Metasurface for indoor positioning GPS relay and metasurface control method

Abstract

The application provides an ultracstructure for indoor positioning GPS relay and an ultracstructure control method, the ultracstructure comprises a plurality of ultracstructure units; the ultracstructure unit comprises sequentially arranged incident surface layers, first shielding layers, intermediate layers, second shielding layers and emergent surface layers; the incident surface layers and the emergent surface layers comprise ITO films, the ITO films are provided with two rectangular openings with equal lengths and parallel to each other, the two rectangular openings are arranged close to two side edges of the ITO films in the length direction respectively, the ITO film is provided with a communication opening communicating the two rectangular openings, the communication opening is perpendicular to the two rectangular openings and extends from one end of one rectangular opening to the other rectangular opening; a printed circuit for connecting feeding is arranged between the second shielding layer and the intermediate layer. The two rectangular openings and the communication opening form an asymmetric U-shaped structure, two kinds of orthogonal mode signals required by circularly polarized signals are provided, and the transmission efficiency for the circularly polarized signals is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of indoor positioning technology, and in particular to a metasurface for indoor positioning GPS relay and a metasurface control method. BACKGROUND

[0002] Global Positioning System (GPS), also known as Global Satellite Positioning System, is a medium-orbit satellite navigation system. It can provide accurate positioning, speed measurement and high-precision standard time for most areas on the earth's surface. Global Positioning System can meet the needs of users at any place on the earth or near space to continuously and accurately determine three-dimensional position, three-dimensional motion and time. The system includes 31 GPS artificial satellites in space, 1 master control station, 3 data injection stations and 5 monitoring stations on the ground, and GPS receivers, smart phones and the like as user terminals. A minimum of only four satellites can quickly determine the position and altitude of the user terminal on the earth; the more satellite signals that can be received, the more accurate the decoded position. At the same time, because it is a time difference positioning, it can also accurately correct the time stamp. GPS system has the following advantages: using low-frequency signals, even in bad weather, the signal penetration remains relatively high; global coverage of up to 98%; high-precision three-dimensional speed and time; fast, time-saving and efficient; widely used and multi-functional; mobile positioning. Due to high availability and universality, most navigation and synchronization applications are completed using GPS.

[0003] For indoor positioning, a repeater for transmitting information between the satellite and the user terminal needs to be installed, and indoor positioning is completed through the repeater. The existing repeater often has poor transmission efficiency. SUMMARY

[0004] In view of this, the embodiments of the present application provide a metasurface for indoor positioning GPS relay to eliminate or improve one or more defects in the prior art.

[0005] One aspect of the present application provides a metasurface for indoor positioning GPS relay, the metasurface for indoor positioning GPS relay comprising a plurality of metasurface units;

[0006] The metasurface unit comprises an incident surface layer, a first shielding layer, an intermediate layer, a second shielding layer and an exit surface layer arranged in sequence;

[0007] The incident surface layer and the exit surface layer include an ITO film. Each ITO film has two rectangular openings of equal length, which are arranged in parallel. The two rectangular openings are respectively located close to two sides of the ITO film in the length direction. The ITO film has a connecting opening that connects the two rectangular openings. The connecting opening is perpendicular to the two rectangular openings and extends from one end of one rectangular opening to the other rectangular opening.

[0008] A printed circuit for connecting the power supply is provided between the second shielding layer and the intermediate layer.

[0009] Using the above scheme, two rectangular openings and a connecting opening are provided in both the incident and exit surface layers. These two rectangular openings and the connecting opening form an asymmetrical U-shaped structure, providing two different paths for the surface current passing through the structure. Figure 7 As shown, this unit structure provides two orthogonal signal modes required for circularly polarized signals, improving transmission efficiency. The welded diodes control the current flow, thus controlling the opening direction of the U-shaped structure. Two different opening directions allow for phase adjustment of the signal to 0 or π; if the opening directions are the same, the phase remains unchanged, while if the opening directions are opposite, a phase flip occurs due to the opposite orientation of the structure and the metasurface. This layer is connected to the front structure via a central silver-filled hole, enabling signal transmission. The upper and lower silver-filled holes control the switching of the diodes. After the unit can achieve 0 or π phase adjustment, controlling the feeding of different units can create a spatial phase difference, allowing for the superposition of the emitted signal in the target direction, enhancing signal strength—i.e., beamforming.

[0010] In some embodiments of the present invention, in the projection direction of the incident surface layer of the metasurface unit, the two rectangular openings of the incident surface layer and the exit surface layer coincide.

[0011] In some embodiments of the present invention, the incident surface layer includes a communicating opening that extends from one end of a lower rectangular opening away from the side of the ITO film to another rectangular opening; the exit surface layer includes two communicating openings that each extends from one end of one of the two rectangular openings away from the side of the ITO film to another rectangular opening.

[0012] In some embodiments of the present invention, the metasurface unit includes a first conductive line and a second conductive line. One end of the first conductive line is connected to the ITO film of the incident surface layer and extends perpendicularly to the incident surface layer to the intermediate layer. One end of the second conductive line is connected to the ITO film of the exit surface layer and extends perpendicularly to the exit surface layer to the intermediate layer and is connected to the printed circuit.

[0013] In some embodiments of the present application, the printed circuit includes two metal plates and a metal wire connecting the two metal plates, the two metal plates are arranged in parallel, and at the middle position of the length direction of the two metal plates, they are connected with the two second conducting wires respectively.

[0014] In some embodiments of the present application, the super-structured surface unit further includes a third conducting wire, one end of the third conducting wire is connected with the incident surface layer at the barycenter position of the ITO film, and the other end extends vertically to the ITO film of the exit surface layer and is connected with the barycenter position of the ITO film of the exit surface layer.

[0015] In some embodiments of the present application, the first shielding layer, the intermediate layer and the second shielding layer all adopt PET substrate material.

[0016] In some embodiments of the present application, the cross-sectional areas of the first shielding layer, the intermediate layer and the second shielding layer are equal, the cross-sectional areas of the incident surface layer and the exit surface layer are equal, and the cross-sectional areas of the first shielding layer, the intermediate layer and the second shielding layer are greater than the cross-sectional areas of the incident surface layer and the exit surface layer.

[0017] In some embodiments of the present application, the super-structured surface for indoor positioning GPS relay is obtained by splicing a plurality of super-structured surface units, a printed circuit for connecting each super-structured surface unit is adopted in the super-structured surface and extends to the edge of the super-structured surface for connecting a power supply, and by whether the power supply of the super-structured surface unit is turned on or not, the phase of the super-structured surface unit is determined as 0 or π.

[0018] In the specific implementation process, in the direction of the orthographic projection of the incident surface layer of the super-structured surface unit, each super-structured surface unit is a square with equal side length, and the side length is d.

[0019] A super-structured surface control method, the steps of the method include:

[0020] Obtaining the signal incoming direction and the target transmission direction of the super-structured surface, determining the pitch angle and the direction angle of the signal incoming direction based on the signal incoming direction, and determining the pitch angle and the direction angle of the target transmission direction based on the target transmission direction;

[0021] Calculating the incident phase of each super-structured surface unit in the super-structured surface based on the pitch angle and the direction angle of the signal incoming direction, and calculating the exit phase of each super-structured surface unit in the super-structured surface based on the pitch angle and the direction angle of the target transmission direction;

[0022] Calculating the phase adjustment value based on the incident phase and the exit phase of each super-structured surface unit, and determining that the phase of the corresponding super-structured surface unit is adjusted to 0 or π based on the phase adjustment value.

[0023] By adopting the scheme, the scheme can realize directional transmission of a target direction based on the above-mentioned indoor positioning GPS relay metasurface structure, can better provide determination of positioning information for an indoor environment, improve processing precision, and guarantee transmission effect of a corresponding direction.

[0024] In some embodiments of the present application, in the step of calculating the incident phase of each metasurface unit in the metasurface based on the elevation angle and the azimuth angle of the signal incoming direction and calculating the outgoing phase of each metasurface unit in the metasurface based on the elevation angle and the azimuth angle of the target transmission direction, the incident phase and the outgoing phase are calculated by using the following formula:

[0025]

[0026] wherein, represents the incident phase of the metasurface unit in the mth row and the nth column in the metasurface, represents the outgoing phase of the metasurface unit in the mth row and the nth column in the metasurface, d is the side length of the metasurface unit, λ is the wavelength of the GPS signal, the elevation angle and the azimuth angle of the signal incoming direction are θ inc and the elevation angle and the azimuth angle of the target transmission direction are θ des and

[0027] In some embodiments of the present application, in the step of calculating the phase adjustment value based on the incident phase and the outgoing phase of each metasurface unit, the phase adjustment value is calculated by using the following formula:

[0028]

[0029] wherein, represents the phase adjustment value of the metasurface unit in the mth row and the nth column in the metasurface, represents the incident phase of the metasurface unit in the mth row and the nth column in the metasurface, represents the outgoing phase of the metasurface unit in the mth row and the nth column in the metasurface, δ1=sinθ des -sinθ inc , d is the side length of the metasurface unit, λ is the wavelength of the GPS signal, the elevation angle and the azimuth angle of the signal incoming direction are θ inc and the elevation angle and the azimuth angle of the target transmission direction are θ des and

[0030] In some embodiments of the present application, in the step of determining whether the phase of the corresponding metasurface unit is adjusted to 0 or π based on the phase adjustment value, it is determined whether the phase adjustment value is in the range of , if yes, it is determined that the phase of the corresponding metasurface unit is 0, and if no, it is determined that the phase of the corresponding metasurface unit is π.

[0031] Additional advantages, objects, and features of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following or can be learned from practice of the application. The objects and other advantages of the application can be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

[0032] It will be understood by those skilled in the art that the objects and advantages of the present application can be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings. BRIEF DESCRIPTION OF DRAWINGS

[0033] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description, serve to explain the principles of the application.

[0034] Figure 1 Structure diagram of an embodiment of the metasurface unit of the present application;

[0035] Figure 2 Diagram of the incident surface layer of the metasurface unit of the present application;

[0036] Figure 3 Diagram of the exit surface layer of the metasurface unit of the present application;

[0037] Figure 4 Diagram of the projection of the incident surface layer direction of the metasurface of the present application;

[0038] Figure 5 Diagram of the projection of the exit surface layer direction of the metasurface of the present application

[0039] Figure 6 Diagram of the incident and exit signals of the metasurface coding scheme of the present application;

[0040] Figure 7 Diagram of two current paths provided by the metasurface unit structure of the present application;

[0041] Figure 8 Diagram of the direction of the voltage-controlled diode and the signal current of the present application;

[0042] Figure 9 Diagram of the connection of the printed circuit layer in the metasurface of the present application. DETAILED DESCRIPTION

[0043] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to embodiments and drawings. Here, the illustrative embodiments of the present application and their descriptions are used to explain the present application but are not used as limitations to the present application.

[0044] Here, it also needs to be noted that, in order to avoid the present application being obscured by unnecessary details, only the structures and / or processing steps closely related to the solutions according to the present application are shown in the drawings, and other details not closely related to the present application are omitted.

[0045] As shown in Figures 1-5 The present application provides an ultracstructure surface for indoor positioning GPS relay, which comprises a plurality of ultracstructure surface units.

[0046] The ultracstructure surface unit comprises an incident surface layer, a first shielding layer, an intermediate layer, a second shielding layer and an exit surface layer arranged in sequence.

[0047] The incident surface layer and the exit surface layer comprise ITO films, each of which is provided with two rectangular openings with equal lengths, the two rectangular openings are arranged in parallel, and each of the two rectangular openings is arranged close to a side edge of the ITO film in the length direction, the ITO film is provided with a communication opening communicating the two rectangular openings, the communication opening is perpendicular to the two rectangular openings and extends from one end of one rectangular opening to the other rectangular opening.

[0048] A printed circuit for connecting power supply is arranged between the second shielding layer and the intermediate layer.

[0049] By adopting the above solution, the incident surface layer and the exit surface layer are both provided with two rectangular openings and a communication opening, the two rectangular openings and the communication opening form an asymmetric U-shaped structure, which can provide two different paths for the surface current passing through the structure, as shown in Figure 7 The two orthogonal mode signals required by the circularly polarized signal are provided through this unit structure to improve the transmission efficiency of the circularly polarized signal, the phases of the ultracstructure surface units are adjusted by turning on and off the printed circuit, the beamforming is completed for the incident signal, a high-intensity signal is provided for the set direction, and thus the coverage of the GPS signal for the indoor scene is provided.

[0050] In some embodiments of the present application, in the projection direction of the incident surface layer of the ultracstructure surface unit, the two rectangular openings of the incident surface layer and the exit surface layer coincide.

[0051] In some embodiments of the present application, the incident surface layer includes one communication opening extending from one end of the lower rectangular opening away from the ITO film side edge to the other rectangular opening; the exit surface layer includes two communication openings respectively extending from one end of the two rectangular openings away from the ITO film side edge to the other rectangular opening.

[0052] In the specific implementation process, the two communication openings of the exit surface layer are respectively provided with a PIN diode.

[0053] The present scheme designs a diode feed for the bottom electrode. Among them, the two rectangular electrodes and the bottom exit surface layer are designed to be conductive, and are connected to the edge of the metasurface through a circuit to complete the feed. The lead wire extended from the circuit layer is connected to the positive electrode of the voltage, and the negative electrode of the voltage is connected to the second shielding layer. As shown in Figure 8 By applying a voltage, the direction of the signal flowing out of the back unit can be controlled, resulting in different opening directions of the back unit, achieving 0 or π phase adjustment.

[0054] By controlling the bias voltage of the two PIN diodes, the opening direction of the U-shaped structure can be adjusted, and the phase of the incident signal can be controlled to be 0 or π. For left-handed circularly polarized GPS signals, the present scheme designs the structure unit as an asymmetric U-shaped structure to provide two different paths for the surface current. As shown in Figure 7 This unit structure provides two orthogonal mode signals required by circularly polarized signals to improve the transmission efficiency of circularly polarized signals. By adjusting the phase of different units on the surface, beamforming is completed for the incident signal, which can provide high-intensity signals for the set direction, thereby providing coverage of GPS signals for indoor scenes.

[0055] In the specific implementation process, the incident surface layer uses an ITO film with a surface resistance of 10 ohms and a thickness of 200 nm, which is cut into a specified pattern and pasted on the upper surface to form a U-shaped patch antenna that responds to signals of the corresponding frequency band. In order to respond to left-handed circularly polarized GPS signals, the present scheme further designs this structure as an asymmetric U-shaped structure to provide two path lengths for the surface current. As shown in Figure 7 The difference in path length of the surface current causes the signals passing through the two paths to produce orthogonal phase differences, enabling this unit structure to respond to circularly polarized signals with high transmission efficiency.

[0056] In some embodiments of the present application, the metasurface unit comprises a first conducting wire and a second conducting wire, one end of the first conducting wire is connected to the ITO film of the incident surface layer and extends perpendicularly to the incident surface layer to the intermediate layer; one end of the second conducting wire is connected to the ITO film of the exit surface layer and extends perpendicularly to the exit surface layer to the intermediate layer and is connected to the printed circuit.

[0057] In some embodiments of the present application, the printed circuit comprises two metal plates and a metal wire connecting the two metal plates, the two metal plates are arranged in parallel, and at the middle position of the length direction of the two metal plates, they are respectively connected to the two second conducting wires.

[0058] In some embodiments of the present application, the metasurface unit further comprises a third conducting wire, one end of the third conducting wire is connected to the ITO film of the incident surface layer at the barycenter position, and the other end extends perpendicularly to the ITO film of the exit surface layer and is connected to the barycenter position of the ITO film of the exit surface layer.

[0059] In the specific implementation process, the third conducting wire, the first conducting wire and the second conducting wire are all constructed in the way of silver infusion, so that the front and back structures of the metasurface are conductive, and direct signal transmission through the substrate and the metasurface can also be avoided.

[0060] In some embodiments of the present application, the first shielding layer, the intermediate layer and the second shielding layer all adopt PET substrate material.

[0061] In some embodiments of the present application, the cross-sectional areas of the first shielding layer, the intermediate layer and the second shielding layer are equal, the cross-sectional areas of the incident surface layer and the exit surface layer are equal, and the cross-sectional areas of the first shielding layer, the intermediate layer and the second shielding layer are greater than the cross-sectional areas of the incident surface layer and the exit surface layer.

[0062] As shown in FIG. 1, Figure 9 In some embodiments of the present application, the metasurface for indoor positioning GPS relay is obtained by splicing a plurality of metasurface units, the printed circuit of each metasurface unit is connected by a metal wire and extends to the edge of the metasurface for connecting the power supply, and by whether the power supply of the metasurface unit is turned on, it is determined that the phase of the metasurface unit is 0 or π.

[0063] In the specific implementation process, in the direction of the orthographic projection of the incident surface layer of the metasurface unit, each metasurface unit is a square with equal side length, and the side length is d.

[0064] In the specific implementation process, the printed circuit and the metal wire all adopt copper material.

[0065] As shown in FIG. 1, Figure 6As shown, a metasurface control method, the steps of the method include:

[0066] Obtaining the signal incoming direction and the target transmission direction of the metasurface, determining the pitch angle and the direction angle of the signal incoming direction based on the signal incoming direction, and determining the pitch angle and the direction angle of the target transmission direction based on the target transmission direction;

[0067] Calculating the incident phase of each metasurface unit in the metasurface based on the pitch angle and the direction angle of the signal incoming direction, and calculating the exit phase of each metasurface unit in the metasurface based on the pitch angle and the direction angle of the target transmission direction;

[0068] Calculating the phase adjustment value based on the incident phase and the exit phase of each metasurface unit, and determining that the phase of the corresponding metasurface unit is adjusted to 0 or π based on the phase adjustment value.

[0069] With the above scheme, the scheme can realize directional transmission for the target direction based on the above metasurface structure of indoor positioning GPS relay, and better provide determination of positioning information for the indoor environment, improve processing precision, and ensure transmission effect for the corresponding direction.

[0070] In some embodiments of the present application, in the steps of calculating the incident phase and the exit phase of each metasurface unit in the metasurface based on the pitch angle and the direction angle of the signal incoming direction, and calculating the exit phase of each metasurface unit in the metasurface based on the pitch angle and the direction angle of the target transmission direction, the incident phase and the exit phase are calculated by the following formula:

[0071]

[0072] Wherein, represents the incident phase of the metasurface unit in the mth row and the nth column of the metasurface, represents the exit phase of the metasurface unit in the mth row and the nth column of the metasurface, d is the side length of the metasurface unit, λ is the wavelength of the GPS signal, and the pitch angle and the direction angle of the signal incoming direction are θ inc and The pitch angle and the direction angle of the target transmission direction are θ des and

[0073] In some embodiments of the present application, in the step of calculating the phase adjustment value based on the incident phase and the exit phase of each metasurface unit, the phase adjustment value is calculated based on the following formula:

[0074]

[0075] Wherein, a phase adjustment value of a super-structured surface unit in the mth row and nth column of the super-structured surface, an incident phase of a super-structured surface unit in the mth row and nth column of the super-structured surface, an incident phase of a super-structured surface unit in the mth row and nth column of the super-structured surface, des -sinθ inc , d is the side length of the super-structured surface unit, λ is the wavelength of the GPS signal, the pitch angle and the direction angle of the signal transmission direction are θ inc and the pitch angle and the direction angle of the target transmission direction are θ des and

[0076] In some embodiments of the present application, in the step of determining whether the phase of the corresponding super-structured surface unit is 0 or π based on the phase adjustment value, it is determined whether the phase adjustment value is in the range of If yes, it is determined that the phase of the corresponding super-structured surface unit is 0, and if not, it is determined that the phase of the corresponding super-structured surface unit is π.

[0077] In the implementation process, in order to complete beamforming, the present application knows the incident signal direction and the target outgoing signal direction. For the incident direction, the satellite orbit information provided by the ephemeris of the GPS satellite is used to predict the current satellite position, so as to calculate the pitch angle and the direction angle of the incident angle. For the target outgoing angle, since the GPS receiver calculates the distance from the satellite to the receiver by synchronizing the clock with the satellite and calculating the signal propagation time delay, the GPS does not require a strict continuous link, and the present application uses a scanning method to complete the coding for the super-structured surface. Specifically, the present application sets θ des to 0, and sets to 20° steps from -60° to +60°, and completes a cycle within one second to ensure that any user in an indoor scene can obtain GPS samples within 1s and complete normal ranging.

[0078] In order to provide high-quality GPS signals for indoor environments, the super-structured surface of the present application is an artificial structure array composed of sub-wavelength unit periods or non-periodic arrangements, and the equivalent material properties can be customized and the electromagnetic waves can be freely controlled by designing the structure units and their arrangement. Grouping these super-material units into a super-structured surface is a digital way to characterize the functional elements of super-materials, and by controlling different coding sequences, electromagnetic waves can be real-time regulated, and the on-site programmable function of radio frequency signals can be realized, and the electromagnetic waves can be finely modulated in amplitude, phase, frequency, polarization and waveform.

[0079] Those of ordinary skill in the art will appreciate that the various illustrative components, systems and methods described in connection with the embodiments disclosed herein can be implemented as hardware, software, or both. The particular implementation is dependent on the specific application and design constraints imposed on the overall system. Skilled persons can implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application. When implemented in hardware, for example, the hardware can comprise an electronic circuit, an Application Specific Integrated Circuit (ASIC), a suitable firmware, a plug-in, a functional card, etc. When implemented in software, the elements of the application are the program or code segments to perform a specific task. The program or code segments can be stored in a machine-readable medium, or transmitted by a carrier wave as data signals over a transmission medium or communication link.

[0080] It is to be understood that the application is not limited to the particular configurations and processes described herein and shown in the drawings. For simplicity, detailed descriptions of known methods are omitted. In the above-described embodiments, several specific steps are described and shown as examples. However, the method processes of the application are not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order of the steps, after understanding the spirit of the application.

[0081] In the present application, features described and / or illustrated with respect to one embodiment can be used in the same or a similar way in one or more other embodiments, and / or in combination with or in place of features of other embodiments.

[0082] The above description is merely illustrative of the application, and is not intended to limit the application. The embodiments of the application can be modified and changed in various ways by those skilled in the art, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the application should be included in the protection scope of the application.

Claims

1. A metasurface for indoor positioning GPS relays, characterized in that, The super-structure surface for indoor positioning GPS relay comprises a plurality of super-structure surface units; The super-structure surface unit comprises sequentially arranged incident surface layer, first shielding layer, intermediate layer, second shielding layer and exit surface layer; The incident surface layer and the exit surface layer comprise ITO film, the ITO film is provided with two rectangular openings with equal length, the two rectangular openings are arranged in parallel, and the two rectangular openings are arranged close to the two side edges of the ITO film in the length direction respectively, the ITO film is provided with a communication opening communicating the two rectangular openings, the communication opening is perpendicular to the two rectangular openings, extends from one end of one rectangular opening to the other rectangular opening, the two rectangular openings and the communication opening form an asymmetric U-shaped structure, and the two communication openings of the exit surface layer are respectively provided with a PIN diode; The second shielding layer and the intermediate layer are provided with a printed circuit for connecting the power supply, the lead wire extending from the circuit layer is connected to the positive electrode of the voltage, the negative electrode of the voltage is connected to the second shielding layer, and the bias voltage of the two PIN diodes is controlled; The super-structure surface unit comprises a first conducting wire and a second conducting wire, one end of the first conducting wire is connected to the ITO film of the incident surface layer and extends to the intermediate layer perpendicularly to the incident surface layer; One end of the second conducting wire is connected to the ITO film of the exit surface layer, extends to the intermediate layer perpendicularly to the exit surface layer and is connected to the printed circuit.

2. The metasurface for indoor positioning GPS relaying of claim 1, wherein, In the projection direction of the incident surface layer of the super-structure surface unit, the two rectangular openings of the incident surface layer and the exit surface layer coincide.

3. The metasurface for indoor positioning GPS relaying of claim 1, wherein, The incident surface layer comprises one communication opening extending from one end of the rectangular opening away from the side edge of the ITO film to the other rectangular opening; the exit surface layer comprises two communication openings respectively extending from one end of the two rectangular openings away from the side edge of the ITO film to the other rectangular opening.

4. The metasurface for indoor positioning GPS relaying of claim 1, wherein, The printed circuit comprises two metal plates and a metal wire connecting the two metal plates, the two metal plates are arranged in parallel, and at the middle position of the length direction of the two metal plates, the two second conducting wires are connected respectively.

5. The metasurface for indoor positioning GPS relaying of claim 1, wherein, The super-structure surface unit further comprises a third conducting wire, one end of the third conducting wire is connected to the ITO film of the incident surface layer at the barycenter position of the ITO film, and the other end extends to the ITO film of the exit surface layer perpendicularly and is connected to the barycenter position of the ITO film of the exit surface layer.

6. A metasurface control method, comprising: The method adopts the super-structure surface according to any one of claims 1-4, and the steps of the method comprise: obtaining the signal incoming direction and the target transmission direction of the super-structure surface, determining the pitch angle and the direction angle of the signal incoming direction based on the signal incoming direction, and determining the pitch angle and the direction angle of the target transmission direction based on the target transmission direction; calculating the incident phase of each super-structure surface unit in the super-structure surface based on the pitch angle and the direction angle of the signal incoming direction, and calculating the exit phase of each super-structure surface unit in the super-structure surface based on the pitch angle and the direction angle of the target transmission direction; and The phase adjustment value is calculated based on the incident phase and the exit phase of each metasurface unit, and the phase adjustment of the corresponding metasurface unit is determined as 0 or π based on the phase adjustment value.

7. The metasurface control method of claim 6, wherein, In the steps of calculating the incident phase of each metasurface unit in the metasurface based on the elevation angle and the direction angle of the signal incoming direction, and calculating the exit phase of each metasurface unit in the metasurface based on the elevation angle and the direction angle of the target transmission direction, the incident phase and the exit phase are calculated by using the following formulas: ； ； wherein, represents the incident phase of the super-constituent unit in the mth row and nth column of the super-constituent surface, represents the exit phase of the super-constituent unit in the mth row and nth column of the super-constituent surface, is the side length of the super-constituent unit, is the wavelength of the GPS signal, and the pitch angle and the direction angle of the signal transmission direction are and , and the pitch angle and the direction angle of the target transmission direction are and .

8. The metasurface control method of claim 6, wherein, In the step of calculating the phase adjustment value based on the incident phase and the exit phase of each metasurface unit, the phase adjustment value is calculated based on the following formula: ； wherein, denotes the phase adjustment value of the super-constituent in the mth row and nth column of the super-constituent, denotes the incident phase of the super-constituent in the mth row and nth column of the super-constituent, denotes the exit phase of the super-constituent in the mth row and nth column of the super-constituent, , , is the side length of the super-constituent, is the wavelength of the GPS signal, the pitch angle and the direction angle of the signal transmission direction are and , the pitch angle and the direction angle of the target transmission direction are and .

9. The metasurface control method of any one of claims 6-8, wherein, In the step of determining whether to adjust the phase of the corresponding metasurface unit to 0 or π based on the phase adjustment value, it is determined whether the phase adjustment value is in the range of [0, π / 2) or (π / 2, π]. If yes, it is determined that the phase of the corresponding metasurface unit is 0; if no, it is determined that the phase of the corresponding metasurface unit is π. In the step of determining whether to adjust the phase of the corresponding metasurface unit to 0 or π based on the phase adjustment value, it is determined whether the phase adjustment value is in the range of [0, π / 2) or (π / 2, π). If yes, it is determined that the phase of the corresponding metasurface unit is 0; if no, it is determined that the

Images