CN116203324A - MIMO array near-field measurement system and method - Google Patents
MIMO array near-field measurement system and method Download PDFInfo
- Publication number
- CN116203324A CN116203324A CN202310040773.1A CN202310040773A CN116203324A CN 116203324 A CN116203324 A CN 116203324A CN 202310040773 A CN202310040773 A CN 202310040773A CN 116203324 A CN116203324 A CN 116203324A
- Authority
- CN
- China
- Prior art keywords
- measurement
- array
- antenna array
- receiving
- antenna
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/10—Radiation diagrams of antennas
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
The invention relates to the technical field of near field measurement of electromagnetic scattering characteristics of targets, in particular to a MIMO array near field measurement system and a method, wherein the system comprises radio frequency transceiver equipment, an upper computer, an antenna array and two corresponding microwave switch matrixes; the antenna array at least comprises a row of antenna array elements; the microwave switch arrays comprise a plurality of receiving and transmitting control switches; each antenna array element in the antenna array is connected with a transmitting link through a receiving and transmitting control switch in one microwave switch matrix, and is connected with a receiving link through a receiving and transmitting control switch in the other microwave switch matrix; the upper computer is connected with the radio frequency receiving and transmitting equipment and the microwave switch array and is used for setting working parameters of the radio frequency receiving and transmitting equipment and on-off states of receiving and transmitting control switches in the microwave switch array according to the input setting instruction. The invention can flexibly configure the receiving and transmitting antennas according to the needs, reduces the number of the needed antennas and increases the aperture utilization ratio through antenna receiving and transmitting multiplexing.
Description
Technical Field
The embodiment of the invention relates to the technical field of near-field measurement of electromagnetic scattering characteristics of targets, in particular to a MIMO array near-field measurement system and method.
Background
The high-resolution radar imaging technology is widely applied to the field of target electromagnetic scattering property measurement, and is a powerful tool for diagnosing and analyzing a complex target scattering mechanism. How to utilize a measuring system to conveniently and rapidly carry out measurement on a target and obtain imaging measurement results has important research significance.
The near field measurement of the electromagnetic scattering characteristic of the target can be realized by utilizing the MIMO array, but the MIMO array is fixed, if different imaging measurement is required, different antenna arrays are needed, the number of the needed antennas is large, the aperture utilization rate is small, and the flexibility is poor.
Disclosure of Invention
Based on the problem of poor flexibility of the MIMO array near field measurement system, the embodiment of the invention provides the MIMO array near field measurement system and the method, which can adjust the functions of each antenna array element according to the needs in the measurement process, flexibly configure the receiving and transmitting antennas and realize the receiving and transmitting multiplexing of the antenna array elements.
In a first aspect, an embodiment of the present invention provides a MIMO array near field measurement system, including:
the system comprises radio frequency transceiver equipment, an upper computer, an antenna array and two corresponding microwave switch matrixes;
the antenna array at least comprises a row of antenna array elements;
the microwave switch array comprises a plurality of receiving and transmitting control switches, and the isolation degree of each receiving and transmitting control switch is not less than 80dB;
each antenna array element in the antenna array is connected with a transmitting link of the radio frequency transceiver through a corresponding receiving and transmitting control switch in one microwave switch matrix, and is connected with a receiving link of the radio frequency transceiver through a corresponding receiving and transmitting control switch in the other microwave switch matrix;
the radio frequency transceiver is used for generating and receiving a broadband sweep frequency signal;
the upper computer is connected with the radio frequency transceiver and the microwave switch array and is used for setting working parameters of the radio frequency transceiver and on-off states of the transceiver control switches in the microwave switch array according to the input setting instruction.
Optionally, the antenna array includes two rows of antenna elements; and the two rows of antenna array elements are arranged in a transverse dislocation way.
Optionally, the antenna array includes a plurality of rows of antenna elements, forming a two-dimensional array.
Optionally, the MIMO array near field measurement system further includes:
and the antenna bracket is used for arranging the antenna array so that the center of the antenna array is opposite to the geometric center of the target.
Optionally, the MIMO array near field measurement system further includes:
the rotating mechanism is arranged on the antenna bracket and used for driving the antenna array to rotate.
In a second aspect, an embodiment of the present invention further provides a MIMO array near field measurement method, implemented using the MIMO array near field measurement system as set forth in any one of the preceding claims, including the following steps:
acquiring measurement parameters;
determining a measurement strategy of the antenna array based on the measurement parameters;
according to the measurement strategy, setting working parameters of the radio frequency transceiver by the upper computer, and initializing the on-off state of each transceiver control switch in the microwave switch array;
calibrating the MIMO array near-field measurement system;
setting the on-off state of each receiving and transmitting control switch in the microwave switch array according to the measurement strategy, and measuring a target to obtain corresponding measurement data;
based on the acquired measurement data, imaging processing is performed.
Optionally, before the imaging processing based on the acquired measurement data, the method further includes the following steps:
changing the measurement strategy of the antenna array;
and returning to the step of setting working parameters of the radio frequency transceiver through the upper computer according to the measurement strategy, and initializing the on-off state of each transceiver control switch in the microwave switch array to obtain measurement data corresponding to the changed measurement strategy.
Optionally, the setting the on-off state of each transceiver control switch in the microwave switch array according to the measurement policy, and measuring the target to obtain corresponding measurement data includes the following steps:
according to the measurement strategy, performing single-channel measurement on a target through the MIMO array near-field measurement system to obtain corresponding measurement data;
and judging whether the measurement of all the channels is finished, if so, ending, otherwise, repeating the previous step.
Optionally, calibrating the MIMO array near field measurement system includes the following steps:
preheating the MIMO array near field measurement system, wherein the preheating time is not less than 30 minutes;
placing a calibration ball for calibration in front of the center of the antenna array, wherein the height of the calibration ball is consistent with that of the antenna array, and the measurement distance is as follows:
wherein c is the speed of light, L is the array length, B is the measurement bandwidth, and lambda is the wavelength corresponding to the measurement center frequency point.
The embodiment of the invention provides a MIMO array near-field measurement system and a method, which adopt an antenna array and two corresponding microwave switch matrixes to realize antenna receiving and transmitting multiplexing, and a receiving and transmitting control switch with high isolation is used for controlling each antenna array element to be connected into a transmitting link or a receiving link, so that the receiving and transmitting antennas are flexibly configured according to different imaging strategies, and the number of antennas required by near-field measurement of target electromagnetic scattering characteristics is reduced
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a MIMO array near field measurement system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an antenna array element arrangement according to an embodiment of the present invention;
fig. 3 is a schematic diagram of steps of a MIMO array near-field measurement method according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a two-dimensional BP imaging geometry.
In the figure: 100: a radio frequency transceiver device; 101: an upper computer; 102: an antenna array; 103: an antenna support; 200: an antenna element.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments, and all other embodiments obtained by those skilled in the art without making any inventive effort based on the embodiments of the present invention are within the scope of protection of the present invention.
As described above, near-field measurement of the electromagnetic scattering property of the target can be achieved by using the MIMO array, but the MIMO array is fixed in form, and if different imaging measurements are to be performed, different antenna arrays are required, so that the flexibility is poor, the number of required antennas is large, and the aperture utilization rate is small. In view of this, the present invention provides a MIMO array near field measurement system and method in which each antenna element can be used as both a transmitting antenna and a receiving antenna.
Specific implementations of the above concepts are described below.
Referring to fig. 1, an embodiment of the present invention provides a MIMO array near field measurement system, which includes: the radio frequency transceiver 100, the host computer 101, an antenna array 102, and two corresponding microwave switch matrices (two microwave switch matrices are not shown in fig. 1 for convenience of illustration); the antenna array 102 at least comprises a row of antenna array elements 200, wherein the row of antenna array elements 200 is a plurality of antenna array elements 200 which are transversely arranged, and the specific number of the antenna array elements 200 can be set according to the requirement; the microwave switch arrays comprise a plurality of receiving and transmitting control switches, and the isolation degree of each receiving and transmitting control switch is not less than 80dB in order to avoid interference in consideration of the multiplexing effect of receiving and transmitting antennas; the number of the transceiver control switches included in each microwave switch array is preferably equal to the number of antenna array elements included in the antenna array;
each antenna array element 200 in the antenna array 102 is connected to the transmitting link of the radio frequency transceiver 100 through the transceiver control switch corresponding to the antenna array element 200 in one of the microwave switch matrices, and is connected to the receiving link of the radio frequency transceiver 100 through the transceiver control switch corresponding to the antenna array element 200 in the other of the microwave switch matrices; that is, each antenna element 200 may be connected to a transmitting link to serve as a transmitting antenna element, or may be connected to a receiving link to serve as a receiving antenna element;
the radio frequency transceiver 100 is configured to generate and receive a broadband sweep signal; the rf transceiver 100 may include a radar transmitter, a radar receiver, a power amplifier, a low noise amplifier, etc., and may be in the prior art, and details thereof are not described herein;
the upper computer 101 is connected to the rf transceiver 100 and the two microwave switch arrays, and is configured to set, according to an input setting instruction, an operating parameter of the rf transceiver 100 and an on-off state of each of the transceiver control switches in the two microwave switch arrays.
The MIMO array near field measurement system provided by the invention adopts two sets of relatively independent and high-isolation switch arrays to respectively connect each antenna array element 200 and the radio frequency transceiver 100, and when in use, the on-off state of each transceiver control switch can be flexibly set according to a setting instruction input by a user, so that different transceiver antenna array elements are selected to measure a target, that is, in the measuring process of different measuring channels, the antenna array elements 200 can be used as transmitting antennas and receiving antennas, and the number of required antennas is reduced, the aperture utilization rate is increased, and the flexibility of the MIMO array near field measurement system is improved.
Optionally, as shown in fig. 2, the antenna array 102 includes two rows of antenna elements 200; the two rows of antenna array elements 200 are arranged in a transversely staggered manner. The numbers 1 to 17 above the antenna array elements 200 shown in fig. 2 are numbers for distinguishing the antenna array elements, the antenna array elements with the numbers 1, 3 and 5 … form one row, the antenna array elements with the numbers 2, 4 and 6 … form another row, and the two rows of antenna array elements are arranged in a staggered manner or staggered up and down, so that the size of the mountable position of the antenna array can be increased, leakage during measurement of the HH polarization of the antenna can be reduced, and imaging quality can be improved.
Further, the antenna array 102 includes a plurality of rows of antenna elements 200, which form a two-dimensional array, and the three-dimensional imaging measurement can be performed on the target through MIMO of the two-dimensional array.
Optionally, the MIMO array near-field measurement system further includes an antenna support 103, where the antenna support 103 is configured to set the antenna array 102 such that a center of the antenna array 102 is opposite to a geometric center of the target, so as to measure the target.
Further, the MIMO array near field measurement system further includes a rotation mechanism, where the rotation mechanism is disposed on the antenna support 103 and is configured to drive the antenna array 102 to rotate.
With the above embodiment, the antenna array 102 can be conveniently adjusted to achieve near field diagnostic imaging measurement of a target.
As shown in fig. 3, the present invention further provides a MIMO array near field measurement method, which is implemented by using the MIMO array near field measurement system according to any one of the embodiments, and specifically includes the following steps:
the measurement parameters may include the distance between the target and the antenna array, the accuracy of near field measurements, etc.;
the measurement strategy can comprise the connection relation between each antenna array element and a receiving link and a transmitting link in the measurement process;
the on-off state of each receiving-transmitting control switch in the microwave switch array is controlled, so that a corresponding antenna array element can be flexibly selected as a transmitting antenna array element or a receiving antenna array element, and the on-off state of each receiving-transmitting control switch in the microwave switch array is initialized, so that a transmitting antenna array element and a receiving antenna array element combination for calibration and first measurement can be obtained;
the calibration can be performed by using standard calibration bodies, such as calibration balls and the like;
the measurement data comprise echo data under a corresponding measurement strategy;
in step 310, an imaging process is performed based on the acquired measurement data.
By adopting the embodiment, each antenna array element can be flexibly configured as a transmitting antenna array element or a receiving antenna array element according to actually required measurement parameters so as to adapt to different measurement requirements.
Further, before step 310, the method further includes the following steps:
changing the measurement strategy of the antenna array;
returning to step 304 to obtain measurement data corresponding to the changed measurement strategy.
Further, the above steps may be repeated a plurality of times before step 310.
Before the final imaging process is performed in step 310, the measurement strategy of the antenna array is changed, and the method returns to step 304 to obtain echo data under other measurement strategies, so that, when the final imaging process is performed in step 310, an imaging result can be obtained based on the comprehensive processing (such as superposition, etc.) of the echo data under at least two different measurement strategies. By adopting the embodiment, the final imaging result can synthesize echo data corresponding to two or more measurement strategies, which is beneficial to eliminating the measurement error in a single mode and obtaining more target information. In addition, the method is realized by adopting the MIMO array near-field measurement system, the receiving and transmitting antennas can be rapidly switched and different measurement strategies can be adjusted according to actual needs, the antenna array or the position of the target and the antenna array does not need to be replaced, measurement errors caused by more operations are avoided, and more accurate imaging results are facilitated.
Optionally, step 302 "determining a measurement strategy of the antenna array based on the measurement parameters" further comprises:
based on the maximum allowed transmit-receive antenna element spacing in the measurement parameters, different measurement strategies are determined, such as:
(1) If the maximum allowed interval of the receiving antenna elements in the measurement parameters is 2 times of the interval of the antenna elements, the number of the antenna elements is shown in fig. 2, the measurement flow of the measurement strategy can be 1 sending and 2 receiving (i.e. the antenna element with the number of 1 is used as the transmitting antenna element, the antenna element with the number of 2 is used as the receiving antenna element), 1 sending and 3 receiving, 2 sending and 4 receiving, and so on; 1-shot 2-shot, 1-shot 3-shot, 3-shot 2-shot, 3-shot 4-shot, 3-shot 5-shot, 4-shot 2-shot, and the like can also be used;
(2) If the maximum allowed receiving-transmitting antenna array element interval in the measurement parameters is 4 times of the antenna array element interval, the measurement flow can be 1-transmitting and 2-receiving, 1-out 3-out, 1-out 5-out, 2-out 3-out, 2-out 5-out, 3-out 6-out, 3-out 7-out, and so on.
The measurement strategy is only an example of a part of possible measurement strategies, when the allowed maximum transmit-receive antenna array element interval is 3 times of the antenna array element interval, compared with the (1), the number of antenna array elements only bearing the receiving function can be further increased, in addition, the transmit-receive sequence of the measurement flow in the (2) is adjusted, and the number of antenna array elements only bearing the receiving function can be increased on the basis of reducing the transmit-receive array elements.
The transmission and receiving links of the antenna array elements can be further simplified by increasing the maximum allowable interval of the receiving and transmitting antenna array elements in the measurement parameters, but the imaging result can be greatly different from the imaging result of single-station measurement although the imaging result can still be obtained due to the increase of the double-station angles of the receiving and transmitting antenna array elements, the difference is also different due to the difference of scattering mechanisms, particularly the difference of multiple scattering measurement imaging results, so that the specific measurement parameters are required to be different according to the measurement targets, and the maximum interval of the receiving and transmitting antenna array elements is reasonably selected and is not limited further.
Optionally, step 306 "calibrating the MIMO array near field measurement system" further includes the steps of:
preheating the MIMO array near field measurement system, wherein the preheating time is not less than 30 minutes;
placing a calibration ball for calibration in front of the center of the antenna array, wherein the height of the calibration ball is consistent with that of the antenna array, and the measurement distance from the center of the antenna array is as follows:
wherein c is the speed of light, L is the array length, B is the measurement bandwidth, and lambda is the wavelength corresponding to the measurement center frequency point.
Optionally, in step 308, "according to the measurement policy, the on-off state of each transceiver control switch in the microwave switch array is set, and the target is measured, so as to obtain corresponding measurement data", and further includes the following steps:
according to the measurement strategy, performing single-channel measurement on a target through the MIMO array near-field measurement system to obtain corresponding measurement data;
and judging whether the measurement of all channels is finished, if yes, ending, otherwise, repeating the previous step, namely repeatedly carrying out single-channel measurement on the target through the MIMO array near-field measurement system according to the measurement strategy, and obtaining corresponding measurement data.
According to the embodiment, the measurement data of all channels specified by the measurement strategy are obtained by adopting a single-channel multi-round measurement mode, the required supporting facilities are simpler, the antenna array elements utilized in the single-channel measurement can be reused, namely, 1-transmission and 2-reception (namely, the antenna array element with the number of 1 is used as a transmitting antenna array element and the antenna array element with the number of 2 is used as a receiving antenna array element) are adopted in the previous round of single-channel measurement, 1-transmission and 3-reception can be still adopted in the single-channel measurement of the round, the antenna array element with the number of 1 is reused, and the on-off state of each receiving and transmitting control switch in the microwave switch array can be realized without other adjustment. And the duration of the measurement process can be regulated and controlled as required.
Optionally, step 310 "perform imaging processing based on the acquired measurement data", specifically, the following manner may be adopted:
as shown in fig. 4, for the near field measurement imaging situation based on the MIMO system, an imaging model is constructed, the antenna array coordinate is set as u, the target coordinate system is set as (x, y), and the distance from the antenna array to the reference center of the target coordinate system is set as R 0 . In the case of multiple scattering centers, the received echoes can be expressed as:
wherein s (f, u) represents target echo data received under the conditions of the current observation frequency f, the current transmitting antenna array element and the receiving antenna array element position u; Γ (x, y) represents the target scattering distribution function of the single scattering center in the target coordinate system; l represents the distance in the exponential term, describing the integral path of the imaging measurement of the scattering center for the phase delay of the corresponding single scattering center from the reference center.
As shown in fig. 4, the calculation formula of L is:
wherein R is b To integrate path change of standard volume during calibration, u t For transmitting the position of the antenna array element u r For the location of the receive antenna elements, (x) b ，y b ) Is the position of the calibration body in the target coordinate system.
During measurement, the array length and the measurement bandwidth cannot be wirelessly large, u max To u min For a limited measuring area, k max To k min For the frequency range of the corresponding radar. The imaging calculation formula is obtained by inverse Fourier transform and splitting the internal integration and the external integration:
wherein, the liquid crystal display device comprises a liquid crystal display device,
is an estimate of the target scatter distribution function Γ (x, y).
In summary, the embodiments of the present invention have at least the following beneficial effects:
1. in one embodiment of the invention, a near field measurement system of a MIMO array is provided, and an antenna array and two corresponding microwave switch matrixes are adopted, so that the on-off state of each receiving and transmitting control switch in the microwave switch array can be flexibly adjusted according to the need, and the multiplexing of receiving and transmitting antennas is realized;
2. in one embodiment of the invention, a near-field measurement method of a MIMO array is provided, by adopting the system, the multiplexing of receiving and transmitting antennas can be realized, multichannel echo data can be obtained without adjusting an antenna array, and the accuracy and the speed of imaging can be regulated and controlled;
3. in one embodiment of the invention, a near-field measurement method for a MIMO array is provided, and by adopting the system, echo data under different measurement strategies can be synthesized, so that errors of measurement under a single mode can be eliminated, and more target information can be obtained.
It is noted that relational terms such as first and second, and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Those of ordinary skill in the art will appreciate that: all or part of the steps for implementing the above method embodiments may be implemented by hardware related to program instructions, and the foregoing program may be stored in a computer readable storage medium, where the program, when executed, performs steps including the above method embodiments; and the aforementioned storage medium includes: various media in which program code may be stored, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. A MIMO array near field measurement system, comprising:
the system comprises radio frequency transceiver equipment, an upper computer, an antenna array and two corresponding microwave switch matrixes;
the antenna array at least comprises a row of antenna array elements;
the microwave switch array comprises a plurality of receiving and transmitting control switches, and the isolation degree of each receiving and transmitting control switch is not less than 80dB;
each antenna array element in the antenna array is connected with a transmitting link of the radio frequency transceiver through a corresponding receiving and transmitting control switch in one microwave switch matrix, and is connected with a receiving link of the radio frequency transceiver through a corresponding receiving and transmitting control switch in the other microwave switch matrix;
the radio frequency transceiver is used for generating and receiving a broadband sweep frequency signal;
the upper computer is connected with the radio frequency transceiver and the microwave switch array and is used for setting working parameters of the radio frequency transceiver and on-off states of the transceiver control switches in the microwave switch array according to the input setting instruction.
2. The system of claim 1, wherein the system further comprises a controller configured to control the controller,
the antenna array comprises two rows of antenna array elements; and the two rows of antenna array elements are arranged in a transverse dislocation way.
3. The system of claim 1, wherein the system further comprises a controller configured to control the controller,
the antenna array comprises a plurality of rows of antenna array elements to form a two-dimensional array.
4. The system of claim 1, further comprising:
and the antenna bracket is used for arranging the antenna array so that the center of the antenna array is opposite to the geometric center of the target.
5. The system of claim 4, further comprising:
the rotating mechanism is arranged on the antenna bracket and used for driving the antenna array to rotate.
6. A MIMO array near field measurement method, implemented by using the MIMO array near field measurement system according to any one of claims 1 to 5, comprising the steps of:
acquiring measurement parameters;
determining a measurement strategy of the antenna array based on the measurement parameters;
according to the measurement strategy, setting working parameters of the radio frequency transceiver by the upper computer, and initializing the on-off state of each transceiver control switch in the microwave switch array;
calibrating the MIMO array near-field measurement system;
setting the on-off state of each receiving and transmitting control switch in the microwave switch array according to the measurement strategy, and measuring a target to obtain corresponding measurement data;
based on the acquired measurement data, imaging processing is performed.
7. The method of claim 6, wherein the step of providing the first layer comprises,
before the imaging processing is performed based on the acquired measurement data, the method further comprises the following steps:
changing the measurement strategy of the antenna array;
and returning to the step of setting working parameters of the radio frequency transceiver through the upper computer according to the measurement strategy, and initializing the on-off state of each transceiver control switch in the microwave switch array to obtain measurement data corresponding to the changed measurement strategy.
8. The method of claim 6, wherein the step of providing the first layer comprises,
the method comprises the steps of setting the on-off state of each receiving and transmitting control switch in the microwave switch array according to the measurement strategy, measuring a target, and obtaining corresponding measurement data, and comprises the following steps:
according to the measurement strategy, performing single-channel measurement on a target through the MIMO array near-field measurement system to obtain corresponding measurement data;
and judging whether the measurement of all the channels is finished, if so, ending, otherwise, repeating the previous step.
9. The method of claim 6, wherein the step of providing the first layer comprises,
calibrating the MIMO array near-field measurement system, comprising the following steps:
preheating the MIMO array near field measurement system, wherein the preheating time is not less than 30 minutes;
placing a calibration ball for calibration in front of the center of the antenna array, wherein the height of the calibration ball is consistent with that of the antenna array, and the measurement distance is as follows:
wherein c is the speed of light, L is the array length, B is the measurement bandwidth, and lambda is the wavelength corresponding to the measurement center frequency point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310040773.1A CN116203324A (en) | 2023-01-11 | 2023-01-11 | MIMO array near-field measurement system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310040773.1A CN116203324A (en) | 2023-01-11 | 2023-01-11 | MIMO array near-field measurement system and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116203324A true CN116203324A (en) | 2023-06-02 |
Family
ID=86518382
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310040773.1A Pending CN116203324A (en) | 2023-01-11 | 2023-01-11 | MIMO array near-field measurement system and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116203324A (en) |
-
2023
- 2023-01-11 CN CN202310040773.1A patent/CN116203324A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107230842B (en) | System and method for array antenna calibration | |
| CN110839204B (en) | Communication optimization method and device of IRS auxiliary communication system | |
| JP7101828B2 (en) | How to calibrate MIMO radar sensors for automobiles | |
| EP0805510B1 (en) | Active array self calibration | |
| CN110764068B (en) | Multi-probe quasi-far field electromagnetic scattering section (RCS) extrapolation test system | |
| JP4342859B2 (en) | Ultrasonic probe and ultrasonic transmitter / receiver using the same | |
| EP1670095A1 (en) | Mutual coupling method for calibrating a phased array | |
| US20060055592A1 (en) | Antenna measurement systems | |
| EP4009071A1 (en) | Method and apparatus for radar accuracy measurements | |
| CN102135610A (en) | Near-field real-time calibration method for human body millimeter wave imaging safety inspection system | |
| CN111323773A (en) | Networking radar power and bandwidth joint optimization distribution method based on radio frequency stealth | |
| CN108427104B (en) | Polarization calibration method of full-polarization multi-input multi-output synthetic aperture radar (FP-MIMO-SAR) | |
| KR101633841B1 (en) | Array antenna system | |
| EP3358360B1 (en) | System and method for testing with respect to a far-field region | |
| EP3376240B1 (en) | Measuring system and method with digital quiet zone | |
| CN116203324A (en) | MIMO array near-field measurement system and method | |
| CN112859023B (en) | Phased array weather radar's calibration system | |
| CN114706045A (en) | Networking radar power time joint optimization method for multi-target tracking under space frequency perception | |
| US11005581B1 (en) | Calibration of an antenna array that uses low-resolution phase shifters | |
| US20210076971A1 (en) | Monitoring Vital Sign of Occupant in a Vehicle Seat | |
| CN117054980A (en) | Receiving channel calibration method for integrated digital array radar | |
| CN102860844A (en) | Device and method for monitoring bovid growth conditions based on flexible ultrasonic phased array | |
| EP3751306B1 (en) | System and method for testing a radar | |
| CN114252707B (en) | Array antenna calibration device, method and system | |
| CN202859152U (en) | Bovid growth condition monitoring device based on soft ultrasonic phased array |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |