CN114062793B - Correction method, device, equipment and storage medium of array antenna system - Google Patents
Correction method, device, equipment and storage medium of array antenna system Download PDFInfo
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Abstract
The application relates to a correction method, a correction device, correction equipment and a storage medium of an array antenna system. The method comprises the following steps: correcting a reference loop in a first array surface through a plurality of frequency points to obtain a first inconsistency parameter of the reference loop at each frequency point; wherein a reference transmitting antenna and a reference receiving antenna in the first array form the reference loop through a coupling network, and the first inconsistency parameter is used for enabling the first array to have consistent amplitude and phase transfer functions among multiple frequency points; and under the plurality of frequency points, correcting the receiving antenna and the transmitting antenna of the array surface through the second array surface respectively. According to the method, the reference loop is introduced into the same array plane, so that the first array plane has consistent amplitude and phase transfer functions among a plurality of frequency points, and compared with the mode of an external reflector in the prior art, the method is convenient for engineering implementation, can realize real-time online calculation, greatly improves the correction efficiency of an array antenna, and reduces maintenance cost.
Description
Technical Field
The present disclosure relates to the field of antenna technologies, and in particular, to a method, an apparatus, a device, and a storage medium for calibrating an array antenna system.
Background
The array antenna can obtain very high array synthesis gain, and the system performance is greatly improved. Therefore, array antenna technology has been an important research direction in various fields such as communication, radar, millimeter wave imaging and the like.
The array antenna transmitting and receiving channels in the imaging system have consistent amplitude and phase characteristics at each working frequency point and consistent initial phases among all frequency points, which are preconditions for ensuring imaging quality of the imaging system. Therefore, how to accurately and efficiently calibrate an array antenna is a technical problem in the art.
Disclosure of Invention
Based on this, the application provides a correction method, a correction device and a correction storage medium of an array antenna system.
In a first aspect, an embodiment of the present application discloses a calibration method for an array antenna system, including:
correcting a reference loop in a first array surface through a plurality of frequency points to obtain a first inconsistency parameter of the reference loop at each frequency point; wherein a reference transmitting antenna and a reference receiving antenna in the first array form the reference loop through a coupling network, and the first inconsistency parameter is used for enabling the first array to have consistent amplitude and phase transfer functions among multiple frequency points;
Under the plurality of frequency points, correcting the receiving antenna and the transmitting antenna of the array surface through a second array surface respectively to obtain a second inconsistent parameter of the receiving channel of the first array surface at each frequency point and a third inconsistent parameter of the transmitting channel of the first array surface at each frequency point; the first array surface and the second array surface are two array surfaces which are identical in antenna arrangement and are oppositely placed, the second inconsistency parameter is used for enabling each receiving channel to have consistent amplitude and phase transfer functions, and the third inconsistency parameter is used for enabling each transmitting channel to have consistent amplitude and phase transfer functions.
In a second aspect, an embodiment of the present application discloses a calibration device of an array antenna system, including:
the loop correction module is used for correcting a reference loop in the first array through a plurality of frequency points to obtain a first inconsistency parameter of the reference loop at each frequency point; wherein a reference transmitting antenna and a reference receiving antenna in the first array form the reference loop through a coupling network, and the first inconsistency parameter is used for enabling the first array to have consistent amplitude and phase transfer functions among multiple frequency points;
The propagation correction module is used for respectively correcting the receiving antenna and the transmitting antenna of the array surface through a second array surface under the plurality of frequency points to obtain a second inconsistent parameter of the receiving channel of the first array surface at each frequency point and a third inconsistent parameter of the transmitting channel of the first array surface at each frequency point; the first array surface and the second array surface are two array surfaces which are identical in antenna arrangement and are oppositely placed, the second inconsistency parameter is used for enabling each receiving channel to have consistent amplitude and phase transfer functions, and the third inconsistency parameter is used for enabling each transmitting channel to have consistent amplitude and phase transfer functions.
In a third aspect, an embodiment of the present application discloses a computer device, including a memory and a processor, where the memory stores a computer program, and the processor implements the steps of the method for correcting an array antenna system provided in the first aspect of the embodiment of the present application when the computer program is executed.
In a fourth aspect, embodiments of the present application disclose a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method for calibrating an array antenna system provided in the first aspect of embodiments of the present application.
According to the technical scheme, the reference loop in the first array is corrected through the plurality of frequency points, so that first inconsistent parameters of the reference loop at all frequency points are obtained, and the receiving channel and the transmitting channel of the first array are corrected through the second array matched with the first array, so that second inconsistent parameters of the receiving channel of the first array at all frequency points and third inconsistent parameters of the transmitting channel of the first array at all frequency points are obtained. The method and the device have the advantages that the reference loop is introduced into the same array surface to achieve the fact that the first array surface has consistent amplitude and phase transfer functions among a plurality of frequency points, the transmission correction of the different array surface achieves the fact that each receiving channel and each transmitting channel of the first array surface have consistent amplitude and phase transfer functions among the frequency points, compared with the mode that an external reflector is used in the traditional technology, the method and the device are convenient to implement engineering, real-time online calculation is achieved, correction efficiency of an array antenna is greatly improved, and maintenance cost is reduced.
Drawings
Fig. 1 is a schematic flow chart of a calibration method of an array antenna system according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a first array of the present embodiments;
fig. 3 is another flow chart of a calibration method of an array antenna system according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a first embodiment of a receive channel calibration of a first array;
FIG. 5 is a schematic diagram of a principle of transmit channel correction for a first array surface provided in an embodiment of the present application;
fig. 6 is a schematic flow chart of a calibration method of an array antenna system according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of a calibration device of an array antenna system according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of a computer device according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions in the embodiments of the present application are further described in detail by the following embodiments with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
Fig. 1 is a flow chart of a calibration method of an array antenna system according to an embodiment of the present application. The embodiment of the application can be applied to the situation of correcting the array antenna, the method can be executed by the correction device of the array antenna system provided by the embodiment of the application, and the device can be realized in a software and/or hardware mode and can be generally integrated in computer equipment. Such as an array antenna correction application. As shown in fig. 1, the method may include:
S101, correcting a reference loop in a first array surface through a plurality of frequency points to obtain a first inconsistency parameter of the reference loop at each frequency point.
Wherein a reference transmit antenna and a reference receive antenna in the first array form the reference loop through a coupling network, the first inconsistency parameter being for causing the first array to have a consistent amplitude and phase transfer function between multiple frequency points.
In general, as shown in fig. 2, an array antenna system may include a plurality of antenna planes, a highly integrated FPGA, a signal processor, a display terminal, and the like. Each array plane may include a plurality of transmitting antennas and a plurality of receiving antennas, each transmitting antenna corresponding to a transmitting channel and each receiving antenna corresponding to a receiving channel. The time-sharing transmission of the transmitting antennas in the array plane can be controlled through the switch, and a plurality of receiving antennas receive simultaneously. The transmitting antenna and the receiving antenna can be in various antenna forms such as a horn antenna, a dielectric rod antenna, a microstrip antenna, a waveguide slot antenna and the like, and the beam width of the antenna can be selected based on actual requirements. The type, number, arrangement, antenna spacing and amplitude and phase distribution of current on the antennas in the array plane can determine the radiation characteristics of the array plane, and the radiation field of the array plane is the vector superposition of electromagnetic fields generated by the antennas in the array plane. The first plane may be the plane a or the plane B in fig. 2, that is, when the plane a in the array antenna system needs to be corrected, the first plane is the plane a, and when the plane B needs to be corrected, the first plane is the plane B.
And selecting one transmitting antenna from the first array as a reference transmitting antenna, selecting one receiving antenna as a reference receiving antenna, and connecting the reference transmitting antenna and the reference receiving antenna through a coupling network of a printed circuit board where the first array is positioned so as to form a reference loop. Since the wiring length and dielectric constant of the printed circuit board between the reference transmitting antenna and the reference receiving antenna in the reference loop are fixed, the problem of phase inconsistency of the first plane between the multiple frequency points can be corrected by disposing the reference loop in the same plane.
It should be noted that, the reference transmitting antenna and the reference receiving antenna may be antennas that participate in beam forming in the array plane, or may be other antennas that do not participate in beam forming, as long as the signal-to-noise ratio required for correction is satisfied, which is not limited in this embodiment. The embodiment of the application is described by taking an antenna participating in beam forming as a reference antenna.
The reference loop in the first array is enabled to work, the amplitude value and the phase value of the reference loop under each frequency point are collected, and the reference loop is corrected based on the collected amplitude value and the collected phase value, so that the reference loop has consistent amplitude and phase transfer functions among a plurality of frequency points. Thus, the first inconsistency parameter may comprise an amplitude correction factor and a phase correction factor of the reference loop.
In a specific embodiment, optionally, the process of S101 may be: controlling a reference transmitting antenna in the first array to transmit radio frequency signals of a plurality of frequency points to a reference receiving antenna; collecting measured values of received signals when the reference receiving antenna receives radio frequency signals; and determining a first inconsistency parameter of the reference loop at each frequency point according to each measured value. Alternatively, the inverse of each measurement value may be determined as the first inconsistency parameter of the reference loop at each frequency point.
The measured values may include, among other things, amplitude values and phase values of the received signal. And transmitting radio frequency signals of a plurality of frequency points to a reference receiving antenna by directly controlling a reference transmitting antenna in a reference loop, and acquiring a measured value array RSLOOP [ Ntone ] of received signals when the reference receiving antenna receives the radio frequency signals of the plurality of frequency points transmitted by the reference transmitting antenna. Wherein, ntone is the frequency point quantity that array antenna system work used. Next, the reciprocal 1/RSLOOP of each measured value in RSLOOP is determined as the first inconsistency parameter of the reference loop at each frequency point.
S102, under the plurality of frequency points, correcting the receiving antenna and the transmitting antenna of the array surface through a second array surface respectively to obtain a second inconsistent parameter of the receiving channel of the first array surface at each frequency point and a third inconsistent parameter of the transmitting channel of the first array surface at each frequency point.
The first array surface and the second array surface are two array surfaces which are identical in antenna arrangement and are oppositely placed, namely the two array surfaces are opposite and are aligned in edge, and the antenna positions in the array surfaces are in one-to-one correspondence. The first array surface and the second array surface have a certain distance therebetween, and in particular, the distance may be any size larger than the far field determination distance of the antenna. The second non-uniformity parameter is used to cause each receive channel to have a uniform amplitude and phase transfer function and the third non-uniformity parameter is used to cause each transmit channel to have a uniform amplitude and phase transfer function.
In practical applications, in order to improve the aggregate gain of the array antenna and ensure the imaging quality of the imaging system, it is also required that the transmitting and receiving channels of the array antenna have consistent amplitude and phase transfer functions at each frequency point. Therefore, the receiving antennas and the transmitting antennas of the first array surface can be corrected through the different array surface (namely the second array surface) of the first array surface, so that each receiving channel corresponding to each receiving antenna in the first array surface has a consistent amplitude and phase transfer function, and each transmitting channel corresponding to each transmitting antenna in the first array surface has a consistent amplitude and phase transfer function.
After the first inconsistency parameter, the second inconsistency parameter and the third inconsistency parameter are obtained, the first inconsistency parameter, the second inconsistency parameter and the third inconsistency parameter are used for compensating the first array, the new first inconsistency parameter, the new second inconsistency parameter and the new third inconsistency parameter of the first array are recalculated for the compensated first array according to the process described in the S101-S102, and if the new first inconsistency parameter, the new second inconsistency parameter and the new third inconsistency parameter are smaller than or equal to the corresponding preset threshold, it is indicated that the previously obtained first inconsistency parameter, the second inconsistency parameter and the third inconsistency parameter can compensate the phase difference of the reference loop of the array antenna (i.e. the first array) between multiple frequency points, the amplitude phase difference between each transmitting channel and the amplitude phase difference between each receiving channel. When the array antenna system is used for imaging, the first echo signal received by the first array surface can be corrected by adopting the first inconsistency parameter, the second inconsistency parameter and the third inconsistency parameter, namely, the first inconsistency parameter, the second inconsistency parameter and the third inconsistency parameter are multiplied with the first echo signal received by the first array surface to obtain a corrected first echo signal, so that focusing imaging of a target object is realized based on the corrected first echo signal. The first echo signal refers to a signal transmitted to the target object by the transmitting antenna in the first array surface, and the signal is reflected back to the receiving antenna in the first array surface by the target object.
By respectively introducing reference loops into the first array surface, amplitude correction and phase correction among the multiple frequency points are realized through the coupling loops of the same array surface, and the amplitude error and the phase error of the first array surface among the multiple frequency points are reduced.
According to the correction method of the array antenna system, the reference loop in the first array surface is corrected through the plurality of frequency points to obtain the first inconsistent parameters of the reference loop at all the frequency points, and the second inconsistent parameters of the receiving channel of the first array surface at all the frequency points and the third inconsistent parameters of the transmitting channel of the first array surface at all the frequency points are obtained through correcting the receiving channel and the transmitting channel of the first array surface through the second array matched with the first array surface. The method and the device have the advantages that the reference loop is introduced into the same array surface to achieve the fact that the first array surface has consistent amplitude and phase transfer functions among a plurality of frequency points, the transmission correction of the different array surface achieves the fact that each receiving channel and each transmitting channel of the first array surface have consistent amplitude and phase transfer functions among the frequency points, compared with the mode that an external reflector is used in the traditional technology, the method and the device are convenient to implement engineering, real-time online calculation is achieved, correction efficiency of an array antenna is greatly improved, and maintenance cost is reduced.
In one embodiment, a specific implementation of the receive channel correction and the transmit channel correction for the first array by the out-of-plane array of the first array is also provided. On the basis of the above embodiment, optionally, as shown in fig. 3, the method may include:
s301, correcting a reference loop in a first array surface through a plurality of frequency points to obtain a first inconsistency parameter of the reference loop at each frequency point.
S302, under a plurality of frequency points, determining any antenna in a second array surface as a transmitting beacon, taking the first array surface as a receiving array surface, and correcting the receiving antenna of the first array surface through the transmitting beacon to obtain a second inconsistency parameter of a receiving channel of the first array surface at each frequency point.
And the transmitting beacons of the second array surface are used for correcting each receiving antenna of the first array surface, namely, the transmitting correction of the different area array is used for enabling each receiving channel corresponding to each receiving antenna in the first array surface to have consistent amplitude and phase transfer functions.
As an alternative embodiment, optionally, as shown in fig. 4, the process of S302 may be:
The first array surface is used as a receiving array surface, and the transmitting beacon in the second array surface is controlled to transmit radio frequency signals of a plurality of frequency points to a non-reference receiving antenna and a reference receiving antenna in the first array surface;
collecting measured values of received signals when the reference receiving antenna and the non-reference receiving antenna receive radio frequency signals;
and determining a second inconsistency parameter of the receiving channel of the first array at each frequency point according to each measured value and a space transfer function between the space position of the transmitting beacon and the space position of each receiving antenna of the first array.
Wherein the measured values include an amplitude value and a phase value of the received signal. And switching the first array surface into a receiving array surface, namely, each receiving antenna in the first array surface is in a receiving state, and simultaneously controlling a different-plane array of the first array surface, namely, a transmitting beacon in the second array surface, to simultaneously transmit a plurality of frequency point radio frequency signals to each receiving antenna in the first array surface, so that a reference receiving antenna and a non-reference receiving antenna in the first array surface receive radio frequency signals transmitted by the transmitting beacon in the second array surface. And collecting a measured value array SST [ Ntone ] [ Ner ] of the received signals when each receiving antenna in the first array receives each radio frequency signal. Wherein, NTone is the frequency point number used by the operation of the array antenna system, and Ner is the number of receiving antennas in the first array.
Then, the measured array SST [ Ntone ] [ Ner ] is normalized according to a spatial transfer function H [ Ntone ] [ Ner ] between the spatial positions of the transmitted beacon and the spatial positions of the respective receiving antennas in the first array, to obtain a normalized array SST_std [ Ntone ] [ Ner ]. Further, each receiving antenna in the first array is corrected by taking the reference receiving antenna as a reference, so that the non-reference receiving antenna in the first array and the reference receiving antenna have consistent amplitude and phase transfer functions, and a second inconsistent parameter of the receiving channel of the first array at each frequency point is obtained. Wherein H [ Ntone ] [ Ner ] is a transfer function array calculated by a free space propagation model between the space position of the second array surface transmitting beacon and the space position of each receiving antenna of the first array surface.
Alternatively, the second inconsistency parameter ac_rx of the reception channels of the first array at each frequency point may be determined according to the following equation 1.
Equation 1: ac_rx=sst_std [ Ntone ] [ rxref ]/{ sst_std [ Ntone ] [ Ner ] };
wherein SST_std [ Ntone ] [ rxref ] is a measurement value corresponding to the reference receiving antenna in the first array surface after H [ Ntone ] [ Ner ] normalization.
S303, determining any antenna in the second array surface as a receiving beacon, taking the first array surface as a transmitting array surface, and correcting the transmitting antenna of the first array surface through the receiving beacon to obtain a third inconsistency parameter of the transmitting channel of the first array surface at each frequency point.
And the receiving beacons of the second array surface are used for correcting all the transmitting antennas of the first array surface, namely, the transmitting channels corresponding to all the transmitting antennas of the first array surface have consistent amplitude and phase transfer functions through propagation correction of the different area arrays.
As an alternative embodiment, optionally, as shown in fig. 5, the process of S303 may be:
the first array surface is used as a transmitting array surface, and a non-reference transmitting antenna and a reference transmitting antenna in the first array surface are controlled in a time-sharing mode to transmit radio frequency signals of a plurality of frequency points to a receiving beacon in the second array surface;
collecting measured values of received signals when the receiving beacons receive radio frequency signals of the non-reference transmitting antenna and the reference transmitting antenna;
and determining a third inconsistency parameter of the transmitting channel of the first array at each frequency point according to each measured value and a space transfer function between the space position of the receiving beacon and the space position of each transmitting antenna in the first array.
Wherein the measured values include an amplitude value and a phase value of the received signal. And switching the first array surface into a transmitting array surface, namely, the transmitting antennas in the first array surface are in a transmitting state, simultaneously controlling the operation of the different-plane arrays of the first array surface, namely, the receiving beacons in the second array surface, and time-sharing controlling the reference transmitting antennas and the non-reference transmitting antennas of the first array surface to transmit radio frequency signals of a plurality of frequency points to the receiving beacons in the second array surface, so that the receiving beacons in the second array surface time-sharing receive the radio frequency signals transmitted by the reference receiving antennas and the non-reference receiving antennas in the first array surface. And collecting a measured value array SSR [ Ntone ] [ Net ] of the received signals when the received beacons in the second array surface receive the radio frequency signals. Wherein, NTone is the frequency point number used by the operation of the array antenna system, and Net is the transmitting antenna number in the first array surface.
And then, normalizing the measured value array SSR [ Ntone ] [ Net ] according to a space transfer function H [ Ntone ] [ Net ] between the space position of the received beacon and the space positions of all the transmitting antennas in the first array, so as to obtain a normalized array SSR_std [ Ntone ] [ Net ]. Further, each transmitting antenna in the first array is corrected by taking the reference transmitting antenna as a reference, so that the non-reference transmitting antenna in the first array and the reference transmitting antenna have consistent amplitude and phase transfer functions, and a third inconsistent parameter of the transmitting channel of the first array at each frequency point is obtained. And the H [ Ntone ] [ Net ] is a transfer function calculated by a free space propagation model between the space position of the second array surface receiving beacon and the space position of different transmitting antennas of the first array surface.
Alternatively, a third inconsistency parameter ac_tx of the transmit channels of the first array at each frequency point may be determined according to the following equation 2.
Equation 2: ac_tx=ssr_std [ Ntone ] [ txref ]/{ ssr_std [ Ntone ] [ Net ] };
wherein SSR_std [ Ntone ] [ txref ] is a measured value corresponding to a reference transmitting antenna in the first array surface after H [ Ntone ] [ Net ] normalization.
S304, verifying whether the first inconsistency parameter, the second inconsistency parameter and the third inconsistency parameter are valid.
Specifically, the first, second and third inconsistency parameters may be used to compensate the first array, and the new first, second and third inconsistency parameters of the compensated first array are recalculated according to the process described in S301-S303, where if the new first, second and third inconsistency parameters are all less than or equal to the corresponding preset thresholds, it is indicated that the first, second and third inconsistency parameters obtained before can compensate the phase difference of the reference loop of the first array between multiple frequency points, the amplitude-phase difference between the transmitting channels and the amplitude-phase difference between the receiving channels, that is, the first, second and third inconsistency parameters obtained before are determined to be valid, and if the first array is corrected successfully, the correction mode is exited. If at least one of the new first inconsistency parameter, the new second inconsistency parameter and the new third inconsistency parameter is greater than the corresponding preset threshold, it indicates that the correction of the first array fails, and the reference loop, the receiving channel and the transmitting channel of the first array are corrected again with reference to the process of S301-S303.
In this embodiment, the propagation correction of the different area array may also be implemented, where the receiving channel in the first area array has a consistent amplitude and phase transfer function, and the transmitting channel in the first area array has a consistent amplitude and phase transfer function, so that no additional device is required, and the correction efficiency of the array antenna is improved.
For the understanding of those skilled in the art, assuming that the array antenna system includes two planes (i.e., the plane a and the plane B) with the same antenna arrangement and placed opposite to each other, the following describes a correction method of the array antenna system provided in the embodiment of the present application in the procedure shown in fig. 6, specifically, the method may include a propagation correction of a different plane and a coupling correction of the same plane, and may include the following steps:
s601, correcting a first reference loop in the array plane A through a plurality of frequency points to obtain an inconsistency parameter A1 of the first reference loop at each frequency point.
Wherein, a reference transmitting antenna and a reference receiving antenna in the array plane A form the first reference loop through a coupling network.
S602, correcting a second reference loop in the array plane B through a plurality of frequency points to obtain an inconsistency parameter B1 of the second reference loop at each frequency point.
Wherein a reference transmitting antenna and a reference receiving antenna in the array plane B form the second reference loop through a coupling network.
And S603, using the array plane A as a receiving array plane, and correcting a receiving antenna of the array plane A through a transmitting beacon in the array plane B to obtain an inconsistency parameter A2 of a receiving channel of the array plane A at each frequency point.
S604, using the array plane A as a transmitting array plane, and correcting a transmitting antenna of the array plane A through a receiving beacon in the array plane B to obtain an inconsistency parameter A3 of a transmitting channel of the array plane A at each frequency point.
S605, the array plane B is used as a receiving array plane, and the receiving antenna of the array plane B is corrected through the transmitting beacon in the array plane A, so that the inconsistency parameters B2 of the receiving channel of the array plane B at all frequency points are obtained.
S606, using the array plane B as a transmitting array plane, and correcting a transmitting antenna of the array plane B through a receiving beacon in the array plane A to obtain an inconsistency parameter B3 of a transmitting channel of the array plane B at each frequency point.
S607, correcting the first echo signals of all the frequency points acquired by the array plane A according to the inconsistency parameter A1, the inconsistency parameter A2 and the inconsistency parameter A3 during echo imaging.
And S608, correcting the second echo signals of all the frequency points acquired by the array surface B according to the inconsistency parameter B1, the inconsistency parameter B2 and the inconsistency parameter B3 during echo imaging.
It should be noted that the inconsistency parameters A1, A2, A3, B1, B2, and B3 may be obtained by referring to the calculation process of the first inconsistency parameter, the second inconsistency parameter, and the third inconsistency parameter described in the above embodiments, which are not described herein.
Fig. 7 is a schematic structural diagram of a calibration device of an array antenna system according to an embodiment of the present application. As shown in fig. 7, the apparatus may include: a loop correction module 701 and a propagation correction module 702.
Specifically, the loop correction module 701 is configured to correct a reference loop in the first array through a plurality of frequency points, so as to obtain a first inconsistency parameter of the reference loop at each frequency point; wherein a reference transmitting antenna and a reference receiving antenna in the first array form the reference loop through a coupling network, and the first inconsistency parameter is used for enabling the first array to have consistent amplitude and phase transfer functions among multiple frequency points;
The echo correction module 702 is configured to correct, under the plurality of frequency points, the receiving antenna and the transmitting antenna of the array through a second array surface, respectively, to obtain a second inconsistent parameter of the receiving channel of the first array at each frequency point and a third inconsistent parameter of the transmitting channel of the first array at each frequency point; the first array surface and the second array surface are two array surfaces which are identical in antenna arrangement and are oppositely placed, the second inconsistency parameter is used for enabling each receiving channel to have consistent amplitude and phase transfer functions, and the third inconsistency parameter is used for enabling each transmitting channel to have consistent amplitude and phase transfer functions.
According to the correction device of the array antenna system, the reference loop in the first array surface is corrected through the plurality of frequency points, so that the first inconsistent parameters of the reference loop at all the frequency points are obtained, the receiving channel and the transmitting channel of the first array surface are corrected through the second array matched with the first array surface, and the second inconsistent parameters of the receiving channel of the first array surface at all the frequency points and the third inconsistent parameters of the transmitting channel of the first array surface at all the frequency points are obtained. The method and the device have the advantages that the reference loop is introduced into the same array surface to achieve the fact that the first array surface has consistent amplitude and phase transfer functions among a plurality of frequency points, the transmission correction of the different array surface achieves the fact that each receiving channel and each transmitting channel of the first array surface have consistent amplitude and phase transfer functions among the frequency points, compared with the mode that an external reflector is used in the traditional technology, the method and the device are convenient to implement engineering, real-time online calculation is achieved, correction efficiency of an array antenna is greatly improved, and maintenance cost is reduced.
Based on the above embodiment, the loop correction module 701 may optionally include: the device comprises a control unit, an acquisition unit and a determination unit.
Specifically, the control unit is used for controlling the reference transmitting antenna in the first array surface to transmit radio frequency signals of a plurality of frequency points to the reference receiving antenna;
the acquisition unit is used for acquiring measured values of received signals when the reference receiving antenna receives each radio frequency signal;
the determining unit is used for determining a first inconsistency parameter of the reference loop at each frequency point according to each measured value.
On the basis of the above embodiment, optionally, the determining unit is specifically configured to determine the reciprocal of each measured value as the first inconsistency parameter of the reference loop at each frequency point.
Alternatively, the propagation correction module 702 may include a reception correction unit and a transmission correction unit on the basis of the above-described embodiments.
Specifically, the receiving correction unit is configured to determine that any antenna in the second array plane is a transmitting beacon, take the first array plane as a receiving array plane, correct a receiving antenna of the first array plane through the transmitting beacon, and obtain a second inconsistent parameter of a receiving channel of the first array plane at each frequency point;
The transmitting correction unit is used for determining any antenna in the second array surface as a receiving beacon, taking the first array surface as a transmitting array surface, correcting the transmitting antenna of the first array surface through the receiving beacon, and obtaining a third inconsistency parameter of the transmitting channel of the first array surface at each frequency point.
On the basis of the foregoing embodiment, optionally, the reception correction unit is specifically configured to take the first array plane as a reception array plane, and control the transmission beacon to transmit radio frequency signals of multiple frequency points to a non-reference reception antenna and a reference reception antenna in the first array plane; collecting measured values of received signals when the reference receiving antenna and the non-reference receiving antenna receive radio frequency signals; and determining a second inconsistency parameter of the receiving channel of the first array surface at each frequency point according to each measured value and a space transfer function between the space position of the transmitting beacon and the space position of each receiving antenna in the first array surface by taking the reference receiving antenna as a reference.
On the basis of the foregoing embodiment, optionally, the transmission correction unit is specifically configured to time-division control, with the first array surface being a transmission array surface, a non-reference transmission antenna and a reference transmission antenna in the first array surface to transmit radio frequency signals of multiple frequency points to the receiving beacon; collecting measured values of received signals when the receiving beacons receive radio frequency signals of the non-reference transmitting antenna and the reference transmitting antenna; and determining a third inconsistency parameter of the transmitting channel of the first array surface at each frequency point according to each measured value and a space transfer function between the space position of the receiving beacon and the space position of each transmitting antenna in the first array surface by taking the reference transmitting antenna as a reference.
On the basis of the above embodiment, optionally, the apparatus further includes: and an echo correction module.
Specifically, the echo correction module is configured to correct echo signals of each frequency point acquired by the array antenna system according to the first inconsistency parameter, the second inconsistency parameter, and the third inconsistency parameter.
In one embodiment, a computer device is provided, the block diagram of which may be as shown in FIG. 8. The computer device includes a processor, a memory, a network interface, and a database connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The database of the computer device is used to store data during calibration of the array antenna system. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a method of calibrating an array antenna system.
It will be appreciated by those skilled in the art that the structure shown in fig. 8 is merely a block diagram of some of the structures associated with the present application and is not limiting of the computer device to which the present application may be applied, and that a particular computer device may include more or fewer components than shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a computer device is provided comprising a memory and a processor, the memory having stored therein a computer program, the processor when executing the computer program performing the steps of:
correcting a reference loop in a first array surface through a plurality of frequency points to obtain a first inconsistency parameter of the reference loop at each frequency point; wherein a reference transmitting antenna and a reference receiving antenna in the first array form the reference loop through a coupling network, and the first inconsistency parameter is used for enabling the first array to have consistent amplitude and phase transfer functions among multiple frequency points;
under the plurality of frequency points, correcting the receiving antenna and the transmitting antenna of the array surface through a second array surface respectively to obtain a second inconsistent parameter of the receiving channel of the first array surface at each frequency point and a third inconsistent parameter of the transmitting channel of the first array surface at each frequency point; the first array surface and the second array surface are two array surfaces which are identical in antenna arrangement and are oppositely placed, the second inconsistency parameter is used for enabling each receiving channel to have consistent amplitude and phase transfer functions, and the third inconsistency parameter is used for enabling each transmitting channel to have consistent amplitude and phase transfer functions.
In one embodiment, the processor when executing the computer program further performs the steps of: controlling a reference transmitting antenna in the first array to transmit radio frequency signals of a plurality of frequency points to a reference receiving antenna; collecting measured values of received signals when the reference receiving antenna receives radio frequency signals; and determining a first inconsistency parameter of the reference loop at each frequency point according to each measured value.
In one embodiment, the processor when executing the computer program further performs the steps of: and determining the reciprocal of each measured value as a first inconsistency parameter of the reference loop at each frequency point.
In one embodiment, the processor when executing the computer program further performs the steps of: determining any antenna in a second array plane as a transmitting beacon, taking the first array plane as a receiving array plane, and correcting the receiving antenna of the first array plane through the transmitting beacon to obtain a second inconsistent parameter of a receiving channel of the first array plane at each frequency point; and determining any antenna in the second array surface as a receiving beacon, taking the first array surface as a transmitting array surface, and correcting the transmitting antenna of the first array surface through the receiving beacon to obtain a third inconsistency parameter of the transmitting channel of the first array surface at each frequency point.
In one embodiment, the processor when executing the computer program further performs the steps of: the first array surface is used as a receiving array surface, and the transmitting beacon is controlled to transmit radio frequency signals of a plurality of frequency points to a non-reference receiving antenna and a reference receiving antenna in the first array surface; collecting measured values of received signals when the reference receiving antenna and the non-reference receiving antenna receive radio frequency signals; and determining a second inconsistency parameter of the receiving channel of the first array surface at each frequency point according to each measured value and a space transfer function between the space position of the transmitting beacon and the space position of each receiving antenna in the first array surface by taking the reference receiving antenna as a reference.
In one embodiment, the processor when executing the computer program further performs the steps of: the first array surface is used as a transmitting array surface, and a non-reference transmitting antenna and a reference transmitting antenna in the first array surface are controlled in a time-sharing mode to transmit radio frequency signals of a plurality of frequency points to the receiving beacon; collecting measured values of received signals when the receiving beacons receive radio frequency signals of the non-reference transmitting antenna and the reference transmitting antenna; and determining a third inconsistency parameter of the transmitting channel of the first array surface at each frequency point according to each measured value and a space transfer function between the space position of the receiving beacon and the space position of each transmitting antenna in the first array surface by taking the reference transmitting antenna as a reference.
In one embodiment, the processor when executing the computer program further performs the steps of: and correcting echo signals of all frequency points acquired by the array antenna system according to the first inconsistency parameter, the second inconsistency parameter and the third inconsistency parameter.
In one embodiment, a computer readable storage medium is provided having a computer program stored thereon, which when executed by a processor, performs the steps of:
correcting a reference loop in a first array surface through a plurality of frequency points to obtain a first inconsistency parameter of the reference loop at each frequency point; wherein a reference transmitting antenna and a reference receiving antenna in the first array form the reference loop through a coupling network, and the first inconsistency parameter is used for enabling the first array to have consistent amplitude and phase transfer functions among multiple frequency points;
under the plurality of frequency points, correcting the receiving antenna and the transmitting antenna of the array surface through a second array surface respectively to obtain a second inconsistent parameter of the receiving channel of the first array surface at each frequency point and a third inconsistent parameter of the transmitting channel of the first array surface at each frequency point; the first array surface and the second array surface are two array surfaces which are identical in antenna arrangement and are oppositely placed, the second inconsistency parameter is used for enabling each receiving channel to have consistent amplitude and phase transfer functions, and the third inconsistency parameter is used for enabling each transmitting channel to have consistent amplitude and phase transfer functions.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the various embodiments provided herein may include non-volatile and/or volatile memory. The nonvolatile memory can include Read Only Memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), memory bus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), among others.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the present application. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.
Claims (6)
1. A method for calibrating an array antenna system, comprising:
correcting a reference loop in a first array surface through a plurality of frequency points to obtain a first inconsistency parameter of the reference loop at each frequency point; wherein a reference transmitting antenna and a reference receiving antenna in the first array form the reference loop through a coupling network, and the first inconsistency parameter is used for enabling the first array to have consistent amplitude and phase transfer functions among multiple frequency points;
Under the plurality of frequency points, correcting the receiving antenna and the transmitting antenna of the first array through a second array surface respectively to obtain a second inconsistent parameter of the receiving channel of the first array surface at each frequency point and a third inconsistent parameter of the transmitting channel of the first array surface at each frequency point; the first array surface and the second array surface are two array surfaces which are identical in antenna arrangement and are oppositely placed, the second inconsistency parameter is used for enabling each receiving channel to have consistent amplitude and phase transfer functions, and the third inconsistency parameter is used for enabling each transmitting channel to have consistent amplitude and phase transfer functions;
the correcting the reference loop in the first array through a plurality of frequency points to obtain a first inconsistency parameter of the reference loop at each frequency point comprises the following steps:
controlling a reference transmitting antenna in the first array to transmit radio frequency signals of a plurality of frequency points to a reference receiving antenna;
collecting measured values of received signals when the reference receiving antenna receives radio frequency signals;
determining a first inconsistency parameter of the reference loop at each frequency point according to each measured value;
correcting the receiving antenna of the array through the second array to obtain a second inconsistent parameter of the receiving channel of the first array at each frequency point, including:
The first array surface is used as a receiving array surface, and a transmitting beacon is controlled to transmit radio frequency signals of a plurality of frequency points to a non-reference receiving antenna and a reference receiving antenna in the first array surface;
collecting measured values of received signals when the reference receiving antenna and the non-reference receiving antenna receive radio frequency signals;
determining a second inconsistency parameter of a receiving channel of the first array surface at each frequency point according to each measured value and a space transfer function between the space position of the transmitting beacon and the space position of each receiving antenna of the first array surface by taking the reference receiving antenna as a reference;
the correcting, by the second array surface, the transmitting antennas of the array surface respectively, to obtain a third inconsistency parameter of the transmitting channel of the first array surface at each frequency point, including:
the first array surface is used as a transmitting array surface, and a non-reference transmitting antenna and a reference transmitting antenna in the first array surface are controlled in a time-sharing mode to transmit radio frequency signals of a plurality of frequency points to a receiving beacon;
collecting measured values of received signals when the receiving beacons receive radio frequency signals of the non-reference transmitting antenna and the reference transmitting antenna;
and determining a third inconsistency parameter of the transmitting channel of the first array surface at each frequency point according to each measured value and a space transfer function between the space position of the receiving beacon and the space position of each transmitting antenna in the first array surface by taking the reference transmitting antenna as a reference.
2. The method of claim 1, wherein determining the first inconsistency parameter for the reference loop at each frequency point based on each measurement comprises:
and determining the reciprocal of each measured value as a first inconsistency parameter of the reference loop at each frequency point.
3. The method according to claim 1 or 2, further comprising:
and correcting echo signals of all frequency points acquired by the array antenna system according to the first inconsistency parameter, the second inconsistency parameter and the third inconsistency parameter.
4. A calibration device for an array antenna system, comprising:
the loop correction module is used for correcting a reference loop in the first array through a plurality of frequency points to obtain a first inconsistency parameter of the reference loop at each frequency point; wherein a reference transmitting antenna and a reference receiving antenna in the first array form the reference loop through a coupling network, and the first inconsistency parameter is used for enabling the first array to have consistent amplitude and phase transfer functions among multiple frequency points;
the propagation correction module is used for respectively correcting the receiving antenna and the transmitting antenna of the first array through the second array surface under the plurality of frequency points to obtain a second inconsistent parameter of the receiving channel of the first array surface at each frequency point and a third inconsistent parameter of the transmitting channel of the first array surface at each frequency point; the first array surface and the second array surface are two array surfaces which are identical in antenna arrangement and are oppositely placed, the second inconsistency parameter is used for enabling each receiving channel to have consistent amplitude and phase transfer functions, and the third inconsistency parameter is used for enabling each transmitting channel to have consistent amplitude and phase transfer functions;
Wherein, the loop correction module includes:
the control unit is used for controlling the reference transmitting antenna in the first array surface to transmit radio frequency signals of a plurality of frequency points to the reference receiving antenna;
the acquisition unit is used for acquiring measured values of received signals when the reference receiving antenna receives each radio frequency signal;
the determining unit is used for determining a first inconsistency parameter of the reference loop at each frequency point according to each measured value;
the propagation correction module includes:
the receiving correction unit is used for taking the first array surface as a receiving array surface and controlling the transmitting beacon to transmit radio frequency signals of a plurality of frequency points to the non-reference receiving antenna and the reference receiving antenna in the first array surface; collecting measured values of received signals when the reference receiving antenna and the non-reference receiving antenna receive radio frequency signals; determining a second inconsistency parameter of a receiving channel of the first array surface at each frequency point according to each measured value and a space transfer function between the space position of the transmitting beacon and the space position of each receiving antenna of the first array surface by taking the reference receiving antenna as a reference;
the transmitting correction unit is used for taking the first array surface as a transmitting array surface and controlling the non-reference transmitting antenna and the reference transmitting antenna in the first array surface to transmit radio frequency signals of a plurality of frequency points to a receiving beacon in a time-sharing manner; collecting measured values of received signals when the receiving beacons receive radio frequency signals of the non-reference transmitting antenna and the reference transmitting antenna; and determining a third inconsistency parameter of the transmitting channel of the first array surface at each frequency point according to each measured value and a space transfer function between the space position of the receiving beacon and the space position of each transmitting antenna in the first array surface by taking the reference transmitting antenna as a reference.
5. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any of claims 1 to 3 when the computer program is executed.
6. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 3.
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