Satellite-to-ground communication method, system, medium and satellite based on intelligent metasurface assistance

Abstract

The present invention provides a satellite-to-ground communication method, system, medium and satellite assisted by intelligent metasurface, the method comprising the following steps: establishing an auxiliary link with a ground user based on the intelligent metasurface; obtaining the beam coverage of the satellite; and controlling the intelligent metasurface to achieve satellite beam coverage control and switching optimization when the ground user changes from within the beam coverage to outside the beam coverage due to the movement of the satellite. The satellite-to-ground communication method, system, medium and satellite assisted by intelligent metasurface of the present invention improve the service quality of ground users while reducing the number of ground user satellite switching times based on intelligent metasurface assisted satellite coverage control and satellite switching.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless communications, and in particular to a satellite-to-earth communication method, system, medium and satellite based on the assistance of an intelligent metasurface. Background Art

[0002] With the technological evolution of satellite communication networks and the deployment of constellations, satellite-to-ground communications have gradually become an important part of the next-generation wireless communication system. Relying on its wide-area coverage and seamless connection characteristics, it will play an irreplaceable role in typical scenarios such as post-disaster communication recovery, hotspot coverage, and blind spot filling in remote areas, providing important support for the realization of global air, land, and sea integration.

[0003] Due to the wide-area characteristics of satellite coverage, the ubiquitous nature of ground users, and the limited communication spectrum, satellite-to-ground communications face the challenges of dynamic user access and efficient use of spectrum resources. In order to achieve effective coverage of a specific area, satellite-to-ground communications usually use multi-beam technology to achieve wide-area coverage and frequency reuse, thereby achieving user inter-satellite switching and intra-satellite beam switching.

[0004] However, due to the deployment of ultra-dense low-orbit satellite networks and the limited satellite spectrum resources, satellites face complex inter-beam interference problems, especially due to the mobility of low-orbit satellites and factors such as the curvature of the earth, the same satellite beam faces dynamic changes in coverage at different elevation angles. The same beam of a satellite has a wider coverage at low elevation angles than at high elevation angles. This causes ground users in a specific area to enter the beam coverage at low elevation angles of the satellite and establish a connection with the satellite. As the satellite elevation angle increases, the satellite's beam coverage decreases, which causes users in the area to no longer be within the beam coverage, resulting in service interruption. Satellite or beam switching needs to be performed again, thus facing the problem of frequent switching in a short period of time. This poses a more severe challenge to the co-channel interference management and user switching of satellite-to-ground communications. The traditional method of controlling satellite beam coverage to prevent beam broadening mainly adopts the method of controlling the number of antenna activations. However, due to the limitations of on-board processing capabilities and the high-speed mobility of satellites, dynamically controlling the number of activated antennas to change the satellite beam coverage faces high processing complexity and poses challenges to satellites with limited payload and power consumption. Satellite-to-ground communications urgently need a low-cost, high-gain innovative technology to achieve effective satellite coverage and switching optimization, thereby achieving interference avoidance and service enhancement in satellite-to-ground communications.

[0005] Reconfigurable intelligent surface (RIS) is developed from electromagnetic metamaterials. Due to its significant performance advantages of low cost, low power consumption, high gain and easy deployment, it is widely regarded as an important physical layer technology for the next generation of mobile communication systems. The intelligent metasurface is composed of a large number of electromagnetic array elements that can realize signal reflection, transmission or simultaneous reflection and transmission. By regulating the electromagnetic parameters such as the amplitude, phase and polarization of the incident signal, a double-hop link is constructed in a quasi-relay form to suppress or enhance the signal strength in a specific coverage area, thereby realizing the intelligent reconstruction of the wireless propagation environment.

[0006] The dynamic control characteristics of intelligent metasurfaces on signals enable them to effectively solve the interference avoidance and user switching problems faced by low-orbit satellites due to the dynamic changes in beam coverage areas. However, existing research on intelligent metasurface-assisted satellite-to-ground communications has mostly focused on intelligent metasurface-assisted satellite-to-ground signal enhancement, and has not paid attention to low-orbit satellite beam coverage control and satellite switching optimization. Summary of the invention

[0007] In view of the shortcomings of the prior art mentioned above, the purpose of the present invention is to provide a satellite-to-earth communication method, system, medium and satellite based on the assistance of intelligent metasurface, based on the intelligent metasurface-assisted satellite coverage control and satellite switching, to improve the service quality of ground users while reducing the number of satellite switching times of ground users.

[0008] In a first aspect, the present invention provides a satellite-to-ground communication method assisted by an intelligent metasurface, which is applied to a satellite, and the method includes the following steps: establishing an auxiliary link with a ground user based on the intelligent metasurface; obtaining the beam coverage of the satellite; and due to the movement of the satellite, when the ground user changes from within the beam coverage to outside the beam coverage, controlling the intelligent metasurface to achieve satellite beam coverage control and switching optimization.

[0009] In an implementation of the first aspect, due to the movement of the satellite, when the ground user changes from within the beam coverage to outside the beam coverage, controlling the smart metasurface to achieve satellite beam coverage control and switching optimization includes the following steps:

[0010] When the ground user has other visible satellites and the signal strength of the other visible satellites meets the needs of the ground user, the reflection coefficient of the smart metasurface is adjusted, and the satellite signal strength received by the ground user is reduced based on the auxiliary link, so that the satellite signal strength is less than the switching signal strength to prevent the ground user from accessing the satellite;

[0011] When the ground user has no other visible satellites, the reflection coefficient of the intelligent metasurface is adjusted to enhance the satellite signal strength received by the ground user based on the auxiliary link so that the satellite signal strength is greater than the switching signal strength to maintain the communication connection between the satellite and the ground user.

[0012] In an implementation of the first aspect, the satellite regulates the satellite signal strength by controlling array element parameters of the smart metasurface.

[0013] In a second aspect, the present invention provides a satellite-to-ground communication system based on the assistance of an intelligent metasurface, which is applied to a satellite, and the system includes an establishment module, an acquisition module and a control module;

[0014] The establishing module is used to establish an auxiliary link with a ground user based on the intelligent metasurface;

[0015] The acquisition module is used to acquire the beam coverage of the satellite;

[0016] The control module is used to control the intelligent metasurface to realize satellite beam coverage control and switching optimization when the ground user changes from within the beam coverage to outside the beam coverage due to the movement of the satellite.

[0017] In a third aspect, the present invention provides a storage medium having a computer program stored thereon, which, when executed by a processor, implements the above-mentioned satellite-to-earth communication method assisted by an intelligent metasurface.

[0018] In a fourth aspect, the present invention provides a satellite, comprising: a processor and a memory;

[0019] The memory is used to store computer programs;

[0020] The processor is used to execute the computer program stored in the memory so that the electronic device performs the above-mentioned satellite-to-earth communication method assisted by the intelligent metasurface.

[0021] In a fifth aspect, the present invention provides a satellite-to-ground communication system assisted by an intelligent metasurface, comprising a ground user, an intelligent metasurface and the above-mentioned satellite;

[0022] The intelligent metasurface is used to establish an auxiliary link between the satellite and the ground user.

[0023] In an implementation of the fifth aspect, the intelligent metasurface is capable of serving multiple ground users simultaneously.

[0024] In an implementation of the fifth aspect, the working mode of the smart metasurface is a transmission mode, a reflection mode, or a simultaneous transmission and reflection mode, and the smart metasurface works in a passive mode or an active mode.

[0025] In an implementation of the fifth aspect, the ground user can access multiple satellites simultaneously.

[0026] As described above, the satellite-to-earth communication method, system, medium and satellite based on the assistance of intelligent metasurface of the present invention have the following beneficial effects:

[0027] (1) By controlling the satellite signal strength in a specific area at a specific time through the intelligent metasurface, the number of user satellite / beam switching caused by changes in satellite beam coverage for specific ground users is reduced, and the co-frequency interference between beams and between satellites is controlled;

[0028] (2) The overall performance of multiple ground users within a specific satellite coverage area is improved through the joint optimization of intelligent metasurface beam reconstruction and satellite switching. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Shown is a flow chart of a satellite-to-ground communication method based on intelligent metasurface assistance in one embodiment of the present invention;

[0030] Figure 2 Shown is a schematic diagram of a framework of a satellite-to-ground communication system assisted by an intelligent metasurface according to an embodiment of the present invention;

[0031] Figure 3 Shown is a schematic diagram of a framework of a satellite-to-ground communication system assisted by an intelligent metasurface according to another embodiment of the present invention;

[0032] Figure 4 Shown is a schematic structural diagram of a satellite-to-ground communication system assisted by an intelligent metasurface in one embodiment of the present invention;

[0033] Figure 5 Shown is a schematic structural diagram of a satellite in one embodiment of the present invention. DETAILED DESCRIPTION

[0034] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0035] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0036] As the integration of air, space, land and sea becomes an important evolution direction for the next generation of mobile communications, satellite communications are regarded as a key technology for achieving global wide-area coverage. However, due to the high-speed mobility of low-orbit satellites relative to ground users, ground users face frequent satellite switching after accessing satellite services. In particular, the coverage area will change when the satellite moves from low elevation angles to high elevation angles, further increasing the number of switches for specific users in a short period of time and causing interference problems between beams. Smart metasurfaces have been pre-researched as important relay nodes in 6G networks due to their low-cost and high-gain performance advantages. Within the wide-area coverage of satellites, the ubiquitous deployment of smart metasurfaces provides a new solution for reconstructing the satellite-to-ground wireless propagation environment and enhancing satellite-to-ground communication signals.

[0037] Satellites generate multiple beams through phased array antennas to achieve coverage of multiple beam positions, and provide satellite network access services for multiple ground users at the same time. Due to the high-speed mobility of low-orbit satellites relative to the ground, the time that ground users can access a single satellite / single beam is limited, which requires ground users to frequently switch between satellite multiple beams and multiple satellites to maintain data service quality and link stability. Among them, the satellite switching method based on signal strength as the switching criterion can ensure that ground users obtain the best signal strength within the service demand time, but also faces a high number of switching times. It should be noted that in the satellite switching method based on signal strength as the switching criterion, if a ground user accesses multiple satellites (that is, the user establishes multiple connections with the satellite), multiple satellites with higher received signal strength can be selected according to real-time performance requirements and the upper limit of the number of satellite accesses. In addition, due to the movement of satellites, the set of satellites for a single user to establish multiple connections is also dynamically changing, that is, the switching occurs between two satellites, and multiple satellites are not switched simultaneously as a whole. In addition, the access method of ground users and satellites with multiple connections can reduce the service interruption problem of users when switching satellites, and effectively improve the system throughput.

[0038] like Figure 1 As shown, in one embodiment, the satellite-to-ground communication method based on the assistance of intelligent metasurface of the present invention is applied to a satellite. The method includes steps S1 to S3.

[0039] Step S1: Establish an auxiliary link with ground users based on the intelligent metasurface.

[0040] Specifically, Figure 2As shown, a smart metasurface is provided between the ground user and the satellite. The smart metasurface establishes an auxiliary link between the satellite and the ground user, for realizing auxiliary link communication between the satellite and the ground user. It should be noted that the ground user can access multiple satellites at the same time.

[0041] In one embodiment, the smart metasurface can serve multiple ground users simultaneously. The working mode of the smart metasurface is a transmission mode, a reflection mode, or a simultaneous transmission and reflection mode. The smart metasurface works in a passive mode or an active mode, which can be selected according to the needs of the actual application scenario.

[0042] Step S2: Obtain the beam coverage of the satellite.

[0043] Specifically, the beam coverage of the satellite changes with the elevation angle of the satellite. Figure 2 As shown, when the satellite is at a low elevation angle, the beam coverage is large, and the ground user 1 is located within the beam coverage. When the satellite is at a high elevation angle, the beam coverage becomes smaller, and the ground user 1 is located outside the beam coverage.

[0044] In one embodiment, the smart metasurface can be deployed on dynamic nodes such as satellites, high-altitude platforms and drones, or in static scenes such as the facades of ground buildings, so that the smart metasurface is within the range of the beam to be controlled, and effective beam coverage range control is achieved through beam shaping of the smart metasurface.

[0045] Step S3: Due to the movement of the satellite, when the ground user changes from within the beam coverage to outside the beam coverage, the intelligent metasurface is controlled to realize satellite beam coverage control and switching optimization.

[0046] Specifically, as the satellite moves rapidly, its elevation angle changes, causing the beam coverage to change. Figure 3 As shown, in the downlink communication system of multi-user satellite service assisted by the intelligent metasurface within the coverage of the satellite beam, there is a low-orbit satellite (satellite-S1), a reflective intelligent metasurface (R1) and two ground users (user-U1, user-U2). The intelligent metasurface R1 is deployed near the ground user-U1 and the ground user-U2. As the satellite moves, the intelligent metasurface R1 establishes a dynamic auxiliary link for satellite-to-ground communication. At time T0, the elevation angle of satellite-S1 relative to the ground user-U1 and the ground user-U2 is low, and its coverage range is represented as area 0 (Area0). As satellite-S1 moves, at time T1, the elevation angle of satellite-S1 relative to the ground user-U1 and the ground user-U2 increases, and its coverage range is represented as area 1 (Area1).

[0047] At time T0, user-U1 and user-U2 are both within the beam coverage of satellite-S1, and user-U1 and user-U2 access satellite-S1 according to the satellite signal strength. In the process from time T0 to time T1, the beam coverage of satellite-S1 changes dynamically. At time T1, user-U2 is no longer within the coverage of the current beam of satellite-S1, and inter-satellite switching or intra-satellite beam switching is required. This frequent switching in a short period of time seriously affects the satellite service quality of ground user-U2. Therefore, the present invention controls the satellite signal strength received by ground user-U2 by controlling the array element parameters of the intelligent metasurface, thereby realizing satellite beam coverage control and switching optimization.

[0048] Specifically, the satellite should give priority to meeting the service needs of ground users to avoid service interruption caused by the current user having no available satellites. Secondly, the satellite should try to avoid intra-satellite beam switching or inter-satellite switching of ground users in a short period of time. Therefore, when the ground user changes from within the beam coverage to outside the beam coverage, the satellite beam coverage control and switching optimization strategy includes:

[0049] (1) Low elevation angle coverage suppression strategy

[0050] When the ground user has other visible satellites and the signal strength of the other visible satellites meets the needs of the ground user, the reflection coefficient of the intelligent metasurface is adjusted, and the satellite signal strength received by the ground user is reduced based on the auxiliary link, so that the satellite signal strength is less than the switching signal strength to avoid the ground user from accessing the satellite, thereby avoiding frequent switching of ground users in a short period of time and achieving control of satellite beam coverage. On the other hand, since this strategy can control the expansion of satellite beam coverage, it has a better effect on avoiding inter-satellite or inter-beam interference. Among them, the satellite adjusts the reflection coefficient of the intelligent metasurface by controlling the array element parameters of the intelligent metasurface, thereby adjusting the satellite signal strength.

[0051] (2) High-elevation-angle coverage enhancement strategy

[0052] When the ground user has no other visible satellites, the reflection coefficient of the smart metasurface is adjusted to improve the satellite signal strength received by the ground user based on the auxiliary link, so that the satellite signal strength is greater than the switching signal strength to maintain the communication connection between the satellite and the ground user, thereby reducing the frequent switching of the ground user in a short time. Since this strategy meets the access needs of ground users, it leads to the expansion of satellite beam coverage, and interference management between satellites or beams is required.

[0053] In summary, in the present invention, considering the mobility characteristics of the satellite, the dynamic change of the link topology between the satellite, the intelligent super surface and the ground user, the satellite needs to select the appropriate satellite coverage control and switching optimization joint strategy according to the access application of the ground user, the satellite beam state and the state of the adjacent satellite. The intelligent super surface also needs to dynamically adjust the array element parameters based on the determined satellite coverage control and switching optimization joint strategy to achieve different optimization goals.

[0054] The protection scope of the satellite-to-earth communication method based on the assistance of intelligent metasurface described in the embodiment of the present invention is not limited to the execution order of the steps listed in this embodiment. All solutions implemented by adding, reducing or replacing steps in the prior art based on the principles of the present invention are included in the protection scope of the present invention.

[0055] An embodiment of the present invention also provides a satellite-to-ground communication system assisted by an intelligent metasurface. The satellite-to-ground communication system assisted by an intelligent metasurface can implement the satellite-to-ground communication method assisted by an intelligent metasurface described in the present invention. However, the implementation device of the satellite-to-ground communication system assisted by an intelligent metasurface described in the present invention includes but is not limited to the structure of the satellite-to-ground communication system assisted by an intelligent metasurface listed in this embodiment. All structural deformations and replacements of the prior art made according to the principles of the present invention are included in the protection scope of the present invention.

[0056] The satellite-to-ground communication system based on intelligent metasurface assistance of the present invention is applied to satellites. Figure 4 As shown, in one embodiment, the satellite-to-ground communication system based on the assistance of intelligent metasurface of the present invention includes an establishment module 41, an acquisition module 42 and a control module 43.

[0057] The establishing module 41 is used to establish an auxiliary link with a ground user based on the smart metasurface.

[0058] The acquisition module 42 is used to acquire the beam coverage of the satellite.

[0059] The control module 43 is connected to the establishment module 41 and the acquisition module 42, and is used to control the intelligent metasurface to realize satellite beam coverage control and switching optimization when the ground user changes from within the beam coverage to outside the beam coverage due to the movement of the satellite.

[0060] The structures and principles of the establishment module 41 , the acquisition module 42 and the control module 43 correspond one to one with the steps in the above-mentioned method for adaptively identifying EEG signals, and therefore will not be described in detail here.

[0061] In the several embodiments provided by the present invention, it should be understood that the disclosed system, device or method can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of modules / units is only a logical function division, and there may be other division methods in actual implementation, such as multiple modules or units can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or modules or units, which can be electrical, mechanical or other forms.

[0062] The modules / units described as separate components may or may not be physically separated, and the components displayed as modules / units may or may not be physical modules, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules / units may be selected according to actual needs to achieve the purpose of the embodiments of the present invention. For example, the functional modules / units in the various embodiments of the present invention may be integrated into one processing module, or each module / unit may exist physically separately, or two or more modules / units may be integrated into one module / unit.

[0063] Those of ordinary skill in the art should further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0064] The embodiment of the present invention also provides a computer-readable storage medium. A person of ordinary skill in the art can understand that all or part of the steps in the method for adaptively identifying EEG signals in the above embodiment can be completed by instructing a processor through a program, and the program can be stored in a computer-readable storage medium, and the storage medium is a non-transitory medium, such as a random access memory, a read-only memory, a flash memory, a hard disk, a solid-state hard disk, a magnetic tape, a floppy disk, an optical disc, and any combination thereof. The above storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or a data center that includes one or more available media. The available medium can be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a digital video disc (DVD)), or a semiconductor medium (e.g., a solid-state disk (SSD)), etc.

[0065] An embodiment of the present invention further provides a satellite, wherein the satellite includes a processor and a memory.

[0066] The memory is used to store computer programs.

[0067] The memory includes: ROM, RAM, disk, USB flash drive, memory card or CD and other media that can store program codes.

[0068] The processor is connected to the memory and is used to execute the computer program stored in the memory so that the satellite executes the above-mentioned electroencephalogram signal adaptive recognition method.

[0069] Preferably, the processor can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components.

[0070] like Figure 5As shown, the satellite of the present invention is in the form of a general-purpose computing device. The components of the satellite may include, but are not limited to: one or more processors or processing units 51, a memory 52, and a bus 53 connecting different system components (including the memory 52 and the processing unit 51).

[0071] Bus 53 represents one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, a processor or a local bus using any of a variety of bus architectures. For example, these architectures include but are not limited to Industry Standard Architecture (ISA) bus, Micro Channel Architecture (MAC) bus, Enhanced ISA bus, Video Electronics Standards Association (VESA) local bus and Peripheral Component Interconnect (PCI) bus.

[0072] Satellites typically include a variety of computer system readable media. These media can be any available media that can be accessed by the satellite, including volatile and non-volatile media, removable and non-removable media.

[0073] Memory 52 may include computer system readable media in the form of volatile memory, such as random access memory (RAM) 521 and / or cache memory 522. The satellite may further include other removable / non-removable, volatile / non-volatile computer system storage media. By way of example only, storage system 523 may be used to read and write non-removable, non-volatile magnetic media ( Figure 5 not shown, usually called a "hard drive"). Although Figure 5 Not shown, a disk drive for reading and writing to a removable non-volatile disk (e.g., a "floppy disk"), and an optical disk drive for reading and writing to a removable non-volatile optical disk (e.g., a CD-ROM, a DVD-ROM, or other optical media) may be provided. In these cases, each drive may be connected to the bus 53 via one or more data medium interfaces. The memory 52 may include at least one program product having a set (e.g., at least one) of program modules that are configured to perform the functions of the various embodiments of the present invention.

[0074] A program / utility 524 having a set (at least one) of program modules 5241 may be stored, for example, in the memory 52, such program modules 5241 including but not limited to an operating system, one or more application programs, other program modules, and program data, each of which or some combination thereof may include an implementation of a network environment. The program modules 5241 generally perform the functions and / or methods of the embodiments described herein.

[0075] The satellite may also communicate with one or more external devices (e.g., keyboards, pointing devices, displays, etc.), one or more devices that enable a user to interact with the satellite, and / or any device that enables the satellite to communicate with one or more other computing devices (e.g., network cards, modems, etc.). Such communications may occur via input / output (I / O) interface 54. Furthermore, the satellite may also communicate with one or more networks (e.g., local area networks (LANs), wide area networks (WANs), and / or public networks such as the Internet) via network adapter 55. Figure 5 As shown, the network adapter 55 communicates with other modules of the satellite via the bus 53. It should be understood that although not shown in the figure, other hardware and / or software modules can be used in conjunction with the satellite, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0076] In one embodiment, the satellite-to-ground communication system based on the assistance of the intelligent metasurface of the present invention includes a ground user, an intelligent metasurface and the above-mentioned satellite. The intelligent metasurface is used to establish an auxiliary link between the satellite and the ground user. Through the beam reconstruction characteristics of the intelligent metasurface, the satellite signal strength received by the ground user can be effectively controlled, and then services can be provided to users in different areas based on different satellite coverage control and switching joint optimization strategies.

[0077] In summary, the satellite-to-ground communication method, system, medium, and satellite based on the assistance of intelligent metasurface of the present invention control the satellite signal strength in a specific area within a specific time through the intelligent metasurface, reduce the number of user satellite / beam switching caused by the change of satellite beam coverage for specific ground users, and control the co-frequency interference between beams and between satellites; through the joint optimization of intelligent metasurface beam reconstruction and satellite switching, the overall performance of multiple ground users within the specific coverage of the satellite is improved. Therefore, the present invention effectively overcomes various shortcomings in the prior art and has a high industrial utilization value.

[0078] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A satellite-to-ground communication method based on intelligent metasurface assistance, applied to satellites, characterized by: The method comprises the following steps: Establish auxiliary links with ground users based on smart metasurfaces; Obtaining the beam coverage of the satellite; Due to the movement of the satellite, when the ground user changes from within the beam coverage to outside the beam coverage, the intelligent metasurface is controlled to achieve satellite beam coverage control and switching optimization.

2. The satellite-to-ground communication method based on the assistance of intelligent metasurface according to claim 1, characterized in that: Due to the movement of the satellite, when the ground user changes from within the beam coverage to outside the beam coverage, controlling the smart metasurface to achieve satellite beam coverage control and switching optimization includes the following steps: When the ground user has other visible satellites and the signal strength of the other visible satellites meets the needs of the ground user, the reflection coefficient of the smart metasurface is adjusted, and the satellite signal strength received by the ground user is reduced based on the auxiliary link, so that the satellite signal strength is less than the switching signal strength to prevent the ground user from accessing the satellite; When the ground user has no other visible satellites, the reflection coefficient of the intelligent metasurface is adjusted to enhance the satellite signal strength received by the ground user based on the auxiliary link so that the satellite signal strength is greater than the switching signal strength to maintain the communication connection between the satellite and the ground user.

3. The satellite-to-ground communication method based on the assistance of intelligent metasurface according to claim 2 is characterized in that: The satellite adjusts the satellite signal strength by controlling the array element parameters of the smart metasurface.

4. A satellite-to-ground communication system based on intelligent metasurface assistance, applied to satellites, characterized by: The system includes a building module, an acquisition module and a control module; The establishing module is used to establish an auxiliary link with a ground user based on the intelligent metasurface; The acquisition module is used to acquire the beam coverage of the satellite; The control module is used to control the intelligent metasurface to realize satellite beam coverage control and switching optimization when the ground user changes from within the beam coverage to outside the beam coverage due to the movement of the satellite.

5. A storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the satellite-to-earth communication method based on the assistance of intelligent metasurface described in any one of claims 1 to 3 is implemented.

6. A satellite, characterized in that: include: Processor and memory; The memory is used to store computer programs; The processor is used to execute the computer program stored in the memory so that the electronic device executes the satellite-to-earth communication method based on the assistance of smart metasurface as described in any one of claims 1 to 3.

7. A satellite-to-ground communication system assisted by an intelligent metasurface, characterized in that: comprising a ground user, a smart metasurface and the satellite of claim 6; The intelligent metasurface is used to establish an auxiliary link between the satellite and the ground user.

8. The satellite-to-ground communication system based on intelligent metasurface assistance according to claim 7 is characterized in that: The smart metasurface can serve multiple ground users simultaneously.

9. The satellite-to-ground communication system based on intelligent metasurface assistance according to claim 7 is characterized in that: The working mode of the smart metasurface is a transmission mode, a reflection mode or a simultaneous transmission and reflection mode, and the smart metasurface works in a passive mode or an active mode.

10. The satellite-to-ground communication system based on intelligent metasurface assistance according to claim 7, characterized in that: The ground users can access multiple satellites simultaneously.

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