CN118338335A - Satellite network digital prototype construction method and device based on digital twin - Google Patents

Abstract

The invention belongs to the field of satellite network system digital modeling, and particularly relates to a satellite network digital prototype construction method and device based on digital twinning. The method comprises the following steps: constructing a communication protocol stack through a digital twin technology according to each layer of protocols of satellite network communication; constructing a basic model library; constructing a network simulation module; and forming the satellite network digital prototype by combining the simulation engine with the communication protocol stack, the basic model library and the network simulation module. The invention realizes the digital modeling of key nodes and protocol functions of the satellite network, can construct a network system digital prototype, and reflects the relation among the satellite network protocol functions, processes and efficiency; the information interaction and networking system of the constellation network can be simulated, and the service efficiency and the network function are analyzed and verified; the device can be connected and mapped with physical equipment through a semi-physical simulation interface of the digital prototype device, and has the capability of testing and verifying key network equipment.

Description

Satellite network digital prototype construction method and device based on digital twin

Technical Field

The invention belongs to the field of satellite network system digital modeling, and particularly relates to a satellite network digital prototype construction method and device based on digital twinning.

Background

Along with the gradual expansion of the application range of satellites in navigation, remote sensing, low-orbit communication and other systems, the types of satellites, the scale and the complexity of the systems are rapidly increased, and the networking interconnection requirements inside satellite constellations, between satellites and between constellations are also greatly increased. In the design and construction of an actual satellite network, because of the problems of network scale increase, inter-satellite/satellite topology time-varying, complex information hinge relationship and the like, a network digital prototype needs to be constructed through a digital twin network technology, the protocol flow, inter-satellite communication and service transmission efficiency of the complex satellite network are simulated efficiently and accurately, and platform support is provided for the system and the protocol design.

Digital twinning-based satellite network digital prototype refers to a technology for digitally creating virtual images of actual satellite network functional entities and mapping with physical network entities in real time. The digital twin technology is applied to a satellite network, a digital twin satellite network model machine which is consistent with network elements, interfaces and information of the entity satellite network is built, and the satellite network can be assisted to realize low-cost trial-and-error, intelligent decision and high-efficiency innovation by means of real-time interaction and mutual influence of a physical network and the twin network, so that the satellite network is greatly promoted to realize intelligent operation and maintenance. Based on the digital twin of each satellite in the satellite constellation, and combining a ground base station model, an inter-satellite link model, a network topology model, a network protocol model, a space environment model and the like of a satellite network and data of an in-orbit satellite and the network, a digital twin satellite network model is formed, and mapping of a satellite constellation system and satellite network protocol behaviors in space is realized.

Aiming at projects such as satellite Internet, certain digitization work is carried out by each domestic unit, but the defects or problems of low digitization degree of partial systems, weak information interaction capability among systems, poor model evolution and data association capability among processes and the like still exist in the whole life cycle of satellite engineering. Meanwhile, the international satellite industry has a trend of developing a fusion with a new generation of information technology represented by cloud computing, the internet of things, big data, blockchains, artificial intelligence and the like. The method and the device for constructing the satellite network prototype based on digital twinning are deeply researched, so that the technical strength of a research and development platform of a complex satellite system can be enhanced.

The invention mainly aims at a complex satellite network system, and provides a method and a device for constructing a satellite network digital prototype based on a digital twin technology.

Disclosure of Invention

The invention aims to provide a satellite network digital prototype construction method and device based on digital twinning, which can establish a mapping model of a satellite network system and a ground digital twinning satellite network.

The technical scheme adopted by the invention is as follows:

a satellite network digital prototype construction method based on digital twinning comprises the following steps:

constructing a communication protocol stack through a digital twin technology according to each layer of protocols of satellite network communication;

abstract modeling is carried out on network nodes, network topology and network protocols, and a basic model library is constructed;

constructing a network simulation module, wherein the network simulation module performs digital network service simulation and digital network dynamic topology and behavior characteristic simulation;

And forming a satellite network digital prototype by combining the communication protocol stack, the basic model library and the network simulation module by using a simulation engine.

Further, the communication protocol stack sequentially comprises a physical layer, a link layer, a network layer, a transmission layer and an application layer from bottom to top, and each layer integrates corresponding protocol models, including a link transmission protocol model, a routing and transmission control protocol model.

Further, the basic model library comprises a node model, a link model, a topology model, a service model, a mobile model and a cache queue model; the node model comprises satellite nodes, user nodes and ground station nodes; the link model realizes the frequency, the speed and the function and the performance simulation of a basic communication system of an inter-satellite link, an inter-satellite user link and an inter-satellite feed link; the topology model simulates the satellite track position, the inter-satellite/satellite-ground connection state and the network topology change process of a satellite network through the modeling and dynamic deduction calculation of a satellite constellation structure and a satellite node orbit, and simulates the satellite constellation operation rule and the inter-satellite network topology of an inter-satellite network system; constructing the service model with configurable service data types, service sending rates and service volumes by simulating various service data sent by an inter-satellite network system through inter-satellite links, and performing service data sending simulation; on a node model, constructing the buffer queue model based on a service model and a protocol model, and analyzing the satellite load state and calculating the forwarding delay; and constructing the movement model according to the characteristics of the user terminal, and supporting the node track importing and the typical movement track autonomous generation.

Further, the network simulation performed by the network simulation module includes:

Digital network service simulation: the data flow is transferred and processed layer by layer in the communication protocol stack, or transferred in a cross-layer manner, adjacent layers in the communication protocol stack communicate through defined APIs, the communication logic between the adjacent layers is met, the communication between the adjacent layers is realized, and the user-defined function is supported to realize the communication function;

Digital network dynamic topology and behavior feature simulation: and simulating network behaviors of an inter-satellite network, an inter-satellite network and an inter-satellite user network in a high dynamic environment, simulating various network fault types, supporting node faults and link faults, supporting fault type definition and dynamic injection, and supporting simulation data statistics and network performance index calculation in the operation process.

Further, the simulation engine is provided with a distributed simulation event scheduling mechanism and a simulation time pushing mechanism, the network behavior is described through the generation and processing of the events, a large number of events generated by simulation operation are maintained to operate orderly and efficiently through distributed message interaction and a scene-based task scheduling mechanism, and the accuracy of network behavior simulation is ensured; the simulation time advances according to the occurrence of the event, and the acceleration and deceleration operation of the simulation is realized by controlling the advancing speed of the event.

Further, the satellite network digital prototype further comprises a semi-physical simulation interface, which is an interface for semi-physical simulation of the information flow and the network behavior in the network simulation module and the physical equipment, wherein the physical equipment is accessed through the Ethernet and performs data exchange, mutually analyzes and processes data, and realizes virtual-real combined simulation.

Further, the satellite network digital prototype establishes and runs a digital twin network scene by adopting the following steps:

Newly-built digital twin network scene: adding a scene name and related information for scene description, loading a new scene frame, and initializing model definition and situation display in the scene;

Configuring a digital twin network scenario: carrying out parameterized configuration of models for typical nodes and elements in a scene, wherein the parameterized configuration comprises positions or orbit/track models and parameters of satellite nodes, ground station nodes and terminal nodes, connection relations and configuration parameters of inter-satellite/satellite links and subnets, network protocol related model selection and parameter configuration, and generation parameters of service models, wherein the configuration of each element model is completed and synchronously displayed in a situation display page, so that the configuration and visual presentation of the scene are completed;

digital twin network simulation begins: sending a simulation start instruction through a control interface of a digital prototype, creating a configuration file required by a simulation engine through an automatic generation script of the configuration file, and describing detailed configuration parameters of digital models such as a network, nodes, protocols, services and the like contained in the simulation scene in detail for the simulation engine to use to complete the instantiation generation of the specific scene;

Digital twin network simulation operation: based on time propulsion and scheduling of distributed simulation events, the simulation engine dynamically calculates satellite orbits and node positions in a satellite digital twin network, calculates dynamic behaviors of a digital prototype according to a network protocol model, drives simulation to be carried out, and outputs related analysis results.

Further, the workflow of the satellite network digital prototype includes:

The operation flow of the digital prototype is as follows: sending an operation starting instruction through a front-end page, and generating a simulation configuration file by a background service according to a network operation scene; the simulation engine drives the business model of the digital prototype and the information interaction process simulation between the protocols of each layer; the simulation engine calculates the related indexes of network route and link transmission according to the relative position relation, distance and channel characteristics between nodes in the digital twin network scene, calculates the procedural index parameters in the digital network model, and dynamically displays the traffic flow transmission flow through nodes and typical parameter indexes;

Fault setting and recovery flow: the method comprises the steps that fault setting information is sent through a front-end man-machine interaction interface, a background service responds to the fault setting information, fault setting is carried out on a fault object by a simulation engine according to a fault type and the fault object, and a related flow of fault processing is caused; the fault recovery is that after an instruction is sent through an operation interface, a simulation engine recovers a fault model object, and meanwhile, the front end and the index are used for analyzing the process and the performance;

Simulation end and index evaluation flow: the triggering condition of the simulation ending comprises the arrival of preset simulation time, the sending of an ending instruction by front-end man-machine interaction, the closing of a simulation engine of the digital prototype after the ending process is triggered, the output of a simulation evaluation result, the ending of a situation display page and the reinitialization; and classifying and warehousing the collected evaluation results, displaying the result indexes on corresponding evaluation interfaces, and carrying out comparative analysis on the results.

A satellite network digital prototype device based on digital twinning comprises a simulation engine, a communication protocol stack, a basic model library and a network simulation module;

The communication protocol stack is constructed according to each layer of protocol of satellite network communication through a digital twin technology, and sequentially comprises a physical layer, a link layer, a network layer, a transmission layer and an application layer from bottom to top, wherein each layer integrates a corresponding protocol model;

the basic model library comprises a node model, a link model, a topology model, a business model, a mobile model and a cache queue model;

the network simulation module is used for simulating the digital network service and simulating the dynamic topology and behavior characteristics of the digital network;

The simulation engine has a distributed simulation event scheduling mechanism and a simulation time pushing mechanism.

The beneficial effects of the invention are as follows:

(1) The invention realizes the digital modeling of the key nodes and the protocol functions of the satellite network, can well construct a digital prototype of the network system, and reflects the relation among the satellite network protocol functions, processes and efficiency.

(2) The invention can build a systematic network system through a digital prototype, simulate the information interaction and networking system of a constellation network, and analyze and verify the service efficiency and the network function.

(3) The invention can connect and map with the physical equipment through the semi-physical simulation interface of the digital prototype device, and has the capability of testing and verifying the key network equipment.

Drawings

FIG. 1 is a functional block diagram of a satellite network digital prototype;

FIG. 2 is a flow chart of the operation of the newly created digital twin network scenario;

FIG. 3 is a flow chart of the operation of the digital sample machine;

FIG. 4 is a fault set-up and recovery flow chart;

FIG. 5 is a flow chart of the simulation end and evaluation of the digitizer.

Detailed Description

The present invention will be further described in detail with reference to the following examples and drawings, so that the above objects, features and advantages of the present invention can be more clearly understood.

1. Main structure and function of satellite network digital prototype based on digital twin

The digital model machine of the satellite network based on the digital twin is mainly used for realizing system simulation and network interaction protocol simulation of the satellite network, and the digital model machine of the satellite network is required to integrate a related networking protocol model, a network, a link and a topology model to complete model simulation functions of the digital twin network and virtual-real mapping and interaction functions with physical network equipment. The satellite network digital prototype has a perfect protocol stack architecture and has the construction and integrated operation capability for models such as a satellite network architecture, a satellite networking protocol, a service, a link and the like.

The model construction of the satellite network digital prototype mainly has the following structure and function aiming at the characteristics of the space network, as shown in fig. 1.

1) Simulation engine (digital simulation driving engine)

The simulation engine is based on a distributed simulation event scheduling mechanism and a simulation time pushing mechanism, the network behavior is described through the generation and processing of the events, a large number of events generated by simulation operation are maintained to operate orderly and efficiently through distributed message interaction and a scene-based task scheduling mechanism, and the accuracy of network behavior simulation is ensured. The simulation time advances according to the occurrence of the event, and the acceleration and deceleration operation of the simulation can be realized by controlling the advancing speed of the event. Meanwhile, the time reference of the whole system is used for driving the operation of other modules, so that time synchronization is ensured.

2) Communication protocol stack (digital network protocol stack model)

The communication protocol stack adopts a layered protocol stack, and sequentially comprises a physical layer, a link layer, a network layer, a transmission layer and an application layer from bottom to top, as shown in fig. 1, each layer integrates protocol models such as a link transmission protocol, a routing protocol, a transmission control protocol and the like, so as to form a protocol model library. The system has a perfect protocol stack architecture, a standard layer protocol adding interface and a packaged interlayer data interaction interface, and ensures that each layer of protocol module is easy to add, delete and switch, and the transparency and low coupling of an interlayer protocol are ensured. The protocol stack is integrated by each protocol module such as an interlayer interface and a simulation engine schedule, so that the modules can perform organic and coordinated work, and the overall benefit is exerted, thereby forming an integrated communication protocol stack and realizing the simulation verification of the comprehensive efficiency.

A) Link transport protocol model: the link transmission protocol model mainly completes the functions of error control, queue maintenance and scheduling, access control, time slot management and the like of the whole frame, and supports networking detection, link establishment, link maintenance, link termination and the like.

B) Routing and transmission control protocol model: and according to the design strategy of the space network routing protocol, a routing algorithm is realized. And providing a standardized routing algorithm model and a network layer interface, customizing a routing protocol according to requirements, and providing a data index acquisition interface such as network throughput, time delay and the like.

3) Network simulation: digital network service simulation

The information flow in the network simulation is that data flow is transferred and processed layer by layer in a communication protocol stack, and also can be transferred layer by layer, adjacent layers in the protocol stack communicate through defined APIs, and the communication between the adjacent layers is realized according with standard protocol interlayer communication logic. In addition, the user-defined function is supported to realize the communication function, and the user-specified functions such as cross-layer forwarding, specific protocol forwarding and the like can be easily realized.

4) Network simulation: digital network dynamic topology and behavior feature simulation

The network simulation simulates network behaviors such as dynamic topology, data processing flow, network faults and the like of an inter-satellite network, an inter-satellite network and a satellite user network in a high dynamic environment. Simulating the connection state, network behavior and information processing flow of an inter-satellite network, simulating various common network fault types, supporting node faults and link faults, and supporting fault type definition and dynamic injection. And supporting simulation data statistics and network performance index calculation in the running process, and providing data support for the result simulation software.

5) Digital prototype and real equipment semi-physical simulation

The semi-physical simulation interface is an interface for semi-physical simulation of information flow and network behavior in the network simulation module and physical equipment, and the physical equipment performs data exchange through an Ethernet access system, mutually analyzes and processes data, and realizes virtual-real joint simulation.

The construction of the model library information network characteristics in the digital prototype is to abstract model network nodes, network topology and network protocols by extracting network model components, and specifically comprises a satellite node/user node/ground station node model, an inter-satellite/satellite-ground link model, a service model, a protocol model, a topology model, a mobile model, a cache queue model and the like, wherein the model is assembled and parameter initialized by the digital prototype through configuration operation.

The model assembly and adaptation in the digital prototype are to integrate the models in the model library according to the protocol configuration requirements of the simulation scene, and dynamically load, configure and expand the models in a combined mode according to the simulation configuration and the simulation granularity so as to drive and manage the models, thereby completing different tasks.

2. Digital prototype construction flow

1) Satellite network digital prototype protocol model construction and simulation

And respectively carrying out analog simulation on protocol algorithms of each layer in the satellite network communication system, and giving out quantitative evaluation analysis results according to simulation operation results. Each layer of protocol of actual satellite network communication can be developed through a digital twin model and an interlayer interface to form a network communication protocol stack, and according to communication requirements, the network communication protocol stack is enabled to be used as a whole for simulation verification of an analog digital model, and optimization is carried out according to simulation verification results.

2) Satellite network digital prototype node model construction

The functions of the satellite node, the user node and the ground station node are simulated by a digital model. For the user node and the ground station node, the protocol processing, information receiving and transmitting and other models are required to be established, the data forwarding and processing of the satellite are simulated, and the user node is required to establish a position or area distribution model. For the satellite node, an orbit model and a payload model are established according to the operating environment, the load function, the core parameters, the communication interface and other core elements, so that satellite networking and communication capacity are accurately reflected, and a network entity model with standardized interface parameter customization, networking protocol flexible configuration, topology structure dynamic loading and efficient operation of simulation calculation is realized. The node behavior under different network environments and service states is simulated, and the protocol stack, the transmission mechanism and the information transmission process with the user are simulated.

3) Link model construction for satellite network digital prototype

The satellite network digital prototype interface model is a link model in an established network, and mainly realizes functions and performance simulation of inter-satellite links, satellite-ground user links, frequency and speed of satellite-ground feed links, basic communication systems and the like, and simulates state information such as inter-satellite/satellite-ground link speed, transmission delay and the like. The method provides a general wireless channel model for the inter-satellite/satellite-to-ground link, can set parameters such as channel transmission rate, bit error rate, modulation mode and the like, and simulates the influence on packet loss of information bit error under different states.

4) Space-time topology model construction of satellite network digital prototype

Through satellite constellation structure, modeling of satellite node orbit and dynamic deduction calculation, satellite track position, inter-satellite/satellite ground connection state and network topology change process of a satellite network are simulated, satellite constellation operation rule and inter-satellite network topology of an inter-satellite network system are simulated, inter-satellite/satellite ground link relation of the constellation can be configured, and network model simulation based on space-time change of an inter-satellite network communication function is supported.

5) Construction of satellite network digital prototype service model and cache queue model

And simulating various service data transmitted by the inter-satellite network system through inter-satellite links, constructing a service model with configurable service data types, service transmission rates and service volumes, generating the service model according to a transmission strategy, and performing service data transmission simulation.

On the satellite node model, a buffer queue model for satellite-borne route forwarding is constructed based on a service model and a protocol model, so that satellite load states can be analyzed, and forwarding time delay can be calculated.

6) Terminal node movement model construction of satellite network digital prototype

The satellite network is a global covered constellation system, the types of the user terminals are various, the satellite network comprises ground fixed nodes, mobile nodes and various high-speed mobile nodes in the air and in space, a node mobile model is constructed according to the characteristics of the user terminals, and the node track introduction and the typical mobile track autonomous generation are supported.

The content of the 1) -6) is the construction of a model, which is used as the basis of modeling of a digital prototype, and the model is further applied, so that the instantiation of a specific digital prototype is realized through parameter configuration, namely, a specific satellite network digital simulation scene required by a user is constructed through the combination of the model and specific parameter configuration.

7) Typical device of satellite network digital prototype

The development platform based on the embedded processor constructs a typical device of the satellite network digital prototype based on the structure shown in fig. 1, has a satellite-borne embedded computing platform, an embedded operating system environment and model software for running the network digital prototype, has an information interface and a signal interface which meet typical inter-satellite network communication, can realize interconnection among a plurality of sets of digital prototype devices, and at least completes protocol interaction and communication transmission among the prototypes through digital baseband interface signals. And the communication interface and the channel simulation device of the radio frequency modulation can be expanded to carry out communication connection and communication simulation. The typical device of the satellite network digital prototype is a platform system taking software as a core, and can run on hardware such as an embedded simulator or an industrial personal computer to become a special entity device; or may be run on a computing device such as a server, referred to as a software system only.

The digital twin network construction of the digital prototype is completed by establishing a satellite network digital simulation scene, configuring a node model, a protocol model and a link model and initializing parameters.

Based on the digital simulation engine, the network protocol stack model and the service model, the operation flow of the twin network simulation scene of the digital prototype can be constructed, as shown in figure 2. The method comprises the steps of constructing a network scene of a satellite network digital prototype, adding and defining node information, link topology information, a protocol model, a service model and attribute parameters in the network scene, automatically generating a configuration file of a simulation engine through a parameterized script after simulation starts, and displaying the digital twin network scene and driving a calculation process of the simulation engine.

The digital twin network scene operation flow in fig. 2 specifically includes the following steps:

a) Newly-built digital twin network scene: adding scene names and related information for scene description, loading a new scene frame, and initializing model definition and situation display in the scene.

B) Configuring a digital twin network scenario: the method mainly comprises the steps of carrying out parameterized configuration of models for typical nodes and elements in a scene, and mainly comprises, but is not limited to, satellite nodes, ground station nodes, position or orbit/track models of terminal nodes and parameters, connection relations and configuration parameters of inter-satellite/satellite-ground links and subnets, network protocol related model selection and parameter configuration, generating parameters of a service model, completing configuration of the element models, synchronously displaying the element models in a situation display page, and completing configuration and visual presentation of the scene.

C) Digital twin network simulation begins: sending a simulation start instruction through a control interface of the digital prototype, creating a configuration file required by the simulation engine through an automatic generation script of the configuration file, and describing detailed configuration parameters of digital models such as networks, nodes, protocols, services and the like contained in the simulation scene in detail for the simulation engine to use to complete the instantiation generation of the specific scene.

D) Digital twin network simulation operation: based on time propulsion and scheduling of distributed simulation events, the simulation engine dynamically calculates satellite orbits and node positions in a satellite digital twin network, and the simulation engine calculates dynamic behaviors of digital prototypes such as network routing, link transmission and the like according to a network protocol model, drives simulation to be carried out and outputs related analysis results.

3. Digital prototype workflow

1) Digital prototype operation flow

The operation flow of the digital prototype is shown in fig. 3, an operation starting instruction is sent through man-machine interaction control of a front-end page, and a background service generates a simulation configuration file according to a network operation scene; the simulation engine drives the business model of the digital prototype and the information interaction process simulation between the protocols of each layer. The simulation engine calculates network route and link transmission related indexes according to model parameters such as relative position relation and distance between nodes in a digital twin network scene, channel characteristics and the like, calculates procedural index parameters in a digital network model, and dynamically displays the traffic flow transmission flow through nodes and typical parameter indexes, including but not limited to network link transmission rate, packet loss rate, traffic transmission delay and the like.

2) Fault setting and recovery process

The fault setting and recovering process is shown in fig. 4, the fault setting information is sent through the front-end man-machine interaction interface, the background service responds to the fault setting information, and according to the fault type and the fault object, the simulation engine performs fault setting on the fault object and initiates the related process of fault processing. And analyzing the protocol coping condition and the index changing condition after fault setting through the front-end interface and the index data. The fault recovery process is similar to the setting process, and after an instruction is sent through an operation interface, the engine recovers a fault model object, and meanwhile, the process and the performance are analyzed through the front end and the index.

3) Simulation ending and index evaluation flow

The simulation ending and index evaluation flow of the digital prototype is shown in fig. 5, and the triggering condition of the simulation ending comprises the arrival of preset simulation time and the sending ending instruction of front-end man-machine interaction. After triggering the ending flow, closing a simulation engine of the digital prototype, outputting a simulation evaluation result, ending a situation display page and reinitializing; and classifying and warehousing the collected evaluation results, displaying the result indexes on corresponding evaluation interfaces, and further carrying out comparative analysis on the results.

Another embodiment of the invention provides a satellite network digital prototype device based on digital twinning, which comprises a simulation engine, a communication protocol stack, a basic model library and a network simulation module;

The communication protocol stack is constructed according to each layer of protocol of satellite network communication through a digital twin technology, and sequentially comprises a physical layer, a link layer, a network layer, a transmission layer and an application layer from bottom to top, wherein each layer integrates a corresponding protocol model;

the basic model library comprises a node model, a link model, a topology model, a business model, a mobile model and a cache queue model;

the network simulation module is used for simulating the digital network service and simulating the dynamic topology and behavior characteristics of the digital network;

The simulation engine has a distributed simulation event scheduling mechanism and a simulation time pushing mechanism.

Wherein the specific implementation of each module is referred to the previous description of the method of the present invention.

Another embodiment of the invention provides a computer device (computer, server, smart phone, etc.) comprising a memory storing a computer program configured to be executed by the processor and a processor, the computer program comprising instructions for performing the steps of the method of the invention.

Another embodiment of the invention provides a computer readable storage medium (e.g., ROM/RAM, magnetic disk, optical disk) storing a computer program which, when executed by a computer, performs the steps of the method of the invention.

The present invention is not described in detail in part as being well known to those skilled in the art.

The above-disclosed embodiments of the present invention are intended to aid in understanding the contents of the present invention and to enable the same to be carried into practice, and it will be understood by those of ordinary skill in the art that various alternatives, variations and modifications are possible without departing from the spirit and scope of the invention. The invention should not be limited to what has been disclosed in the examples of the specification, but rather by the scope of the invention as defined in the claims.

Claims (10)

1. The method for constructing the satellite network digital prototype based on the digital twin is characterized by comprising the following steps of:

constructing a communication protocol stack through a digital twin technology according to each layer of protocols of satellite network communication;

abstract modeling is carried out on network nodes, network topology and network protocols, and a basic model library is constructed;

constructing a network simulation module, wherein the network simulation module performs digital network service simulation and digital network dynamic topology and behavior characteristic simulation;

And forming a satellite network digital prototype by combining the communication protocol stack, the basic model library and the network simulation module by using a simulation engine.

2. The method of claim 1, wherein the communication protocol stack comprises, from bottom to top, a physical layer, a link layer, a network layer, a transport layer, and an application layer, each layer integrating respective protocol models, including a link transport protocol model, a routing and transmission control protocol model.

3. The method of claim 1, wherein the base model library comprises a node model, a link model, a topology model, a traffic model, a mobility model, and a cache queue model; the node model comprises satellite nodes, user nodes and ground station nodes; the link model realizes the frequency, the speed and the function and the performance simulation of a basic communication system of an inter-satellite link, an inter-satellite user link and an inter-satellite feed link; the topology model simulates the satellite track position, the inter-satellite/satellite-ground connection state and the network topology change process of a satellite network through the modeling and dynamic deduction calculation of a satellite constellation structure and a satellite node orbit, and simulates the satellite constellation operation rule and the inter-satellite network topology of an inter-satellite network system; constructing the service model with configurable service data types, service sending rates and service volumes by simulating various service data sent by an inter-satellite network system through inter-satellite links, and performing service data sending simulation; on a node model, constructing the buffer queue model based on a service model and a protocol model, and analyzing the satellite load state and calculating the forwarding delay; and constructing the movement model according to the characteristics of the user terminal, and supporting the node track importing and the typical movement track autonomous generation.

4. The method of claim 1, wherein the network simulation by the network simulation module comprises:

Digital network service simulation: the data flow is transferred and processed layer by layer in the communication protocol stack, or transferred in a cross-layer manner, adjacent layers in the communication protocol stack communicate through defined APIs, the communication logic between the adjacent layers is met, the communication between the adjacent layers is realized, and the user-defined function is supported to realize the communication function;

Digital network dynamic topology and behavior feature simulation: and simulating network behaviors of an inter-satellite network, an inter-satellite network and an inter-satellite user network in a high dynamic environment, simulating various network fault types, supporting node faults and link faults, supporting fault type definition and dynamic injection, and supporting simulation data statistics and network performance index calculation in the operation process.

5. The method according to claim 1, wherein the simulation engine is provided with a distributed simulation event scheduling mechanism and a simulation time pushing mechanism, the network behavior is described through generation and processing of events, a large number of events generated by simulation operation are maintained to operate orderly and efficiently through distributed message interaction and a scene-based task scheduling mechanism, and the accuracy of network behavior simulation is ensured; the simulation time advances according to the occurrence of the event, and the acceleration and deceleration operation of the simulation is realized by controlling the advancing speed of the event.

6. The method of claim 1, wherein the satellite network digital prototype further comprises a semi-physical simulation interface, which is an interface for performing semi-physical simulation on the information flow and the network behavior in the network simulation module and the physical equipment, wherein the physical equipment is accessed through the ethernet and performs data exchange, mutually analyzes and processes data, and realizes virtual-real joint simulation.

7. The method of claim 1, wherein the satellite network digital prototype establishes and runs a digital twin network scenario using the steps of:

Newly-built digital twin network scene: adding a scene name and related information for scene description, loading a new scene frame, and initializing model definition and situation display in the scene;

Configuring a digital twin network scenario: carrying out parameterized configuration of models for typical nodes and elements in a scene, wherein the parameterized configuration comprises positions or orbit/track models and parameters of satellite nodes, ground station nodes and terminal nodes, connection relations and configuration parameters of inter-satellite/satellite links and subnets, network protocol related model selection and parameter configuration, and generation parameters of service models, wherein the configuration of each element model is completed and synchronously displayed in a situation display page, so that the configuration and visual presentation of the scene are completed;

digital twin network simulation begins: sending a simulation start instruction through a control interface of a digital prototype, creating a configuration file required by a simulation engine through an automatic generation script of the configuration file, and describing detailed configuration parameters of digital models such as a network, nodes, protocols, services and the like contained in the simulation scene in detail for the simulation engine to use to complete the instantiation generation of the specific scene;

Digital twin network simulation operation: based on time propulsion and scheduling of distributed simulation events, the simulation engine dynamically calculates satellite orbits and node positions in a satellite digital twin network, calculates dynamic behaviors of a digital prototype according to a network protocol model, drives simulation to be carried out, and outputs related analysis results.

8. The method of claim 1, wherein the workflow of the satellite network digital prototype comprises:

The operation flow of the digital prototype is as follows: sending an operation starting instruction through a front-end page, and generating a simulation configuration file by a background service according to a network operation scene; the simulation engine drives the business model of the digital prototype and the information interaction process simulation between the protocols of each layer; the simulation engine calculates the related indexes of network route and link transmission according to the relative position relation, distance and channel characteristics between nodes in the digital twin network scene, calculates the procedural index parameters in the digital network model, and dynamically displays the traffic flow transmission flow through nodes and typical parameter indexes;

Fault setting and recovery flow: the method comprises the steps that fault setting information is sent through a front-end man-machine interaction interface, a background service responds to the fault setting information, fault setting is carried out on a fault object by a simulation engine according to a fault type and the fault object, and a related flow of fault processing is caused; the fault recovery is that after an instruction is sent through an operation interface, a simulation engine recovers a fault model object, and meanwhile, the front end and the index are used for analyzing the process and the performance;

Simulation end and index evaluation flow: the triggering condition of the simulation ending comprises the arrival of preset simulation time, the sending of an ending instruction by front-end man-machine interaction, the closing of a simulation engine of the digital prototype after the ending process is triggered, the output of a simulation evaluation result, the ending of a situation display page and the reinitialization; and classifying and warehousing the collected evaluation results, displaying the result indexes on corresponding evaluation interfaces, and carrying out comparative analysis on the results.

9. The satellite network digital prototype device based on digital twinning is characterized by comprising a simulation engine, a communication protocol stack, a basic model library and a network simulation module;

The communication protocol stack is constructed according to each layer of protocol of satellite network communication through a digital twin technology, and sequentially comprises a physical layer, a link layer, a network layer, a transmission layer and an application layer from bottom to top, wherein each layer integrates a corresponding protocol model;

the basic model library comprises a node model, a link model, a topology model, a business model, a mobile model and a cache queue model;

the network simulation module is used for simulating the digital network service and simulating the dynamic topology and behavior characteristics of the digital network;

The simulation engine has a distributed simulation event scheduling mechanism and a simulation time pushing mechanism.

10. A computer device comprising a memory and a processor, the memory storing a computer program configured to be executed by the processor, the computer program comprising instructions for performing the method of any of claims 1-8.