are not limiting. The above details do not limit the present disclosure to the necessity of adopting the above specific details to be implemented.

[0246] In the present disclosure, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. The block diagrams of the devices, devices, equipment, and systems involved in the present disclosure are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, devices, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them.

[0247] Additionally, as used herein, "or" used in a list of items beginning with "at least one" indicates a separate list, so that, for example, a list 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). Furthermore, the word "exemplary" does not mean that the example described is preferred or better than other examples.

[0248] It should also be noted that in the system and method of the present disclosure, each component or each step can be decomposed and / or recombined. Such decomposition and / or recombination should be regarded as equivalent solutions of the present disclosure.

[0249] Various modifications of the technology described herein may be made without departing from the technology of the teachings defined by the appended claims.

[0250] Various changes, substitutions and modifications are contemplated herein. Furthermore, the scope of the claims of the present disclosure is not limited to the specific aspects of the processes, machines, manufactures, compositions of events, means, methods and actions described above. Currently existing or later to be developed processes, machines, manufactures, compositions of events, means, methods or actions that perform substantially the same functions or achieve substantially the same results as the corresponding aspects described herein may be utilized. Thus, the appended claims include within their scope such processes, machines, manufactures, compositions of events, means, methods or actions.

[0251] The above 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 may be applied to other aspects without departing from the scope of the present disclosure. Therefore, the present disclosure is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0252] The above description has been given for the purpose 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 multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A multi-channel signal source phase calibration method, characterized in that: include: receiving multiple original signals output by a multi-channel signal source and dividing the signals into a reference group and a control group; By selecting original signals from the reference group and the control group and performing signal processing, a phase difference between the original signals is obtained, and phase calibration is performed on the multi-channel signal source based on the phase difference; Wherein, the signal processing includes: Extracting 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; Acquire a first voltage value of the first voltage signal; The phase difference is acquired based on the first voltage value.

2. The multi-channel signal source phase calibration method according to claim 1, characterized in that: By selecting the original signal from the reference group and the control group, comprising: Selecting an original signal from the reference group as a standard signal; Selecting one original signal from the control group in turn as the signal to be adjusted; Performing signal processing on the standard signal and the signal to be adjusted to obtain a phase difference between the standard signal and the signal to be adjusted; Performing phase calibration on a signal source of the signal to be modulated based on the phase difference; After the signal source phase calibration of each original signal in the control group is completed, one original signal is selected from the control group as a new standard signal; Selecting the remaining original signals from the reference group in turn as new signals to be adjusted; Performing signal processing on the new standard signal and the new signal to be adjusted to obtain a phase difference between the new standard signal and the new signal to be adjusted; The signal source of the new signal to be modulated is phase-calibrated 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 the original signal from the reference group and the control group, comprising: Setting a calibration order with one original signal in the reference group as the first; In the calibration sequence, the original signals included in the reference group and the original signals included in the control group are alternately arranged; The i-th original signal in the calibration sequence is used as the standard signal, i is initially 1, and 1≤i≤I; Taking the i+1th original signal in the calibration sequence as the signal to be calibrated; Performing signal processing on the standard signal and the signal to be adjusted to obtain a phase difference between the standard signal and the signal to be adjusted; Performing phase calibration on a signal source of the signal to be modulated based on the phase difference; After the phase calibration is completed, i is increased by 1, and a new standard signal and a new signal to be adjusted are selected 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 the original signal from the reference group and the control group, comprising: Selecting one original signal from the control group as a reference signal; According to the signal processing method, a phase difference between each original signal in the reference group and the reference signal is obtained, which is recorded as a first phase difference; Selecting 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, a phase difference between the standard signal and the signal to be adjusted is obtained, which is recorded as a second phase difference; Performing phase calibration on a signal source of the signal to be modulated based on the second phase difference; Selecting one original signal from the control group in turn as a new signal to be adjusted; According to the signal processing method, a phase difference between the standard signal and the new signal to be adjusted is obtained, which is recorded as a third phase difference; A phase calibration is performed on a signal source of a new signal to be modulated based on the third phase difference.

5. The multi-channel signal source phase calibration method according to claim 1, characterized in that: The mixing process of the reference signal and the control signal to obtain an intermediate frequency signal includes: respectively adjusting the power of 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; The first direct-through signal and the second direct-through signal are mixed to obtain the intermediate frequency signal.

6. The multi-channel signal source phase calibration method according to claim 5, characterized in that: The expression of the first direct signal is: Wherein, RF(t) represents the first direct signal; t represents the duration of the signal; π represents the circumference of a circle; represents the initial phase of the first direct signal; The expression of the second direct signal is: Wherein, LO(t) represents the second through signal; represents the initial phase of the second through signal; The expression of the intermediate frequency signal is: Wherein, IF(t) represents the intermediate frequency signal.

7. The multi-channel signal source phase calibration method according to claim 6, characterized in that: The expression of the first voltage signal is: Wherein, V1 represents a first voltage signal; The expression of the first voltage value is: v1=V ref1 *Value1 / 2^ N1 ; 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 number of quantization bits; The expression of the phase difference is: in, represents the phase difference between the original signals selected from the reference group and the control group; represents the phase difference between the first direct signal and the second direct signal.

8. The multi-channel signal source phase calibration method according to claim 5, characterized in that: Also includes: By coupling the first detection signal and the second detection signal, a first coupled signal and a second coupled signal are obtained; Performing power conversion on the first coupled signal and the second coupled signal respectively to obtain a second voltage signal and a third voltage signal; Acquire a second voltage value of the second voltage signal and a third voltage value of the third voltage signal; Based on the second voltage value and the third voltage value, the second voltage signal and the third YY+242294P-YX are obtained. The power of the voltage signal; The power attenuation amounts required for the reference signal and the control signal are adjusted based on the powers of the second voltage signal and the third voltage signal.

9. A multi-channel signal source phase calibration system, characterized in that: It includes a plurality of first couplers, two multiplexers, a controller, a frequency 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, and 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 another multiplexer; The output ends of the two multiplexers are both connected to the input end of the frequency mixing module, and the two multiplexers are both wirelessly connected to the controller; The frequency 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 a control system of a multi-channel signal source.

10. The multi-channel signal source phase calibration system according to claim 9, characterized in that: The mixing module includes two attenuators, two amplifiers, two second couplers and a mixer; The input ends of the two attenuators are connected to the output ends of the two multiplexers respectively, the input ends of the two amplifiers are connected to the output ends of the two attenuators respectively, the output ends of the two second couplers are connected to the output ends of the two amplifiers respectively, 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.

11. The multi-channel signal source phase calibration system according to claim 10, characterized in that: The multi-channel signal source phase calibration system also 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, 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; The controller is connected to an output end of the second analog-to-digital converter and an output end of the third analog-to-digital converter.

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