Multi-beam seamless switching demonstration verification system

Abstract

The invention discloses a multi-beam seamless switching demonstration verification system, and relates to the field of satellite-ground communication simulation. The system comprises at least two vector signal sources used for simulating and outputting pseudo satellite emission signals; the satellite-ground wireless channel simulator is used for receiving the pseudo-satellite emission signal, processing the pseudo-satellite emission signal according to the analog channel model parameters and outputting a simulation signal; the at least two horn antennas are used for simulating satellite earth coverage wave beams, receiving simulation signals and outputting the simulation signals in a directional wave beam form; the service terminal carries a transceiving common-caliber phased-array antenna and is used for adjusting arrival beam receiving gains in different directions and adjusting a transmitting beam direction angle and gains so as to transmit signals; the frequency spectrograph is used for observing the received signal; and the upper computer is used for outputting analog channel model parameters, and is also used for controlling angle pointing and beam pointing switching of the transceiving common-caliber phased-array antenna. Compared with the prior art, the phased-array antenna communication process among multiple orbits, multiple satellites and satellite-ground coverage areas can be simulated quickly, truly and accurately.

Description

Technical Field

[0001] The present invention relates to the technical field of satellite-to-ground communication simulation technology, and more specifically, to a multi-beam seamless switching demonstration and verification system. Background Art

[0002] At present, satellite communication systems have become an important part of the world's telecommunications structure, providing telephone, data, video and other services to countries around the world. In my country, satellite communication technology plays an irreplaceable role, especially in remote areas such as mountainous areas and sea areas, disaster areas, ocean-going fleets and other areas where land communications are difficult to cover. Compared with traditional C-band and Ku-band communication satellites, Ka-band large-capacity multimedia communication satellites have technical advantages such as multiple beams, wide available frequency bands, frequency reuse, and high single-point beam gain. The system capacity is ten or even a hundred times higher than that of traditional systems. The Ka high-throughput satellite communication system based on Ka-band large-capacity multimedia satellites can reduce the cost of using satellite communication unit bandwidth, while users can also get a better application experience.

[0003] Each spot beam of the Ka-band large-capacity multimedia communication satellite only covers a regional space, and adjacent spot beams will have some overlapping areas. When the satellite terminal is used during movement, it faces the situation of crossing the coverage area of ​​multiple beams, and it is necessary to ensure that the communication service is not interrupted when switching across beams. At the same time, the orbital period of low-orbit satellites is short, and the coverage range of satellite beams to the ground is limited. The terminal faces the situation where multiple satellites are needed to jointly ensure communication. The terminal antenna needs to switch across satellites, and cross-satellite switching is essentially a cross-beam switching. The cross-satellite and cross-beam tracking and switching capabilities of the terminal antenna directly determine the satellite communication effect, and this capability needs to be tested and verified during the antenna design and production process. However, research on Ka-band large-capacity multimedia satellite communication systems has problems such as high cost, long design and testing process, and difficulty in predicting and optimizing performance. Summary of the invention

[0004] In order to overcome the defects of the above-mentioned prior art, such as high cost and difficulty in predicting and optimizing performance, the present invention provides a multi-beam seamless switching demonstration and verification system.

[0005] In order to solve the above technical problems, the technical solution of the present invention is as follows:

[0006] A multi-beam seamless switching demonstration and verification system, comprising:

[0007] At least two vector signal sources, used for simulating and outputting pseudo-satellite transmission signals;

[0008] A satellite-to-ground wireless channel simulator, configured to receive the pseudo-satellite transmission signal, process the pseudo-satellite transmission signal according to the simulation channel model parameters to simulate the satellite-to-ground channel environment, and output a simulation signal;

[0009] At least two horn antennas are used to simulate the satellite's ground coverage beam, and refer to the geographical location information of the satellite's spot beam in the preset beam library to adjust the horn antenna spacing and beam angle to make it as close as possible to the actual satellite antenna ground coverage state; and are also used to receive the simulated signal and output it in a corresponding directional beam;

[0010] A service terminal is equipped with a transmit-receive co-aperture phased array antenna that cooperates with the horn antenna to realize beam switching, and is used to adjust the receiving gain of the arrival beam in different directions according to a preset beam control algorithm, and is also used to adjust the direction angle and gain of the transmission beam to transmit the signal;

[0011] A spectrum analyzer, used to observe the signal received at the service terminal;

[0012] The host computer is used to output the simulated channel model parameters and to control the angle pointing and beam pointing switching of the transmitting and receiving co-aperture phased array antenna.

[0013] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0014] The present application discloses a multi-beam seamless switching demonstration and verification system, which can simulate the phased array antenna communication process between multiple orbits, multiple satellites, and satellite-to-ground coverage areas more quickly, realistically, and accurately, effectively reducing the high cost of actual satellite-to-satellite testing and verification of phased array antennas, and providing a verification environment support for promoting the optimization and improvement of phased array antenna technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of a multi-beam seamless switching demonstration and verification system in an embodiment of the present application;

[0016] Figure 2 This is a schematic diagram of the beam switching process in an embodiment of the present application;

[0017] Figure 3 This is a schematic diagram of the cross-beam algorithm flow in an embodiment of the present application;

[0018] Figure 4 It is a flowchart of the mobile switching process of the vehicle-mounted phased array user terminal in the embodiment of the present application;

[0019] Figure 5 This is a hardware architecture diagram of the satellite-to-ground wireless channel simulator in an embodiment of the present application;

[0020] Figure 6 A software architecture diagram of the wireless channel simulation system software in an embodiment of the present application;

[0021] Figure 7This is a schematic diagram of the structure of the satellite-to-ground wireless channel simulator in an embodiment of the present application that expands the coverage frequency range through a frequency conversion component;

[0022] Figure 8 A schematic diagram of a flow chart of generating a wireless channel simulation sample in an embodiment of the present application;

[0023] Fig. 9 A schematic diagram of the main contents of the channel simulation implemented by the satellite-to-ground wireless channel simulator in an embodiment of the present application;

[0024] Fig.10 This is a schematic diagram of a simulation scene interface of a satellite-to-ground wireless channel simulator in an embodiment of the present application;

[0025] Fig.11 Schematic diagram of the remote control interface of the satellite-to-ground wireless channel simulator in an embodiment of the present application. DETAILED DESCRIPTION

[0026] The terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged in appropriate cases, which is only to describe the distinction mode adopted by the objects of the same attributes in the embodiments of the present application when describing. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, so that the process, method, system, product or equipment containing a series of units need not be limited to those units, but may include other units that are not clearly listed or inherent to these processes, methods, products or equipment. The term "determine" widely covers various actions, and may include acquisition, calculation, calculation, processing, derivation, investigation, search (for example, search in a table, database or other data structure), ascertainment, and similar actions, and may also include reception (for example, receiving information), access (for example, accessing data in a memory) and similar actions, and may also include generation, creation, establishment and similar actions, as well as parsing, selection, selection and similar actions, etc. The relevant definitions of other terms will be given in the following description.

[0027] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element, or connected to the other element through an intermediate element. In addition, the "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc. if there is transmission of electrical signals or data between the connected objects.

[0028] The drawings are for illustrative purposes only and should not be construed as limiting the present patent;

[0029] In order to better illustrate the present embodiment, some parts in the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product;

[0030] It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0031] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0032] This embodiment provides a multi-beam seamless switching demonstration and verification system. Figure 1 ,include:

[0033] Two vector signal sources for simulating and outputting pseudo-satellite transmission signals;

[0034] A satellite-to-ground wireless channel simulator (i.e., a satellite communication wireless channel simulator) is used to receive the pseudo-satellite transmission signal, process the pseudo-satellite transmission signal according to the simulation channel model parameters to simulate the satellite-to-ground channel environment, simulate the process of the pseudo-satellite transmission signal being transmitted to the ground terminal via space and derive relevant wireless channel characteristic parameters, and output a simulation signal;

[0035] Two horn antennas are used to simulate the satellite's ground coverage beam, and refer to the geographical location information of the satellite's spot beam in the preset beam library to adjust the horn antenna spacing and beam angle to make it as close as possible to the actual satellite antenna ground coverage state; they are also used to receive the simulated signal and output it in a corresponding directional beam;

[0036] The service terminal (i.e., carrier) is equipped with a transmit-receive co-aperture phased array antenna (i.e., terminal phased array antenna) that cooperates with the horn antenna to realize beam switching, and is used to adjust the receiving gain of the arrival beam in different directions according to a preset beam control algorithm, and is also used to adjust the direction angle and gain of the transmission beam to transmit the signal;

[0037] A spectrum analyzer, used to observe the signal received at the service terminal;

[0038] The host computer (which may be a server) is used to output the simulated channel model parameters and to control the angle pointing and beam pointing switching of the transmitting and receiving co-aperture phased array antenna.

[0039] The multi-beam seamless switching demonstration and verification system disclosed in this embodiment can be used to simulate cross-satellite switching and intra-satellite cross-beam switching. It can more quickly, realistically and accurately simulate the phased array antenna communication process between multiple orbits, multiple satellites, and satellite-to-ground coverage areas, effectively reducing the high cost of actual satellite-to-satellite testing and verification of phased array antennas, and providing a verification environment support for promoting the optimization and improvement of phased array antenna technology.

[0040] In some preferred embodiments, the spectrum data observed by the spectrometer is entered into the host computer.

[0041] Those skilled in the art should understand that in actual simulation experiments, a larger number of vector signal sources, horn antennas and / or service terminals may be used to simulate more complex satellite-to-ground communication scenarios.

[0042] In some preferred embodiments, see Figure 2 , the beam switching includes:

[0043] The two vector signal sources are respectively used to simulate corresponding pseudo-satellite transmission signals, which are processed by the satellite-to-ground wireless channel simulator to simulate the attenuation, delay, Doppler frequency shift and other characteristics of the satellite transmission signals when they reach the ground service terminal, and the processed simulation signals are sent to the horn antenna;

[0044] The two horn antennas are used to simulate the satellite ground coverage beam, and the geographical location information of the satellite spot beam in the preset beam library is referred to, and the horn antenna spacing and beam angle are adjusted, and the simulation signal is output in a directional beam mode, so as to make it as close as possible to the actual satellite antenna ground coverage state;

[0045] When the transmitting and receiving co-aperture phased array antenna is operating normally, reading the signal outputted by the transmitting and receiving co-aperture phased array antenna to the spectrum analyzer to ensure normal identification of pseudolite transmission signals;

[0046] Acquire the preset current carrier location information of the service terminal, and compare the carrier location information with the geographical location information of the spot beam of the satellite in the preset beam library to obtain the coverage of the current beam;

[0047] According to the coverage of the current beam, the geographical location information of the spot beam of the satellite in the preset beam library and the preset movement heading information of the service terminal, it is determined whether the next position is still within the coverage of the current satellite: if so, perform a cross-beam operation; otherwise, perform a cross-satellite operation;

[0048] The spectrum analyzer is used to observe the signal output by the transmitting and receiving co-aperture phased array antenna to determine the beam switching situation.

[0049] It should be understood that the beam switching includes cross-satellite switching and intra-satellite cross-beam switching.

[0050] In some alternative embodiments, see Figure 3 , the cross-beam operation includes:

[0051] Determine next beam information according to the motion heading information and the geographical location information about the spot beam of the satellite in the preset beam library;

[0052] According to the next beam information, by adjusting the position of the horn antenna, the beam pointing angle, and the relative position between the horn antenna and the transmitting and receiving co-aperture phased array antenna, the relative position change process between the service terminal and the satellite during movement is simulated;

[0053] During the simulation of the relative position change of the service terminal, the current carrier position is repeatedly compared with the carrier position information to see whether it is within the coverage of the current beam: if so, no operation is performed; otherwise, the phase shifter is configured to adjust the polarization according to the next beam information to perform beam switching.

[0054] Furthermore, the cross-beam operation also includes: when the current carrier position is not within the coverage of the current beam, synchronously changing the receiver and converter frequency of the service terminal to achieve beam switching.

[0055] In some optional embodiments, the inter-satellite operation includes:

[0056] Adjusting the beam pointing of the transmitting and receiving co-aperture phased array antenna according to the simulated geographic location information of the current satellite and the next satellite so as to point to the current satellite and the next satellite respectively;

[0057] Acquire two AGC values ​​corresponding to the current satellite and the next satellite respectively in the receiver channel of the service terminal, set the downconverter frequency of the service terminal to the frequency of the satellite with a higher AGC value, and perform beam switching.

[0058] It should be understood that whether the carrier has completed the inter-satellite operation can be determined based on the AGC value and the current position of the carrier.

[0059] The service terminal must be able to accurately track low-orbit satellites to ensure the continuity of the communication link. After a satellite leaves the coverage area of ​​the terminal antenna, the antenna needs to be able to quickly align the beam to the next satellite so that it can complete the inter-satellite switching between different satellites in the shortest possible time. Therefore, continuous and jumpable adjustment of the beam pointing is required. In some preferred embodiments, the co-aperture phased array antenna for transmission and reception uses the phase of the radiation wave of the electronic control unit to achieve beam scanning, which is not limited by mechanical inertia and has an extremely fast switching time, which meets the needs of low-orbit satellite ground terminals. The switching process is as follows: Figure 4 shown.

[0060] It can be understood that the channel simulator can simulate the channel of the wireless communication system as close to reality as possible in the laboratory in an approximate manner; the introduction of the channel simulator in the test of the terminal equipment can build the required channel environment in the laboratory, conduct reproducible testing, reduce the scale and number of field experiments, and improve design efficiency. Based on this understanding, the satellite-to-ground wireless channel simulator mainly completes the functions of RF signal conditioning, ADC / DAC conversion, baseband signal processing, interference generation, data exchange, power supply management, frequency synthesis control, up and down conversion, etc.

[0061] In some preferred embodiments, see Figure 5 , the satellite-to-ground wireless channel simulator comprises:

[0062] A frequency conversion module, used for performing up and down frequency conversion processing on the pseudo-satellite transmission signal;

[0063] A signal processing module (signal processing board), used for performing radio frequency signal conditioning, ADC / DAC conversion and baseband signal processing on the pseudo-satellite transmission signal;

[0064] A frequency synthesis module, used to realize frequency synthesis control of the pseudo-satellite transmission signal;

[0065] A main control module (main control board), used for receiving the simulated channel model parameters and for configuring the frequency conversion module, the signal processing module and the frequency synthesis module to simulate the corresponding satellite-to-ground channel environment;

[0066] Power control module, used for power supply management.

[0067] It can be understood that the satellite-to-ground wireless channel simulator may also include a backplane for implementing data exchange.

[0068] In some specific implementations, the satellite-to-ground wireless channel simulator is equipped with a wireless channel simulation system software to achieve human-computer interaction, including a channel simulator main control software running on a main control board and a firmware running in an FPGA to execute a wireless channel simulation algorithm. Figure 6 As shown, the corresponding interaction results are displayed on the display.

[0069] In some optional embodiments, the frequency conversion module includes a high-frequency frequency converter supporting multiple-input and multiple-output.

[0070] It should be noted that the high-frequency converter corresponding to the covered frequency range is selected according to the satellite communication frequency range requirement during simulation.

[0071] In some specific implementations, the high frequency converter covers a frequency band of 18 GHz-40 GHz.

[0072] In some specific implementations, a high-frequency converter module that supports 2-input and 2-output bidirectional real-time communication in the high-frequency band of 18GHz to 40GHz (i.e., 2 transmit and 2 receive above 18GHz) is used. The maximum real-time communication bandwidth can reach 500M, thus meeting more satellite communication test scenarios. Figure 7 It should be noted that Figure 7 Some functional modules are omitted, and the structure shown supports the unit composition of high-frequency frequency expansion. The high-frequency inverter module can be integrated in the device or connected to the outside of the device in an external form. The high-frequency inverter module can be expanded to support satellite communication frequency bands such as Ku and Ka.

[0073] Those skilled in the art should understand that the frequency conversion module may further include a down converter to achieve up and down conversion between 400 MHz to 6 GHz and 18 GHz to 40 GHz.

[0074] In some other specific implementations, the high frequency converter covers the Ku frequency band.

[0075] In some preferred embodiments, the simulation channel model parameters include at least simulation scenario parameters, large-scale fading parameters and small-scale fading parameters.

[0076] In some optional embodiments, the process of generating the simulated channel model parameters includes:

[0077] Acquire simulation scene geometry parameters, network topology and antenna parameters about the simulation scene network layout as the simulation scene parameters;

[0078] Set up the communication environment;

[0079] According to the set propagation environment, the corresponding path loss model is selected to calculate the path loss and generate relevant large-scale fading parameters;

[0080] According to the large-scale fading parameter and the probability density function, in combination with the simulation scenario parameters, each of the small-scale fading parameters is generated in sequence;

[0081] Calculate the channel coefficients and add path loss and shadow fading according to simulation requirements.

[0082] Those skilled in the art should understand that different channel models correspond to different channel sample (i.e., simulated channel model parameter) generation processes, and those skilled in the art can flexibly adjust and set the simulated channel model parameters according to actual needs, which cannot be listed here one by one.

[0083] In this embodiment, the general process of generating random channel samples is designed with reference to the 3GPP 3D channel model. Figure 8 ,include:

[0084] (1) Set simulation scenario, network topology, and antenna array parameters

[0085] Simulation scenario parameter definition: configure simulation scenario parameters about the simulation scenario network layout (such as satellite orbit parameters, ground station locations, climate parameters, etc.);

[0086] (2) Setting up the communication environment

[0087] Configure propagation conditions LOS (Line of Sight) / NLOS (Non Line of Sight);

[0088] (3) Calculate path loss and generate large-scale fading parameters

[0089] Configure a path loss model PL (Path Loss); calculate the path loss according to the simulation scenario network layout, the propagation conditions and the configured path loss model, and generate large-scale fading parameters DS (Delay Spread, delay spread parameter), AS (Angular Spread, angle spread parameter, including ASD (Azimuth angle Spread of Departure, departure azimuth spread parameter), ASA (Azimuth angle Spread of Arrival, arrival azimuth spread parameter), ZSD (Zenith angle Spread of Departure, departure zenith angle spread parameter) and / or ZSA (Zenith angle Spread of Arrival, arrival zenith angle spread parameter)), SF (Shadow Fading, shadow fading parameter), K (LOS gain parameter, K factor);

[0090] (4) Generate small-scale fading parameters

[0091] Small-scale fading parameter generation: configure multipath delay τ, cluster power Pn, arrival angle and departure angle AOD (Azimuthangle of Departure), AOA (Azimuth angle of Arrival), ZOD (Zenith angle of Departure), ZOA (Zenith angle of Arrival), perform random coupling of rays, and generate XPR (Cross-Polarization Ratio);

[0092] (5) Calculate channel coefficients

[0093] Channel coefficient generation: Generate random initial phases for multipath components; generate channel coefficients based on small-scale fading parameters and random initial phases, and add path loss and shadow fading to the channel according to the simulation scenario;

[0094] Considering the interaction between antennas, antenna coupling is performed in combination with the above parameters.

[0095] It should be understood that the satellite-to-ground wireless channel simulator is ultimately intended to achieve large-scale fading simulation, small-scale fading simulation, shadow simulation, and other simulations for pseudo-satellite transmission signals. Specifically, in the process of satellite mobile communication, the link from the transmitter to the receiver can be roughly divided into two processes in theory, such as Fig. 9 As shown in the figure, the space propagation process from satellite to terminal and the ground mobile propagation process. In the space propagation process, the signal will be affected by channel characteristics such as propagation attenuation, delay, and Doppler frequency shift. In the ground propagation process, the signal is mainly affected by shadow fading caused by ground obstacles and multipath fading caused by surrounding scatterers.

[0096] In some specific implementation processes, simulation scenarios are implemented based on STK (Satellite Tool Kit) secondary development to achieve satellite channel simulation. STK remote control software is deployed on the host computer and connected to the satellite-to-ground wireless channel simulator via a network cable. Its interactive interface is as follows: Fig.10 The simulation software includes a scene loading module, a scene running module and a data transmission module; wherein the scene loading module realizes the creation and loading of scenes, the scene running module realizes the running, pausing, returning and rewinding of scenes, and the data transmission module realizes the data transmission with the channel simulator.

[0097] More specifically, the remote control software operation steps are as follows:

[0098] (1) Power on the satellite-to-ground wireless channel simulator and run the remote control software of the host computer;

[0099] (2) Connect the satellite-to-ground wireless channel simulator to the local area network where the control terminal (host computer) is located, and they can ping each other;

[0100] (3) The control end prepares the various parameter configurations of the model to be simulated, such as the number of satellite stations and ground stations, the number of antennas at each station, model type, shadowing type, etc. Fig.11 ;

[0101] (4) The control end uses commands such as "MODEL:SHADowing:CREAte", "MODEL:SCENario:CREAte", and "MODEL:BIN:CREAte" to create a scenario model configuration file and generate a channel model coefficient data bin file, thereby completing the generation of simulation channel model parameters;

[0102] (5) After the simulation channel model parameters are successfully generated, the control end uses "EMUlate:OPEN" to load the channel model coefficient data bin file generated in the previous step, and then uses "EMUlate:START" to enable channel model simulation;

[0103] (6) During the simulation startup process, the control end can send the "EMUlate:STATE?" command to query the startup status;

[0104] (7) After the simulation is fully started successfully, the control end can send relevant instructions to configure the input power and output power parameters;

[0105] (8) After the test is completed, the control end sends the "EMUlate:STOP" command to stop the simulation, and then sends the "EMUlate:STATE?" command to query the simulation stop status;

[0106] (9) Close the remote control software, then shut down the computer and power off.

[0107] This embodiment also provides a computer-readable storage medium, on which is stored at least one instruction, at least one program, code set or instruction set, and the at least one instruction, at least one program, code set or instruction set is loaded and executed by a processor, so that the processor performs some or all of the steps of the method provided in the above embodiment.

[0108] It is understood that the storage medium may be transient or non-transient. Exemplarily, the storage medium includes, but is not limited to, a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and other media that can store program codes.

[0109] Exemplarily, the processor may be a central processing unit (CPU), a microprocessor (MPU), a digital signal processor (DSP), or a field programmable gate array (FPGA).

[0110] Exemplarily, the read-only memory includes but is not limited to MASK ROM, PROM, EPROM, EEPROM, Flash, etc.

[0111] Exemplarily, the random access memory includes but is not limited to DRAM, SRAM, SDRAM, DDR SDRAM, etc.

[0112] In some examples, a computer program product is provided, which can be implemented in hardware, software or a combination thereof. As a non-limiting example, the computer program product can be embodied as the storage medium, or as a software product, such as an SDK (Software Development Kit).

[0113] As a non-limiting example, a computer program product is provided, the computer program product includes a computer program or a computer executable instruction, the computer program or the computer executable instruction is stored in a computer-readable storage medium. A processor of an electronic device reads the computer program or the computer executable instruction from the computer-readable storage medium, and the processor executes the computer executable instruction, so that the electronic device performs some or all steps of the method described in the embodiment of the present application.

[0114] In some examples, a computer program is provided, including a computer-readable code. When the computer-readable code is run in a computer device, a processor in the computer device executes some or all of the steps for implementing the above-mentioned operation method.

[0115] This embodiment also proposes an electronic device, including a memory and a processor, wherein the memory stores at least one instruction, at least one program, a code set or an instruction set, and when the processor executes the at least one instruction, at least one program, a code set or an instruction set, it implements part or all of the steps of the aforementioned method.

[0116] In some examples, a hardware entity of the electronic device is provided, including: a processor, a memory and a communication interface; wherein the processor generally controls the overall operation of the electronic device; the communication interface is used to enable the electronic device to communicate with other terminals or servers through a network; the memory is configured to store instructions and applications executable by the processor, and can also cache data to be processed or processed by the processor and various modules in the electronic device (including but not limited to image data, audio data, voice communication data and video communication data), which can be implemented by flash memory (FLASH), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM) or random access memory (RAM).

[0117] The processor may include one or more processing elements. Thus, the processor may include one or more integrated circuits (ICs) configured to perform the functions of the processor. In addition, each integrated circuit may include a circuit (e.g., a first circuit, a second circuit, and other circuits, etc.) configured to perform the functions of the processor.

[0118] Furthermore, data may be transmitted between the processor, the communication interface and the memory via a bus, which may include any number of interconnected buses and bridges, and the bus connects various circuits of one or more processors and memories together.

[0119] The same or similar reference numerals correspond to the same or similar components;

[0120] The terms used to describe the positional relationship in the drawings are only used for illustrative purposes and should not be construed as limiting the present application;

[0121] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0122] In different specific implementations, the method or system described in the present application can be implemented in software, hardware or a combination thereof. In addition, the order of the steps of the method can be changed, and various elements can be added, reordered, combined, omitted, modified, etc.

[0123] Obviously, the above-mentioned embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the implementation methods of the present application, and are not intended to limit the present application. For those of ordinary skill in the art, other different forms of changes or modifications can be made on the basis of the above description. Each discrete structure / function module or unit can be integrated together to form an independent part, or each module can exist separately, or two or more modules can be integrated to form an independent part, and the structure and function of the discrete components can be implemented as a combined structure or component. It is not necessary and impossible to enumerate all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the scope of protection of the claims of the present application.

Claims

1. A multi-beam seamless switching demonstration and verification system, characterized in that: include: At least two vector signal sources, used for simulating and outputting pseudo-satellite transmission signals; A satellite-to-ground wireless channel simulator, configured to receive the pseudo-satellite transmission signal, process the pseudo-satellite transmission signal according to the simulation channel model parameters to simulate the satellite-to-ground channel environment, and output a simulation signal; At least two horn antennas are used to simulate the satellite's ground coverage beam, and refer to the geographical location information of the satellite's spot beam in the preset beam library to adjust the horn antenna spacing and beam angle to make it as close as possible to the actual satellite antenna ground coverage state; and are also used to receive the simulated signal and output it in a corresponding directional beam; A service terminal is equipped with a transmit-receive co-aperture phased array antenna that cooperates with the horn antenna to realize beam switching, and is used to adjust the receiving gain of the arrival beam in different directions according to a preset beam control algorithm, and is also used to adjust the direction angle and gain of the transmission beam to transmit the signal; A spectrum analyzer, used to observe the signal received at the service terminal; The host computer is used to output the simulated channel model parameters and to control the angle pointing and beam pointing switching of the transmitting and receiving co-aperture phased array antenna.

2. A multi-beam seamless switching demonstration and verification system according to claim 1, characterized in that: The beam switching includes: The at least two vector signal sources are respectively used to simulate corresponding pseudo-satellite transmission signals, which are processed by the satellite-to-ground wireless channel simulator to simulate the attenuation, delay, Doppler frequency shift and other characteristics of the satellite transmission signals when they reach the ground service terminal, and the processed simulation signals are sent to the horn antenna; The horn antenna is made to simulate the satellite ground coverage beam, and the geographical location information of the satellite spot beam in the preset beam library is referred to, the horn antenna spacing and beam angle are adjusted, and the simulation signal is output in a directional beam mode, so as to make it as close as possible to the actual satellite antenna ground coverage state; When the transmitting and receiving co-aperture phased array antenna is operating normally, reading the signal outputted from the transmitting and receiving co-aperture phased array antenna to the spectrum analyzer to ensure normal identification of pseudolite transmission signals; Acquire the preset current carrier location information of the service terminal, and compare the carrier location information with the geographical location information of the spot beam of the satellite in the preset beam library to obtain the coverage of the current beam; According to the coverage of the current beam, the geographical location information of the spot beam of the satellite in the preset beam library and the preset movement heading information of the service terminal, it is determined whether the next position is still within the coverage of the current satellite: if so, perform a cross-beam operation; otherwise, perform a cross-satellite operation; The spectrum analyzer is used to observe the signal output by the transmitting and receiving co-aperture phased array antenna to determine the beam switching situation.

3. A multi-beam seamless switching demonstration and verification system according to claim 2, characterized in that: The cross-beam operation includes: Determine next beam information according to the motion heading information and the geographical location information about the spot beam of the satellite in the preset beam library; According to the next beam information, by adjusting the position of the horn antenna, the beam pointing angle, and the relative position between the horn antenna and the transmitting and receiving co-aperture phased array antenna, the relative position change process between the service terminal and the satellite during movement is simulated; During the simulation of the relative position change of the service terminal, the current carrier position is repeatedly compared with the carrier position information to see whether it is within the coverage of the current beam: if so, no operation is performed; otherwise, the phase shifter is configured to adjust the polarization according to the next beam information to perform beam switching.

4. A multi-beam seamless switching demonstration and verification system according to claim 3, characterized in that: The cross-beam operation also includes: when the current carrier position is not within the coverage of the current beam, synchronously changing the receiver and converter frequency of the service terminal to achieve beam switching.

5. A multi-beam seamless switching demonstration and verification system according to claim 2, characterized in that: The inter-satellite operation includes: Adjusting the beam pointing of the transmitting and receiving co-aperture phased array antenna according to the simulated geographic location information of the current satellite and the next satellite so as to point to the current satellite and the next satellite respectively; Acquire two AGC values ​​corresponding to the current satellite and the next satellite respectively in the receiver channel of the service terminal, set the downconverter frequency of the service terminal to the frequency of the satellite with a higher AGC value, and perform beam switching.

6. A multi-beam seamless switching demonstration and verification system according to claim 1, characterized in that: The transmitting and receiving co-aperture phased array antenna realizes beam scanning by using the phase of the radiation wave of the electronic control unit.

7. A multi-beam seamless switching demonstration and verification system according to claim 1, characterized in that: The satellite-to-ground wireless channel simulator comprises: A frequency conversion module, used for performing up and down frequency conversion processing on the pseudo-satellite transmission signal; A signal processing module, used for performing radio frequency signal conditioning, ADC / DAC conversion and baseband signal processing on the pseudo-satellite transmission signal; A frequency synthesis module, used to realize frequency synthesis control of the pseudo-satellite transmission signal; A main control module, used for receiving the simulated channel model parameters and for configuring the frequency conversion module, the signal processing module and the frequency synthesis module to simulate the corresponding satellite-to-ground channel environment; Power control module, used for power supply management.

8. A multi-beam seamless switching demonstration and verification system according to claim 7, characterized in that: The frequency conversion module includes a high frequency converter supporting multiple input and multiple output.

9. A multi-beam seamless switching demonstration and verification system according to any one of claims 1 to 8, characterized in that: The simulation channel model parameters at least include simulation scenario parameters, large-scale fading parameters and small-scale fading parameters.

10. A multi-beam seamless switching demonstration and verification system according to claim 9, characterized in that: The generation process of the simulated channel model parameters includes: Acquire simulation scene geometry parameters, network topology and antenna parameters about the simulation scene network layout as the simulation scene parameters; Set up the communication environment; According to the set propagation environment, the corresponding path loss model is selected to calculate the path loss and generate relevant large-scale fading parameters; According to the large-scale fading parameter and the probability density function, in combination with the simulation scenario parameters, each of the small-scale fading parameters is generated in sequence; Calculate the channel coefficients and add path loss and shadow fading according to simulation requirements.

Images