CN118174041B - Mechanically dynamically adjustable electromagnetic wave reflective surface unit and array reflective surface - Google Patents
Mechanically dynamically adjustable electromagnetic wave reflective surface unit and array reflective surface Download PDFInfo
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- H—ELECTRICITY
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Abstract
本发明公开了一种机械动态可调的电磁波反射面单元及阵列式反射面，属于无线通信领域。该反射面单元包括外框、内框、反射片、外舵机、内舵机、外齿轮组和内齿轮组；外舵机与外齿轮连接，用于驱动内框旋转，内框的旋转会带动反射片转动；内舵机与内齿轮连接，用于驱动反射片转动；外舵机与内舵机的运动互不干涉，使得反射片具有两个自由度的旋转能力，即：绕着水平、竖直两个互相垂直的轴心转动。若干反射面单元通过外框向四周紧密排列，构成阵列式反射面。通过调控多个反射面单元的角度，改变电磁波的反射方向、投影轨迹等，用非电路结构实现了传统电路结构天线阵列的效果，降低了电磁波调控成本。
The present invention discloses a mechanically dynamically adjustable electromagnetic wave reflecting surface unit and an array-type reflecting surface, which belong to the field of wireless communication. The reflecting surface unit includes an outer frame, an inner frame, a reflecting sheet, an outer steering gear, an inner steering gear, an outer gear set and an inner gear set; the outer steering gear is connected to the outer gear, which is used to drive the inner frame to rotate, and the rotation of the inner frame will drive the reflecting sheet to rotate; the inner steering gear is connected to the inner gear, which is used to drive the reflecting sheet to rotate; the movements of the outer steering gear and the inner steering gear do not interfere with each other, so that the reflecting sheet has two degrees of freedom of rotation, namely: rotating around two mutually perpendicular axes of horizontal and vertical. A plurality of reflecting surface units are closely arranged around the outer frame to form an array-type reflecting surface. By adjusting the angles of multiple reflecting surface units, the reflection direction and projection trajectory of electromagnetic waves are changed, and the effect of the antenna array of the traditional circuit structure is achieved with a non-circuit structure, reducing the cost of electromagnetic wave regulation.
Description
Technical Field
The invention belongs to the field of radio frequency control of wireless communication, and relates to a mechanically and dynamically adjustable electromagnetic wave reflecting surface unit and an array reflecting surface.
Background
In the field of 6G wireless communication, the shielding of wireless signals has been a big bottleneck. To solve this problem, directional reflection of electromagnetic waves can be achieved by designing the reflecting surface so that the wireless signal bypasses the obstacle. The existing intelligent reflecting surface enables electromagnetic waves to be reflected to a specific direction by adjusting different states of the reflecting unit. However, the scheme has high cost, low adjustment speed and large fluctuation of communication rate, and is difficult to support the communication of the user side moving fast. Therefore, the invention designs the electromagnetic wave reflecting surface with adjustable mechanical dynamic state, which does not need to use a circuit structure, greatly reduces the cost, and can dynamically regulate and control the electromagnetic wave to cover the electromagnetic wave on a specific direction and track.
Disclosure of Invention
Aiming at the defects of serious 6G wireless signal shielding, high cost, low adjustment speed and large fluctuation of communication speed of the existing intelligent reflecting surface scheme, the invention designs a mechanically and dynamically adjustable electromagnetic wave reflecting surface unit and an array reflecting surface.
The invention aims at realizing the following technical scheme:
According to the first aspect of the specification, the electromagnetic wave reflecting surface unit with the adjustable mechanical dynamic performance comprises an outer frame, an inner frame, reflecting sheets, an outer steering engine, an inner steering engine, an outer gear set and an inner gear set, wherein the outer gear set comprises a first outer gear and a second outer gear, the inner gear set comprises a first inner gear and a second inner gear, the outer frame is of a rectangular ring frame structure, one side edge of the outer frame is fixed with the first outer gear, the inner frame is of a rectangular ring frame structure, a support for fixing the outer steering engine is respectively led out from the top edge and the bottom edge of the inner frame, the first inner gear is respectively fixed inside the top edge, the outer edges of the inner frame are connected inside the two side edges of the outer frame through bearings, the top edge and the bottom edge of the reflecting sheets are respectively connected inside the top edge and the bottom edge of the inner frame through bearings, the back surface of the reflecting sheets is led out of the support for fixing the inner steering engine, the outer steering engine is connected with the second outer gear, the second outer gear is meshed with the first outer gear, the inner steering engine is connected with the second inner gear, and the second inner steering engine is meshed with the first inner gear.
Further, the outer frame is fixed in position, when the outer steering engine works, the second outer gear is driven to rotate, the first outer gear is fixed in position, the outer steering engine is fixed on the support of the inner frame, accordingly, the inner frame is driven to rotate in a pitching mode, the reflector plate is driven to rotate in a pitching mode in a synchronous pitching mode through the pitching rotation of the inner frame, when the inner steering engine works, the second inner gear is driven to rotate, and the reflector plate is driven to rotate in a yawing mode through the fact that the first inner gear is fixed in position, the inner steering engine is fixed on the back support of the reflector plate.
Further, the motion of the outer steering engine and the motion of the inner steering engine are not interfered with each other, so that the reflecting sheet has the rotation capability of two degrees of freedom, namely, the reflecting sheet rotates around two axes which are horizontal and vertical and are mutually vertical.
The method comprises the steps of connecting an inner frame with an outer frame, connecting the inner frame with a reflecting sheet, and connecting the inner frame with the reflecting sheet by adopting an interference fit mode, wherein the outer frame, the inner frame, the reflecting sheet and a gear are processed by adopting a 3D printing or compound mode, the material is weak electric conductivity and comprises polylactic acid, acrylic acid and resin, and a strong electric conductivity coating with electromagnetic wave reflecting capability is added on the surface of the reflecting sheet, and the realization modes comprise aluminum foil pasting and electroplating.
According to a second aspect of the present disclosure, a mechanically and dynamically adjustable electromagnetic wave reflecting surface is provided, where a plurality of reflecting surface units according to the first aspect are closely arranged around in an array form through an outer frame, and the size, structure, and control manner of each reflecting surface unit are consistent.
Further, the electromagnetic wave reflecting surface projects the electromagnetic wave onto a special track of the electromagnetic wave projection area, specifically:
The electromagnetic wave reflecting surface with adjustable mechanical dynamic comprises M r×Nr reflecting surface units, the electromagnetic wave projection area comprises M p×Np grids, and the special track comprises N t grids, wherein N t＜Mr×Nr; the electromagnetic wave projection area is a minimum rectangular area containing the special track;
each projection track grid corresponds to n reflecting surface units, Wherein the method comprises the steps ofRepresenting a downward rounding, wherein N t ×n reflector units are mapped with the projection track grid;
For each of the remaining M r×Nr-Nt x n reflector units, its corresponding projected track grid should be such that Minimization of the process, whereinRepresenting variance over different projection trajectory grids i,For the received power from reflector unit i j to projected trace grid i, reflector unit i j represents that the reflector unit is the jth reflector unit mapped to projected trace grid i, and is selected one by one for each of the remaining M r×Nr-Nt n reflector units such thatThe minimized projected trace grid, thereby completing the mapping of all reflector units, i.e. all reflectors, to the electromagnetic wave projected trace grid.
Further, the access point is used as a transmitter, the millimeter waves transmitted by the transmitter reach the projection track after being reflected by the reflecting surface and then are received by a receiver on the projection track, and for any point Q i on the projection track, when the reflecting surface is used for eliminating the shielding of an obstacle, the power P r(Qi) received by the track point Q i is expressed as:
Wherein P t is the power of millimeter waves emitted by the access point, G t is the millimeter wave antenna gain of the access point, G r is the millimeter wave antenna gain of the receiver, d AR,i is the distance from the access point to the center of the reflecting surface, d RP,i is the distance from the center of the reflecting surface to the track point Q i, sigma i is the radar scattering sectional area corresponding to the reflecting surface, the distance between the access point and the track point Q i is represented as d AP,i, the included angle between the center of the access point-reflecting surface and the access point-track point Q i is represented as alpha RP,i, the included angle between the access point-track point Q i and the center of the reflecting surface-track point Q i is represented as alpha AR, i, and the power P r(Qi received by the track point Q i is represented as follows according to the geometric relation:
Wherein σ max represents the maximum value of radar scattering cross section corresponding to the reflecting surface, η i represents millimeter wave reflection gain introduced by the reflecting surface, and the formula is as follows:
For the track point Q i, in order to find the optimal reflective surface deployment position and orientation on the whole track, the optimization target is set to make the power P r(Qi) received by the track point Q i maximum, and the optimization problem is written as follows:
subject to:αAR,i∈[αAR,min,αAR,max],αRP,i∈[αRP,min,αRP,max]
Wherein [ alpha AR,min,αAR,max ] represents an alpha AR,i range corresponding to the reflecting surface when the millimeter wave bypasses the obstacle, and [ alpha RP,min,αRP,max ] represents an alpha RP,i range corresponding to the reflecting surface when the millimeter wave bypasses the obstacle;
And respectively obtaining the optimal deployment position and orientation of the reflecting surface for different points Q i, taking the centroids of the positions of the different reflecting surfaces as the actual deployment positions of the reflecting surfaces, and obtaining the actual deployment orientation of the reflecting surfaces due to the mutual coupling of the positions and orientations of the reflecting surfaces.
Further, the size of the reflecting surface units depends on the Rayleigh roughness criterion, and in order to enable each reflecting surface unit to have accurate regulation and control capability, the roughness height difference h of the whole reflecting surface needs to be ensured to meet h > lambda/8, wherein lambda is the wavelength of electromagnetic waves.
Further, according to the multi-beam synthesis algorithm, the reflection direction and the projection track of the electromagnetic wave are changed by adjusting and controlling the angles of a plurality of reflecting surface units, specifically:
For any one reflecting surface unit, the four vertex angles of the reflecting surface unit are sequentially and clockwise connected and marked as ABDC, and the normal vector of the plane corresponding to the reflecting surface unit is regulated to a vector N, wherein the vector N is obtained by geometric relations through the positions of an access point, the reflecting surface unit and a projection point;
For triangle ABC, taking a as the origin of coordinates of the reflecting surface unit, the position of fixed point a, and the horizontal position of fixed point B, C, adjusting the normal vector of triangle ABC to vector N by adjusting the height of point B, C, and solving the following equation to obtain the height of point B, C:
for triangle BDC, knowing the position of point B, C, the horizontal position of fixed point D, the normal vector of triangle BDC is adjusted to vector N by adjusting the height of point B, C, and the height of point D can be found by solving the following equation:
and obtaining normal vectors of all reflecting surface units of the electromagnetic wave reflecting surface, thereby completing angle regulation and control of the whole reflecting surface.
The electromagnetic wave reflecting surface further comprises a wireless control system, wherein the wireless control system comprises a wireless communication module, an upper computer, a microcontroller and a reflecting surface control bus, the wireless communication module acquires positioning information of a track to be projected from the upper computer according to a set sampling rate and then transmits the positioning information to the microcontroller, and the microcontroller converts the positioning information into control signals of each reflecting surface unit according to a geometric relation and a adopted multi-beam synthesis algorithm and then transmits the control signals to an outer steering engine and an inner steering engine of each reflecting surface unit through the reflecting surface control bus.
The electromagnetic wave reflecting surface unit with the adjustable mechanical dynamic state has the beneficial effects that the electromagnetic wave reflecting surface unit with the adjustable mechanical dynamic state comprises an outer frame, an inner frame, a reflecting sheet, an outer steering engine, an inner steering engine, an outer gear set and an inner gear set, wherein the outer steering engine is connected with the outer frame and used for driving the inner frame to rotate, the inner frame rotates to drive the reflecting sheet to rotate, the inner steering engine is connected with the inner gear and used for driving the reflecting sheet to rotate, and the movements of the outer steering engine and the inner steering engine do not interfere with each other, so that the reflecting sheet has the rotating capability of two degrees of freedom, namely, the reflecting sheet rotates around two mutually vertical axes. The reflecting surface units are closely arranged around through the outer frame to form an array reflecting surface. By regulating and controlling the angles of the reflecting surface units, the reflecting direction, the projection track and the like of electromagnetic waves are changed, the effect of the antenna array with the traditional circuit structure is realized by using a non-circuit structure, and the electromagnetic wave regulating and controlling cost is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that 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 an exemplary embodiment of the present invention at a first viewing angle;
FIG. 2 is a schematic diagram of the structure of an exemplary embodiment of the present invention at a second viewing angle;
FIG. 3 is a schematic diagram of the structure of an exemplary embodiment of the present invention at a third perspective;
fig. 4 is a schematic view of an external gear structure used in an external steering engine according to an exemplary embodiment of the present invention;
FIG. 5 is a schematic view of an internal gear used in an internal steering engine according to an exemplary embodiment of the present invention;
FIG. 6 is a schematic view of the structure of an outer frame in an exemplary embodiment of the invention;
fig. 7 is a schematic view showing the structure of an inner frame in an exemplary embodiment of the present invention;
fig. 8 is a schematic view showing the structure of a reflection sheet in an exemplary embodiment of the present invention;
fig. 9 is a schematic diagram of a structure of a reflection surface unit array in an exemplary embodiment of the present invention;
FIG. 10 is a graph of reflector power and deployment position orientation model in an exemplary embodiment of the invention;
fig. 11 is a schematic diagram of millimeter wave reflection gain in an exemplary embodiment of the invention;
FIG. 12 is a schematic view of the angular adjustment of a reflector unit in an exemplary embodiment of the invention;
fig. 13 is a schematic diagram of a wireless control system according to an exemplary embodiment of the present invention;
in the figure, 1-outer frame, 2-inner frame, 3-reflector plate, 4-outer steering engine, 5-inner steering engine, 6-outer gear, 7-inner gear, 8-reflecting surface control bus, 9-microcontroller, 10-wireless communication module and 11-upper computer.
Detailed Description
For a better understanding of the technical solution of the present application, the following detailed description of the embodiments of the present application refers to the accompanying drawings.
It should be understood that the described embodiments are merely some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
As shown in fig. 1, 2 and 3, the embodiment of the invention provides a mechanically and dynamically adjustable electromagnetic wave reflecting surface unit, which comprises an outer frame 1, an inner frame 2, a reflecting sheet 3, an outer steering engine 4, an inner steering engine 5, an outer gear set 6, an inner gear set 7, a bearing and other components. The gear structure of the external gear set 6 is shown with reference to fig. 4, the structure of the internal gear 7 is shown with reference to fig. 5, the structure of the external frame 1 is shown with reference to fig. 6, the structure of the internal frame 2 is shown with reference to fig. 7, and the structure of the reflection sheet 3 is shown with reference to fig. 8.
The external gear set 6 includes a first external gear and a second external gear. The internal gear set 7 includes a first internal gear and a second internal gear. The outer frame 1 is a rectangular ring frame structure, and one side edge of the outer frame is fixed with a first external gear. The inner frame 2 is of a rectangular ring frame structure, brackets for fixing the outer steering engine 4 are respectively led out from the top edge and the bottom edge of the inner frame, and a first inner gear is fixed in the top edge of the inner frame. The outer parts of the two sides of the inner frame 2 are connected with the inner parts of the two sides of the outer frame 1 through bearings. The top edge and the bottom edge of the reflecting sheet 3 are respectively connected with the inside of the top edge and the bottom edge of the inner frame 2 through bearings, and a bracket for fixing the inner steering engine 5 is led out from the back surface of the reflecting sheet 3. The outer steering engine 4 is connected with a second outer gear, and the second outer gear is meshed with the first outer gear. The internal steering engine 5 is connected with a second internal gear, and the second internal gear is meshed with the first internal gear.
The frame 1 fixed in position drives the second external gear to rotate when the external steering engine 4 works, and the first external gear is fixed in position and the external steering engine 4 is fixed on the support of the inner frame 2, so that the inner frame 2 is driven to rotate in a pitching mode, and the reflector plate 3 is driven to rotate in a pitching mode synchronously. When the internal steering engine 5 works, the second internal gear is driven to rotate, and the first internal gear is fixed in position and the internal steering engine 5 is fixed on the back support of the reflector plate 3, so that the reflector plate 3 is driven to yaw and rotate.
Further, the connection between the outer steering engine 4 and the second outer gear can be a plurality of connection ways such as gluing, the connection between the inner steering engine 5 and the second inner gear can be a plurality of connection ways such as gluing, and the movement of the outer steering engine 4 and the movement of the inner steering engine 5 are not interfered with each other, so that the reflecting sheet 3 has the rotation capability of two degrees of freedom, namely, the reflecting sheet rotates around two axes which are vertical and horizontal.
Further, the bearing connection of the inner frame 2 and the outer frame 1 and the bearing connection of the inner frame 2 and the reflecting sheet 3 are realized in an interference fit mode.
Further, the processing modes of the outer frame 1, the inner frame 2, the reflecting sheet 3, the gears and other parts can be realized by using various modes such as 3D printing, complex die and the like, the materials are weak electric conductivity and comprise polylactic acid, acrylic acid, resin and the like, and in order to enable the reflecting sheet 3 to have electromagnetic wave reflecting capability, a coating with strong electric conductivity needs to be added on the surface, and the realization modes comprise aluminum foil pasting, electroplating and the like.
Further, in order to reduce the system cost and ensure the accuracy of electromagnetic wave regulation, the inner steering engine 5 and the outer steering engine 4 are controlled by PWM signals. The model of the internal steering engine and the model of the external steering engine adopted in the embodiment are SG90 g steering engines, the rotating range of the steering engines is 180 degrees, the position grade is 1024, the angular resolution is 180 degrees/1024= 0.1758 degrees, and the precision control requirement of electromagnetic wave regulation and control is met.
Referring to fig. 9, a plurality of mechanically and dynamically adjustable electromagnetic wave reflecting surface units may be closely arranged around by an outer frame to form an array form, so as to form an integral reflecting surface. The electromagnetic wave reflecting surface units with adjustable mechanical dynamics can be closely arranged around by the outer frame in various connecting ways such as gluing, binding, screw fixing and the like, and the size, the structure and the control mode of each electromagnetic wave reflecting surface unit with adjustable mechanical dynamics are consistent.
Further, the mechanically dynamically adjustable electromagnetic wave reflecting surface may project an electromagnetic wave onto a special track of the electromagnetic wave projection area, specifically, the mechanically dynamically adjustable electromagnetic wave reflecting surface contains M r×Nr reflecting surface units, the electromagnetic wave projection area contains M p×Np grids, and the special track contains N t grids, wherein N t＜Mr×Nr. The electromagnetic wave projection area is the smallest rectangular area containing a special trajectory, which is uniformly discretized into M p×Np grids, M pNp≤MrNr.
Further, considering the defect of millimeter wave attenuation, the electromagnetic wave projection mode depends on a power average algorithm, so that the electromagnetic wave intensity on a target electromagnetic wave projection track is more uniform, and the beam scanning delay caused by the change of the signal intensity in the wireless communication process is reduced. Specifically, each projected trajectory grid is made to correspond to n reflector units, where n is defined as follows:
Wherein, The representation is rounded down, at which time the mapping of N t N reflector units to the projected trajectory grid has been completed.
According to Friss electromagnetic wave free space propagation theorem, there are:
Wherein, For the transmit power from the reflector element i j to the projected track grid i,For the received power from the reflector unit i j to the projected track grid i,For the transmit antenna gain from the reflector element i j to the projected track grid i,For the receive antenna gain from reflector element i j to projected trace grid i, reflector element i j represents that the reflector element is the j-th reflector element mapped to projected trace grid i, lambda is the electromagnetic wave wavelength,Is the distance from the mirror element i j to the projected track grid i. Different electromagnetic waves arriving at the projected trajectory grid i from the reflecting surface unit i j due to propagation pathsDifferent received power from the reflector element i j to the projected trajectory grid iAnd also different. Although n reflector units are equally allocated for each projected trace grid, the received power of each projected trace grid is different. In order to make the total electromagnetic wave power at the projected trajectory grid i the same, the following condition is satisfied:
Wherein, Representing variance over different projection trajectory grids i. In order to achieve the above conditions, a reflector unit power distribution algorithm is designed, specifically, for each reflector unit in the remaining M r×Nr-Nt ×n reflector units, the corresponding projection track grid should be such thatMinimizing and based thereon selecting each of the remaining M r×Nr-Nt x n reflector units one by one such thatA minimized projected trajectory grid. Thereby completing the mapping from all the reflecting surface units, namely all the reflecting sheets, to the electromagnetic wave projection track grid.
Further, the access point serves as a transmitter, and millimeter waves transmitted by the transmitter reach the projection track after being reflected by the reflecting surface, and are further received by a receiver on the projection track. Fig. 10 is a graph of the reflected surface power and the deployment position orientation model, for any point Q i on the projected trajectory, when the reflected surface is used to clear the obstruction, the power P r(Qi received by point Q i) can be expressed as:
Wherein, P t is the power of millimeter wave emitted by the access point, G t is the millimeter wave antenna gain of the access point, G r is the millimeter wave antenna gain of the receiver, d AR,i is the distance from the access point to the center of the reflecting surface, d RP,i is the distance from the center of the reflecting surface to the track point Q i, and σ i is the radar scattering cross-sectional area RCS corresponding to the reflecting surface. Further, the distance between the access point and the track point Q i is denoted as d AP,i, the angle between the center of the access point-reflective surface and the access point-track point Q i is denoted as α RP,i, the angle between the access point-track point Q i and the center of the reflective surface-track point Q i is denoted as α AR,i, and then, according to the geometric relationship, the power P r(Qi received by the track point Q i) may be expressed as:
Wherein, The reflection gain of millimeter waves introduced by the reflecting surface is represented, specifically, the numerator represents glancing incidence loss introduced by different orientations of the reflecting surface, the denominator represents path loss introduced by different positions of the reflecting surface, and sigma max represents the maximum value of radar scattering cross section RCS corresponding to the reflecting surface. For point Q i on the projected trajectory, in order to find the optimal reflector deployment position, orientation over the entire trajectory, the optimization objective may be set to maximize the power P r(Qi received by trajectory point Q i). The optimization problem can therefore be written in the form:
subject to:αAR,i∈[αAR,min,αAR,max],αRP,i∈[αRP,min,αRP,max]
Wherein, [ alpha AR,min,αAR,max ] represents an alpha AR,i range corresponding to the reflecting surface when the millimeter wave can bypass the obstacle, and [ alpha RP,min,αRP,max ] represents an alpha RP,i range corresponding to the reflecting surface when the millimeter wave can bypass the obstacle. The optimization problem can be solved through optimization algorithms such as random gradient descent and greedy algorithm, and the obtained optimal solution comprises the position and the orientation of the reflecting surface.
When d AP,i =5m, the relationship between the millimeter wave reflection gain introduced by the reflection surface and α AR,i、αRP,i is as shown in fig. 11, and the optimum α AR,i and α RP,i for maximizing the millimeter wave reflection gain can be intuitively searched. Specifically, when the value of α AR,i is large, the value of α RP,i is small (corresponding to the reflection surface being close to the receiver), or when the value of α AR,i is small and the value of α RP,i is large (corresponding to the reflection surface being close to the access point), the millimeter wave reflection gain is larger. In order to obtain the optimal deployment position and orientation of the reflecting surface of a special track, the whole projection track needs to be discretized, namely, the projection track is expressed as different points Q i, then, the optimal deployment position and orientation of the reflecting surface are respectively obtained for the different points Q i, finally, the mass centers of the positions of the different reflecting surfaces are taken as the actual deployment positions of the reflecting surfaces, and the positions and orientations of the reflecting surfaces are mutually coupled, so that the actual deployment orientation of the reflecting surface can be directly obtained.
Further, the size of the mechanically dynamically adjustable electromagnetic wave reflecting surface unit depends on the Rayleigh roughness criterion. In order to enable each mechanically and dynamically adjustable electromagnetic wave reflecting surface unit to have accurate regulation capability, it is required to ensure that the roughness height difference h of the whole reflecting surface satisfies h > lambda/(8 cos theta), wherein lambda is the wavelength of electromagnetic waves, and theta is the incident angle of the electromagnetic waves. In order to obtain the lower limit of the roughness height difference h of the whole reflecting surface, h is ensured to be more than lambda/8. In order to describe the roughness height difference h of the whole reflecting surface, the roughness height differences in the horizontal direction and the vertical direction are respectively defined in the horizontal direction and the vertical direction
Wherein h i′,j represents the height of the vertex of the right lower angle of the electromagnetic wave reflecting surface unit with the mechanical dynamic adjustable ith row and jth column.
Furthermore, according to the multi-beam synthesis algorithm, the reflection direction, the projection track and the like of electromagnetic waves can be changed by adjusting and controlling the angles of a plurality of reflecting surface units, and the effect of the antenna array with the traditional circuit structure is realized by using a non-circuit structure. FIG. 12 is a schematic view of the angle adjustment of the reflecting surface unit according to the embodiment of the present invention. The angle control of each mechanically and dynamically adjustable electromagnetic wave reflecting surface unit is obtained through the geometric relationship of the incident electromagnetic wave, each mechanically and dynamically adjustable electromagnetic wave reflecting surface unit and the emergent electromagnetic wave. For any electromagnetic wave reflecting surface unit with adjustable mechanical dynamic, four vertex angles of the reflecting surface unit are sequentially and clockwise connected and marked as ABDC, the normal vector of the plane corresponding to the reflecting surface unit is adjusted to be a vector N, and the vector N can be obtained through the positions of an access point, the reflecting surface unit and a projection point by geometric relations. For triangle ABC therein, a is taken as the origin of coordinates of the reflector unit, the location of the fixed point a, the horizontal location of the fixed point B, C, the normal vector of triangle ABC is adjusted to vector N by adjusting the height of point B, C. The height of point B, C can be found by solving the following equation:
Similarly, for triangle BDC therein, the position of point B, C, the horizontal position of fixed point D, is known, and the normal vector of triangle BDC is adjusted to vector N by adjusting the height of point B, C. The height of the point D can be obtained by solving the following equation:
and by analogy, the normal vectors of all the reflecting surface units of the reflecting surface can be obtained, so that the angle regulation and control of the whole reflecting surface can be finished.
Further, fig. 13 is a schematic structural diagram of a wireless control system according to an embodiment of the present invention. In order to realize the control of the reflecting surface by using a hardware circuit, a wireless communication module 10 is adopted to acquire positioning information of a track to be projected from an upper computer 11 according to a certain sampling rate, then the positioning information is transmitted to a microcontroller 9, the microcontroller 9 converts the positioning information into control signals of each mechanically adjustable electromagnetic wave reflecting surface unit according to a geometric relation and a multi-beam synthesis algorithm adopted, and then the microcontroller 9 transmits the generated control signals to an outer steering engine 4 and an inner steering engine 5 of each mechanically adjustable electromagnetic wave reflecting surface unit by a reflecting surface control bus 8.
Further, the wireless communication module 10 preferably uses low-frequency electromagnetic waves with good stability and strong penetrating power, including but not limited to WiFi, bluetooth, 4G, and the like, and the positioning information of the track to be projected obtained from the host computer 11 may use various positioning methods, including but not limited to GPS positioning, loRa positioning, wiFi CSI assistance positioning, side channel information positioning, and the like.
The foregoing description of the preferred embodiment(s) is (are) merely intended to illustrate the embodiment(s) of the present invention, and it is not intended to limit the embodiment(s) of the present invention to the particular embodiment(s) described.
Claims (9)
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