CN115754488B - Antenna calibration method, device and storage medium - Google Patents
Antenna calibration method, device and storage medium Download PDFInfo
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Abstract
The application provides an antenna calibration method, an antenna calibration device and a storage medium. The method comprises the following steps: acquiring a reference signal, current phase range information and a first channel and a second channel of an antenna; performing phase division processing on the current phase range information based on a dichotomy to determine a plurality of target phase values; performing phase shifting processing on the reference signal according to the target phase values to obtain a plurality of phase-shifted signals; inputting a reference signal into a first channel, and performing first phase shift processing to obtain a first target signal; respectively inputting the plurality of phase-shifted signals into a second channel, and performing second phase-shifting processing to obtain a plurality of second target signals; determining current phase shift calibration information between the first channel and the second channel according to the first target signal and the plurality of second target signals; and when the preset iteration condition is not met, returning the current phase shift calibration information serving as current phase range information to the step of determining a plurality of target phase values. The invention greatly improves the measuring speed and efficiency of the phased array.
Description
Technical Field
The present invention relates to the field of antenna testing, and in particular, to an antenna calibration method, an apparatus, and a storage medium.
Background
A phased array antenna is an antenna system whose radiating portion can be divided into a number of phase-controlled channel excitations. The common phased array antenna mainly comprises an antenna array surface, a phase shifter, a feed network, a corresponding control circuit and the like. Because of the complexity of the phased array antenna system, the components of each stage are not perfectly connected, and certain nonlinear operating characteristics exist between the components, during the operation of the phased array antenna, in order to ensure stable performance of the phased array antenna within the range of technical conditions, the amplitude and phase calibration or test must be performed on each antenna port.
Most of the current antenna array correction methods are based on digital beam forming antenna arrays for correction, and the amplitude and phase of signals received by each array element are required to be known. And the near field scanning correction method has complex equipment and low efficiency.
Disclosure of Invention
In view of this, the application provides an antenna calibration method, an antenna calibration device and a storage medium, which at least can solve the technical problem of low efficiency of the existing antenna calibration test.
According to an aspect of the present application, there is provided an antenna calibration method, including:
acquiring a reference signal, current phase range information and a first channel and a second channel of an antenna;
Performing phase division processing on the current phase range information based on a dichotomy to determine a plurality of target phase values;
performing phase shifting processing on the reference signal according to a plurality of target phase values to obtain a plurality of phase-shifted signals;
inputting the reference signal into the first channel, and performing first phase shift processing to obtain a first target signal;
respectively inputting a plurality of phase-shifting signals into the second channel, and performing second phase-shifting processing to obtain a plurality of second target signals;
determining current phase shift calibration information between the first channel and the second channel according to the first target signal and the plurality of second target signals;
and when the preset iteration condition is not met, taking the current phase shift calibration information as current phase range information, returning to the step of carrying out phase division processing on the current phase range information based on the dichotomy, and determining a plurality of target phase values until the preset iteration condition is met, and taking the current phase shift calibration information corresponding to the preset iteration condition as antenna calibration information.
In one possible implementation manner, the determining phase shift calibration information between the first channel and the second channel according to the first target signal and the plurality of second target signals includes:
Synthesizing the first target signal and a plurality of second target signals respectively to obtain a plurality of synthesized signals;
determining said phase shift calibration information between said first channel and said second channel from a plurality of said composite signals.
In one possible implementation, the determining the phase shift calibration information between the first channel and the second channel according to a plurality of the composite signals includes:
determining the amplitudes of a plurality of the composite signals, respectively;
determining said phase shift calibration information between said first channel and said second channel based on the magnitudes of a plurality of said composite signals.
In one possible implementation manner, after determining the current phase shift calibration information between the first channel and the second channel according to the first target signal and the plurality of second target signals, the method further includes:
determining the information type of the current phase shift calibration information;
determining the iterated times under the condition that the information type is an interval type;
when the preset iteration condition is not satisfied, the step of using the current phase shift calibration information as the current phase range information includes: and when the iterated times are smaller than the preset iterated times, taking the current phase shift calibration information as the current phase range information.
In one possible implementation, the plurality of target phase values includes a section left end point value, a section right end point value, and a section middle point value of the current phase range information.
In one possible implementation, after the determining the information type of the current phase shift calibration information, the method further includes:
and under the condition that the information type is a numerical value type, determining that the preset iteration condition is met, and taking the current phase shift calibration information corresponding to the condition that the preset iteration condition is met as the antenna calibration information.
In one possible implementation, acquiring the first channel and the second channel of the antenna includes:
two adjacent channels are selected from the plurality of channels of the antenna as the first channel and the second channel.
According to another aspect of the present application, an antenna calibration device comprises:
the acquisition module is used for acquiring the reference signal, the current phase range information and the first channel and the second channel of the antenna;
the first determining module is used for carrying out phase division processing on the current phase range information based on a dichotomy and determining a plurality of target phase values;
the second determining module is used for carrying out phase shifting processing on the reference signal according to a plurality of target phase values to obtain a plurality of phase shifting signals;
The third determining module is used for inputting the reference signal into the first channel, and performing first phase shifting processing to obtain a first target signal;
a fourth determining module, configured to input a plurality of phase-shifted signals to the second channel, and perform a second phase-shift process to obtain a plurality of second target signals;
a fifth determining module, configured to determine current phase shift calibration information between the first channel and the second channel according to the first target signal and the plurality of second target signals;
and the triggering module is used for triggering the first determining module by taking the current phase shift calibration information as the current phase range information when the preset iteration condition is not met until the preset iteration condition is met, and taking the current phase shift calibration information corresponding to the preset iteration condition as the antenna calibration information.
In one possible implementation manner, the fifth determining module includes:
the first determining unit is used for respectively synthesizing the first target signal and a plurality of second target signals to obtain a plurality of synthesized signals;
and a second determining unit configured to determine the phase shift calibration information between the first channel and the second channel based on a plurality of the synthesized signals.
According to another aspect of the present application, there is provided a non-transitory computer readable storage medium having stored thereon computer program instructions which, when executed by a processor, implement the above-described method.
The invention determines phase shift calibration information based on a dichotomy without determining specific amplitudes and specific phases of the first channel input signal (reference signal) and the second channel input signal (phase shift signal). Knowing the phase difference (target phase value) of the first channel input signal and the second channel input signal in advance, comprehensively analyzing the first target signal and the plurality of second target signals after obtaining the first target signal and the plurality of second target signals, and determining phase shift calibration information between the first channel and the second channel; the method provided by the invention is simple and efficient in operation, overcomes the defect of long time consumption of the existing calibration technology, and greatly improves the measuring speed and efficiency of the phased array.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a phased array antenna and a receiving antenna device.
Fig. 2 is a flow chart illustrating a method of antenna calibration according to an exemplary embodiment.
Fig. 3 is a flow chart illustrating an antenna calibration method according to another exemplary embodiment.
Fig. 4 is a flowchart illustrating a method for determining phase shift calibration information in an antenna calibration method according to yet another exemplary embodiment.
Fig. 5 is a flow chart illustrating an antenna calibration method according to yet another exemplary embodiment.
Fig. 6 is a block diagram illustrating an antenna calibration device according to an exemplary embodiment.
Detailed Description
Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers indicate identical or functionally similar elements. Although various aspects of the embodiments are illustrated in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
The word "exemplary" is used herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
In addition, numerous specific details are set forth in the following detailed description in order to provide a better understanding of the present application. It will be understood by those skilled in the art that the present application may be practiced without some of these specific details. In some instances, methods, means, elements, and circuits have not been described in detail as not to unnecessarily obscure the present application.
In order to improve the speed and efficiency of phased array antenna calibration, the invention provides an antenna calibration method, an antenna calibration device and a storage medium.
Referring to fig. 1 to 5, an antenna calibration method provided in an embodiment of the present disclosure includes:
step S101: and acquiring the reference signal, the current phase range information and the first channel and the second channel of the antenna.
The present embodiment may be applied to a phased array antenna 200, and the phased array antenna 200 refers to an antenna in which the pattern shape is changed by controlling the feed phase of a radiating element in the array antenna. The receiving antenna device 300 may receive the antenna signal emitted by the phased array antenna 200, and the receiving antenna device 301 may include a receiving antenna 301 and a spectrometer 302. The phased array antenna may be provided with a plurality of channels 201, each channel 201 being configured to phase-shift an input signal of a channel, and phase-shift values corresponding to the plurality of channels 201 may be different. Two channels may be selected among the plurality of channels 201 as the first channel and the second channel, respectively.
In the embodiment of the present disclosure, the reference signal may refer to an active signal, and may be periodically changed in the form of a cosine signal. The reference signal may be generated by a signal generator or may be obtained by the signal source 201.
The current phase range information may refer to a known range of a difference between the first channel phase shift value and the second channel phase shift value, and may be determined according to user input information; the current phase range information may be set to 0, 360 in the first calibration, and the difference range determined by the previous calibration may be used as the current phase range information in the calibration process after the first calibration.
Step S102: and carrying out phase division processing on the current phase range information based on a dichotomy, and determining a plurality of target phase values.
Dichotomy is a high-efficiency search algorithm based on mathematical principles, which can find specific elements in ordered groups. In the embodiment of the present specification, the current phase range information may be subjected to a phase division process based on a dichotomy, and a plurality of target phase values may be determined through the phase division process. The left end point, right end point, and middle point of the phase range information to be processed may be determined as target phase values.
Step S103: and performing phase shifting processing on the reference signal according to the target phase values to obtain a plurality of phase-shifted signals.
In the embodiment of the present specification, the phase shift process may refer to a phase reduction process. The phase-shifted signal may refer to a signal obtained by reducing the phase of the reference signal, and the reduced phase value may be the target phase value obtained in step S102. One target phase value corresponds to one phase shifted signal. The phase differences between the plurality of phase-shifted signals and the reference signal are the plurality of target phase values obtained in step S102, respectively.
Step S104: and inputting the reference signal into the first channel, and performing first phase shifting processing to obtain a first target signal.
In this embodiment of the present disclosure, the reference signal may be used as a first channel input signal, and the first channel may perform a first phase shift process on the reference signal to obtain a first target signal, and may obtain relevant information (such as direction information, amplitude information, and phase information) of the first target signal through the spectrometer 302.
Step S105: and respectively inputting the plurality of phase-shifted signals into a second channel, and performing second phase-shifting processing to obtain a plurality of second target signals.
In this embodiment of the present disclosure, the phase-shifted signal may be used as an input signal of a second channel, and the second channel may perform a second phase-shift process on the plurality of phase-shifted signals, so as to obtain a plurality of second target signals, and may obtain relevant information (such as direction information, amplitude information, and phase information) of the second target signals through the spectrometer 302.
Step S106: current phase shift calibration information between the first channel and the second channel is determined based on the first target signal and the plurality of second target signals.
In this embodiment of the present disclosure, the phase shift calibration information may refer to a difference value or a section where the difference value exists between the phase shift value of the first channel and the phase shift value of the second channel. The phase shift calibration information may be determined by analyzing the first target signal and the plurality of second target signals in terms of phase, amplitude, direction, etc. by a signal analyzer.
Step S107: and when the preset iteration condition is not met, taking the current phase shift calibration information as current phase range information, returning to the step S102 until the preset iteration condition is met, and taking the current phase shift calibration information corresponding to the preset iteration condition as antenna calibration information.
In this embodiment of the present disclosure, the preset iteration condition may be that the iteration number reaches the preset iteration number, and the more the iteration number is, the more accurate the phase shift calibration information is. When the preset iteration condition is not met, the next calibration can be performed on the first channel and the second channel, the current phase shift calibration information is used as current phase range information, a target phase value is determined again based on a dichotomy, and further the phase shift calibration information is accurate. When the preset iteration condition is met, the current phase-shift calibration information can be used as antenna calibration information, and the antenna calibration information meets the calibration precision requirement.
In one possible implementation, after the preset iteration condition is met and the antenna calibration information is obtained, two channels may be selected from the multiple channels 201 of the phased array antenna, and used as the first channel and the second channel, respectively, and calibrated. For example, a phased array antenna includes channel a, channel B, channel C, and channel D; firstly, selecting a channel A and a channel B as a first channel and a second channel respectively, and calibrating the channel A and the channel B to obtain corresponding antenna calibration information; after the channel A and the channel B are calibrated, the channel B and the channel C can be selected as a first channel and a second channel respectively, and the channel B and the channel C are calibrated to obtain corresponding antenna calibration information; after the channel B and the channel C are calibrated, the channel C and the channel D can be selected as a first channel and a second channel respectively, and the channel C and the channel D are calibrated to obtain corresponding antenna calibration information; and the antenna calibration information between every two channels in the phased array antenna can be obtained by performing traversal calibration on every two channels in the phased array antenna.
In the existing antenna array correction method, the amplitude and the phase of the signal received by each array element are required to be known, and the method and the equipment are complex and have low efficiency. While the present embodiment determines phase shift calibration information based on a dichotomy, it is not necessary to determine specific amplitudes and specific phases of the first channel input signal (reference signal) and the second channel input signal (phase shift signal). Knowing the phase difference of the first channel input signal and the second channel input signal in advance (the target phase value in step S102), comprehensively analyzing the first target signal and the plurality of second target signals in terms of phase, amplitude, direction and the like after obtaining the first target signal and the plurality of second target signals, and determining phase shift calibration information between the first channel and the second channel; the method provided by the embodiment of the specification is simple and efficient to operate.
By performing calibration in the embodiment of the present specification, the more the number of calibration times, the more accurate the phase shift calibration information is obtained. By the embodiment of the specification, the measured phase difference of two paths can be specified into one of four quadrants through twice calibration; eight calibrations are performed in total, so that the phase error of two channels can be controlled within 1.5 degrees. And traversing all channels to sequentially obtain phase differences between every two channels, and thus completing phase calibration of all channels of the antenna. The embodiment of the specification overcomes the defect of long time consumption of the prior calibration technology, and can control the measured phase error within 1.5 degrees through eight times of comparison, thereby greatly improving the measuring speed and efficiency of the phased array.
In one possible implementation, step S106 may include:
step S1061: respectively carrying out synthesis processing on the first target signal and a plurality of second target signals to obtain a plurality of synthesized signals;
step S1062: current phase shift calibration information between the first channel and the second channel is determined based on the plurality of composite signals.
In the embodiment of the present specification, the synthesis processing may synthesize according to the direction of the signal, the amplitude of the signal, and the phase of the signal; the first target signal and a second target signal can be combined to obtain a combined signal, and the second target signals correspond to the combined signals one by one; the phase-shifting calibration method can comprehensively analyze a plurality of synthesized signals in the aspects of phase, amplitude, direction and the like, obtain more accurate phase-shifting calibration information and improve calibration accuracy.
In one possible implementation, step S1062 may include:
step S10621: determining the amplitudes of the plurality of composite signals, respectively;
step S10622: current phase shift calibration information between the first channel and the second channel is determined based on the amplitudes of the plurality of composite signals.
In the embodiment of the present disclosure, the number of the synthesized signals may be three, the amplitudes of the three synthesized signals are compared, and the phase shift calibration information is determined according to the comparison result. According to the embodiment of the specification, the phase shift calibration information can be determined according to the amplitude of the synthesized signal, the direction of the synthesized signal is not required to be considered, more accurate phase shift calibration information can be obtained, and the calibration accuracy is improved.
In one possible implementation, after step S106, the method further includes:
step S108: determining the information type of the current phase shift calibration information;
step S109: under the condition that the information type is the interval type, determining the iterated times;
step S107 includes step S1071: and when the iterative times are smaller than the preset iterative times, taking the current phase shift calibration information as the current phase range information.
In the embodiment of the present specification, the information type includes a numeric value type and an interval type. The value type may be a specific phase difference value, and the interval type may be an interval in which the phase difference value is located. The number of iterations may indicate what number of calibrations are currently in.
In the embodiment of the present disclosure, if the information type of the phase shift calibration information is a section type, it indicates that the phase shift calibration information may be further accurate, the current phase range information may be updated, the current phase shift calibration information determined in step S106 may be used as the current phase range information, the target phase value may be further determined, and the calibration may be performed again. The preset iteration number may be determined according to the user input information, or the preset iteration number may be set to eight times. The larger the preset iteration number is, the more the calibration number is, and the more accurate the obtained phase shift calibration information is.
In the embodiment of the present disclosure, if the number of iterated times is smaller than the preset number of iterated times, it indicates that the preset iteration condition is not satisfied, and the process may return to step S102. If the number of iterations is not less than the preset number of iterations, the fact that the preset iteration conditions are met is indicated, the fact that the phase-shifting calibration information can reach the required accuracy is indicated, further calibration is not needed, calibration workload can be saved, and the current phase-shifting calibration information can be used as antenna calibration information. Further, two channels may be reselected as the first channel and the second channel among the plurality of channels of the antenna, and calibrated.
In one possible implementation, the plurality of target phase values includes a section left end point value, a section right end point value, and a section middle point value of the current phase range information.
In the embodiment of the present specification, the section left end point value and the section right end point value of the current phase range information may be determined based on the dichotomy; and determining the middle point value of the interval according to the left end point value and the right end point value of the interval. The section left end point value, the section right end point value, and the section middle point value of the current phase range information may be taken as target phase values.
In one possible implementation, after step S108, the method further includes:
Step S110: and under the condition that the information type is a numerical value type, determining that a preset iteration condition is met, and taking the current phase shift calibration information corresponding to the condition that the preset iteration condition is met as antenna calibration information.
In the embodiment of the present disclosure, if the information type of the phase shift calibration information is a numerical value type, the description cannot be further accurate, which indicates that a preset iteration condition is satisfied, and the current phase shift calibration information may be used as antenna calibration information. Further, two channels may be reselected as the first channel and the second channel among the plurality of channels of the antenna, and calibrated.
In one possible implementation, acquiring the first channel and the second channel of the antenna includes:
two adjacent channels are selected from the plurality of channels of the antenna as a first channel and a second channel.
In the embodiment of the present specification, the two channels may be adjacent channels. After the calibration of the currently determined adjacent channels is completed, other adjacent channels can be selected and calibrated, so that the phase difference between every two channels of the antenna can be subjected to ergodic calibration, the calibration times can be reduced, and the calibration efficiency is improved.
The embodiments of the present specification will be described below with reference to specific phase values.
Let the current phase range information be [0, 360], the preset number of iterations be 4.
In the first calibration, the current phase range information is phase-divided based on a dichotomy, and the determined target phase value comprises: 0 °, 360 ° and 180 °.
Let the reference signal be X (0), reduce the phase of reference signal X (0) by 0 DEG to obtain phase-shifted signal Y (0). The phase of the reference signal X (0) is reduced by +360 DEG to obtain a phase-shifting signal Y (-360), and the phase of the reference signal X (0) is reduced by +180 DEG to obtain a phase-shifting signal Y (-180). The phase-shifted signal Y (-180) is identical to the phase-shifted signal Y (+180), and the phase-shifted signal Y (+180) is used instead of the phase-shifted signal Y (-180) hereinafter.
The reference signal X (0) is input to the first channel, and the phase-shift signal Y (0) is input to the second channel, so as to obtain a composite signal P (0, 0). The reference signal X (0) is input to the first channel, and the phase-shifted signal Y (-360) is input to the second channel to obtain the composite signal P (0, -360). The reference signal X (0) is input to the first channel, and the phase-shifted signal Y (+180) is input to the second channel, resulting in the synthesized signal P (0, +180).
The magnitudes of the signal amplitudes of the composite signal P (0, 0), the composite signal P (0, -360), and the composite signal P (0, +180) are compared.
The composite signal P (0, 0) must be identical to the composite signal P (0, -360).
If P (0, +180) =p (0, 0), it indicates that the two channels are 90 degrees or minus 90 degrees out of phase, the phase shift calibration information is-90 ° or +90°, the phase shift calibration information is of digital type, and no further calibration is required.
If P (0, +180) < P (0, 0), it is indicated that the phase difference range of the two channels is in the first quadrant or the fourth quadrant, the phase shift calibration information is (-90 °, +90°), the phase shift calibration information is of interval type, the phase shift calibration can be further calibrated, and the iterated times are 1.
If P (0, +180) > P (0, 0), it is indicated that the phase difference range of the two channels is in the second quadrant or the third quadrant, the phase shift calibration information is (+ 90 degrees, +270 degrees), the phase shift calibration information is of interval type, the phase shift calibration can be further calibrated, and the iterated times are 1.
And determining actual phase shift calibration information according to the actual comparison result. Thus, the first calibration is completed.
In the second calibration, if the phase shift calibration information obtained in the first calibration is (+90°, +270°) for example, the current phase range information is (+90°, +270°), the current phase range information is phase-divided based on the dichotomy, and the determined target phase value includes: +90°, +180°, and +270°.
The phase of the reference signal X (0) is reduced by +90°, resulting in a phase-shifted signal Y (-90). The phase of the reference signal X (0) is reduced by +180°, resulting in a phase-shifted signal Y (-180). The reference signal X (0) is reduced by +270 DEG to obtain a phase-shifted signal Y (-270).
The reference signal X (0) is input to the first channel, and the phase-shifted signal Y (-90) is input to the second channel to obtain the composite signal P (0, -90). The reference signal X (0) is input to the first channel, and the phase-shifted signal Y (-180) is input to the second channel to obtain the composite signal P (0, -180). The reference signal X (0) is input to the first channel, and the phase-shifted signal Y (-270) is input to the second channel, resulting in the composite signal P (0, -270).
The magnitudes of the synthesized signal P (0, -90), the synthesized signal P (0, -180), and the synthesized signal P (0, -270) are compared.
If P (0, -90) =p (0, -270), and P (0, -180) is the largest term, it is indicated that the two channels are 180 degrees out of phase, the phase shift calibration information is of the digital type, and no further calibration is required.
If P (0-90) and P (0-180) are larger two terms, the phase difference range of the two paths is in the third quadrant, the phase shift calibration information is (+ 180 DEG, +270 DEG), the phase shift calibration information is of a section type, the phase shift calibration information can be further calibrated, and the iterated times are 2.
If P (0-270) and P (0-180) are larger two terms, the phase difference range of the two paths is in the second quadrant, the phase shift calibration information is (+ 90 degrees, +180 degrees), the phase shift calibration information is of a section type, the phase shift calibration information can be further calibrated, and the iterated times are 2.
And determining actual phase shift calibration information according to the actual comparison result. Thus, the second calibration is completed.
In the second calibration, if the phase shift calibration information obtained in the first calibration is (-90 °, +90°) for example, the current phase range information is (-90 °, +90°), the current phase range information is phase-divided based on the dichotomy, and the determined target phase value includes: -90 °,0 ° and +90°.
The reference signal X (0) is reduced by-90 ° phase, resulting in a phase-shifted signal Y (+90). The reference signal X (0) is reduced by 0 ° in phase to obtain a phase-shifted signal Y (0). The phase of the reference signal X (0) is reduced by +90°, resulting in a phase-shifted signal Y (-90).
The reference signal X (0) is input to the first channel, and the phase-shifted signal Y (+90) is input to the second channel, resulting in the synthesized signal P (0, +90). The reference signal X (0) is input to the first channel, and the phase-shift signal Y (0) is input to the second channel, so as to obtain a composite signal P (0, 0). The reference signal X (0) is input to the first channel, and the phase-shifted signal Y (-90) is input to the second channel to obtain the composite signal P (0, -90).
The magnitude of the signal amplitudes of the composite signal P (0, +90), the composite signal P (0, 0) and the composite signal P (0, -90) are compared.
If P (0, +90) =p (0, -90), and P (0, 0) is the largest term, it is indicated that the two channels are 0 degrees out of phase, the phase shift calibration information is of the digital type, and no further calibration is required.
If P (0, +90) and P (0, 0) are two larger terms, the phase difference range of the two paths is in the fourth quadrant, the phase shift calibration information is (-90 degrees, 0 degrees), the phase shift calibration information is of a section type, the phase shift calibration can be further calibrated, and the iterated times are 2.
If P (0, -90) and P (0, 0) are larger two terms, the phase difference range of the two paths is in the first quadrant, the phase shift calibration information is (0, +90 degrees), the phase shift calibration information is of a section type, the phase shift calibration can be further calibrated, and the iterated times are 2.
And determining actual phase shift calibration information according to the actual comparison result. Thus, the second calibration is completed.
In the third calibration, taking the phase shift calibration information obtained in the second calibration as (0 °, +90°) as an example, the current phase range information is (0 °, +90°), the current phase range information is divided in phase based on the dichotomy, and the determined target phase value includes: 0 °, +45°, and +90°.
The reference signal X (0) is reduced by 0 ° in phase to obtain a phase-shifted signal Y (0). The phase of the reference signal X (0) is reduced by +45°, resulting in a phase-shifted signal Y (-45). The phase of the reference signal X (0) is reduced by +90°, resulting in a phase-shifted signal Y (-90).
The reference signal X (0) is input to the first channel, and the phase-shift signal Y (0) is input to the second channel, so as to obtain a composite signal P (0, 0). The reference signal X (0) is input to the first channel, and the phase-shifted signal Y (-45) is input to the second channel to obtain the composite signal P (0, -45). The reference signal X (0) is input to the first channel, and the phase-shifted signal Y (-90) is input to the second channel to obtain the composite signal P (0, -90).
The magnitudes of the signal amplitudes of the composite signal P (0, 0), the composite signal P (0, -45) and the composite signal P (0, -90) are compared.
If P (0, 0) =p (0, -90), and P (0, -45) is the largest term, it is indicated that the two channels are 45 degrees out of phase, the phase shift calibration information is of the digital type, and no further calibration is required.
If P (0, 0) and P (0, -45) are two larger items, it can be explained that the phase shift calibration information is (0 °, +45°), the phase shift calibration information is of the interval type, and the number of iterations of the calibration is 3.
If P (0-45) and P (0-90) are larger two terms, the phase difference range of the two paths is in the first quadrant, the phase shift calibration information is (+ 45 degrees, +90 degrees), the phase shift calibration information is of a section type, the phase shift calibration can be further calibrated, and the iterated times are 3.
And determining actual phase shift calibration information according to the actual comparison result. Thus, the third calibration is completed.
In the fourth calibration, taking the phase shift calibration information obtained in the third calibration as an example, the current phase range information is (+45°, +90°), the current phase range information is divided into phases based on the dichotomy, and the determined target phase value includes: +45°, +67.5°, and +90°.
The phase of the reference signal X (0) is reduced by +45°, resulting in a phase-shifted signal Y (-45). The reference signal X (0) is reduced by +67.5 DEG phase, resulting in a phase shifted signal Y (-67.5). The phase of the reference signal X (0) is reduced by +90°, resulting in a phase-shifted signal Y (-90).
The reference signal X (0) is input to the first channel, and the phase-shifted signal Y (-45) is input to the second channel to obtain the composite signal P (0, -45). The reference signal X (0) is input to the first channel, and the phase-shifted signal Y (-67.5) is input to the second channel to obtain the composite signal P (0, -67.5). The reference signal X (0) is input to the first channel, and the phase-shifted signal Y (-90) is input to the second channel to obtain the composite signal P (0, -90).
The magnitudes of the signal amplitudes of the composite signal P (0, -45), the composite signal P (0, -67.5) and the composite signal P (0, -90) are compared.
If P (0, -45) =p (0, -90), and P (0, -67.5) is the largest term, it is indicated that the two paths are out of phase by 67.5 degrees, the phase shift calibration information is of the digital type, and no further calibration is required.
If P (0, -67.5) and P (0, -45) are two larger items, it can be explained that the phase shift calibration information is (+45°, +67.5°), the phase shift calibration information is of the interval type, it can be further calibrated, and the number of iterated times is 4.
If P (0, -67.5) and P (0, -90) are larger two terms, the phase difference range of the two paths is in the first quadrant, the phase shift calibration information is (+ 67.5 degrees, +90 degrees), the phase shift calibration information is of a section type, the phase shift calibration can be further calibrated, and the iterated times are 4.
And determining actual phase shift calibration information according to the actual comparison result. Thus, the fourth calibration is completed.
At this time, the number of iterations is 4, and the calibration accuracy is 22.5 degrees as same as the preset number of iterations, so as to meet the required calibration accuracy.
If the required calibration precision cannot be met by 4 times of calibration, the calibration steps can be continuously repeated by adopting the binary method thinking, and the intermediate value of the current phase range information is selected for multiple times and compared with the corresponding synthesized signal strength when the phase difference range is the maximum value and the minimum value, so that the specific phase difference value of the two paths of signals is judged.
By performing calibration in the embodiment of the present specification, the more the number of calibration times, the more accurate the phase shift calibration information is obtained. By the embodiment of the specification, only eight times of calibration are needed in total, so that the phase error of two channels can be controlled within 1.5 degrees. And traversing all channels to sequentially obtain phase differences between every two channels, and thus completing phase calibration of all channels of the antenna.
Referring to fig. 6, an antenna calibration device provided in an embodiment of the present disclosure includes:
an acquisition module 10, configured to acquire a reference signal, current phase range information, and a first channel and a second channel of an antenna;
a first determining module 20, configured to perform phase division processing on the current phase range information based on a dichotomy, and determine a plurality of target phase values;
a second determining module 30, configured to perform phase shifting processing on the reference signal according to the multiple target phase values, so as to obtain multiple phase-shifted signals;
the third determining module 40 is configured to input a reference signal to the first channel, perform a first phase shift process, and obtain a first target signal;
a fourth determining module 50, configured to input the plurality of phase-shifted signals to the second channel, and perform a second phase-shift process to obtain a plurality of second target signals;
A fifth determining module 60, configured to determine current phase shift calibration information between the first channel and the second channel according to the first target signal and the plurality of second target signals;
the triggering module 70 is configured to trigger the first determining module by using the current phase-shift calibration information as current phase range information when the preset iteration condition is not satisfied, until the preset iteration condition is satisfied, and use the current phase-shift calibration information corresponding to the case that the preset iteration condition is satisfied as antenna calibration information.
In the existing antenna array correction method, the amplitude and the phase of the signal received by each array element are required to be known, and the method and the equipment are complex and have low efficiency. While the present embodiment determines phase shift calibration information based on a dichotomy, it is not necessary to determine specific amplitudes and specific phases of the first channel input signal (reference signal) and the second channel input signal (phase shift signal). Knowing the phase difference of the first channel input signal and the second channel input signal in advance (the target phase value in step S102), comprehensively analyzing the first target signal and the plurality of second target signals in terms of phase, amplitude, direction and the like after obtaining the first target signal and the plurality of second target signals, and determining phase shift calibration information between the first channel and the second channel; the method provided by the embodiment of the specification is simple and efficient to operate.
By performing calibration in the embodiment of the present specification, the more the number of calibration times, the more accurate the phase shift calibration information is obtained. By the embodiment of the specification, the measured phase difference of two paths can be specified into one of four quadrants through twice calibration; eight calibrations are performed in total, so that the phase error of two channels can be controlled within 1.5 degrees. And traversing all channels to sequentially obtain phase differences between every two channels, and thus completing phase calibration of all channels of the antenna. The embodiment of the specification overcomes the defect of long time consumption of the prior calibration technology, and can control the measured phase error within 1.5 degrees through eight times of comparison, thereby greatly improving the measuring speed and efficiency of the phased array.
In one possible implementation, the fifth determining module includes:
the first determining unit is used for respectively synthesizing the first target signal and a plurality of second target signals to obtain a plurality of synthesized signals;
and a second determining unit for determining phase shift calibration information between the first channel and the second channel based on the plurality of synthesized signals.
In one possible implementation, the second determining unit includes:
a first determining subunit configured to determine amplitudes of the plurality of composite signals, respectively;
And a second determining subunit for determining phase shift calibration information between the first channel and the second channel according to the amplitudes of the plurality of synthesized signals.
In one possible implementation, after determining the current phase shift calibration information between the first channel and the second channel according to the first target signal and the plurality of second target signals, the apparatus further includes:
a sixth determining module, configured to determine an information type of the current phase shift calibration information;
a seventh determining module, configured to determine the iterated number of times when the information type is an interval type;
the triggering module 70 is configured to use the current phase shift calibration information as the current phase range information when the number of iterations is less than a preset number of iterations.
In one possible implementation, the plurality of target phase values includes a section left end point value, a section right end point value, and a section middle point value of the current phase range information.
In one possible implementation, the apparatus further includes:
and the eighth determining module is used for determining that the preset iteration condition is met under the condition that the information type is a numerical value type, and taking the current phase shift calibration information corresponding to the condition that the preset iteration condition is met as antenna calibration information.
In one possible implementation, the acquisition module 10 includes:
and a selection unit for selecting two adjacent channels from the plurality of channels of the antenna as a first channel and a second channel.
It should be noted that, in the apparatus provided in the foregoing embodiment, when implementing the functions thereof, only the division of the foregoing functional modules is used as an example, in practical application, the foregoing functional allocation may be implemented by different functional modules, that is, the internal structure of the device is divided into different functional modules, so as to implement all or part of the functions described above. In addition, the apparatus and the method embodiments provided in the foregoing embodiments belong to the same concept, and specific implementation processes of the apparatus and the method embodiments are detailed in the method embodiments and are not repeated herein.
Furthermore, embodiments of the present disclosure provide a non-transitory computer readable storage medium having stored thereon computer program instructions that, when executed by a processor, implement the above-described antenna calibration method.
The computer program product may include a computer readable storage medium having computer readable program instructions embodied thereon for causing a processor to implement aspects of the present application.
The computer readable storage medium may be a tangible device that can hold and store instructions for use by an instruction execution device. The computer readable storage medium may be, for example, but not limited to, an electronic storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium would include the following: portable computer disks, hard disks, random Access Memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static Random Access Memory (SRAM), portable compact disk read-only memory (CD-ROM), digital Versatile Disks (DVD), memory sticks, floppy disks, mechanical coding devices, punch cards or in-groove structures such as punch cards or grooves having instructions stored thereon, and any suitable combination of the foregoing. Computer-readable storage media, as used herein, are not to be construed as transitory signals per se, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmission media (e.g., optical pulses through fiber optic cables), or electrical signals transmitted through wires.
The computer readable program instructions described herein may be downloaded from a computer readable storage medium to a respective computing/processing device or to an external computer or external storage device over a network, such as the internet, a local area network, a wide area network, and/or a wireless network. The network may include copper transmission cables, fiber optic transmissions, wireless transmissions, routers, firewalls, switches, gateway computers and/or edge servers. The network interface card or network interface in each computing/processing device receives computer readable program instructions from the network and forwards the computer readable program instructions for storage in a computer readable storage medium in the respective computing/processing device.
Computer program instructions for performing the operations of the present application may be assembly instructions, instruction Set Architecture (ISA) instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source or object code written in any combination of one or more programming languages, including an object oriented programming language such as Smalltalk, c++ or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The computer readable program instructions may be executed entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computer (for example, through the Internet using an Internet service provider). In some embodiments, aspects of the present application are implemented by personalizing electronic circuitry, such as programmable logic circuitry, field Programmable Gate Arrays (FPGAs), or Programmable Logic Arrays (PLAs), with state information for computer readable program instructions, which may execute the computer readable program instructions.
Various aspects of the present application are described herein with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer-readable program instructions.
These computer readable program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks. These computer readable program instructions may also be stored in a computer readable storage medium that can direct a computer, programmable data processing apparatus, and/or other devices to function in a particular manner, such that the computer readable medium having the instructions stored therein includes an article of manufacture including instructions which implement the function/act specified in the flowchart and/or block diagram block or blocks.
The computer readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other devices to cause a series of operational steps to be performed on the computer, other programmable apparatus or other devices to produce a computer implemented process such that the instructions which execute on the computer, other programmable apparatus or other devices implement the functions/acts specified in the flowchart and/or block diagram block or blocks.
The flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of instructions, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
The embodiments of the present application have been described above, the foregoing description is exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the technical improvement of the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (8)
1. An antenna calibration method, comprising:
acquiring a reference signal, current phase range information and a first channel and a second channel of an antenna;
performing phase division processing on the current phase range information based on a dichotomy to determine a plurality of target phase values;
performing phase shifting processing on the reference signal according to a plurality of target phase values to obtain a plurality of phase-shifted signals;
inputting the reference signal into the first channel, and performing first phase shift processing to obtain a first target signal;
respectively inputting a plurality of phase-shifting signals into the second channel, and performing second phase-shifting processing to obtain a plurality of second target signals;
Determining current phase shift calibration information between the first channel and the second channel according to the first target signal and the plurality of second target signals;
when the preset iteration condition is not met, the current phase shift calibration information is used as current phase range information, the phase division processing is carried out on the current phase range information based on the dichotomy, and a plurality of target phase values are determined until the preset iteration condition is met, and the current phase shift calibration information corresponding to the preset iteration condition is used as antenna calibration information;
the determining phase shift calibration information between the first channel and the second channel according to the first target signal and the plurality of second target signals comprises:
synthesizing the first target signal and a plurality of second target signals respectively to obtain a plurality of synthesized signals;
determining said phase shift calibration information between said first channel and said second channel from a plurality of said composite signals.
2. The antenna calibration method of claim 1, wherein said determining said phase shift calibration information between said first channel and said second channel based on a plurality of said composite signals comprises:
Determining the amplitudes of a plurality of the composite signals, respectively;
determining said phase shift calibration information between said first channel and said second channel based on the magnitudes of a plurality of said composite signals.
3. The antenna calibration method of claim 1, wherein after determining current phase shift calibration information between the first channel and the second channel based on the first target signal and the plurality of second target signals, the method further comprises:
determining the information type of the current phase shift calibration information;
determining the iterated times under the condition that the information type is an interval type;
when the preset iteration condition is not satisfied, the step of using the current phase shift calibration information as the current phase range information includes: and when the iterated times are smaller than the preset iterated times, taking the current phase shift calibration information as the current phase range information.
4. The antenna calibration method of claim 3, wherein the plurality of target phase values includes a bin left end value, a bin right end value, and a bin mid-point value of the current phase range information.
5. The antenna calibration method according to claim 3 or 4, wherein after said determining the information type of the current phase shift calibration information, the method further comprises:
And under the condition that the information type is a numerical value type, determining that the preset iteration condition is met, and taking the current phase shift calibration information corresponding to the condition that the preset iteration condition is met as the antenna calibration information.
6. The antenna calibration method of claim 1, wherein acquiring the first channel and the second channel of the antenna comprises:
two adjacent channels are selected from the plurality of channels of the antenna as the first channel and the second channel.
7. An antenna calibration device, comprising:
the acquisition module is used for acquiring the reference signal, the current phase range information and the first channel and the second channel of the antenna;
the first determining module is used for carrying out phase division processing on the current phase range information based on a dichotomy and determining a plurality of target phase values;
the second determining module is used for carrying out phase shifting processing on the reference signal according to a plurality of target phase values to obtain a plurality of phase shifting signals;
the third determining module is used for inputting the reference signal into the first channel, and performing first phase shifting processing to obtain a first target signal;
a fourth determining module, configured to input a plurality of phase-shifted signals to the second channel, and perform a second phase-shift process to obtain a plurality of second target signals;
A fifth determining module, configured to determine current phase shift calibration information between the first channel and the second channel according to the first target signal and the plurality of second target signals;
the triggering module is used for triggering the first determining module by taking the current phase shift calibration information as the current phase range information when the preset iteration condition is not met until the preset iteration condition is met, and taking the current phase shift calibration information corresponding to the preset iteration condition as the antenna calibration information;
the fifth determination module includes:
the first determining unit is used for respectively synthesizing the first target signal and a plurality of second target signals to obtain a plurality of synthesized signals;
and a second determining unit configured to determine the phase shift calibration information between the first channel and the second channel based on a plurality of the synthesized signals.
8. A non-transitory computer readable storage medium having stored thereon computer program instructions, which when executed by a processor, implement the method of any of claims 1 to 6.
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