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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- 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
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Abstract
本发明提供一种用于微波烘干系统中的微波发射阵列的控制方法及装置，该方法包括：对微波发射阵列进行相位校准；根据待烘干物品的外观几何参数，确定微波发射阵列的微波波束的覆盖区域；确定微波发射阵列的微波发射阵列的方向图；基于自适应波束成形技术确定微波发射阵列中的每一个发射单元的相位、幅度信息，得到符合所述方向图的微波。通过根据待烘干物品的外观几何参数，确定微波发射阵列的微波波束的覆盖区域；确定微波发射阵列的微波发射阵列的方向图，从而实现精确的微波发射，烘干均匀，提高能源利用率和安全性。
The invention provides a control method and device for a microwave transmitting array in a microwave drying system. The method includes: calibrating the phase of the microwave transmitting array; The coverage area of the beam; the pattern of the microwave transmitting array of the microwave transmitting array is determined; the phase and amplitude information of each transmitting unit in the microwave transmitting array is determined based on the adaptive beamforming technology, and the microwaves conforming to the pattern are obtained. By determining the coverage area of the microwave beam of the microwave emitting array according to the geometric parameters of the appearance of the items to be dried; safety.
Description
技术领域technical field
本发明涉及微波烘干控制技术领域，尤其涉及一种用于微波烘干系统中的微波发射阵列的控制方法及装置。The invention relates to the technical field of microwave drying control, in particular to a control method and device for a microwave emission array in a microwave drying system.
背景技术Background technique
微波是一种具有特定波长的电磁波，具有较强的穿透能力，被广泛应用于含水物品的加热。随着工业化进展，微波被用于食品、工业原料、中药材等等许多工业产品的干燥烘干。Microwave is an electromagnetic wave with a specific wavelength, which has strong penetrating ability and is widely used in the heating of water-containing items. With the progress of industrialization, microwaves are used for drying and drying of many industrial products such as food, industrial raw materials, and Chinese medicinal materials.
现有的微波烘干系统一般采取单一微波发射单元，采取在微波发射单元周围安装可转动的金属片的方式使微波方向发生改变，达到加热被烘干物品的目的。部分微波烘干系统采用了阵列微波发射单元，但是每个微波发射单元往往是相对独立工作的，无法做到统一的相位、幅度控制，无法做到对指定区域物品的加入，从而无法实现更精确的物品烘干控制。而且，现有微波烘干系统的加热功率调节范围一般比较小。The existing microwave drying system generally adopts a single microwave emitting unit, and a rotatable metal sheet is installed around the microwave emitting unit to change the direction of the microwave, so as to achieve the purpose of heating the objects to be dried. Some microwave drying systems use array microwave transmitting units, but each microwave transmitting unit often works relatively independently, unable to achieve uniform phase and amplitude control, and unable to add items in designated areas, so that more accurate item drying control. Moreover, the heating power adjustment range of the existing microwave drying system is generally relatively small.
而且现有技术采用的金属片转动和简单阵列的方式往往不能达到比较均匀的加热效果，为了使得全部待烘干物品得到充分的烘干，往往需要增加加热功率。而加热功率的增加不仅会导致能耗的上升，又容易使得微波能量较高区域的待烘干物品加热温度过高，导致待烘干物品损坏，甚至发生起火事故，导致火灾的发生，存在巨大的安全隐患。Moreover, the method of metal sheet rotation and simple array used in the prior art often cannot achieve a relatively uniform heating effect. In order to fully dry all the items to be dried, it is often necessary to increase the heating power. The increase of heating power will not only lead to an increase in energy consumption, but also easily make the heating temperature of the items to be dried in areas with high microwave energy too high, resulting in damage to the items to be dried, and even fire accidents, resulting in the occurrence of fires, and there are huge risks. security risks.
因此，现有的微波烘干技术存在能耗高，能源利用率低，安全隐患大，烘干效果不均匀等问题，如何解决这些问题是本领域技术人员亟待解决的技术问题。Therefore, the existing microwave drying technology has problems such as high energy consumption, low energy utilization rate, potential safety hazard, and uneven drying effect. How to solve these problems is a technical problem to be solved urgently by those skilled in the art.
发明内容SUMMARY OF THE INVENTION
本发明提供一种用于微波烘干系统中的微波发射阵列的控制方法及装置，用以解决现有的微波烘干技术存在能耗高，能源利用率低，安全隐患大，烘干效果不均匀的技术问题，提高能源利用率和安全性。The invention provides a control method and device for a microwave transmitting array in a microwave drying system, which are used to solve the problems of high energy consumption, low energy utilization rate, great safety hazard and poor drying effect in the existing microwave drying technology. Uniform technical issues to improve energy efficiency and safety.
本发明提供一种用于微波烘干系统中的微波发射阵列的控制方法，包括：The present invention provides a control method for a microwave transmitting array in a microwave drying system, comprising:
对微波发射阵列进行相位校准；Phase calibration of the microwave transmitting array;
根据待烘干物品的外观几何参数，确定微波发射阵列的微波波束的覆盖区域；Determine the coverage area of the microwave beam of the microwave transmitting array according to the appearance geometric parameters of the item to be dried;
确定微波发射阵列的微波发射阵列的方向图；Determine the pattern of the microwave transmitting array of the microwave transmitting array;
基于自适应波束成形技术确定微波发射阵列中的每一个发射单元的相位、幅度信息，得到符合所述方向图的微波。The phase and amplitude information of each transmitting unit in the microwave transmitting array is determined based on the adaptive beamforming technology, and microwaves conforming to the pattern are obtained.
进一步地，所述微波发射阵列包括：36个微波发射单元；Further, the microwave transmitting array includes: 36 microwave transmitting units;
所述36个微波发射单元排列为6×6的方阵阵列；The 36 microwave transmitting units are arranged in a 6×6 square array;
所述36个微波发射单元通过有源放大电路驱动；The 36 microwave transmitting units are driven by an active amplifier circuit;
所述36个微波发射单元功率可调。The power of the 36 microwave transmitting units is adjustable.
进一步地，所述微波发射阵列的相位校准采用负载自适应算法实现。Further, the phase calibration of the microwave transmitting array is implemented by a load adaptive algorithm.
进一步地，所述根据待烘干物品的外观几何参数，确定微波发射阵列的微波波束的覆盖区域包括：Further, determining the coverage area of the microwave beam of the microwave transmitting array according to the appearance geometric parameters of the item to be dried includes:
接收用户输入的待烘干物品的几何参数；Receive the geometric parameters of the item to be dried input by the user;
根据所述几何参数将微波波束覆盖区域几何尺寸设定到与待烘干物品所需最小几何边沿相一致，得到微波发射阵列的微波波束的覆盖区域。According to the geometric parameters, the geometric size of the coverage area of the microwave beam is set to be consistent with the minimum geometric edge required for the item to be dried, so as to obtain the coverage area of the microwave beam of the microwave transmitting array.
进一步地，所述确定微波发射阵列的微波发射阵列的方向图包括：Further, the determining the pattern of the microwave transmitting array of the microwave transmitting array includes:
根据所述微波波束覆盖区域确定微波在空间中传播时的轨迹；determining the trajectory of the microwave when propagating in space according to the coverage area of the microwave beam;
根据几何参数确定微波发射阵列加权矢量W，微波发射阵列信号协方差矩阵RX，微波发射阵列线性约束矩阵C，微波发射矩阵约束向量g。According to the geometric parameters, determine the microwave transmitting array weight vector W, the microwave transmitting array signal covariance matrix R X , the microwave transmitting array linear constraint matrix C, and the microwave transmitting matrix constraint vector g.
进一步地，所述基于自适应波束成形技术确定微波发射阵列中的每一个发射单元的相位、幅度信息，得到符合所述方向图的微波包括：Further, determining the phase and amplitude information of each transmitting unit in the microwave transmitting array based on the adaptive beamforming technology, and obtaining the microwave conforming to the pattern includes:
采用窄带信号自适应滤波实现最小方差式波束成形技术；Adopt narrowband signal adaptive filtering to realize minimum variance beamforming technology;
最小方差波束成形技术采用多个线性约束条件，约束方程是：The minimum variance beamforming technique employs multiple linear constraints, and the constraint equation is:
式中，min表示取最小值，W为微波发射阵列加权矢量，RX为微波发射阵列信号协方差矩阵，C为微波发射阵列线性约束矩阵，g为微波发射矩阵约束向量；where min represents the minimum value, W is the weighting vector of the microwave transmitting array, R X is the signal covariance matrix of the microwave transmitting array, C is the linear constraint matrix of the microwave transmitting array, and g is the constraint vector of the microwave transmitting array;
基于所述约束方程得到最优化问题的解：The solution to the optimization problem is obtained based on the constraint equation:
式中，Wopt为微波发射阵列加权矢量的最优解，RX为微波发射阵列信号协方差矩阵，C为微波发射阵列线性约束矩阵，g为微波发射矩阵约束向量；In the formula, W opt is the optimal solution of the microwave transmission array weighting vector, R X is the microwave transmission array signal covariance matrix, C is the microwave transmission array linear constraint matrix, and g is the microwave transmission matrix constraint vector;
主波束指向角度为θ0，干扰方向角度为θk，K为干扰矢量的数量，k为干扰矢量的序号，k＝1,2,…,K，得到微波发射阵列线性约束矩阵The pointing angle of the main beam is θ 0 , the angle of the interference direction is θ k , K is the number of interference vectors, k is the serial number of the interference vectors, k=1,2,…,K, and the linear constraint matrix of the microwave transmitting array is obtained
C＝[a(θ0),a(θ1),a(θ2),…,a(θK)]C=[a(θ 0 ), a(θ 1 ), a(θ 2 ), ..., a(θ K )]
式中，a是微波发射线性约束矢量；where a is the linear constraint vector of microwave emission;
微波发射矩阵约束向量为：g＝[1,0,0,…,0]The microwave emission matrix constraint vector is: g=[1,0,0,…,0]
对所述微波发射矩阵进行对角加载：RX＝CCH+σI；Diagonally loading the microwave emission matrix: R X =CC H +σI;
式中，σ为正实数；where σ is a positive real number;
微波发射阵列中的每一个发射单元的发射参数可以通过求解下面的方程而得到：The transmit parameters of each transmit unit in the microwave transmit array can be obtained by solving the following equations:
其中，|WHa(θk)|2＝WHa(θk)a(θk)HWwhere |W H a(θ k )| 2 =W H a(θ k )a(θ k ) H W
式中，min表示最小值，W为微波发射阵列加权矢量，a是微波发射线性约束矢量，θ0为主波束指向角度，θk为干扰方向角度。In the formula, min represents the minimum value, W is the weighting vector of the microwave transmission array, a is the linear constraint vector of the microwave transmission, θ 0 is the main beam pointing angle, and θ k is the interference direction angle.
进一步地，所述基于自适应波束成形技术确定微波发射阵列中的每一个发射单元的相位、幅度信息，得到符合所述方向图的微波包括：Further, determining the phase and amplitude information of each transmitting unit in the microwave transmitting array based on the adaptive beamforming technology, and obtaining the microwave conforming to the pattern includes:
设定微波发射阵列参数，包括微波发射单元个数，微波发射单元间距，微波发射频率，微波发射波束个数和角度，零陷个数和位置；Set the parameters of the microwave transmitting array, including the number of microwave transmitting units, the spacing of microwave transmitting units, the frequency of microwave transmitting, the number and angle of microwave transmitting beams, the number and position of nulls;
根据所述微波发射频率计算该频率下实现自适应波束成形的各个微波发射单元的加权系数；Calculate, according to the microwave transmission frequency, the weighting coefficient of each microwave transmission unit that implements adaptive beamforming at the frequency;
在频域上，存储每一个微波阵列发射单元的加权发射系数，所述加权系数表可以利用插值算法得到，并存储在数字芯片中；In the frequency domain, the weighted transmission coefficient of each microwave array transmission unit is stored, and the weighted coefficient table can be obtained by using an interpolation algorithm and stored in a digital chip;
微波发射阵列开始工作后，随着时间的变化，根据各个微波阵列发射单元加权系数表，输出相应的加权矢量信号。After the microwave transmitting array starts to work, with the change of time, the corresponding weighted vector signal is output according to the weighting coefficient table of each microwave array transmitting unit.
第二方面，本发明实施例提供一种用于微波烘干系统中的微波发射阵列的控制装置，包括：In a second aspect, an embodiment of the present invention provides a control device for a microwave emission array in a microwave drying system, including:
相位校准模块，用于对微波发射阵列进行相位校准；The phase calibration module is used for phase calibration of the microwave transmitting array;
区域确定模块，用于根据待烘干物品的外观几何参数，确定微波发射阵列的微波波束的覆盖区域；The area determination module is used to determine the coverage area of the microwave beam of the microwave transmitting array according to the appearance geometric parameters of the item to be dried;
方向确定模块，用于确定微波发射阵列的微波发射阵列的方向图；a direction determination module for determining the direction diagram of the microwave transmitting array of the microwave transmitting array;
波束成型模块，用于基于自适应波束成形技术确定微波发射阵列中的每一个发射单元的相位、幅度信息，得到符合所述方向图的微波。The beamforming module is used for determining the phase and amplitude information of each transmitting unit in the microwave transmitting array based on the adaptive beamforming technology, so as to obtain microwaves conforming to the pattern.
本发明还提供一种电子设备，包括存储器、处理器及存储在存储器上并可在处理器上运行的计算机程序，所述处理器执行所述程序时实现如上述任一种所述用于微波烘干系统中的微波发射阵列的控制方法的步骤。The present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, when the processor executes the program, the processor implements the above-mentioned application for microwave Steps of a control method for a microwave emission array in a drying system.
本发明还提供一种非暂态计算机可读存储介质，其上存储有计算机程序，该计算机程序被处理器执行时实现如上述任一种所述用于微波烘干系统中的微波发射阵列的控制方法的步骤。The present invention also provides a non-transitory computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, realizes the microwave emission array used in any of the above-mentioned microwave drying systems. The steps of the control method.
本发明提供的一种用于微波烘干系统中的微波发射阵列的控制方法及装置，通过根据待烘干物品的外观几何参数，确定微波发射阵列的微波波束的覆盖区域；确定微波发射阵列的微波发射阵列的方向图，从而实现精确的微波发射，烘干均匀，提高能源利用率和安全性。The invention provides a control method and device for a microwave emitting array in a microwave drying system, by determining the coverage area of the microwave beam of the microwave emitting array according to the appearance geometric parameters of the item to be dried; The pattern of the microwave emission array, so as to achieve accurate microwave emission, uniform drying, and improve energy efficiency and safety.
附图说明Description of drawings
为了更清楚地说明本发明或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作一简单地介绍，显而易见地，下面描述中的附图是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。In order to explain the present invention or the technical solutions in the prior art more clearly, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are the For some embodiments of the invention, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.
图1为本发明提供的一种用于微波烘干系统中的微波发射阵列的控制方法的流程图之一；1 is one of the flow charts of a control method for a microwave transmitting array in a microwave drying system provided by the present invention;
图2为本发明提供的一种用于微波烘干系统中的微波发射阵列的示意图；2 is a schematic diagram of a microwave transmitting array used in a microwave drying system provided by the present invention;
图3为本发明提供的微波发射阵列和微波波束覆盖区域关系示意图；3 is a schematic diagram of the relationship between a microwave transmitting array and a microwave beam coverage area provided by the present invention;
图4为本发明提供的一种用于微波烘干系统中的微波发射阵列的控制方法的流程图之二；4 is the second flow chart of a method for controlling a microwave transmitting array in a microwave drying system provided by the present invention;
图5为本发明提供的一种用于微波烘干系统中的微波发射阵列的控制方法的流程图之三；5 is the third flowchart of a method for controlling a microwave transmitting array in a microwave drying system provided by the present invention;
图6为本发明实施例提供的一种用于微波烘干系统中的微波发射阵列的控制装置的组成示意图；6 is a schematic diagram of the composition of a control device for a microwave emission array in a microwave drying system provided by an embodiment of the present invention;
图7是本发明提供的电子设备的结构示意图；7 is a schematic structural diagram of an electronic device provided by the present invention;
具体实施方式Detailed ways
为使本发明的目的、技术方案和优点更加清楚，下面将结合本发明中的附图，对本发明中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention. , not all examples. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
下面结合图1-图5描述本发明的用于微波烘干系统中的微波发射阵列的控制方法。The control method for the microwave transmitting array in the microwave drying system of the present invention will be described below with reference to FIGS. 1 to 5 .
图1为本发明提供的一种用于微波烘干系统中的微波发射阵列的控制方法的流程图之一；图2为本发明提供的一种用于微波烘干系统中的微波发射阵列的示意图；图3为本发明提供的微波发射阵列和微波波束覆盖区域关系示意图；图4为本发明提供的一种用于微波烘干系统中的微波发射阵列的控制方法的流程图之二；图5为本发明提供的一种用于微波烘干系统中的微波发射阵列的控制方法的流程图之三。FIG. 1 is one of the flow charts of a method for controlling a microwave transmitting array in a microwave drying system provided by the present invention; FIG. 2 is a schematic diagram of a microwave transmitting array used in a microwave drying system provided by the present invention. Schematic diagram; FIG. 3 is a schematic diagram of the relationship between a microwave transmitting array provided by the present invention and a microwave beam coverage area; FIG. 4 is a second flow chart of a control method for a microwave transmitting array in a microwave drying system provided by the present invention; FIG. 5 is the third flow chart of a method for controlling a microwave transmitting array in a microwave drying system provided by the present invention.
在本发明一种具体实施方式中，本发明提供一种用于微波烘干系统中的微波发射阵列的控制方法，包括：In a specific embodiment of the present invention, the present invention provides a control method for a microwave emission array in a microwave drying system, comprising:
步骤110：对微波发射阵列进行相位校准；Step 110: perform phase calibration on the microwave transmitting array;
具体地，一种微波发射阵列，请参阅图2，所述微波发射阵列由36个微波发射单元组成，所述36个微波发射单元排列为6×6的方阵阵列，所述36个微波发射单元由若干组有源放大电路驱动。所述36个微波发射单元中每一个微波发射单元的额定功率为1kW，所述微波发射阵列系统最大烘干功率为所有微波发射单元额定发射功率的总和，且功率可调。所述若干个微波发射单元中每一个微波发射单元的微波发射频率为2.4GHz。Specifically, a microwave transmitting array, please refer 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 array, and the 36 microwave transmitting units The unit is driven by groups of active amplifier circuits. The rated power of each microwave transmitting unit in the 36 microwave transmitting units is 1 kW, and the maximum drying power of the microwave transmitting array system is the sum of the rated transmitting power of all the microwave transmitting units, and the power is adjustable. The microwave emitting frequency of each microwave emitting unit in the plurality of microwave emitting units is 2.4 GHz.
由于现有生产水平无法保证同型号的有源放大器件性能完全一致，经过所述若干组有源放大电路放大的电信号会发生相位、幅度偏移，造成后续步骤中，方向图的控制精度下降，影响烘干效果，降低能量利用效率。基于上述实施，需要对所述微波发射阵列进行相位校准。所述的微波阵列相位校准采用负载自适应算法实现。Since the current production level cannot guarantee that the performance of the active amplifier devices of the same type is completely consistent, the electrical signals amplified by the several groups of active amplifier circuits will be shifted in phase and amplitude, resulting in a decrease in the control accuracy of the pattern in the subsequent steps. , affecting the drying effect and reducing the energy utilization efficiency. Based on the above implementation, it is necessary to perform phase calibration on the microwave transmitting array. The phase calibration of the microwave array is realized by a load adaptive algorithm.
射频发射阵列相位校准具备自检功能，可检测相位校准是否成功，相位校准失败会影响烘干效果和能源利用效率。当检测的相位校准成功时继续后边的步骤；当检测到校准失败时，需要操作人员选择进入步骤下面步骤或是进行检修。The phase calibration of the RF transmitting array has a self-check function, which can detect whether the phase calibration is successful or not. The failure of the phase calibration will affect the drying effect and energy utilization efficiency. When the detected phase calibration is successful, continue with the following steps; when it is detected that the calibration fails, the operator needs to choose to enter the next step of the step or perform maintenance.
在本发明的一种实施例中，所述微波发射阵列包括：36个微波发射单元；所述36个微波发射单元排列为6×6的方阵阵列；所述36个微波发射单元通过有源放大电路驱动；所述36个微波发射单元功率可调。所述微波发射阵列的相位校准采用负载自适应算法实现。In an embodiment of the present invention, the microwave transmitting array includes: 36 microwave transmitting units; the 36 microwave transmitting units are arranged in a 6×6 square array; the 36 microwave transmitting units are Driven by amplifying circuit; the power of the 36 microwave transmitting units is adjustable. The phase calibration of the microwave transmitting array is realized by a load adaptive algorithm.
步骤120：根据待烘干物品的外观几何参数，确定微波发射阵列的微波波束的覆盖区域；Step 120: Determine the coverage area of the microwave beam of the microwave transmitting array according to the appearance geometric parameters of the item to be dried;
具体地，根据待烘干物品的外观几何参数，本发明公开的一种用于微波烘干系统中的微波发射阵列的控制方法可以将微波波束覆盖区域几何尺寸与待烘干物品一致，所述待烘干物品几何参数可由操作人员输入所述微波烘干系统。Specifically, according to the appearance geometric parameters of the items to be dried, a method for controlling a microwave emission array in a microwave drying system disclosed in the present invention can make the geometric size of the microwave beam coverage area consistent with the items to be dried, and the The geometric parameters of the items to be dried can be input into the microwave drying system by the operator.
具体地，可以接收用户输入的待烘干物品的几何参数；根据所述几何参数将微波波束覆盖区域几何尺寸设定到与待烘干物品所需最小几何边沿相一致，得到微波发射阵列的微波波束的覆盖区域。Specifically, the geometric parameters of the items to be dried input by the user can be received; according to the geometric parameters, the geometric size of the coverage area of the microwave beam is set to be consistent with the minimum geometric edge required for the items to be dried, and the microwaves of the microwave emission array are obtained. The coverage area of the beam.
具体地，请参阅图3，其中1是微波发射阵列，2是微波波束覆盖区域。根据待烘干物品的外观几何参数，本发明开的一种用于微波烘干系统中的微波发射阵列的控制方法可以将微波波束覆盖区域几何尺寸设定到与待烘干物品所需最小几何边沿一致，所述待烘干物品几何参数可由操作人员输入所述微波烘干系统。Specifically, please refer to FIG. 3, wherein 1 is the microwave transmitting array, and 2 is the microwave beam coverage area. According to the geometrical parameters of the appearance of the items to be dried, a control method for a microwave emission array in a microwave drying system developed by the present invention can set the geometric size of the coverage area of the microwave beam to the minimum geometry required for the items to be dried If the edges are consistent, the geometric parameters of the items to be dried can be input into the microwave drying system by the operator.
一般的，微波波束覆盖区域设定为微波发射阵列几何中心为对角线交点，四边与微波发射阵列外边沿平行的矩形区域，具体的，输入参数为矩形的长a和宽b。Generally, the microwave beam coverage area is set as a rectangular area with the geometric center of the microwave transmitting array as the intersection of the diagonal lines, and the four sides are parallel to the outer edge of the microwave transmitting array. Specifically, the input parameters are the length a and width b of the rectangle.
步骤130：确定微波发射阵列的微波发射阵列的方向图；Step 130: determining the pattern of the microwave transmitting array of the microwave transmitting array;
根据所述的待烘干物品几何参数确定的微波波束覆盖区域，所述微波发射阵列方向图是指微波在空间中传播时的特定轨迹，所述微波只在方向图覆盖的区域存在，而在方向图未覆盖的区域不存在，通过控制微波发射阵列的方向图即可实现控制微波波束，进一步的，实现对微波能量的精确控制。The microwave beam coverage area determined according to the geometric parameters of the item to be dried, the microwave emission array pattern refers to the specific trajectory of the microwave when it propagates in space, and the microwave only exists in the area covered by the pattern, but in the The area not covered by the pattern does not exist, and the microwave beam can be controlled by controlling the pattern of the microwave transmitting array, and further, the precise control of the microwave energy can be realized.
为了确定微波发射阵列的微波发射阵列的方向图可以根据所述微波波束覆盖区域确定微波在空间中传播时的轨迹；根据几何参数确定微波发射阵列加权矢量W，微波发射阵列信号协方差矩阵RX，微波发射阵列线性约束矩阵C，微波发射矩阵约束向量g。In order to determine the pattern of the microwave transmitting array of the microwave transmitting array, the trajectory of the microwave propagating in space can be determined according to the coverage area of the microwave beam; the weighting vector W of the microwave transmitting array, the signal covariance matrix RX of the microwave transmitting array, and the signal covariance matrix RX of the microwave transmitting array are determined according to the geometric parameters. The linear constraint matrix C of the microwave emission array, and the constraint vector g of the microwave emission matrix.
具体地，根据步骤120所述的待烘干物品几何参数确定的微波波束覆盖区域，所述微波发射阵列方向图是指微波在空间中传播时的特定轨迹，所述微波只在方向图覆盖的区域存在，而在方向图未覆盖的区域不存在，通过控制微波发射阵列的方向图即可实现控制微波波束，进一步的，实现对微波能量的精确控制。Specifically, according to the microwave beam coverage area determined by the geometric parameters of the item to be dried described in
根据几何参数矩形的长a和宽b，确定微波发射阵列加权矢量W，微波发射阵列信号协方差矩阵RX，微波发射阵列线性约束矩阵C，微波发射矩阵约束向量g。According to the length a and width b of the geometric parameter rectangle, determine the microwave transmitting array weight vector W, the microwave transmitting array signal covariance matrix RX, the microwave transmitting array linear constraint matrix C, and the microwave transmitting matrix constraint vector g.
步骤140：基于自适应波束成形技术确定微波发射阵列中的每一个发射单元的相位、幅度信息，得到符合所述方向图的微波。Step 140: Determine the phase and amplitude information of each transmitting unit in the microwave transmitting array based on the adaptive beamforming technology, and obtain microwaves conforming to the pattern.
具体地，由于本发明实施例采用2.4GHz微波作为发射频率，在工作过程中该频率不会发生改变，因此发射微波是一种窄带信号。本发明采用窄带信号自适应滤波实现最小方差式波束成形技术。Specifically, since the embodiment of the present invention adopts the 2.4 GHz microwave as the transmission frequency, the frequency will not change during the working process, so the transmitted microwave is a narrowband signal. The invention adopts the narrowband signal adaptive filtering to realize the minimum variance beamforming technology.
具体的，首先求解最优化问题，最小方差波束成形技术采用多个线性约束条件，约束方程是：Specifically, the optimization problem is first solved. The minimum variance beamforming technique adopts multiple linear constraints. The constraint equation is:
式中，min表示取最小值，W为微波发射阵列加权矢量，RX为微波发射阵列信号协方差矩阵，C为微波发射阵列线性约束矩阵，g为微波发射矩阵约束向量；where min represents the minimum value, W is the weighting vector of the microwave transmitting array, RX is the signal covariance matrix of the microwave transmitting array, C is the linear constraint matrix of the microwave transmitting array, and g is the constraint vector of the microwave transmitting array;
基于所述约束方程得到最优化问题的解：The solution to the optimization problem is obtained based on the constraint equation:
式中，Wopt为微波发射阵列加权矢量的最优解，RX为微波发射阵列信号协方差矩阵，C为微波发射阵列线性约束矩阵，g为微波发射矩阵约束向量；In the formula, Wopt is the optimal solution of the microwave transmission array weighting vector, RX is the microwave transmission array signal covariance matrix, C is the microwave transmission array linear constraint matrix, and g is the microwave transmission matrix constraint vector;
主波束指向角度为θ0，干扰方向角度为θk，K为干扰矢量的数量，k为干扰矢量的序号，k＝1,2,…,K，得到微波发射阵列线性约束矩阵The pointing angle of the main beam is θ 0 , the angle of the interference direction is θ k , K is the number of interference vectors, k is the serial number of the interference vectors, k=1,2,…,K, and the linear constraint matrix of the microwave transmitting array is obtained
C＝[a(θ0),a(θ1),a(θ2),…,a(θK)]C=[a(θ 0 ), a(θ 1 ), a(θ 2 ), ..., a(θ K )]
式中，a是微波发射线性约束矢量；where a is the linear constraint vector of microwave emission;
微波发射矩阵约束向量为：g＝[1,0,0,…,0]The microwave emission matrix constraint vector is: g=[1,0,0,…,0]
对所述微波发射矩阵进行对角加载：RX＝CCH+σIDiagonally load the microwave emission matrix: R X =CC H +σI
式中，σ为正实数；where σ is a positive real number;
微波发射阵列中的每一个发射单元的发射参数可以通过求解下面的方程而得到：The transmit parameters of each transmit unit in the microwave transmit array can be obtained by solving the following equations:
其中，|WHa(θk)|2＝WHa(θk)a(θk)HWwhere |W H a(θ k )| 2 =W H a(θ k )a(θ k ) H W
式中，min表示最小值，W为微波发射阵列加权矢量，a是微波发射线性约束矢量，θ0为主波束指向角度，θk为干扰方向角度。In the formula, min represents the minimum value, W is the weighting vector of the microwave transmission array, a is the linear constraint vector of the microwave transmission, θ 0 is the main beam pointing angle, and θ k is the interference direction angle.
在上述任一种实施例的基础上，本实施例中基于自适应波束成形技术确定微波发射阵列中的每一个发射单元的相位、幅度信息，得到符合所述方向图的微波，具体可以进行以下步骤：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 the adaptive beamforming technology to obtain microwaves conforming to the pattern. Specifically, the following steps may be performed. step:
步骤210：设定微波发射阵列参数，包括微波发射单元个数，微波发射单元间距，微波发射频率，微波发射波束个数和角度，零陷个数和位置；Step 210: Set parameters of the microwave transmitting array, including the number of microwave transmitting units, the spacing of microwave transmitting units, the frequency of microwave transmitting, the number and angle of microwave transmitting beams, the number and position of nulls;
步骤220：根据所述微波发射频率计算该频率下实现自适应波束成形的各个微波发射单元的加权系数；Step 220: Calculate, according to the microwave transmission frequency, the weighting coefficients of each microwave transmission unit that implements adaptive beamforming at the frequency;
步骤230：在频域上，存储每一个微波阵列发射单元的加权发射系数，所述加权系数表可以利用插值算法得到，并存储在数字芯片中；Step 230: In the frequency domain, store the weighted emission coefficient of each microwave array transmitting unit, and the weighted coefficient table can be obtained by using an interpolation algorithm and stored in the digital chip;
步骤240：微波发射阵列开始工作后，随着时间的变化，根据各个微波阵列发射单元加权系数表，输出相应的加权矢量信号。Step 240: After the microwave transmitting array starts to work, with the change of time, the corresponding weighted vector signal is output according to the weighting coefficient table of each microwave array transmitting unit.
如图5，首先进行步骤1、微波发射阵列相位校准；本发明所述的一种用于微波烘干系统中的微波发射阵列的控制方法，包括一种微波发射阵列，请参阅图2，所述微波发射阵列由36个微波发射单元组成，所述36个微波发射单元排列为6×6的方阵阵列，所述36个微波发射单元由若干组有源放大电路驱动。所述36个微波发射单元中每一个微波发射单元的额定功率为1kW，所述微波发射阵列系统最大烘干功率为所有微波发射单元额定发射功率的总和，且功率可调。所述若干个微波发射单元中每一个微波发射单元的微波发射频率为2.4GHz。由于现有生产水平无法保证同型号的有源放大器件性能完全一致，经过所述若干组有源放大电路放大的电信号会发生相位、幅度偏移，造成后续步骤中，方向图的控制精度下降，影响烘干效果，降低能量利用效率。基于上述实施，需要对所述微波发射阵列进行相位校准。所述的微波阵列相位校准采用负载自适应算法实现。射频发射阵列相位校准具备自检功能，可检测相位校准是否成功，相位校准失败会影响烘干效果和能源利用效率。当检测的相位校准成功时，进入步骤2；当检测到校准失败时，需要操作人员选择进入步骤2或是进行检修。As shown in FIG. 5, step 1, phase calibration of the microwave emission array is first performed; a control method for a microwave emission array in a microwave drying system according to the present invention includes a microwave emission array, please refer to FIG. 2, the The microwave transmitting array is composed of 36 microwave transmitting units, the 36 microwave transmitting units are arranged in a 6×6 square array, and the 36 microwave transmitting units are driven by several groups of active amplifier circuits. The rated power of each microwave transmitting unit in the 36 microwave transmitting units is 1 kW, and the maximum drying power of the microwave transmitting array system is the sum of the rated transmitting power of all the microwave transmitting units, and the power is adjustable. The microwave emitting frequency of each microwave emitting unit in the plurality of microwave emitting units is 2.4 GHz. Since the current production level cannot guarantee that the performance of the active amplifier devices of the same type is completely consistent, the electrical signals amplified by the several groups of active amplifier circuits will be shifted in phase and amplitude, resulting in a decrease in the control accuracy of the pattern in the subsequent steps. , affecting the drying effect and reducing the energy utilization efficiency. Based on the above implementation, it is necessary to perform phase calibration on the microwave transmitting array. The phase calibration of the microwave array is realized by a load adaptive algorithm. The phase calibration of the RF transmitting array has a self-check function, which can detect whether the phase calibration is successful or not. The failure of the phase calibration will affect the drying effect and energy utilization efficiency. When the detected phase calibration is successful, go to step 2; when it is detected that the calibration fails, the operator needs to choose to go to step 2 or perform maintenance.
2、根据待烘干物品的外观几何参数，确定微波波束覆盖区域；2. Determine the microwave beam coverage area according to the geometric parameters of the appearance of the items to be dried;
请参阅图3，其中1是微波发射阵列，2是微波波束覆盖区域。根据待烘干物品的外观几何参数，本发明开的一种用于微波烘干系统中的微波发射阵列的控制方法可以将微波波束覆盖区域几何尺寸设定到与待烘干物品所需最小几何边沿一致，所述待烘干物品几何参数可由操作人员输入所述微波烘干系统。Please refer to Figure 3, where 1 is the microwave transmitting array, and 2 is the microwave beam coverage area. According to the geometrical parameters of the appearance of the items to be dried, a control method for a microwave emission array in a microwave drying system developed by the present invention can set the geometric size of the coverage area of the microwave beam to the minimum geometry required for the items to be dried If the edges are consistent, the geometric parameters of the items to be dried can be input into the microwave drying system by the operator.
一般的，微波波束覆盖区域设定为微波发射阵列几何中心为对角线交点，四边与微波发射阵列外边沿平行的矩形区域，具体的，输入参数为矩形的长a和宽b。Generally, the microwave beam coverage area is set as a rectangular area with the geometric center of the microwave transmitting array as the intersection of the diagonal lines, and the four sides are parallel to the outer edge of the microwave transmitting array. Specifically, the input parameters are the length a and width b of the rectangle.
3、确定微波发射阵列方向图；3. Determine the microwave launch array pattern;
根据步骤2所述的待烘干物品几何参数确定的微波波束覆盖区域，所述微波发射阵列方向图是指微波在空间中传播时的特定轨迹，所述微波只在方向图覆盖的区域存在，而在方向图未覆盖的区域不存在，通过控制微波发射阵列的方向图即可实现控制微波波束，进一步的，实现对微波能量的精确控制。According to the microwave beam coverage area determined by the geometric parameters of the item to be dried described in step 2, the microwave emission array pattern refers to the specific trajectory of the microwave when propagating in space, and the microwave exists only in the area covered by the pattern. However, in the area not covered by the pattern, the microwave beam can be controlled by controlling the pattern of the microwave transmitting array, and further, the precise control of the microwave energy can be realized.
根据几何参数矩形的长a和宽b，确定微波发射阵列加权矢量W，微波发射阵列信号协方差矩阵RX，微波发射阵列线性约束矩阵C，微波发射矩阵约束向量gAccording to the length a and width b of the geometric parameter rectangle, determine the microwave transmitting array weight vector W, the microwave transmitting array signal covariance matrix RX, the microwave transmitting array linear constraint matrix C, and the microwave transmitting matrix constraint vector g
4、根据电磁波干涉原理，采用一种自适应波束成形技术，确定微波发射阵列中的每一个发射单元的相位、幅度信息，得到步骤3中所述的微波发射阵列方向图。4. According to the principle of electromagnetic wave interference, an adaptive beamforming technology is used to determine the phase and amplitude information of each transmitting unit in the microwave transmitting array, and the microwave transmitting array pattern described in
由于本发明采用2.4GHz微波作为发射频率，在工作过程中该频率不会发生改变，因此发射微波是一种窄带信号。本发明采用窄带信号自适应滤波实现最小方差式波束成形技术。Since the present invention adopts the 2.4GHz microwave as the transmitting frequency, the frequency will not change during the working process, so the transmitting microwave is a narrow-band signal. The invention adopts the narrowband signal adaptive filtering to realize the minimum variance beamforming technology.
本发明提供的一种用于微波烘干系统中的微波发射阵列的控制方法通过根据待烘干物品的外观几何参数，确定微波发射阵列的微波波束的覆盖区域；确定微波发射阵列的微波发射阵列的方向图，从而实现精确的微波发射，烘干均匀，提高能源利用率和安全性。A method for controlling a microwave transmitting array in a microwave drying system provided by the present invention determines the coverage area of the microwave beam of the microwave transmitting array according to the appearance geometric parameters of the items to be dried; and determines the microwave transmitting array of the microwave transmitting array. The direction map, so as to achieve precise microwave emission, uniform drying, improve energy efficiency and safety.
下面对本发明提供的用于微波烘干系统中的微波发射阵列的控制装置进行描述，下文描述的用于微波烘干系统中的微波发射阵列的控制装置与上文描述的用于微波烘干系统中的微波发射阵列的控制方法可相互对应参照。The following describes the control device for the microwave emitting array in the microwave drying system provided by the present invention. The control device for the microwave emitting array in the microwave drying system described below is the same as the above-described control device for the microwave drying system. The control method of the microwave transmitting array in can refer to each other correspondingly.
请参考图6，图6为本发明实施例提供的一种用于微波烘干系统中的微波发射阵列的控制装置的组成示意图。Please refer to FIG. 6 , which is a schematic diagram of the composition of a control device for a microwave emitting array in a microwave drying system according to an embodiment of the present invention.
本发明实施例提供一种用于微波烘干系统中的微波发射阵列的控制装置600，包括：An embodiment of the present invention provides a
相位校准模块610，用于对微波发射阵列进行相位校准；a
区域确定模块620，用于根据待烘干物品的外观几何参数，确定微波发射阵列的微波波束的覆盖区域；an
方向确定模块630，用于确定微波发射阵列的微波发射阵列的方向图；a
波束成型模块640，用于基于自适应波束成形技术确定微波发射阵列中的每一个发射单元的相位、幅度信息，得到符合所述方向图的微波。The
图7示例了一种电子设备的实体结构示意图，如图7所示，该电子设备可以包括：处理器(processor)710、通信接口(Communications Interface)720、存储器(memory)730和通信总线740，其中，处理器710，通信接口720，存储器730通过通信总线740完成相互间的通信。处理器710可以调用存储器730中的逻辑指令，以执行用于微波烘干系统中的微波发射阵列的控制方法，该方法包括：对微波发射阵列进行相位校准；根据待烘干物品的外观几何参数，确定微波发射阵列的微波波束的覆盖区域；确定微波发射阵列的微波发射阵列的方向图；基于自适应波束成形技术确定微波发射阵列中的每一个发射单元的相位、幅度信息，得到符合所述方向图的微波。FIG. 7 illustrates a schematic diagram of the physical structure of an electronic device. 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
此外，上述的存储器730中的逻辑指令可以通过软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本发明的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本发明各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(ROM，Read-Only Memory)、随机存取存储器(RAM，Random Access Memory)、磁碟或者光盘等各种可以存储程序代码的介质。In addition, the above-mentioned logic instructions in the
另一方面，本发明还提供一种计算机程序产品，所述计算机程序产品包括存储在非暂态计算机可读存储介质上的计算机程序，所述计算机程序包括程序指令，当所述程序指令被计算机执行时，计算机能够执行上述各方法所提供的用于微波烘干系统中的微波发射阵列的控制方法，该方法包括：对微波发射阵列进行相位校准；根据待烘干物品的外观几何参数，确定微波发射阵列的微波波束的覆盖区域；确定微波发射阵列的微波发射阵列的方向图；基于自适应波束成形技术确定微波发射阵列中的每一个发射单元的相位、幅度信息，得到符合所述方向图的微波。In another aspect, the present invention also provides a computer program product, the computer program product comprising a computer program stored on a non-transitory computer-readable storage medium, the computer program comprising program instructions, when the program instructions are executed by a computer When executed, the computer can execute the control method for the microwave emission array in the microwave drying system provided by the above methods, the method includes: performing phase calibration on the microwave emission array; The coverage area of the microwave beam of the microwave transmitting array; the pattern of the microwave transmitting array of the microwave transmitting array is determined; the phase and amplitude information of each transmitting unit in the microwave transmitting array is determined based on the adaptive beamforming technology, and the pattern conforming to the above is obtained microwave.
又一方面，本发明还提供一种非暂态计算机可读存储介质，其上存储有计算机程序，该计算机程序被处理器执行时实现以执行上述各提供的用于微波烘干系统中的微波发射阵列的控制方法，该方法包括：对微波发射阵列进行相位校准；根据待烘干物品的外观几何参数，确定微波发射阵列的微波波束的覆盖区域；确定微波发射阵列的微波发射阵列的方向图；基于自适应波束成形技术确定微波发射阵列中的每一个发射单元的相位、幅度信息，得到符合所述方向图的微波。In yet another aspect, the present invention also provides a non-transitory computer-readable storage medium on which a computer program is stored, and the computer program is implemented when executed by a processor to execute the above-mentioned microwave drying systems for microwave drying systems. A control method for a transmitting array, the method comprising: performing 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 items to be dried; determining the direction diagram of the microwave transmitting array of the microwave transmitting array ; Determine the phase and amplitude information of each transmitting unit in the microwave transmitting array based on the adaptive beamforming technology, and obtain microwaves that conform to the pattern.
以上所描述的装置实施例仅仅是示意性的，其中所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部模块来实现本实施例方案的目的。本领域普通技术人员在不付出创造性的劳动的情况下，即可以理解并实施。The device embodiments described above are only illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in One place, or it can be distributed over multiple network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution in this embodiment. Those of ordinary skill in the art can understand and implement it without creative effort.
通过以上的实施方式的描述，本领域的技术人员可以清楚地了解到各实施方式可借助软件加必需的通用硬件平台的方式来实现，当然也可以通过硬件。基于这样的理解，上述技术方案本质上或者说对现有技术做出贡献的部分可以以软件产品的形式体现出来，该计算机软件产品可以存储在计算机可读存储介质中，如ROM/RAM、磁碟、光盘等，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行各个实施例或者实施例的某些部分所述的方法。From the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and certainly can also be implemented by hardware. Based on this understanding, the above-mentioned technical solutions can be embodied in the form of software products in essence or the parts that make contributions to the prior art, and the computer software products can be stored in computer-readable storage media, such as ROM/RAM, magnetic A disc, an optical disc, etc., includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform the methods described in various embodiments or some parts of the embodiments.
最后应说明的是：以上实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的精神和范围。Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that it can still be The technical solutions described in the foregoing embodiments are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.
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