CN113124649B - Control method and device for microwave transmitting array in microwave drying system - Google Patents
Control method and device for microwave transmitting array in microwave drying system Download PDFInfo
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- CN113124649B CN113124649B CN202110349016.3A CN202110349016A CN113124649B CN 113124649 B CN113124649 B CN 113124649B CN 202110349016 A CN202110349016 A CN 202110349016A CN 113124649 B CN113124649 B CN 113124649B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/32—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action
- F26B3/34—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action by using electrical effects
- F26B3/347—Electromagnetic heating, e.g. induction heating or heating using microwave energy
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
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- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
Abstract
The invention provides a control method and a device for a microwave transmitting array in a microwave drying system, wherein the method comprises the following steps: carrying out phase calibration on the microwave transmitting array; determining the coverage area of the microwave beam of the microwave transmitting array according to the appearance geometric parameters of the articles to be dried; determining a directional diagram of a microwave transmitting array; and determining the phase and amplitude information of each transmitting unit in the microwave transmitting array based on the adaptive beam forming technology to obtain the microwaves conforming to the directional diagram. Determining the coverage area of the microwave beam of the microwave transmitting array according to the appearance geometric parameters of the articles to be dried; the directional diagram of the microwave transmitting array is determined, so that accurate microwave transmission is realized, drying is uniform, and the energy utilization rate and safety are improved.
Description
Technical Field
The invention relates to the technical field of microwave drying control, in particular to a control method and a control device for a microwave transmitting array in a microwave drying system.
Background
Microwaves are electromagnetic waves with specific wavelengths, have strong penetrating power and are widely applied to heating of water-containing articles. With the progress of industrialization, microwaves are used for drying and drying food, industrial raw materials, traditional Chinese medicinal materials and many industrial products.
The existing microwave drying system generally adopts a single microwave transmitting unit, and adopts a mode of installing a rotatable metal sheet around the microwave transmitting unit to change the direction of microwave, so as to achieve the purpose of heating the dried articles. Some microwave drying systems adopt array microwave transmitting units, but each microwave transmitting unit usually works relatively independently, so that uniform phase and amplitude control cannot be achieved, articles in a designated area cannot be added, and more accurate article drying control cannot be achieved. Moreover, the heating power regulation range of the existing microwave drying system is generally smaller.
In addition, the metal sheet rotation and simple array mode adopted by the prior art cannot achieve a relatively uniform heating effect, and heating power needs to be increased in order to sufficiently dry all the articles to be dried. The increase of the heating power can not only lead to the increase of energy consumption, but also easily lead to the overhigh heating temperature of the articles to be dried in the area with higher microwave energy, thus leading to the damage of the articles to be dried, even causing fire accidents, leading to the occurrence of fire and having huge potential safety hazards.
Therefore, the existing microwave drying technology has the problems of high energy consumption, low energy utilization rate, large potential safety hazard, uneven drying effect and the like, and how to solve the problems is a technical problem to be solved urgently by technical personnel in the field.
Disclosure of Invention
The invention provides a control method and a control device for a microwave transmitting array in a microwave drying system, which are used for solving the technical problems of high energy consumption, low energy utilization rate, large potential safety hazard and uneven drying effect in the existing microwave drying technology and improving the energy utilization rate and the safety.
The invention provides a control method for a microwave transmitting array in a microwave drying system, which comprises the following steps:
carrying out phase calibration on the microwave transmitting array;
determining the coverage area of the microwave beam of the microwave transmitting array according to the appearance geometric parameters of the articles to be dried;
determining a directional diagram of a microwave transmitting array;
and determining the phase and amplitude information of each transmitting unit in the microwave transmitting array based on the adaptive beam forming technology to obtain the microwaves conforming to the directional diagram.
Further, the microwave transmitting array comprises: 36 microwave transmitting units;
the 36 microwave transmitting units are arranged into a 6 x 6 square matrix array;
the 36 microwave transmitting units are driven by an active amplifying circuit;
the power of the 36 microwave transmitting units is adjustable.
Further, the phase calibration of the microwave transmitting array is realized by adopting a load self-adaptive algorithm.
Further, the determining the coverage area of the microwave beam of the microwave transmitting array according to the appearance geometric parameters of the articles to be dried includes:
receiving geometric parameters of the articles to be dried, which are input by a user;
and setting the geometric size of the coverage area of the microwave beam to be consistent with the minimum geometric edge required by the articles to be dried according to the geometric parameters to obtain the coverage area of the microwave beam of the microwave transmitting array.
Further, said determining a microwave emission array pattern of a microwave emission array comprises:
determining the track of the microwave when the microwave propagates in the space according to the microwave beam coverage area;
determining a microwave transmitting array weighting vector W and a microwave transmitting array signal covariance matrix R according to the geometric parameters X And a microwave transmitting array linear constraint matrix C and a microwave transmitting matrix constraint vector g.
Further, the determining phase and amplitude information of each transmitting unit in the microwave transmitting array based on the adaptive beamforming technology to obtain the microwaves conforming to the directional diagram includes:
the minimum variance type beam forming technology is realized by adopting narrowband signal adaptive filtering;
the minimum variance beamforming technique employs a plurality of linear constraints, the constraint equation being:
in the formula, min represents the minimum value, W is the weighting vector of the microwave transmitting array, R X A microwave transmitting array signal covariance matrix is obtained, C is a microwave transmitting array linear constraint matrix, and g is a microwave transmitting matrix constraint vector;
obtaining a solution to the optimization problem based on the constraint equation:
in the formula, W opt For optimal solution of the weighting vector of the microwave transmitting array, R X A microwave transmitting array signal covariance matrix is obtained, C is a microwave transmitting array linear constraint matrix, and g is a microwave transmitting matrix constraint vector;
main beam pointing angle theta 0 The interference direction angle is theta k K is the number of interference vectors, K is the serial number of the interference vectors, and K is 1,2, …, K, so as to obtain the microwave transmitting array linear constraint matrix
C＝[a(θ 0 ),a(θ 1 ),a(θ 2 ),…,a(θ K )]
Wherein a is a microwave emission linear constraint vector;
the microwave emission matrix constraint vector is: g-1, 0,0, …,0
Diagonally loading the microwave transmitting matrix: r X ＝CC H +σI；
Wherein σ is a positive real number;
the transmission parameters of each transmitting unit in the microwave transmitting array can be obtained by solving the following equation:
wherein, | W H a(θ k )| 2 ＝W H a(θ k )a(θ k ) H W
In the formula, min represents the minimum value, W is the microwave transmitting array weighting vector, a is the microwave transmitting linear constraint vector, and theta 0 For main beam pointing angle, theta k Is the interference direction angle.
Further, the determining phase and amplitude information of each transmitting unit in the microwave transmitting array based on the adaptive beamforming technology to obtain the microwaves conforming to the directional diagram includes:
setting microwave transmitting array parameters including the number of microwave transmitting units, the spacing of the microwave transmitting units, the microwave transmitting frequency, the number and the angle of microwave transmitting beams and the number and the positions of nulls;
calculating the weighting coefficient of each microwave transmitting unit for realizing self-adaptive beam forming under the frequency according to the microwave transmitting frequency;
on the frequency domain, storing the weighted emission coefficient of each microwave array emission unit, wherein the weighted emission coefficient table can be obtained by using an interpolation algorithm and stored in a digital chip;
and after the microwave transmitting arrays start to work, corresponding weighting vector signals are output according to the weighting coefficient table of each microwave array transmitting unit along with the change of time.
In a second aspect, an embodiment of the present invention provides a control device for a microwave emitting array in a microwave drying system, including:
the phase calibration module is used for carrying out phase calibration on the microwave transmitting array;
the area determining module is used for determining the coverage area of the microwave beams of the microwave transmitting array according to the appearance geometric parameters of the articles to be dried;
the direction determining module is used for determining a directional diagram of a microwave transmitting array of the microwave transmitting array;
and the beam forming module is used for determining the phase and amplitude information of each transmitting unit in the microwave transmitting array based on an adaptive beam forming technology to obtain the microwaves conforming to the directional diagram.
The invention also provides an electronic device, which comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the processor executes the program to realize the steps of the control method for the microwave transmitting array in the microwave drying system.
The present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when being executed by a processor, carries out the steps of the method for controlling a microwave transmitting array in a microwave drying system as set forth in any one of the above.
The invention provides a control method and a device for a microwave transmitting array in a microwave drying system, which determine the coverage area of a microwave beam of the microwave transmitting array according to the appearance geometric parameters of an article to be dried; the directional diagram of the microwave transmitting array is determined, so that accurate microwave transmission is realized, drying is uniform, and the energy utilization rate and safety are improved.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a flowchart illustrating a control method for a microwave transmitting array in a microwave drying system according to the present invention;
FIG. 2 is a schematic diagram of a microwave transmitting array for use in a microwave drying system according to the present invention;
FIG. 3 is a schematic diagram of the relationship between the microwave transmitting array and the coverage area of the microwave beam provided by the present invention;
fig. 4 is a second flowchart of a control method for a microwave transmitting array in a microwave drying system according to the present invention;
fig. 5 is a third flowchart of a control method for a microwave transmitting array in a microwave drying system according to the present invention;
fig. 6 is a schematic composition diagram of a control device for a microwave emitting array in a microwave drying system according to an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of an electronic device provided by the present invention;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The control method of the microwave transmitting array for the microwave drying system of the present invention is described below with reference to fig. 1 to 5.
Fig. 1 is a flowchart illustrating a control method for a microwave transmitting array in a microwave drying system according to the present invention; FIG. 2 is a schematic diagram of a microwave transmitting array for use in a microwave drying system according to the present invention; FIG. 3 is a schematic diagram of the relationship between the microwave transmitting array and the coverage area of the microwave beam provided by the present invention; fig. 4 is a second flowchart of a control method for a microwave transmitting array in a microwave drying system according to the present invention; fig. 5 is a third flowchart of a control method for a microwave transmitting array in a microwave drying system according to the present invention.
In one embodiment, the present invention provides a method for controlling a microwave transmitting array in a microwave drying system, including:
step 110: carrying out phase calibration on the microwave transmitting array;
specifically, referring to fig. 2, the microwave transmitting array is composed of 36 microwave transmitting units, the 36 microwave transmitting units are arranged in a 6 × 6 square matrix array, and the 36 microwave transmitting units are driven by a plurality of groups of active amplifying circuits. The rated power of each microwave transmitting unit in the 36 microwave transmitting units is 1kW, the maximum drying power of the microwave transmitting array system is the sum of the rated transmitting powers of all the microwave transmitting units, and the power is adjustable. The microwave transmitting frequency of each microwave transmitting unit in the plurality of microwave transmitting units is 2.4 GHz.
Because the performance of active amplification devices of the same type cannot be ensured to be completely consistent by the existing production level, the electric signals amplified by the plurality of groups of active amplification circuits can generate phase and amplitude deviation, so that the control precision of a directional diagram is reduced in subsequent steps, the drying effect is influenced, and the energy utilization efficiency is reduced. Based on the above implementation, the microwave transmitting array needs to be phase-calibrated. The microwave array phase calibration is realized by adopting a load self-adaptive algorithm.
The radio frequency emission array phase calibration has a self-checking function, and can detect whether the phase calibration is successful or not, and the drying effect and the energy utilization efficiency are influenced by the failed phase calibration. Continuing the next step when the detected phase alignment is successful; when a calibration failure is detected, the operator is required to choose to proceed to the next step or to perform maintenance.
In one embodiment of the invention, the microwave transmitting array comprises: 36 microwave transmitting units; the 36 microwave transmitting units are arranged into a 6 x 6 square matrix array; the 36 microwave transmitting units are driven by an active amplifying circuit; the power of the 36 microwave transmitting units is adjustable. The phase calibration of the microwave transmitting array is realized by adopting a load self-adaptive algorithm.
Step 120: determining a coverage area of a microwave beam of a microwave transmitting array according to the appearance geometric parameters of the articles to be dried;
specifically, according to the geometric parameters of the appearance of the articles to be dried, the control method for the microwave transmitting array in the microwave drying system disclosed by the invention can enable the geometric size of the coverage area of the microwave beam to be consistent with that of the articles to be dried, and the geometric parameters of the articles to be dried can be input into the microwave drying system by an operator.
Specifically, the geometric parameters of the articles to be dried, which are input by a user, can be received; and setting the geometric dimension of the microwave beam coverage area to be consistent with the minimum geometric edge required by the articles to be dried according to the geometric parameters to obtain the microwave beam coverage area of the microwave transmitting array.
Specifically, please refer to fig. 3, wherein 1 is a microwave transmitting array, and 2 is a microwave beam coverage area. According to the appearance geometric parameters of the articles to be dried, the control method for the microwave transmitting array in the microwave drying system can set the geometric dimension of the coverage area of the microwave beam to be consistent with the minimum geometric edge required by the articles to be dried, and the geometric parameters of the articles to be dried can be input into the microwave drying system by an operator.
Generally, the microwave beam coverage area is set as a rectangular area with the geometric center of the microwave transmitting array as a diagonal intersection point and four sides parallel to the outer edge of the microwave transmitting array, and specifically, the input parameters are the length a and the width b of the rectangle.
Step 130: determining a directional diagram of a microwave transmitting array;
the microwave beam coverage area is determined according to the geometric parameters of the articles to be dried, the microwave emission array directional diagram refers to a specific track of microwaves in space propagation, the microwaves exist only in the area covered by the directional diagram, but do not exist in the area uncovered by the directional diagram, the microwave beam can be controlled by controlling the directional diagram of the microwave emission array, and further, the precise control of microwave energy is realized.
In order to determine the directional diagram of the microwave transmitting array, the track of the microwave when propagating in the space can be determined according to the microwave beam coverage area; and determining a microwave transmitting array weighting vector W, a microwave transmitting array signal covariance matrix RX, a microwave transmitting array linear constraint matrix C and a microwave transmitting array constraint vector g according to the geometric parameters.
Specifically, according to the microwave beam coverage area determined by the geometric parameters of the articles to be dried in step 120, the microwave emission array directional diagram refers to a specific track of microwaves during propagation in space, the microwaves exist only in the area covered by the directional diagram, but do not exist in the area not covered by the directional diagram, and the microwave beam can be controlled by controlling the directional diagram of the microwave emission array, so that the microwave energy can be accurately controlled.
According to the length a and the width b of the geometric parameter rectangle, determining a microwave transmitting array weighting vector W, a microwave transmitting array signal covariance matrix RX, a microwave transmitting array linear constraint matrix C and a microwave transmitting matrix constraint vector g.
Step 140: and determining the phase and amplitude information of each transmitting unit in the microwave transmitting array based on the adaptive beam forming technology to obtain the microwaves conforming to the directional diagram.
Specifically, in the embodiment of the present invention, 2.4GHz microwave is used as the transmission frequency, and the frequency does not change during the operation process, so that the transmission microwave is a narrowband signal. The invention adopts narrowband signal adaptive filtering to realize the minimum variance type wave beam forming technology.
Specifically, the optimization problem is solved first, the minimum variance beamforming technique adopts a plurality of linear constraint conditions, and the constraint equation is as follows:
in the formula, min represents the minimum value, W is a microwave transmitting array weighting vector, RX is a microwave transmitting array signal covariance matrix, C is a microwave transmitting array linear constraint matrix, and g is a microwave transmitting matrix constraint vector;
obtaining a solution to the optimization problem based on the constraint equation:
wopt is the optimal solution of the microwave transmitting array weighting vector, RX is a microwave transmitting array signal covariance matrix, C is a microwave transmitting array linear constraint matrix, and g is a microwave transmitting matrix constraint vector;
the main beam has a pointing angle theta 0 The interference direction angle is theta k K is the number of interference vectors, K is the serial number of the interference vectors, and K is 1,2, …, K, so as to obtain the microwave transmitting array linear constraint matrix
C＝[a(θ 0 ),a(θ 1 ),a(θ 2 ),…,a(θ K )]
Wherein a is a microwave emission linear constraint vector;
the microwave emission matrix constraint vector is: g-1, 0,0, …,0
Diagonally loading the microwave transmitting matrix: r X ＝CC H +σI
Wherein σ is a positive real number;
the transmission parameters of each transmitting unit in the microwave transmitting array can be obtained by solving the following equations:
wherein, | W H a(θ k )| 2 ＝W H a(θ k )a(θ k ) H W
In the formula, min represents the minimum value, W is the microwave transmitting array weighting vector, a is the microwave transmitting linear constraint vector, and theta 0 Is the main beam pointing angle, theta k Is the interference direction angle.
On the basis of any of the above embodiments, in this embodiment, the phase and amplitude information of each transmitting unit in the microwave transmitting array is determined based on an adaptive beamforming technology, so as to obtain the microwaves conforming to the directional pattern, specifically, the following steps may be performed:
step 210: setting microwave transmitting array parameters including the number of microwave transmitting units, the spacing between the microwave transmitting units, the microwave transmitting frequency, the number and the angle of microwave transmitting beams and the number and the positions of nulls;
step 220: calculating the weighting coefficient of each microwave transmitting unit for realizing self-adaptive beam forming under the frequency according to the microwave transmitting frequency;
step 230: on the frequency domain, storing the weighted emission coefficient of each microwave array emission unit, wherein the weighted coefficient table can be obtained by utilizing an interpolation algorithm and stored in a digital chip;
step 240: and after the microwave transmitting arrays start to work, corresponding weighting vector signals are output according to the weighting coefficient table of each microwave array transmitting unit along with the change of time.
As shown in fig. 5, firstly, step 1, phase calibration of the microwave transmitting array is performed; the control method for the microwave transmitting array in the microwave drying system comprises a microwave transmitting array, please refer to fig. 2, wherein the microwave transmitting array is composed of 36 microwave transmitting units, the 36 microwave transmitting units are arranged into a 6 × 6 square array, and the 36 microwave transmitting units are driven by a plurality of groups of active amplifying circuits. The rated power of each microwave transmitting unit in the 36 microwave transmitting units is 1kW, the maximum drying power of the microwave transmitting array system is the sum of the rated transmitting powers of all the microwave transmitting units, and the power is adjustable. The microwave transmitting frequency of each microwave transmitting unit in the plurality of microwave transmitting units is 2.4 GHz. Because the performance of the active amplification devices of the same type can not be ensured to be completely consistent by the existing production level, the electric signals amplified by the plurality of groups of active amplification circuits can generate phase and amplitude shifts, so that the control precision of a directional diagram is reduced in the subsequent steps, the drying effect is influenced, and the energy utilization efficiency is reduced. Based on the above implementation, the microwave transmitting array needs to be phase-calibrated. The microwave array phase calibration is realized by adopting a load self-adaptive algorithm. The radio frequency emission array phase calibration has a self-checking function, and can detect whether the phase calibration is successful or not, and the drying effect and the energy utilization efficiency are influenced by the failed phase calibration. When the detected phase calibration is successful, entering the step 2; when a calibration failure is detected, the operator is required to choose to go to step 2 or to perform maintenance.
2. Determining a microwave beam coverage area according to the appearance geometric parameters of the articles to be dried;
referring to fig. 3, 1 is a microwave transmitting array, and 2 is a microwave beam coverage area. According to the appearance geometric parameters of the articles to be dried, the control method for the microwave transmitting array in the microwave drying system can set the geometric dimension of the coverage area of the microwave wave beams to be consistent with the minimum geometric edge required by the articles to be dried, and the geometric parameters of the articles to be dried can be input into the microwave drying system by an operator.
Generally, the microwave beam coverage area is set as a rectangular area with the geometric center of the microwave transmitting array as a diagonal intersection point and four sides parallel to the outer edge of the microwave transmitting array, and specifically, the input parameters are the length a and the width b of the rectangle.
3. Determining a microwave emission array directional diagram;
and (3) determining a microwave beam coverage area according to the geometric parameters of the articles to be dried in the step (2), wherein the microwave emission array directional diagram refers to a specific track of microwaves in the propagation process in space, the microwaves exist only in the area covered by the directional diagram, but do not exist in the area uncovered by the directional diagram, and the microwave beam can be controlled by controlling the directional diagram of the microwave emission array, so that the microwave energy can be accurately controlled.
According to the length a and the width b of the geometric parameter rectangle, determining a microwave transmitting array weighting vector W, a microwave transmitting array signal covariance matrix RX, a microwave transmitting array linear constraint matrix C and a microwave transmitting matrix constraint vector g
4. And (3) determining the phase and amplitude information of each transmitting unit in the microwave transmitting array by adopting a self-adaptive beam forming technology according to the electromagnetic wave interference principle to obtain the microwave transmitting array directional diagram in the step (3).
The invention adopts 2.4GHz microwave as transmitting frequency, which will not change in working process, so the transmitting microwave is a narrow-band signal. The invention adopts narrowband signal adaptive filtering to realize the minimum variance type wave beam forming technology.
The control method for the microwave transmitting array in the microwave drying system determines the coverage area of the microwave beam of the microwave transmitting array according to the appearance geometric parameters of the articles to be dried; the directional diagram of the microwave transmitting array is determined, so that accurate microwave transmission is realized, drying is uniform, and the energy utilization rate and safety are improved.
The control device for the microwave transmitting array in the microwave drying system provided by the present invention is described below, and the control device for the microwave transmitting array in the microwave drying system described below and the control method for the microwave transmitting array in the microwave drying system described above may be referred to correspondingly.
Referring to fig. 6, fig. 6 is a schematic composition diagram of a control device for a microwave emitting array in a microwave drying system according to an embodiment of the present invention.
An embodiment of the present invention provides a control apparatus 600 for a microwave emitting array in a microwave drying system, including:
the phase calibration module 610 is used for performing phase calibration on the microwave transmitting array;
the area determining module 620 is configured to determine a coverage area of a microwave beam of the microwave emitting array according to the geometric appearance parameter of the article to be dried;
a direction determining module 630 for determining a directional pattern of a microwave transmitting array of the microwave transmitting array;
and the beam forming module 640 is configured to determine phase and amplitude information of each transmitting unit in the microwave transmitting array based on an adaptive beam forming technique, so as to obtain microwaves conforming to the directional diagram.
Fig. 7 illustrates a physical structure diagram of an electronic device, and as shown in fig. 7, the electronic device may include: a processor (processor)710, a communication Interface (Communications Interface)720, a memory (memory)730, and a communication bus 740, wherein the processor 710, the communication Interface 720, and the memory 730 communicate with each other via the communication bus 740. Processor 710 may invoke logic instructions in memory 730 to perform a method of controlling a microwave transmitting array in a microwave drying system, the method comprising: carrying out phase calibration on the microwave transmitting array; determining the coverage area of the microwave beam of the microwave transmitting array according to the appearance geometric parameters of the articles to be dried; determining a directional diagram of a microwave transmitting array of the microwave transmitting array; and determining the phase and amplitude information of each transmitting unit in the microwave transmitting array based on the adaptive beam forming technology to obtain the microwaves conforming to the directional diagram.
In addition, the logic instructions in the memory 730 can be implemented in the form of software functional units and stored in a computer readable storage medium when the software functional units are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In another aspect, the present invention also provides a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions, which when executed by a computer, enable the computer to execute the control method for a microwave transmitting array in a microwave drying system provided by the above methods, the method comprising: carrying out phase calibration on the microwave transmitting array; determining the coverage area of the microwave beam of the microwave transmitting array according to the appearance geometric parameters of the articles to be dried; determining a directional diagram of a microwave transmitting array; and determining the phase and amplitude information of each transmitting unit in the microwave transmitting array based on the adaptive beam forming technology to obtain the microwaves conforming to the directional diagram.
In still another aspect, the present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored, the computer program being implemented by a processor to execute the control method for a microwave transmitting array in a microwave drying system provided in the above aspects, the method comprising: carrying out phase calibration on the microwave transmitting array; determining a coverage area of a microwave beam of a microwave transmitting array according to the appearance geometric parameters of the articles to be dried; determining a directional diagram of a microwave transmitting array of the microwave transmitting array; and determining the phase and amplitude information of each transmitting unit in the microwave transmitting array based on the adaptive beam forming technology to obtain the microwaves conforming to the directional diagram.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A control method for a microwave transmitting array in a microwave drying system is characterized by comprising the following steps:
carrying out phase calibration on the microwave transmitting array;
determining the coverage area of the microwave beam of the microwave transmitting array according to the appearance geometric parameters of the articles to be dried;
determining a directional diagram of a microwave transmitting array; the determining of the directional pattern of the microwave emitting array comprises: determining the track of the microwave when the microwave propagates in the space according to the microwave beam coverage area; determining a microwave transmitting array weighting vector W and a microwave transmitting array signal covariance matrix R according to the geometric parameters X A microwave transmitting array linear constraint matrix C and a microwave transmitting matrix constraint vector g;
determining the phase and amplitude information of each transmitting unit in the microwave transmitting array based on the adaptive beam forming technology to obtain the microwaves conforming to the directional diagram;
the determining phase and amplitude information of each transmitting unit in the microwave transmitting array based on the adaptive beamforming technology to obtain the microwaves conforming to the directional diagram comprises:
the minimum variance type beam forming technology is realized by adopting narrowband signal adaptive filtering;
the minimum variance beamforming technique employs a plurality of linear constraints, the constraint equation being:
wherein min represents the minimum value, W is the weighting vector of the microwave emitting array, R X Is a littleA wave transmitting array signal covariance matrix, wherein C is a microwave transmitting array linear constraint matrix, and g is a microwave transmitting matrix constraint vector;
obtaining a solution to the optimization problem based on the constraint equation:
in the formula, W opt For optimal solution of the weighting vector of the microwave transmitting array, R X A microwave transmitting array signal covariance matrix is obtained, C is a microwave transmitting array linear constraint matrix, and g is a microwave transmitting matrix constraint vector;
the main beam is directed at an angle of
The interference direction angle is
，KAs to the number of interference vectors,
is the sequence number of the interference vector,
to obtain a microwave transmitting array linear constraint matrix
In the formula (I), the compound is shown in the specification,
is a microwave emission linear constraint vector;
the microwave emission matrix constraint vector is:
；
diagonally loading the microwave transmitting matrix:
；
in the formula (I), the compound is shown in the specification,
is a positive real number;
the transmission parameters of each transmitting unit in the microwave transmitting array can be obtained by solving the following equations:
wherein the content of the first and second substances,
；
in the formula, min represents the minimum value, W is the microwave transmitting array weighting vector,
is a linear constraint vector for microwave emission,
the angle of the main beam pointing direction is,
is the interference direction angle.
2. The control method according to claim 1,
the microwave transmitting array comprises: 36 microwave transmitting units;
the 36 microwave transmitting units are arranged into a 6 x 6 square matrix array;
the 36 microwave transmitting units are driven by an active amplifying circuit;
the power of the 36 microwave transmitting units is adjustable.
3. The control method according to claim 1,
the phase calibration of the microwave transmitting array is realized by adopting a load self-adaptive algorithm.
4. The control method according to claim 1,
the step of determining the coverage area of the microwave beam of the microwave transmitting array according to the appearance geometric parameters of the articles to be dried comprises the following steps:
receiving geometric parameters of the articles to be dried, which are input by a user;
and setting the geometric size of the coverage area of the microwave beam to be consistent with the minimum geometric edge required by the articles to be dried according to the geometric parameters to obtain the coverage area of the microwave beam of the microwave transmitting array.
5. The control method according to any one of claims 1 to 4,
the determining phase and amplitude information of each transmitting unit in the microwave transmitting array based on the adaptive beamforming technology to obtain the microwaves conforming to the directional diagram comprises:
setting microwave transmitting array parameters including the number of microwave transmitting units, the spacing of the microwave transmitting units, the microwave transmitting frequency, the number and the angle of microwave transmitting beams and the number and the positions of nulls;
calculating the weighting coefficient of each microwave transmitting unit for realizing self-adaptive beam forming under the frequency according to the microwave transmitting frequency;
on the frequency domain, storing the weighted emission coefficient of each microwave array emission unit, wherein the weighted coefficient table can be obtained by utilizing an interpolation algorithm and stored in a digital chip;
and after the microwave transmitting arrays start to work, corresponding weighting vector signals are output according to the weighting coefficient table of each microwave array transmitting unit along with the change of time.
6. A control apparatus for a microwave transmitting array in a microwave drying system, comprising:
the phase calibration module is used for carrying out phase calibration on the microwave transmitting array;
the area determining module is used for determining the coverage area of the microwave beams of the microwave transmitting array according to the appearance geometric parameters of the articles to be dried;
the direction determining module is used for determining a directional diagram of a microwave transmitting array of the microwave transmitting array; the determining of the directional pattern of the microwave emitting array comprises: determining the track of the microwave when the microwave propagates in the space according to the microwave beam coverage area; determining a microwave transmitting array weighting vector W and a microwave transmitting array signal covariance matrix R according to the geometric parameters X A microwave transmitting array linear constraint matrix C and a microwave transmitting matrix constraint vector g;
the wave beam forming module is used for determining the phase and amplitude information of each transmitting unit in the microwave transmitting array based on the self-adaptive wave beam forming technology to obtain the microwaves conforming to the directional diagram;
the determining phase and amplitude information of each transmitting unit in the microwave transmitting array based on the adaptive beamforming technology to obtain the microwaves conforming to the directional diagram comprises:
the minimum variance type beam forming technology is realized by adopting narrowband signal adaptive filtering;
the minimum variance beamforming technique employs a plurality of linear constraints, the constraint equation being:
in the formula, min represents the minimum value, W is the weighting vector of the microwave transmitting array, R X A microwave transmitting array signal covariance matrix is obtained, C is a microwave transmitting array linear constraint matrix, and g is a microwave transmitting matrix constraint vector;
obtaining a solution to the optimization problem based on the constraint equation:
in the formula, W opt For optimal solution of the weighting vector of the microwave transmitting array, R X A microwave transmitting array signal covariance matrix is obtained, C is a microwave transmitting array linear constraint matrix, and g is a microwave transmitting matrix constraint vector;
the main beam is directed at an angle of
The interference direction angle is
，KAs to the number of interference vectors,
is the sequence number of the interference vector,
to obtain a microwave transmitting array linear constraint matrix
In the formula (I), the compound is shown in the specification,
is a microwave emission linear constraint vector;
the microwave emission matrix constraint vector is:
；
diagonally loading the microwave transmitting matrix:
；
in the formula (I), the compound is shown in the specification,
is a positive real number;
the transmission parameters of each transmitting unit in the microwave transmitting array can be obtained by solving the following equations:
wherein the content of the first and second substances,
；
in the formula, min represents the minimum value, W is the microwave transmitting array weighting vector,
is a linear constraint vector for microwave emission,
the angle of the main beam pointing direction is,
is the interference direction angle.
7. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the method for controlling a microwave transmitting array in a microwave drying system according to any of claims 1 to 6 when executing said program.
8. A non-transitory computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method for controlling a microwave transmitting array in a microwave drying system according to any one of claims 1 to 6.
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