Spaceborne network architecture of TSN (Time Sensitive Network), construction method and communication method

Abstract

The invention relates to the technical field of satellite-borne integrated network design, in particular to a TSN time sensitive network satellite-borne network architecture, a construction method and a communication method. Comprising a plurality of function nodes which are respectively connected to networks with different rate levels according to respective data communication rate requirements; at least one central switching node which is loaded with a TSN lightweight agile switching algorithm and adopts an anti-radiation FPGA to carry out hardware implementation; the integrated self-adaptive design of the intra-satellite network and the inter-satellite network enables control data and load data to be transmitted under the same physical interface and protocol. Unified transmission of low-speed control instructions and high-speed load data is realized by adopting time certainty and high bandwidth characteristics of the TSN, and a conventional complex system with multiple buses and multiple protocols is simplified into a unified physical interface and protocol. The complexity of the system is reduced, and the conversion requirements between different protocols are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of satellite-based integrated network design, and in particular to a TSN time-sensitive network satellite-based network architecture, construction method and communication method. Background Art

[0002] With the vigorous development of electronic technology and networking communication technology, the use of highly integrated, cost-effective small satellites to form low-orbit constellations for global communications and earth observation has become a hot topic in the aerospace field. This trend has put forward higher requirements for satellite-borne information systems, not only requiring higher integration while ensuring reliability, but also requiring cost reduction and shortened development cycle to meet the needs of new aerospace missions such as launching multiple satellites with one rocket.

[0003] Low-orbit constellations require a high degree of autonomous operation. There is a massive amount of different types of information data transmission between and within satellites. How to efficiently plan the inter-satellite and intra-satellite information data transmission paths and realize the sharing of constellation information is the basis for completing the constellation's resilient networking, flexible information communication, and on-orbit collaborative applications. Therefore, it is necessary to build an integrated data interaction network for constellation information sharing.

[0004] In order to achieve integrated management of the onboard high-speed communication network and enhance the support of the bus interconnection network for high-performance and high-reliability design, the on-orbit information intelligence system designs the communication network according to the following principles:

[0005] ① Generalization: Only a generalized bus interconnection system can make it possible to standardize the interfaces of hardware and software systems under a multifunctional integrated system, thereby providing the basic underlying support required for the system's openness, flexible expansion capabilities, and system reconstruction capabilities;

[0006] ② High reliability: The bus interconnection itself has error control capabilities and can support system-level reorganization and recovery in the event of a failure;

[0007] ③ Efficient and reasonable: meet the needs of future unified information network services, support dynamic allocation of functional module resources and dynamic routing of different types of data, and meet the transmission services for large-capacity and low-latency data.

[0008] Traditionally, the control data of satellite-borne information systems mainly rely on low-speed buses such as 1553B and CAN to ensure real-time and reliable response, while payload data is transmitted through high-speed buses such as 2711 and SRIO. However, this solution has significant problems: 2711 and LVDS are not standard buses, and the protocol needs to be customized, resulting in poor compatibility. Networks such as SRIO are based on proprietary standards, with few suppliers, long development cycles and high costs. The interfaces and protocols of control and payload data are not unified, resulting in the need to equip two bus systems within the satellite, and protocol conversion is required within the equipment, increasing the complexity and cost of the system. In addition, unified network transmission cannot be achieved within and between satellites, further exacerbating the complexity of the system and the difficulty of development.

[0009] In response to the above problems, some products try to use TTE for unified transmission of control and payload data. TTE has experience in aerospace applications abroad, but it is a closed standard monopolized by Europe and the United States. The public part is also restricted by intellectual property rights, and it has disadvantages in terms of independent control. At the same time, because TTE only defines core standards such as time synchronization, the implementation of each manufacturer is different, and interoperability cannot be achieved. Summary of the invention

[0010] The present invention provides a TSN time-sensitive network on-board network architecture, construction method and communication method, which aims to meet the requirements of constellation satellites for highly integrated, standardized and cost-effective on-board information systems, and solve the problem that the low-speed control bus and high-speed payload data are independent of each other, causing the system to be complex and costly.

[0011] To achieve the above object, the technical solution of the present invention is:

[0012] A TSN time-sensitive network on-board network architecture, including:

[0013] Multiple functional nodes are connected to networks of different speed levels according to their respective data communication speed requirements;

[0014] At least one central switching node, used to achieve 10 / 100 / 1000 / 10000M multi-level rate network interconnection and interoperability. The switching node is equipped with TSN lightweight agile switching algorithm and is implemented in hardware using radiation-resistant FPGA;

[0015] The integrated adaptive design of intra-satellite and inter-satellite networks enables control data and payload data to be transmitted under the same physical interface and protocol, while ensuring the real-time nature of control signals and efficient transmission of high-bandwidth data.

[0016] Furthermore, the multiple functional nodes include:

[0017] High-speed data transmission nodes, such as payloads, high-speed intersatellite links, intelligent processing, data transmission and storage modules, with data communication rates of up to 10,000 Mbps;

[0018] Medium-speed data transmission nodes, with data communication rates of 500Mbps to 2000Mbps;

[0019] Low-speed data transmission node, the data communication rate is 10Mbps to 100Mbps.

[0020] Furthermore, the central switching node improves the reliability of the system through a primary-backup dual redundant bus switching architecture. All nodes are interactively connected to the primary and backup routes to ensure that when any node fails, it can continue to work by switching to the backup without affecting the normal operation of other nodes.

[0021] Furthermore, for high-speed nodes that require 1000 / 10000M rate switching, radiation-resistant SRAM FPGAs are used, while for medium and low-speed nodes that only require 10 / 100M rate switching, radiation-resistant anti-fuse or FLASH FPGAs are used to optimize cost and power consumption.

[0022] Furthermore, in order to improve the radiation resistance and stability of on-orbit operation, the following measures have been taken:

[0023] Select FPGAs with corresponding quality levels and radiation resistance indicators that meet performance and heat dissipation requirements. Different nodes have different speed requirements, so the selection should be adjusted accordingly.

[0024] For SRAM-type FPGA, triple-module redundancy plus timed refresh technology is used for protection, and a watchdog is used for monitoring;

[0025] Set up a fault-tolerant mechanism in the communication protocol to ensure the reliability of data transmission;

[0026] The whole system adopts dual exchange backup mode to eliminate single point failure and ensure that the system can still operate normally when individual nodes fail;

[0027] Identity authentication measures are set up for inter-satellite data and measurement and control data to ensure data security.

[0028] Furthermore, the TSN network realizes the unified transmission of low-speed control instructions and high-speed load data, simplifying the previous complex system with multiple buses and multiple protocols, and greatly reducing the complexity and development costs of the system.

[0029] Furthermore, the TSN network belongs to deterministic Ethernet, which can accurately exchange data according to the specified delay time, avoiding the risk of large delay and easy packet loss of ordinary Ethernet. At the same time, it is backward compatible with Ethernet, with more open standards, lower development costs, wider application range, and a maximum communication rate of up to 10Gbps.

[0030] A method for constructing a TSN-based satellite network architecture includes the following steps:

[0031] Count the communication rate requirements of various nodes and select the appropriate bus or network;

[0032] Carry out appropriate architecture design and adopt mixed rate interaction mode to meet efficient communication between nodes with different rate requirements;

[0033] Perform device selection and select the appropriate radiation-resistant FPGA type based on the rate requirements of each node;

[0034] Implement reliability design to improve the system's reliability and radiation resistance from multiple dimensions, including component selection, software and hardware collaborative design, and system redundancy backup.

[0035] Furthermore, the method includes utilizing the time-sensitive characteristics of TSN to ensure high-quality transmission of multiple types of data under the same network, while providing deterministic data transmission services to meet the strict requirements of aerospace applications for real-time and reliability.

[0036] The beneficial effects achieved by the present invention are:

[0037] The present invention provides a TSN time-sensitive network satellite network architecture, construction method and communication method, which realizes the unified transmission of low-speed control instructions and high-speed load data by adopting the time determinism and high-bandwidth characteristics of TSN, and simplifies the complex system of multiple buses and multiple protocols into a unified physical interface and protocol. This not only greatly reduces the complexity of the system, but also reduces the conversion requirements between different protocols, thereby effectively reducing the development cost, and realizes the unified transmission of satellite telemetry, remote control, attitude, mission planning and other control data as well as high, medium and low-speed load data, and the interface and protocol standardization design.

[0038] The present invention discloses a TSN time-sensitive network satellite network architecture, construction method and communication method. Compared with ordinary Ethernet, TSN belongs to deterministic Ethernet, which can accurately exchange data according to the specified delay time, avoiding the risk of large delay and easy packet loss of ordinary Ethernet. In addition, TSN is backward compatible with Ethernet, the standard is more open, the development cost is lower than the existing proprietary standards such as SRIO, and the application range is wider. The maximum communication rate can reach 10Gbps, which far exceeds the communication rate of existing satellite systems, ensuring the efficiency and timeliness of data transmission. The system adopts a master-slave dual redundant bus switching architecture, which further improves the reliability of the system and ensures that even if individual nodes fail, the entire system can still operate normally without affecting the work of other nodes.

[0039] The present invention discloses a TSN time-sensitive network satellite network architecture, construction method and communication method, and designs a multi-rate hybrid application network for the data communication rate requirements of different functional nodes. For modules that do not require high data transmission requirements, such as telemetry, command, thermal control and other acquisition and control modules, a low-cost, low-power FLASH or anti-fuse FPGA is used to load a 10M or 100M network. This design avoids the unnecessary increase in power consumption caused by the unification of all modules to a 10G or 1G network, especially under satellite vacuum conditions, which helps to solve the problem of heat dissipation of the entire machine.

[0040] The present invention discloses a TSN time-sensitive network satellite network architecture, construction method and communication method. Since there is no radiation-resistant TSN routing chip in China, this solution adopts a radiation-resistant FPGA plus a soft core to implement a TSN switch, and takes targeted measures from multiple dimensions such as device selection, software and hardware collaborative design, and system redundancy backup to meet the strict requirements of satellite applications such as radiation resistance and low power consumption. In particular, for SRAM-type FPGAs, triple-mode redundancy plus dynamic refresh technology is used for protection, and a watchdog is used for monitoring to ensure the stability and reliability of on-orbit operation.

[0041] The present invention provides a TSN time-sensitive network satellite network architecture, construction method and communication method. As a global technical standard, TSN has open and unified standard specifications, which can ensure high-quality transmission of multiple types of data in the same network. This not only promotes the integrated adaptive design of intra-satellite and inter-satellite networks, but also provides a high-speed channel for constellation distributed computing and collaborative construction, greatly improving satellite efficiency and standardization, and is conducive to the expansion and upgrading of future aerospace projects.

[0042] The present invention provides a TSN time-sensitive network satellite network architecture, construction method and communication method, which improves the configurability and scalability of the system, shortens the research and development cycle, and makes the integration and testing of new functions easier, thereby improving the overall research and development efficiency by adopting standardized physical interfaces and protocols and flexible multi-rate design.

[0043] The present invention provides a TSN time-sensitive network satellite network architecture, construction method and communication method, which conveniently realizes the mutual backup of multiple channels such as inter-satellite, measurement and control, and relay through an integrated network, further improving the system reliability and convenience of satellite telemetry and remote control. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0045] Figure 1 Schematic diagram of the TSN-based onboard integrated high-speed switching network interconnection.

[0046] Figure 2 This is a schematic diagram of the onboard integrated high-speed switching network connection.

[0047] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0050] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if the meaning of "and / or" appearing in the full text is to include three parallel solutions, taking "A and / or B" as an example, it includes solution A, or solution B, or a solution that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0051] TSN (Time-Sensitive Networking), or time-sensitive network, started later than TTE, but its standard is an open protocol. Relying on the IEEE international standards organization, its architecture covers a wider range of application scenarios and is more conducive to achieving autonomous control and interconnection. TSN is a set of network standards developed by IEEE 802, which is an improvement on the existing Ethernet network technology. According to a series of TSN standards, a common time-sensitive mechanism is provided for the data link layer of the Ethernet protocol, which provides determinism and reliability for standard Ethernet to ensure real-time, deterministic and reliable data transmission and improve data transmission efficiency. TSN is one of the most popular technologies in the current industrial communication field and is considered by the international industry to be the most likely unified standard for industrial communication in the future. At present, organizations such as IEEE and IEC are formulating more complete underlying interoperability standards and specifications for TSN-based industrial application networks. In key application areas, TSN can achieve sub-microsecond synchronization accuracy that conventional Ethernet cannot achieve, has the characteristics of high fault tolerance and low cost, can handle rate-limited traffic and simultaneously cope with different types of data and communication requirements.

[0052] Although TSN has the advantages of openness, standardization, and the transmission of real-time and non-real-time data on the same network, and has been widely tested on the ground, there is no mature design for the satellite information system. This is because the satellite information system is the hub of the information flow and control flow of the entire satellite, and cannot be repaired in orbit. Long-term unmanned conditions are required to ensure stable operation in orbit. It is necessary to consider radiation resistance design, and at the same time, the satellite vacuum heat dissipation is difficult, the volume and weight are strictly limited, and the reliability requirements are high. Strict cost control is also required for constellation applications. Under these multiple constraints, the application of TSN in satellite information systems is much more stringent than ground applications, and special design is required to meet usage requirements.

[0053] According to the differences in transmission rate requirements for control data such as telemetry, remote control, attitude, mission planning, and high-, medium-, and low-speed payload data in the satellite information system, as well as constraints such as heat consumption and cost, the communication rates of different types of single machines or modules are reasonably selected, and the time-sensitive and high-speed characteristics of TSN are utilized. The satellite-borne high-reliability FPGA is used to load the TSN lightweight agile switching algorithm. At the system level, multi-level radiation-resistant reinforcement measures are taken to implement a multi-port, multi-rate satellite-borne TSN switch, and realize 10 / 100 / 1000 / 10000M multi-level rate network interconnection. At the same time, inter-satellite data is also connected to the switch for data routing to realize integrated network interaction within and between satellites.

[0054] TSN is a new generation of network standards based on Ethernet, with time synchronization, delay guarantee and other functions to ensure real-time performance. TSN eliminates the uncertainty of standard Ethernet caused by traffic "congestion". As the most likely standardized real-time Ethernet technology to be widely used, TSN is extending to areas such as industrial buses to solve the differences in physical interfaces, transmission mechanisms, and object dictionaries of buses, as well as the difficulty in unifying standards of different manufacturers. At the same time, China has developed a 10G network based on TSN, which can be realized by relying on SRAM-type FPGAs with radiation-resistant standards. 10G / 1G hybrid switches are used, and three-mode redundancy, timed refresh, dynamic reconstruction and other technologies are used to ensure the reliability of on-orbit operation. In order to ensure system reliability, the design adopts a dual-switch network mode for system backup, that is, the primary and backup of each node are connected to the primary and backup of the switch respectively. If any node fails, it can be interconnected by switching the backup of the node without affecting other nodes.

[0055] At the same time, not all modules have high data transmission requirements. Many modules are mainly used for traditional telemetry, command, thermal control and other acquisition and control, with a rate lower than 10Mbps. If unified to 10G or 1G network, it will lead to increased power consumption of modules and the whole machine, and it will be more difficult to dissipate heat under the vacuum conditions on board the satellite; and it is necessary to use SRAM-type FPGA with high-speed data transmission and processing as interface management, which will significantly increase the cost. To solve this problem, it is necessary to design a multi-rate hybrid application network. On the traditional modules, low-cost and low-power FLASH or anti-fuse FPGA is used to load 10M or 100M network. These nodes are internally interconnected with the central switching node, and the central switching node is interconnected with the outside using 10G / 1G TSN, ultimately realizing the unified transmission of control data and payload data, standardized design of interfaces and protocols, and building an integrated high-speed switching network between satellites.

[0056] To ensure security, identity authentication measures are set up during inter-satellite data access and routing to ensure network security.

[0057] like Figure 1As shown, a TSN time-sensitive network on-board network architecture includes:

[0058] Multiple functional nodes are connected to networks of different speed levels according to their respective data communication speed requirements;

[0059] At least one central switching node, used to achieve 10 / 100 / 1000 / 10000M multi-level rate network interconnection and interoperability. The switching node is equipped with TSN lightweight agile switching algorithm and is implemented in hardware using radiation-resistant FPGA;

[0060] The integrated adaptive design of intra-satellite and inter-satellite networks enables control data and payload data to be transmitted under the same physical interface and protocol, while ensuring the real-time nature of control signals and efficient transmission of high-bandwidth data.

[0061] The multiple functional nodes include:

[0062] High-speed data transmission nodes, such as payloads, high-speed intersatellite links, intelligent processing, data transmission and storage modules, with data communication rates of up to 10,000 Mbps;

[0063] Medium-speed data transmission nodes, with data communication rates of 500Mbps to 2000Mbps;

[0064] Low-speed data transmission node, the data communication rate is 10Mbps to 100Mbps.

[0065] The central switching node improves the reliability of the system through a primary-backup dual redundant bus switching architecture. All nodes are interactively connected to the primary and backup routes to ensure that when any node fails, it can continue to work by switching to the backup without affecting the normal operation of other nodes.

[0066] For high-speed nodes that require 1000 / 10000M rate switching, radiation-resistant SRAM FPGAs are used, while for medium and low-speed nodes that only require 10 / 100M rate switching, radiation-resistant anti-fuse or FLASH FPGAs are used to optimize cost and power consumption.

[0067] In order to improve the radiation resistance and stability of on-orbit operation, the following measures have been taken:

[0068] Select FPGAs with corresponding quality levels and radiation resistance indicators that meet performance and heat dissipation requirements. Different nodes have different speed requirements, so the selection should be adjusted accordingly.

[0069] For SRAM-type FPGA, triple-module redundancy plus timed refresh technology is used for protection, and a watchdog is used for monitoring;

[0070] Set up a fault-tolerant mechanism in the communication protocol to ensure the reliability of data transmission;

[0071] The whole system adopts dual exchange backup mode to eliminate single point failure and ensure that the system can still operate normally when individual nodes fail;

[0072] Identity authentication measures are set up for inter-satellite data and measurement and control data to ensure data security.

[0073] The TSN network realizes the unified transmission of low-speed control instructions and high-speed load data, simplifies the previous complex system of multiple buses and multiple protocols, and greatly reduces the complexity and development cost of the system.

[0074] The TSN network belongs to deterministic Ethernet, which can accurately exchange data according to the specified delay time, avoiding the risk of large delay and easy packet loss of ordinary Ethernet. At the same time, it is backward compatible with Ethernet, with more open standards, lower development costs, wider application range, and the maximum communication rate can reach 10Gbps.

[0075] Schematic diagram of the interconnection of the integrated high-speed switching network within and between satellites, such as Figure 2 As shown, inter-satellite routing and intra-satellite data exchange are uniformly implemented in the FPGA of the routing and switching module, and a unified TSN bus is used for data access.

[0076] A method for constructing a TSN-based satellite network architecture includes the following steps:

[0077] Count the communication rate requirements of various nodes and select the appropriate bus or network;

[0078] Carry out appropriate architecture design and adopt mixed rate interaction mode to meet efficient communication between nodes with different rate requirements;

[0079] Perform device selection and select the appropriate radiation-resistant FPGA type based on the rate requirements of each node;

[0080] Implement reliability design to improve the system's reliability and radiation resistance from multiple dimensions, including component selection, software and hardware collaborative design, and system redundancy backup.

[0081] The approach involves leveraging the time-sensitive nature of TSN to ensure high-quality transmission of multiple types of data over the same network, while providing deterministic data transmission services to meet the stringent real-time and reliability requirements of aerospace applications.

[0082] This solution uses onboard high-reliability FPGA + lightweight agile switching algorithm design + multi-level radiation-resistant reinforcement measures to realize multi-port, multi-rate onboard TSN switches, and achieve 10 / 100 / 1000 / 10000M multi-level rate network interconnection. The following takes a typical satellite information system as an example and combines the accompanying drawings to further illustrate the technical solution of the present invention.

[0083] 1) Count the communication rate requirements of various nodes and select the appropriate bus or network;

[0084] The requirements of each functional node for data communication rate are shown in Table 1.

[0085] It can be seen from Table 1 that in the satellite information system, the functional nodes such as payload, high-speed intersatellite link, intelligent processing, data transmission, and fixed storage can reach a rate of 10000Mbps, the central computer requires a rate of about 1000Mbps, the interface module is about 100Mbps, and other functional nodes such as measurement and control, GNSS, and low-speed intersatellite links are about 10Mbps. The rate requirements of each functional node are different.

[0086] Function Node Communication rate requirements Remark Load 10000Mbps Load Low-speed intersatellite links 10Mbps Intersatellite Link High-speed intersatellite links 10000Mbps Intersatellite Link Measurement and Control 10Mbps GNSS 10Mbps Intelligent processing 10000Mbps Digital Transmission 10000Mbps Central Computer 1000Mbps Interface modules 100Mbps Storage module 10000Mbps

[0087] At the same time, the central computer, measurement and control, etc. are mainly responsible for the data processing and control of the telemetry, remote control, thermal control and other platforms, emphasizing reliability and certainty, while the payload, data transmission, etc. emphasize the timeliness of large data transmission, and the requirements of the two have different emphases. The control flow and high-speed data flow of the traditional satellite information system are realized through different buses, which makes the system complex and costly.

[0088] The present invention adopts TSN as the information transmission network. TSN is a time-sensitive network with open, unified standard specifications and accurate and real-time data transmission capabilities, which can ensure high-quality transmission of multiple types of data in a unified network.

[0089] 2) Carry out appropriate architecture design

[0090] In terms of architecture design, in order to avoid unnecessary power consumption and cost loss caused by the use of high-speed bandwidth in low-speed nodes, a mixed rate interaction mode is adopted. The routing interaction (primary / backup) within the information system sets up a TSN mixed rate interaction machine to meet the 10 / 100 / 1000 / 10000M multi-level rate network interaction requirements. Other types of nodes are connected to the primary / backup of the routing interaction according to their own rate requirements listed in Table 1, and 10M, 100M, 1000M or 10000M can be selected. In order to improve the reliability of satellite applications, a dual switching network mode is used for system backup, that is, the primary and backup of each node are connected to the primary and backup of the routing interaction respectively. If any node fails, interconnection can be achieved by switching the backup of the node without affecting other nodes.

[0091] 3) Device selection

[0092] Since there is no dedicated radiation-resistant TSN chip available, the radiation-resistant FPGA plus TSN soft core is used to implement it. In order to consider cost and reliability, etc., for high-speed nodes with 1000 / 10000M rate exchange requirements, such as payload, high-speed intersatellite link, intelligent processing, data transmission, storage, routing interaction, etc., radiation-resistant SRAM FPGA is used. The currently more commonly used K7, V7 and other series meet the requirements; for medium and low-speed nodes with 10 / 100M rate exchange requirements, such as low-speed intersatellite links, measurement and control, GNSS, etc., radiation-resistant anti-fuse or FLASH FPGA is used. In current satellite-borne applications, both high-speed and low-speed nodes generally contain FPGAs to meet interface and data processing requirements. The device selection of the present invention is consistent with the FPGA in the existing system, and no additional system cost is required.

[0093] 4) Reliability design

[0094] In order to improve the onboard radiation resistance and stable working ability of the satellite, a multi-level protection strategy is adopted:

[0095] ① FPGA with corresponding quality grade and radiation resistance index should be used to meet the use requirements;

[0096] ② In view of the single-particle upset that may affect the normal operation of SRAM-type FPGA, triple-mode redundancy plus dynamic refresh is adopted for protection, and watchdog is used for monitoring;

[0097] ③ The communication protocol sets up a fault-tolerant mechanism to ensure reliable transmission;

[0098] ④ The system adopts a dual exchange backup method. The primary and backup of all nodes can exchange information with the primary and backup of the routing interaction respectively, eliminating the single point of the system, and the failure of individual nodes will not affect the normal operation of other nodes.

[0099] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A TSN time-sensitive network on-board network architecture, characterized in that: include: Multiple functional nodes are connected to networks of different speed levels according to their respective data communication speed requirements; At least one central switching node, used to achieve 10 / 100 / 1000 / 10000M multi-level rate network interconnection and interoperability. The switching node is equipped with TSN lightweight agile switching algorithm and implemented in hardware with radiation-resistant FPGA; The integrated adaptive design of intra-satellite and inter-satellite networks enables control data and payload data to be transmitted under the same physical interface and protocol, while ensuring the real-time nature of control signals and efficient transmission of high-bandwidth data.

2. The satellite-based network architecture according to claim 1, characterized in that: The multiple functional nodes include: High-speed data transmission nodes, including payload, high-speed intersatellite link, intelligent processing, data transmission and storage modules. The data communication rate of high-speed data transmission nodes reaches 10000Mbps; Medium-speed data transmission nodes, with data communication rates ranging from 500Mbps to 2000Mbps; Low-speed data transmission node, the data communication rate is 10Mbps to 100Mbps.

3. The satellite-based network architecture according to claim 1, characterized in that: The central switching node improves the reliability of the system through a primary-backup dual redundant bus switching architecture. All nodes are interactively connected to the primary and backup routes to ensure that when any node fails, it can continue to work by switching to the backup without affecting the normal operation of other nodes.

4. The satellite-based network architecture according to claim 1, characterized in that: For high-speed nodes that require 1000 / 10000M rate switching, radiation-resistant SRAM FPGAs are used, while for medium and low-speed nodes that only require 10 / 100M rate switching, radiation-resistant anti-fuse or FLASH FPGAs are used to optimize cost and power consumption.

5. The satellite-based network architecture according to claim 1, characterized in that: In order to improve the radiation resistance and stability of on-orbit operation, the following measures have been taken: Select FPGAs with corresponding quality levels and radiation resistance indicators that meet performance and heat dissipation requirements. Different nodes have different speed requirements, so the selection should be adjusted accordingly. For SRAM-type FPGA, triple-module redundancy plus timed refresh technology is used for protection, and a watchdog is used for monitoring; Set up a fault-tolerant mechanism in the communication protocol to ensure the reliability of data transmission; The whole system adopts dual exchange backup mode to eliminate single point failure and ensure that the system can still operate normally when individual nodes fail; Identity authentication measures are set up for inter-satellite data and measurement and control data to ensure data security.

6. A method for constructing a TSN satellite network architecture according to any one of claims 1 to 5, characterized in that: The following steps are involved: Count the communication rate requirements of various nodes and select the appropriate bus or network; Carry out appropriate architecture design and adopt mixed rate interaction mode to meet efficient communication between nodes with different rate requirements; Perform device selection and select the appropriate radiation-resistant FPGA type based on the rate requirements of each node; Implement reliability design to improve the system's reliability and radiation resistance from multiple dimensions, including component selection, software and hardware collaborative design, and system redundancy backup.

7. A communication method applied to the TSN onboard network architecture as claimed in any one of claims 1 to 5, characterized in that: The approach involves leveraging the time-sensitive nature of TSN to ensure high-quality transmission of multiple types of data over the same network, while providing deterministic data transmission services to meet the stringent real-time and reliability requirements of aerospace applications.

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