CN115754488A - 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, and determining a plurality of target phase values; performing phase shift processing on the reference signal according to the target phase values to obtain a plurality of phase shift signals; inputting the 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 to 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, taking the current phase shift calibration information as the current phase range information, and returning to the step of determining a plurality of target phase values. The invention greatly improves the phased array measurement speed and efficiency.
Description
Technical Field
The invention relates to the field of antenna test, in particular to an antenna calibration method, an antenna calibration device and a storage medium.
Background
A phased array antenna is an antenna system whose radiating part can be divided into a number of phase-controlled channel excitations. Generally, a phased array antenna mainly comprises an antenna array surface, a phase shifter, a feed network, a corresponding control circuit and the like. Because the phased array antenna system is complex, all levels of components are not perfectly connected, and certain nonlinear working characteristics exist among the components, amplitude and phase calibration or test must be carried out on each antenna port in order to ensure the stable performance of the phased array antenna within the range of the technical conditions during the working period of the phased array antenna.
In the existing antenna array correction method, most of the antenna array correction methods are based on digital beam forming antenna arrays, and the amplitude and the phase of signals received by each array element are required to be known. The near-field scanning correction method is complex in equipment and low in efficiency.
Disclosure of Invention
In view of this, the present application provides an antenna calibration method, an antenna calibration device, and a storage medium, which can at least solve the technical problem of low efficiency of the conventional 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, and determining a plurality of target phase values;
performing phase shift processing on the reference signal according to the target phase values to obtain a plurality of phase shift signals;
inputting the reference signal into the first channel, and performing first phase shift processing to obtain a first target signal;
respectively inputting the phase-shifted signals to the second channels, 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 a plurality of second target signals;
and when the preset iteration condition is not met, taking the current phase shift calibration information as the current phase range information, returning the step of performing phase division processing on the current phase range information based on the dichotomy, determining a plurality of target phase values until the preset iteration condition is met, and taking the corresponding current phase shift calibration information when the preset iteration condition is met as the antenna calibration information.
In a possible implementation manner, the determining phase shift calibration information between the first channel and the second channel according to the first target signal and a plurality of second target signals includes:
respectively synthesizing the first target signal and a plurality of second target signals to obtain a plurality of synthesized signals;
determining the phase shift calibration information between the first channel and the second channel based on a plurality of the composite signals.
In one possible implementation, the determining the phase shift calibration information between the first channel and the second channel according to the plurality of synthesized signals includes:
determining amplitudes of a plurality of the synthesized signals, respectively;
determining the phase shift calibration information between the first channel and the second channel based on the amplitudes of the plurality of synthesized signals.
In a possible implementation manner, after determining, according to the first target signal and a plurality of second target signals, current phase shift calibration information between the first channel and the second channel, the method further includes:
determining the information type of the current phase shift calibration information;
determining the number of times of iteration is performed under the condition that the information type is an interval type;
when the preset iteration condition is not met, the step of using the current phase shift calibration information as the current phase range information comprises the following steps: and when the iteration times are smaller than the preset iteration 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 an interval left end point value, an interval right end point value, and an interval midpoint value of the current phase range information.
In one possible implementation, after the determining the information type of the current dephasing 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 corresponding current phase-shifting calibration information when the preset iteration condition is met as the antenna calibration information.
In one possible implementation, obtaining the first channel and the second channel of the antenna includes:
selecting two adjacent channels from among a 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 apparatus includes:
the device comprises an acquisition module, a processing module and a processing module, wherein the acquisition module is used for acquiring a reference signal, current phase range information and a first channel and a second channel of an antenna;
the first determining module is used for performing 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 performing phase shifting processing on the reference signal according to the target phase values to obtain a plurality of phase-shifted signals;
a third determining module, configured to input the reference signal to the first channel, and perform a first phase shift process to obtain a first target signal;
a fourth determining module, configured to input the multiple phase-shifted signals to the second channel, and perform a second phase-shifting process to obtain multiple second target signals;
a fifth determining module, configured to determine, according to the first target signal and a plurality of second target signals, current phase shift calibration information between the first channel and the second channel;
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 corresponding current phase shift calibration information when the preset iteration condition is met as the antenna calibration information.
In one possible implementation manner, the fifth determining module includes:
a first determining unit, configured to perform synthesis processing on the first target signal and the plurality of second target signals, respectively, to obtain a plurality of synthesized signals;
a second determining unit for determining the phase shift calibration information between the first channel and the second channel according to 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 method described above.
The present invention determines the phase shift calibration information based on a dichotomy without determining the specific amplitudes and specific phases of the first channel input signal (reference signal) and the second channel input signal (phase shifted signal). Knowing the phase difference (target phase value) of the first channel input signal and the second channel input signal in advance, and performing comprehensive analysis on the first target signal and the plurality of second target signals after obtaining the first target signal and the plurality of second target signals, so that phase shift calibration information between the first channel and the second channel can be determined; the method provided by the invention is simple and efficient to operate, overcomes the defect of long time consumption of the existing calibration technology, and greatly improves the phased array measurement speed and efficiency.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a phased array antenna and a receiving antenna device.
Fig. 2 is a flowchart illustrating an antenna calibration method according to an exemplary embodiment.
Fig. 3 is a flowchart illustrating an antenna calibration method according to another exemplary embodiment.
Fig. 4 is a schematic flow chart illustrating a method for determining phase shift calibration information in an antenna calibration method according to yet another exemplary embodiment.
Fig. 5 is a flowchart illustrating an antenna calibration method according to yet another exemplary embodiment.
Fig. 6 is a block diagram illustrating an antenna calibration apparatus 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 can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
The word "exemplary" is used exclusively 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.
Furthermore, in the following detailed description, numerous specific details are set forth 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 that are well known to those skilled in the art have not been described in detail so as not to obscure the present application.
The invention provides an antenna calibration method, an antenna calibration device and a storage medium, and aims to improve the speed and efficiency of phased array antenna calibration.
With reference to fig. 1 to fig. 5, an antenna calibration method provided in an embodiment of the present disclosure includes:
step S101: a reference signal, current phase range information, and first and second channels of an antenna are obtained.
The embodiments of the present specification may be applied to a phased array antenna 200, and the phased array antenna 200 refers to an antenna that changes a pattern shape by controlling a feeding phase of a radiation element in an array antenna. The receiving antenna apparatus 300 may receive antenna signals from the phased array antenna 200, and the receiving antenna 301 apparatus 300 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 the channel, and corresponding phase-shift values of the plurality of channels 201 may be different. Two channels may be selected among the plurality of channels 201 as a first channel and a second channel, respectively.
In the embodiments 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 derived 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] at the time of the first calibration, and the difference range determined by the last calibration may be used as the current phase range information in the calibration process after the first calibration.
Step S102: and performing phase division processing on the current phase range information based on a dichotomy, and determining a plurality of target phase values.
The dichotomy is an efficient search algorithm based on mathematical principles, and can search specific elements in an ordered array. In this embodiment of the present specification, phase division processing may be performed on the current phase range information based on a dichotomy, and a plurality of target phase values may be determined through the phase division processing. The left end point, the right end point, and the middle point of the phase range information to be processed may be determined as target phase values.
Step S103: and performing phase shift processing on the reference signal according to the plurality of target phase values to obtain a plurality of phase shift signals.
In the embodiments of the present specification, the phase shift processing may refer to phase reduction processing. 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. A target phase value corresponds to a phase shifted signal. The phase differences between the plurality of phase-shifted signals and the reference signal are a plurality of target phase values obtained in step S102, respectively.
Step S104: and inputting the reference signal into a first channel, and performing first phase shift processing to obtain a first target signal.
In this embodiment, the reference signal may be used as an input signal of the first channel, the first channel may perform a first phase shift process on the reference signal to obtain a first target signal, and the spectrometer 302 may obtain related information (such as direction information, amplitude information, and phase information) of the first target signal.
Step S105: and respectively inputting the plurality of phase-shifted signals to a second channel for second phase-shifting processing to obtain a plurality of second target signals.
In this embodiment, the phase-shifted signal may be used as an input signal of a second channel, the second channel may perform second phase-shifting processing on the multiple phase-shifted signals, respectively, to obtain multiple second target signals, and related information (such as direction information, amplitude information, and phase information) of the second target signals may be obtained by the frequency 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, the phase shift calibration information may refer to a difference value between a phase shift value of the first channel and a phase shift value of the second channel or an interval in which the difference value is located. The phase shift calibration information may be determined by analyzing the first target signal and the plurality of second target signals by a signal analyzer in terms of phase, amplitude, direction, etc.
Step S107: and when the preset iteration condition is not met, taking the current phase shift calibration information as the current phase range information, returning to the step S102 until the preset iteration condition is met, and taking the corresponding current phase shift calibration information when the preset iteration condition is met as the antenna calibration information.
In this embodiment of the present description, the preset iteration condition may be that the number of iterations reaches the preset number of iterations, and the greater the number of iterations, the more accurate the phase shift calibration information is. When the preset iteration condition is not met, next calibration can be performed on the first channel and the second channel, the current phase-shifting calibration information is used as the current phase range information, the target phase value is determined based on the dichotomy again, and the phase-shifting calibration information is further accurately shifted. When the preset iteration condition is met, the current phase-shifting calibration information can be used as the antenna calibration information, and the antenna calibration information meets the calibration precision requirement.
In a possible implementation manner, after the preset iteration condition is satisfied and the antenna calibration information is obtained, two channels may be selected from the multiple channels 201 of the phased array antenna, and the two channels may be respectively used as the first channel and the second channel, 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 to be used 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 calibration of the channel B and the channel C is completed, the channel C and the channel D can be selected to be used 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; therefore, ergodic calibration can be carried out on every two channels in the phased array antenna, and antenna calibration information between every two channels in the phased array antenna is obtained.
In the existing antenna array correction method, the amplitude and the phase of a signal received by each array element are required to be known, and the method is complex in equipment and low in efficiency. While the embodiments of the present description determine the phase shift calibration information based on dichotomy, there is no need to determine specific amplitudes and specific phases of the first channel input signal (reference signal) and the second channel input signal (phase shifted signal). Knowing the phase difference between the first channel input signal and the second channel input signal in advance (the target phase value in step S102), obtaining a first target signal and a plurality of second target signals, and then performing comprehensive analysis on the first target signal and the plurality of second target signals in terms of phase, amplitude, direction and the like, so as to determine 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.
When the calibration is performed through the embodiments of the present specification, the more the calibration times are, the more accurate the obtained phase shift calibration information is. Through the embodiment of the specification, the measured phase difference of the two channels can be embodied into one of four quadrants through twice calibration; and a total of eight times of calibration is carried out, namely the phase error of the two channels can be controlled within 1.5 degrees. Traversing all the channels, and sequentially obtaining the phase difference between every two channels, so that the phase calibration of all the channels of the antenna can be completed. The embodiment of the specification overcomes the defect of long time consumption of the prior calibration technology, and the measured phase error can be controlled within 1.5 degrees by eight times of comparison, so that the measurement speed and efficiency of the phased array are greatly improved.
In one possible implementation, step S106 may include:
step S1061: respectively synthesizing 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 synthesizing process 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 synthesized to obtain a synthesized signal, and a plurality of second target signals correspond to a plurality of synthesized signals one by one; the method can comprehensively analyze a plurality of synthesized signals from the aspects of phase, amplitude, direction and the like, obtain more accurate phase-shifting calibration information and improve the calibration accuracy.
In one possible implementation, step S1062 may include:
step S10621: determining amplitudes of the plurality of synthesized 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 this embodiment, 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. In the embodiment of the present description, the phase shift calibration information may be determined according to the amplitude of the synthesized signal, and the direction of the synthesized signal does not need to be considered, so that more accurate phase shift calibration information may be obtained, and the calibration accuracy may be improved.
In a possible implementation manner, after step S106, the method further includes:
step S108: determining the information type of the current phase shift calibration information;
step S109: determining the number of times of iteration is performed under the condition that the information type is an interval type;
step S107 includes step S1071: and when the iteration times are less than the preset iteration 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 numerical 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 that the calibration is currently at the number of times.
In this embodiment of the present description, if the information type of the phase shift calibration information is an interval 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 calibration may be performed again. The preset iteration number may be determined according to user input information, or may be set to eight. The larger the preset iteration times are, the more the calibration times are, and the more accurate the obtained phase shift calibration information is.
In this embodiment of the present specification, if the number of iterations is less than the preset number of iterations, it indicates that the preset iteration condition is not satisfied, and the process may return to step S102. If the iteration times are not less than the preset iteration times, the preset iteration conditions are met, the phase-shifting calibration information can reach the required accuracy, further calibration is not needed, the calibration workload can be saved, and the current phase-shifting calibration information can be used as the 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 an interval left end point value, an interval right end point value, and an interval midpoint value of the current phase range information.
In this embodiment of the present specification, an interval left end point value and an interval right end point value of the current phase range information may be determined based on a dichotomy; and determining an interval midpoint value according to the interval left end point value and the interval right end point value. The interval left end point value, the interval right end point value, and the interval midpoint value of the current phase range information may be taken as the target phase value.
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 corresponding current phase-shifting calibration information when the preset iteration condition is met as antenna calibration information.
In the embodiment of the present description, if the information type of the phase shift calibration information is a numerical value type, it indicates that the phase shift calibration information cannot be further accurate, and indicates that a preset iteration condition is satisfied, and the current phase shift calibration information may be used as the 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, obtaining the first channel and the second channel of the antenna includes:
two adjacent channels are selected from among the plurality of channels of the antenna as a first channel and a second channel.
In the embodiments of the present specification, two channels may be adjacent channels. After the currently determined adjacent channel is calibrated, other adjacent channels can be selected and calibrated, so that the phase difference between every two channels of the antenna can be calibrated in a ergodic manner, the calibration times can be reduced, and the calibration efficiency is improved.
The following describes embodiments of the present specification with reference to specific phase values.
Assume that the current phase range information is [0, 360], and the preset number of iterations is 4.
In the first calibration, the current phase range information is subjected to phase division based on a dichotomy, and the determined target phase value comprises: 0 °, 360 ° and 180 °.
The reference signal is set as X (0), and the phase of the reference signal X (0) is reduced by 0 DEG to obtain a phase-shifted signal Y (0). The phase of the reference signal X (0) is reduced by +360 degrees to obtain a phase-shifted signal Y (-360), and the phase of the reference signal X (0) is reduced by +180 degrees to obtain a phase-shifted signal Y (-180). The phase-shifted signal Y (-180) is the same as 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-shifted signal Y (0) is input to the second channel, so that a synthesized signal P (0,0) is obtained. The reference signal X (0) is input to the first channel, and the phase-shifted signal Y (-360) is input to the second channel, resulting in 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 composite signal P (0, + 180).
The signal amplitude magnitudes of the synthesized signal P (0,0), the synthesized signal P (0, -360), and the synthesized signal P (0, + 180) are compared.
The synthesized signal P (0,0) is necessarily the same as the synthesized signal P (0, -360).
If P (0, + 180) = P (0,0), it means that the phases of the two channels are different by 90 degrees or minus 90 degrees, the phase shift calibration information is-90 degrees or +90 degrees, the phase shift calibration information is a numerical type, and no further calibration is needed.
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 an interval type, further calibration can be performed, and the number of iterations is 1.
If P (0, + 180) > P (0,0) indicates 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 °, +270 °), the phase shift calibration information is of an interval type, further calibration can be performed, and the number of iterations is 1.
And determining actual phase shift calibration information according to the actual comparison result. At this point, the first calibration is complete.
In the second calibration, if the phase shift calibration information obtained by the first calibration is (+ 90 °, +270 °), and the current phase range information is (+ 90 °, +270 °), the current phase range information is divided into phases based on dichotomy, and the determined target phase values include: +90 °, +180 °, and +270 °.
The phase of +90 DEG is reduced for the reference signal X (0), and a phase-shifted signal Y (-90) is obtained. The phase of +180 DEG is reduced for the reference signal X (0) to obtain a phase-shifted signal Y (-180). The phase of +270 DEG is reduced for the reference signal X (0) 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, resulting in 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, resulting in 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 signal amplitude magnitudes of the composite signal P (0, -90), the composite signal P (0, -180) and the composite signal P (0, -270) are compared.
If P (0, -90) = P (0, -270), and P (0, -180) is the largest term, indicating that the two channels are 180 degrees out of phase, the phase shift calibration information is of a numeric type and no further calibration is required.
If P (0, -90) and P (0, -180) are two relatively large terms, it is indicated that the phase difference range of the two channels is in the third quadrant, the phase shift calibration information is (+ 180, +270 °), the phase shift calibration information is of an interval type, further calibration can be performed, and the number of iterations is 2.
If P (0, -270) and P (0, -180) are two relatively large terms, it is indicated that the phase difference range of the two channels is in the second quadrant, the phase shift calibration information is (+ 90 degrees and +180 degrees), the phase shift calibration information is an interval type, further calibration can be performed, and the number of iterations is 2.
And determining actual phase shift calibration information according to the actual comparison result. At this point, the second calibration is complete.
In the second calibration, if the phase shift calibration information obtained by the first calibration is (-90 °, +90 °), for example, and the current phase range information is (-90 °, +90 °), the current phase range information is divided into phases based on dichotomy, and the determined target phase values include: -90 °,0 ° and +90 °.
The phase of-90 ° is reduced to the reference signal X (0), resulting in a phase-shifted signal Y (+ 90). The phase of the reference signal X (0) is reduced by 0 DEG to obtain a phase-shifted signal Y (0). The phase of +90 DEG is reduced for the reference signal X (0), and a phase-shifted signal Y (-90) is obtained.
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 composite signal P (0, + 90). The reference signal X (0) is input to the first channel, and the phase-shifted signal Y (0) is input to the second channel, so that a synthesized signal P (0,0) is obtained. 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 composite signal P (0, -90).
The signal amplitude magnitudes of the synthesized signal P (0, + 90), the synthesized signal P (0,0), and the synthesized signal P (0, -90) are compared.
If P (0, + 90) = P (0, -90), and P (0,0) is the largest entry, indicating that the two channels are out of phase by 0 degrees, the phase shift calibration information is of a numeric type and no further calibration is required.
If P (0, + 90) and P (0,0) are two relatively large terms, it is indicated that the phase difference range of the two channels is in the fourth quadrant, the phase shift calibration information is (-90 degrees and 0 degrees), the phase shift calibration information is an interval type, further calibration can be performed, and the number of iterations is 2.
If P (0, -90) and P (0,0) are two relatively large terms, it is indicated that the phase difference range of the two channels is in the first quadrant, the phase shift calibration information is (0, +90 °), the phase shift calibration information is an interval type, further calibration can be performed, and the number of iterations is 2.
And determining actual phase shift calibration information according to the actual comparison result. At this point, the second calibration is complete.
In the third calibration, taking the phase shift calibration information obtained by the second calibration as (0 °, +90 °), and the current phase range information as (0 °, +90 °), performing phase division on the current phase range information based on dichotomy, and determining the target phase value includes: 0, +45, and + 90.
The phase of the reference signal X (0) is reduced by 0 DEG to obtain a phase-shifted signal Y (0). The phase of +45 DEG is reduced for the reference signal X (0), and a phase-shifted signal Y (-45) is obtained. The phase of +90 DEG is reduced for the reference signal X (0), and a phase-shifted signal Y (-90) is obtained.
The reference signal X (0) is input to the first channel, and the phase-shifted signal Y (0) is input to the second channel, so that a synthesized signal P (0,0) is obtained. The reference signal X (0) is input to the first channel, and the phase-shifted signal Y (-45) is input to the second channel, resulting in 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, resulting in the composite signal P (0, -90).
The signal amplitude magnitudes of the synthesized signal P (0,0), the synthesized signal P (0, -45), and the synthesized signal P (0, -90) are compared.
If P (0,0) = P (0, -90) and P (0, -45) is the largest term, it means that the phases of the two channels are 45 degrees apart, and the phase shift calibration information is of a numerical type, and no further calibration is required.
If P (0,0) and P (0, -45) are two large terms, it can be said that the phase shift calibration information is (0 °, +45 °), the phase shift calibration information is of an interval type, and further calibration can be performed, and the number of iterations is 3.
If P (0, -45) and P (0, -90) are two relatively large terms, it is indicated that the phase difference range of the two channels is in the first quadrant, the phase shift calibration information is (+ 45 degrees and +90 degrees), the phase shift calibration information is an interval type, further calibration can be performed, and the number of iterations is 3.
And determining actual phase shift calibration information according to the actual comparison result. At this point, the third calibration is completed.
In the fourth calibration, taking the phase shift calibration information obtained by the third calibration as (+ 45 °, +90 °) as an example, and the current phase range information as (+ 45 °, +90 °), performing phase division on the current phase range information based on dichotomy, and determining the target phase value including: +45 °, +67.5 °, and +90 °.
The phase of +45 DEG is reduced for the reference signal X (0), and a phase-shifted signal Y (-45) is obtained. The phase of +67.5 DEG is reduced for the reference signal X (0), resulting in a phase-shifted signal Y (-67.5). The phase of +90 DEG is reduced for the reference signal X (0), and a phase-shifted signal Y (-90) is obtained.
The reference signal X (0) is input to the first channel, and the phase-shifted signal Y (-45) is input to the second channel, resulting in 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, resulting in 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, resulting in the composite signal P (0, -90).
The signal amplitude magnitudes 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 means that the phases of the two channels are 67.5 degrees apart, and the phase shift calibration information is of a numerical type, and no further calibration is required.
If P (0, -67.5) and P (0, -45) are two relatively large terms, it can be stated that the phase shift calibration information is (+ 45 °, +67.5 °), and the phase shift calibration information is of interval type, and can be further calibrated, and the number of iterations is 4.
If P (0, -67.5) and P (0, -90) are two relatively large terms, it is indicated that the phase difference range of the two channels is in the first quadrant, the phase shift calibration information is (+ 67.5 degrees and +90 degrees), the phase shift calibration information is an interval type, further calibration can be performed, and the number of iterations is 4.
And determining actual phase shift calibration information according to the actual comparison result. This time, the fourth calibration is complete.
The number of iterations is 4, the number of iterations is the same as the preset number of iterations, the calibration accuracy is 22.5 degrees, and the required calibration accuracy is met.
If the required calibration precision cannot be met by 4 times of calibration, the calibration steps can be continuously repeated by adopting dichotomy thinking, the middle value of the current phase range information is selected for multiple times to be compared with the corresponding synthesized signal strength when the phase difference range is the maximum value and the minimum value, and the specific phase difference value of the two paths of signals is judged.
When the calibration is performed through the embodiments of the present specification, the more the calibration times are, the more accurate the obtained phase shift calibration information is. Through the embodiment of the specification, the calibration is performed for eight times in total, and the phase error of the two channels can be controlled within 1.5 degrees. And traversing all the channels to sequentially obtain the phase difference between every two channels, so that the phase calibration of all the channels of the antenna can be completed.
Referring to fig. 6, an antenna calibration apparatus provided in an embodiment of the present specification includes:
an obtaining module 10, configured to obtain 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 bisection method, and determine a plurality of target phase values;
the second determining module 30 is configured to perform phase shift processing on the reference signal according to the multiple target phase values to obtain multiple phase-shifted signals;
the third determining module 40 is configured to input the reference signal to the first channel, and perform the first phase shift processing to obtain a first target signal;
a fourth determining module 50, configured to input the multiple phase-shifted signals to the second channel, and perform a second phase-shifting process to obtain multiple 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 the current phase range information when the preset iteration condition is not met, until the preset iteration condition is met, and using the corresponding current phase shift calibration information when the preset iteration condition is met as the antenna calibration information.
In the existing antenna array correction method, the amplitude and the phase of a signal received by each array element are required to be known, and the method is complex in equipment and low in efficiency. While the embodiments of the present description determine the phase shift calibration information based on dichotomy, there is no need to determine specific amplitudes and specific phases of the first channel input signal (reference signal) and the second channel input signal (phase shifted signal). Knowing the phase difference between the first channel input signal and the second channel input signal in advance (the target phase value in step S102), obtaining a first target signal and a plurality of second target signals, and then performing comprehensive analysis on the first target signal and the plurality of second target signals in terms of phase, amplitude, direction and the like, so as to determine 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.
When the calibration is performed through the embodiments of the present specification, the more the calibration times are, the more accurate the obtained phase shift calibration information is. Through the embodiment of the specification, the measured phase difference of the two channels can be embodied into one of four quadrants through twice calibration; and a total of eight times of calibration is carried out, namely the phase error of the two channels can be controlled within 1.5 degrees. And traversing all the channels to sequentially obtain the phase difference between every two channels, so that the phase calibration of all the channels of the antenna can be completed. The embodiment of the specification overcomes the defect of long time consumption of the prior calibration technology, and the measured phase error can be controlled within 1.5 degrees by eight times of comparison, so that the measurement speed and efficiency of the phased array are greatly improved.
In one possible implementation, the fifth determining module includes:
a first determining unit, configured to perform synthesis processing on the first target signal and the plurality of second target signals, respectively, to obtain a plurality of synthesized signals;
a second determining unit for determining phase shift calibration information between the first channel and the second channel according to the plurality of synthesized signals.
In one possible implementation manner, the second determining unit includes:
a first determining subunit for determining the amplitudes of the plurality of synthesized signals, respectively;
and a second determining subunit, configured to determine 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 manner, after determining the current dephasing 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 number of iterations 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 smaller than a preset number of iterations.
In one possible implementation, the plurality of target phase values includes an interval left end point value, an interval right end point value, and an interval midpoint 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 the numerical value type, and taking the corresponding current phase-shifting calibration information when the preset iteration condition is met as the antenna calibration information.
In one possible implementation, the obtaining module 10 includes:
and the selection unit is used for selecting two adjacent channels from the plurality of channels of the antenna as the first channel and the second channel.
It should be noted that, when the apparatus provided in the foregoing embodiment implements the functions thereof, only the division of the functional modules is illustrated, and in practical applications, the functions may be distributed by different functional modules according to needs, that is, the internal structure of the apparatus may be divided into different functional modules to implement all or part of the functions described above. In addition, the apparatus and method embodiments provided by the above embodiments belong to the same concept, and specific implementation processes thereof are described in the method embodiments for details, which are not described herein again.
Furthermore, embodiments of the present specification also provide a non-volatile computer-readable storage medium, on which computer program instructions are stored, and the computer program instructions, when executed by a processor, implement the above-mentioned 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 various aspects of the present application.
The computer readable storage medium may be a tangible device that can hold and store the instructions for use by the instruction execution device. The computer readable storage medium may be, for example, but not limited to, an electronic memory device, a magnetic memory device, an optical memory device, an electromagnetic memory device, a semiconductor memory 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: a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a Static Random Access Memory (SRAM), a portable compact disc read-only memory (CD-ROM), a Digital Versatile Disc (DVD), a memory stick, a floppy disk, a mechanical coding device, such as punch cards or in-groove projection structures having instructions stored thereon, and any suitable combination of the foregoing. Computer-readable storage media as used herein is not to be construed as transitory signals per se, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through a waveguide or other transmission medium (e.g., optical pulses through a fiber optic cable), or electrical signals transmitted through electrical 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 via 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 transmission, wireless transmission, routers, firewalls, switches, gateway computers and/or edge servers. The network adapter 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.
The computer program instructions for carrying out operations of the present application may be assembler instructions, instruction Set Architecture (ISA) instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source code 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 execute 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 type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made 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 an electronic circuit, such as a programmable logic circuit, a Field Programmable Gate Array (FPGA), or a Programmable Logic Array (PLA), with state information of computer-readable program instructions, which can 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 storing the instructions comprises 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 flowchart 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 that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
Having described embodiments of the present application, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terms used herein were chosen in order to best explain the principles of the embodiments, the practical application, or technical improvements to the techniques in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (10)
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, and determining a plurality of target phase values;
performing phase shift processing on the reference signal according to the target phase values to obtain a plurality of phase shift signals;
inputting the reference signal into the first channel, and performing first phase shift processing to obtain a first target signal;
respectively inputting the phase-shifted signals into the second channels, 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 a plurality of second target signals;
and when the preset iteration condition is not met, taking the current phase shift calibration information as the current phase range information, returning to the step of performing phase division processing on the current phase range information based on the dichotomy, determining a plurality of target phase values until the preset iteration condition is met, and taking the corresponding current phase shift calibration information when the preset iteration condition is met as the antenna calibration information.
2. The method of antenna calibration according to claim 1, wherein said determining phase shift calibration information between said first channel and said second channel based on said first target signal and a plurality of said second target signals comprises:
respectively synthesizing the first target signal and a plurality of second target signals to obtain a plurality of synthesized signals;
determining the phase shift calibration information between the first channel and the second channel based on a plurality of the composite signals.
3. The method of antenna calibration according to claim 2 wherein said determining said phasing calibration information between said first channel and said second channel based on a plurality of said composite signals comprises:
determining amplitudes of a plurality of the synthesized signals, respectively;
determining the phase shift calibration information between the first channel and the second channel based on the amplitudes of the plurality of synthesized signals.
4. The method of antenna calibration according to 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 a plurality of the second target signals, the method further comprises:
determining the information type of the current phase shift calibration information;
determining the number of times of iteration is performed under the condition that the information type is an interval type;
when the preset iteration condition is not met, the step of using the current phase shift calibration information as the current phase range information comprises the following steps: and when the iteration times are smaller than the preset iteration times, taking the current phase shift calibration information as the current phase range information.
5. The antenna calibration method of claim 4, wherein the plurality of target phase values includes an interval left end point value, an interval right end point value, and an interval midpoint value of the current phase range information.
6. The antenna calibration method of claim 4 or 5, 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 corresponding current phase-shifting calibration information when the preset iteration condition is met as the antenna calibration information.
7. The antenna calibration method of claim 1, wherein obtaining the first channel and the second channel of the antenna comprises:
selecting two adjacent channels from among the plurality of channels of the antenna as the first channel and the second channel.
8. An antenna calibration device, comprising:
the device comprises an acquisition module, a processing module and a processing module, wherein the acquisition module is used for acquiring a reference signal, current phase range information and a first channel and a second channel of an 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 performing phase shifting processing on the reference signal according to the target phase values to obtain a plurality of phase-shifted signals;
a third determining module, configured to input the reference signal to the first channel, and perform a first phase shift process to obtain a first target signal;
a fourth determining module, configured to input the multiple phase-shifted signals to the second channel, and perform a second phase-shifting process to obtain multiple second target signals;
a fifth determining module, configured to determine, according to the first target signal and a plurality of second target signals, current phase shift calibration information between the first channel and the second channel;
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 corresponding current phase shift calibration information when the preset iteration condition is met as the antenna calibration information.
9. The antenna calibration apparatus of claim 8, wherein the fifth determination module comprises:
a first determining unit, configured to perform synthesis processing on the first target signal and the plurality of second target signals, respectively, to obtain a plurality of synthesized signals;
a second determining unit for determining the phase shift calibration information between the first channel and the second channel according to a plurality of the synthesized signals.
10. A non-transitory computer readable storage medium having computer program instructions stored thereon, wherein the computer program instructions, when executed by a processor, implement the method of any of claims 1 to 7.
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