Energy-saving and invulnerability routing method and system for satellite optical network based on extended inter-satellite link

Abstract

The application relates to the technical field of satellite communication, and provides a satellite optical network energy-saving and invulnerability routing method based on an extended inter-satellite link, a comprehensive energy efficiency and eavesdropping risk evaluation model is constructed, and risk values of all satellite nodes are obtained; in each time snapshot, the extended link is integrated into a physical adjacent link topology, a virtual full-connection topology structure is constructed, and the average of risk values of satellite nodes at two ends of a link is taken as a risk weight of the link. A high-risk satellite node is removed from the virtual full-connection topology to generate a safe subgraph, in the subgraph, the risk weight is taken as a path cost, an optimal path is obtained by using a shortest path algorithm, and all potential links of the remaining satellite nodes are closed. The application further discloses a system of the method, and the method and the system enable the routing process to actively avoid a high-risk area in network dynamic change, realize energy-saving optimization by activating the extended link on demand, and realize zero-risk transmission without increasing the cost of multiple protection paths.

Description

Technical Field

[0001] This invention relates to the field of satellite communication technology, and in particular to an energy-saving and damage-resistant routing method and system for satellite optical networks based on extended inter-satellite links. Background Technology

[0002] With the continued advancement of the large-scale deployment of low-Earth orbit satellite constellations, building a high-speed, stable, and interference-resistant space information transmission system has become a core development direction in the aerospace communications field. Free-space optical communication, with its advantages of high bandwidth, high directivity, and strong resistance to electromagnetic interference, has become the mainstream technology for inter-satellite links, providing crucial support for building a space information network with full coverage and low latency. However, when laser signals are transmitted over long distances in open space environments, their propagation paths and beam characteristics are easily detected and intercepted by external nodes, exposing satellite optical networks to multiple security risks such as passive eavesdropping, active interference, and link hijacking. These physical layer security vulnerabilities directly restrict the engineering application of inter-satellite optical communication in highly confidential scenarios and also impose more stringent technical requirements on the reliability and security of space information transmission.

[0003] CN121173360A discloses a satellite optical communication link switching method, system, electronic device, and storage medium. By analyzing and processing the first bit error rate and / or first signal strength of the first satellite-to-ground link between the first satellite and the first ground gateway station to obtain the average bit error rate and / or average signal strength, abnormal conditions of the first satellite-to-ground link can be identified in a timely and accurate manner. By acquiring the position information of each satellite, the service information of the service data, and the performance parameters of multiple inter-satellite links, and calculating the link weight of each inter-satellite link based on this information to select the target inter-satellite link, a suitable inter-satellite transmission path can be efficiently determined. Then, the service data is forwarded from the first satellite to the target satellite through the target inter-satellite link, and subsequently, the service data is forwarded with the help of the target satellite and its corresponding target ground gateway station.

[0004] CN121124939A discloses a laser satellite communication system, comprising: a satellite signal modulation unit, a satellite laser mode mapping unit, a free-space transmission channel, a satellite laser mode demapping unit, and a satellite signal demodulation unit; the satellite signal modulation unit modulates the input electrical signal, and the modulated optical signal enters the satellite laser mode mapping unit; the satellite laser mode mapping unit includes: a mode resource selection module and a mode mapping module; the mode resource selection module selects modes that meet the mode quantity requirements based on the number of modes, the anti-interference capability of the modes, and the mode isolation, converts the optical signal into the required mode, and marks the used modes as used; the mode mapping module multiplexes multiple selected optical modes to form a multiplexed optical signal and transmits it; the multiplexed optical signal passes through a free-space transmission channel. A space transmission channel enables long-distance optical communication. The satellite laser mode demapping unit receives optical signals from the free-space transmission channel. The satellite laser mode demapping unit includes a mode demapping module and a mode resource pool retrieval module. The mode demapping module receives and demultiplexes the multiplexed optical signals, separating each optical mode. The mode resource pool retrieval module re-marks the transmitted modes as unused. The satellite signal demodulation unit amplifies and compensates the power of the demultiplexed optical signals, then performs photoelectric conversion. A neural network algorithm is used to independently compensate each generated electrical signal, reducing noise and interference during signal transmission to obtain the output electrical signal. The satellite signal modulation unit includes a modulation module and a mode selection module. The modulation module uses a dual-polarization IQ modulator for coherent optical communication.

[0005] Traditional satellite optical network communication uses a survival protection mechanism that relies on redundant backup links, which leads to waste of onboard resources and excessive energy consumption. Furthermore, the static topology-based design cannot adapt to the dynamic topology of satellite networks and the risk of time-varying eavesdropping, making it difficult to achieve secure and efficient transmission under resource-constrained conditions. Summary of the Invention

[0006] Long-term practical experience has shown that existing solutions mostly adopt traditional network survivability protection mechanisms, such as 1+1 protection or 1:1 protection strategies. The 1+1 protection scheme involves simultaneously copying service data to both the primary and backup paths at the sending end for transmission, with the receiving end selectively receiving the data. While this method offers fast failover speed, it requires twice the resources and consumes extremely high energy. The 1:1 protection scheme pre-calculates the backup path but does not transmit services under normal circumstances, only activating the backup path when the primary path is threatened or interrupted. While this method saves resources to some extent, it still faces problems of frequent calculations and resource idleness when dealing with highly dynamic satellite networks.

[0007] While such methods can mitigate link threats and failures through redundant paths, they require the pre-reservation of substantial backup link resources. This not only wastes significant onboard computing resources but also significantly increases overall network energy consumption, contradicting the inherent constraints of limited satellite network resources and low-power operation. Furthermore, most existing routing schemes are based on static topology designs, which cannot flexibly adapt to the highly dynamic changes in topology caused by the high-speed movement of satellites, nor can they effectively address the risk of eavesdropping that dynamically changes with geographical location.

[0008] In view of this, the present invention provides an energy-saving and damage-resistant routing method for satellite optical networks based on extended inter-satellite links, comprising: Step S1: Construct a comprehensive energy efficiency eavesdropping risk assessment model, and use the fuzzy comprehensive evaluation method to quantify the eavesdropping risk of satellite nodes from four dimensions: space, time, technology and environment to obtain the risk value of satellite nodes; Step S2: In each time snapshot, satellites within the optically visible range that meet preset conditions are included as extended links in the topology of physically connected adjacent links to complete the construction of a virtual fully connected topology. The average risk value of the satellite nodes at both ends of the link is used as the risk weight of the link. Step S3: Remove all satellite nodes marked as high risk from the virtual fully connected topology to generate a safe subgraph. In the safe subgraph, the shortest path algorithm with the risk weight as the cost obtains the optimal path. Step S4: Select the satellite nodes involved in the optimal path to establish physical links, and keep the potential links of the remaining satellite nodes closed.

[0009] Preferably, in step S1, the four dimensions of space, time, technology and environment are each broken down into quantifiable indicators, and the risk value of the satellite node is obtained by weighting each quantifiable indicator.

[0010] Preferably, in step S2, a virtual fully connected topology is constructed as graph G(V, E), where there is a link E connecting each satellite node V.

[0011] Preferably, in step S3, the KSP algorithm is used to calculate K candidate paths from satellite node i to satellite node j, and then the shortest path is selected from the K candidate paths as the output.

[0012] Preferably, the spatial dimension includes the relative position of the attacker and the relay satellite, and the distribution density of ground listening stations.

[0013] Preferably, the time dimension includes the duration of continuous connection of the satellite-to-ground link.

[0014] Preferably, the technical dimensions include encryption strength and key update frequency; the environmental dimensions include the impact of atmospheric attenuation and background noise on signal interception.

[0015] Preferably, the risk value of the satellite node will be dynamically updated with each snapshot to reflect the dynamic changes in risk of the satellite node under different orbital positions and environmental conditions.

[0016] This invention also discloses a system for an energy-saving and robust routing method for satellite optical networks based on extended inter-satellite links, as described above. The system includes... The building unit is used to construct a comprehensive energy efficiency eavesdropping risk assessment model, which can use the fuzzy comprehensive evaluation method to quantify the eavesdropping risk of satellite nodes from four dimensions: space, time, technology and environment to obtain the risk value of satellite nodes; The weight setting unit, within each time snapshot, uses satellites within the optically visible range that meet preset conditions as extended links to include in the topology of physically connected adjacent links, thereby completing the construction of a virtual fully connected topology, and uses the average risk value of the satellite nodes at both ends of the link as the risk weight of the link. The path optimization unit is used to remove all satellite nodes marked as high risk from the virtual fully connected topology, generate a safe subgraph, and obtain the optimal path in the safe subgraph using the shortest path algorithm at the cost of the risk weight. The data transmission unit is used to select the satellite nodes involved in the optimal path to establish physical links, and to keep the potential links of the remaining satellite nodes closed.

[0017] The present invention also discloses a machine-readable storage medium storing instructions for causing a machine to execute the energy-saving and damage-resistant routing method for satellite optical networks based on extended inter-satellite links as described in any of the preceding claims.

[0018] This invention provides an energy-saving and anti-tampering routing method for satellite optical networks based on extended inter-satellite links. Through steps S1-S4, a comprehensive energy efficiency eavesdropping risk assessment model is first constructed. Based on the fuzzy comprehensive evaluation method, the eavesdropping risk of satellite nodes is quantitatively calculated from four dimensions: space, time, technology, and environment, obtaining the risk value of each satellite node. Within each time snapshot, optically visible satellites that meet preset conditions are integrated into the physically adjacent link topology as extended links, constructing a virtual fully connected topology. The average risk value of the satellite nodes at both ends of the link is used as the risk weight of that link. Subsequently, high-risk satellite nodes are removed from the virtual fully connected topology to generate a secure subgraph. Within the subgraph, the optimal path is obtained using the shortest path algorithm with the risk weight as the path cost. Finally, physical links are established only for the satellite nodes involved in the optimal path, and all potential links for other satellite nodes are closed. This invention also discloses a system for an energy-saving and anti-tampering routing method for satellite optical networks based on extended inter-satellite links. This method and system enable the routing process to proactively avoid high-risk areas during dynamic network changes, while simultaneously achieving energy-saving optimization by activating extended links on demand, achieving zero-risk transmission without increasing the overhead of multiple protection paths. Attached Figure Description

[0019] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 The diagram shows a traditional link (a) and a link diagram (b) in an embodiment of the present invention of a satellite optical network energy-saving and damage-resistant routing method based on extended inter-satellite links. Detailed Implementation

[0020] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0021] To address the current prevalence of traditional network survivability protection mechanisms, which rely on concurrent replication of services to primary and backup paths at the sending end and selective reception at the receiving end, this approach offers high failover efficiency but doubles resource consumption and leads to excessive energy expenditure. Alternatively, pre-calculating backup paths and refraining from service transmission when the primary path is functioning normally saves some resources but faces significant computational overhead and resource idleness issues in highly dynamic satellite networks. These redundancy protection methods require reserving substantial backup resources, wasting limited onboard computing power and increasing overall network energy consumption, contradicting the inherent requirements of resource-constrained and low-power operation in satellite networks. Furthermore, existing routing methods largely rely on static topology designs, failing to adapt to dynamic topology changes caused by high-speed satellite movement and ineffectively addressing the risk of eavesdropping that changes with geographical location in real time. This invention proposes an energy-saving and robust routing method for satellite optical networks based on extended inter-satellite links, such as... Figure 1 As shown, the energy-saving and damage-resistant routing method for satellite optical networks based on extended inter-satellite links includes: Step S1: Construct a comprehensive energy efficiency eavesdropping risk assessment model, and use the fuzzy comprehensive evaluation method to quantify the eavesdropping risk of satellite nodes from four dimensions: space, time, technology and environment to obtain the risk value of satellite nodes; Step S2: In each time snapshot, satellites within the optically visible range that meet preset conditions are included as extended links in the topology of physically connected adjacent links to complete the construction of a virtual fully connected topology. The average risk value of the satellite nodes at both ends of the link is used as the risk weight of the link. Step S3: Remove all satellite nodes marked as high risk from the virtual fully connected topology to generate a safe subgraph. In the safe subgraph, the shortest path algorithm with the risk weight as the cost obtains the optimal path. Step S4: Select the satellite nodes involved in the optimal path to establish physical links, and keep the potential links of the remaining satellite nodes closed.

[0022] This invention provides an energy-saving and anti-tampering routing method for satellite optical networks based on extended inter-satellite links. Through steps S1-S4, a comprehensive energy efficiency eavesdropping risk assessment model is first constructed. Based on fuzzy comprehensive evaluation, the eavesdropping risk of satellite nodes is quantitatively calculated from four dimensions: space, time, technology, and environment, obtaining the risk value of each satellite node. Within each time snapshot, optically visible satellites that meet preset conditions are integrated into the physically adjacent link topology as extended links, constructing a virtual fully connected topology. The average risk value of the satellite nodes at both ends of the link is used as the risk weight of that link. Subsequently, high-risk satellite nodes are removed from the virtual fully connected topology to generate a secure subgraph. Within the subgraph, the optimal path is obtained using the shortest path algorithm with the risk weight as the path cost. Finally, physical links are established only for the satellite nodes involved in the optimal path, and all potential links for other satellite nodes are closed. This method enables the routing process to proactively avoid high-risk areas during dynamic network changes, while simultaneously achieving energy-saving optimization by activating extended links on demand, achieving zero-risk transmission without increasing the overhead of multiple protection paths.

[0023] To upgrade risk assessment from qualitative description to quantifiable and comparable numerical results, avoiding biases caused by subjective judgments and making satellite node risk determination more objective and accurate, in a more preferred embodiment of this invention, in step S1, each of the four dimensions—space, time, technology, and environment—is broken down into quantifiable indicators. Each quantifiable indicator is then weighted to obtain a satellite node risk value. Fuzzy comprehensive evaluation is used to quantify the eavesdropping risk of satellite nodes from these four dimensions. The spatial dimension primarily considers the relative position of the attacker and the relay satellite, as well as the distribution density of ground listening stations. The temporal dimension focuses on the duration of the continuous connection of the satellite-to-ground link. The technological dimension assesses encryption strength and key update frequency. The environmental dimension involves the impact of atmospheric attenuation and background noise on signal interception. Through this model, the system can transform complex physical environmental factors into specific risk scores and classify satellite nodes into low-risk or high-risk states, providing a quantitative basis for subsequent secure routing. This risk value can be updated at different time slices, allowing it to reflect the dynamic changes in risk of the constellation under different orbital positions and environmental conditions.

[0024] Within each snapshot, the system considers not only physically connected adjacent links but also all satellite pairs within the optically visible range that meet the establishment conditions as potential extended links, incorporating them into the topology graph. To reflect risk differences, the system maps the satellite node risk values ​​calculated in step S1 to the weights of virtual links, for example, using the average risk values ​​of the nodes at both ends of the link as the risk weight of that link. In this way, links connected to high-risk satellites are assigned extremely high weights, causing the routing algorithm to naturally tend to avoid these high-risk nodes when searching for paths. In a more preferred embodiment of the invention, in step S2, a virtual fully connected topology is constructed as graph G(V, E), where each satellite node V is connected to a link E. The actual distance between adjacent satellites is calculated using the real-time coordinates of the satellite nodes and compared with the maximum effective transmission distance of the satellite communication link. If the actual distance between two satellites is less than or equal to the maximum effective transmission distance, and the communication link is unobstructed (e.g., without other satellites or space debris blocking it), it is determined to be a physically connected adjacent link, and this link is included in the link set E of the topology graph. The optical visibility determination is based on satellite attitude parameters and the field of view of the optical payload. The line of sight between two satellites is calculated. If the line of sight is unobstructed (e.g., by space debris or other satellites) and both satellites are within the field of view of each other's optical payloads, then the satellites are considered optically visible. Establishment conditions verify the communication compatibility of the two satellites, including but not limited to: consistent communication frequency bands, matching optical payload power, and signal transmission delay meeting a preset threshold (preferably ≤ 50ms). Satellite pairs meeting all these conditions are considered potential extended links and included in the link set E of the topology graph. In the topology graph G(V, E), each satellite node V has links to all other satellite nodes, i.e., virtual full connectivity. The link set E includes both types of links without omission. The risk values ​​corresponding to satellite nodes V1 and V2 at both ends of each link E are extracted and denoted as R1 (risk value of V1) and R2 (risk value of V2). The average risk value of the nodes at both ends of the link is used as the risk weight of the link, calculated as: Link weight W = (R1 + R2) / 2. If the risk value of a satellite node at one or both ends of a link is extremely high, for example, exceeding a preset risk threshold, it can be multiplied by a weighting coefficient, preferably 1.2-1.5, based on the average value. This further amplifies the weight of high-risk links, ensuring the routing algorithm prioritizes avoiding high-risk nodes. Weight calculations are performed on all links E one by one, and the weight information is bound to the links, updating the topology graph G(V, E) so that each link carries a unique risk weight parameter. The system automatically verifies the completeness of the topology graph, ensuring all satellite nodes are included in V, each node has a link connection to other nodes, link selection meets preset conditions, and weight calculations are accurate. If any omissions or errors exist, the system automatically returns to the corresponding step for reprocessing.After successful verification, the topology graph G(V,E) is output to the subsequent routing algorithm module to provide basic topology support for routing path search.

[0025] To calculate K candidate paths from satellite node i to satellite node j and select the shortest path as the output, in a more preferred embodiment of the invention, in step S3, the K-Shortest Paths (KSP) algorithm is used to calculate K candidate paths from satellite node i to satellite node j, and then the shortest path is selected as the output from these K candidate paths. Generating K candidate paths through the KSP algorithm, rather than a single path, effectively avoids routing interruptions caused by sudden satellite link failures, signal obstruction, or sudden changes in node risk. When the optimal path cannot communicate normally, it can quickly switch to other candidate paths, improving the stability and anti-interference capability of the satellite network routing. Shortest path selection optimizes communication efficiency by selecting the shortest path from the K candidate paths, which can minimize the signal transmission distance between satellite nodes i and j, reduce transmission delay, reduce signal attenuation, and improve data transmission rate and communication quality, especially suitable for mission scenarios with high real-time requirements in satellite networks. Since satellite nodes are in a high-speed motion state and the topology map is dynamically updated with snapshots over time, the KSP algorithm can quickly respond to topology changes. For example, for confidential services, the Energy-Efficient Survivable Routing (EESR) algorithm first removes all satellite nodes marked as high-risk from the virtual fully connected topology, generating a secure subgraph. Then, it runs a shortest path algorithm on this subgraph, using risk weights to ensure that the selected path completely avoids high-risk areas at the physical layer. For ordinary services, it directly searches for the path with the fewest hops across the entire network. Figure 1 The routing results of the EESR algorithm compared with the 1+1 algorithm are shown. It can be seen that in this case, the 1+1 algorithm cannot play a protective role because there are high-risk satellites on both the primary and backup paths, while EESR can flexibly avoid the threat of high-risk satellites.

[0026] To accurately collect data, quantify calculations, and standardize processing, the two indicators are transformed into weighted quantitative values ​​to support the calculation of satellite node risk values. In a more preferred embodiment of this invention, the spatial dimension includes the relative position of the attacker and the relay satellite, and the distribution density of ground listening stations. Real-time spatial coordinate data of the relay satellite and potential attackers is collected via monitoring payloads such as radar and optical detectors onboard the satellite, and the ground telemetry and control system. This includes the relay satellite's real-time latitude and longitude, orbital altitude, and other orbital coordinates, as well as the real-time coordinates of the attacker, such as an enemy satellite, space debris, or malicious spacecraft. The collection frequency is synchronized with the time snapshot in step S2, preferably 10-60 seconds per snapshot, to ensure data timeliness. Based on the collected two-way coordinate data, the straight-line distance d between the attacker and the relay satellite is calculated using a spatial distance calculation formula.

[0027] Where (x1, y1, z1) are the coordinates of the relay satellite, and (x2, y2, z2) are the coordinates of the attacker. The calculation result is rounded to two decimal places and used as the basic quantification data. A relative distance threshold is set, which can be flexibly adjusted according to the relay satellite's protection capabilities and the attacker's type. The relative distance is converted into a quantified threat value, for example, with a value range of 0-10, where a higher value indicates a higher threat.

[0028] (1) When the relative distance is less than the preset safety threshold, preferably 50km, it is judged as a high threat and the quantification value is assigned 8-10.

[0029] (2) When the relative distance is between the safety threshold and the warning threshold, preferably between 50km and 200km, it is judged as a medium threat and the quantification value is assigned to 4-7.

[0030] (3) When the relative distance is greater than the warning threshold, preferably greater than 200km, it is judged as low threat and the quantitative value is assigned to 0-3. The calculated relative distance and quantitative threat value are verified to eliminate abnormal values ​​caused by coordinate acquisition errors and calculation deviations. If there are abnormalities, the coordinates are re-acquired and recalculated to ensure that the quantitative value of the indicator is accurate and reliable.

[0031] To determine link stability and the risk of attacks and interference, in a more preferred embodiment of this invention, the time dimension includes the duration of the continuous connection of the satellite-to-ground link. A longer continuous connection duration indicates a longer link exposure time and a higher risk. The connection status of the satellite-to-ground link is monitored in real time via a relay satellite communication payload and a ground-based telemetry and control system. The monitoring frequency is synchronized with the time snapshot in step S2, synchronously recording the start and end times of each link connection to form a link connection time log. For the satellite runtime segment corresponding to the current time snapshot, valid connection records of the satellite-to-ground link are extracted, and the duration of a single continuous connection is calculated.

[0032] in, This is the start time of the link connection (accurate to the second). The current time is the link disconnection time; if the current link is in a continuous connection state, the current time is used as the link disconnection time. Calculate the duration of the real-time continuous connection.

[0033] To quantify the security protection capabilities of satellite communication links and assess the risk of data transmission being cracked or stolen, in a more preferred embodiment of this invention, the technical dimensions include encryption strength and key update frequency. The core of the environmental dimension is to quantify the degree of interference from the external natural environment on satellite signal transmission, and the risk of signal interception due to interference. The environmental dimension includes the impact of atmospheric attenuation and background noise on signal interception. Through the satellite communication system backend, core parameters such as the encryption algorithm type and encryption key length of the current satellite-to-ground and inter-satellite links are extracted to clarify the specific configuration of the encryption scheme. Based on the encryption key length and algorithm complexity, tiered thresholds are set, converting the encryption strength into a standardized quantized value ranging from 0 to 10. A higher value indicates stronger protection and lower risk. For example, for AES-256 algorithm key length ≥ 256 bits, the quantized value is 8-10; for key length between 128 bits and 256 bits, the quantized value is 4-7; and for key length < 128 bits, the quantized value is 0-3. The encryption algorithm's operating status is monitored in real time. If the encryption scheme is adjusted or the key length changes, the quantized value is updated synchronously to ensure consistency with the actual protection capability. The satellite key management system records the time nodes and update cycles of key updates, and statistically analyzes the number of key updates per unit time, for example, synchronized with time snapshots, optimizing the number of key updates per hour. An update frequency threshold is set, converting the update frequency into a standardized quantified value, for example, ranging from 0 to 10. A higher value indicates more frequent updates and a lower risk of being cracked. Specifically, an update frequency ≥ 4 times / hour corresponds to a quantified value of 8-10; an update frequency of 1-4 times / hour corresponds to a quantified value of 4-7; and an update frequency < 1 time / hour corresponds to a quantified value of 0-3. Key update records are tracked in real time. If the update cycle is adjusted or the update frequency is abnormal, the quantified value is promptly verified and corrected to ensure the accuracy of the indicators.

[0034] To ensure complete synchronization between the satellite node risk value update cycle and the time snapshot division cycle in step S2, and to guarantee that a risk value update process is initiated synchronously with each new time snapshot, in a more preferred embodiment of this invention, the satellite node risk value is dynamically updated with each time snapshot to reflect the dynamic changes in risk of satellite nodes under different orbital positions and environmental conditions. For each new time snapshot, the quantified values ​​of all quantifiable indicators across the four dimensions of space, time, technology, and environment are re-collected and calculated. Based on the standardized quantified values ​​updated for each dimension, the weights preset in step S1 are used to recalculate the weighted summation, yielding the real-time risk value of the satellite node corresponding to the current time snapshot, overwriting the risk value data from the previous snapshot. The updated satellite node risk value is verified to confirm that the updates of each dimension indicator are correct and the weighted calculation is error-free, eliminating outliers during data collection and calculation. Simultaneously, the risk value and indicator data corresponding to each time snapshot are stored to form a dynamic risk value change log for subsequent traceability and trend analysis. The updated satellite node risk value is output to the topology construction module in step S2 in real time, ensuring that the link weights mapped in step S2 remain consistent with the satellite risk status of the current snapshot.

[0035] To avoid energy waste caused by establishing too many actual laser links at the physical layer, this invention establishes physical links only for the node pairs involved in the final selected path after completing the path calculation in the virtual graph, while keeping other potential links closed.

[0036] This invention also discloses a system for an energy-saving and robust routing method for satellite optical networks based on extended inter-satellite links, as described above. The system includes... The building unit is used to construct a comprehensive energy efficiency eavesdropping risk assessment model, which can use the fuzzy comprehensive evaluation method to quantify the eavesdropping risk of satellite nodes from four dimensions: space, time, technology and environment to obtain the risk value of satellite nodes; The weight setting unit, within each time snapshot, uses satellites within the optically visible range that meet preset conditions as extended links to include in the topology of physically connected adjacent links, thereby completing the construction of a virtual fully connected topology, and uses the average risk value of the satellite nodes at both ends of the link as the risk weight of the link. The path optimization unit is used to remove all satellite nodes marked as high risk from the virtual fully connected topology, generate a safe subgraph, and obtain the optimal path in the safe subgraph using the shortest path algorithm at the cost of the risk weight. The data transmission unit is used to select the satellite nodes involved in the optimal path to establish physical links, and to keep the potential links of the remaining satellite nodes closed.

[0037] In this system, the construction unit employs a fuzzy comprehensive evaluation method to quantify the risk of satellite node eavesdropping from four dimensions: space, time, technology, and environment, thereby obtaining the risk value of each satellite node. The weight setting unit, within each time snapshot, incorporates satellites within the optically visible range that meet preset conditions as extended links into the physically adjacent link topology, constructing a virtual fully connected topology and using the average risk value of the satellite nodes at both ends of the link as the link risk weight. The path optimization unit eliminates high-risk satellite nodes from the virtual fully connected topology to generate a secure subgraph, and obtains the optimal path in the secure subgraph using a shortest path algorithm at the cost of risk weight. The data transmission unit activates the satellite nodes involved in the optimal path to establish physical links, while keeping the potential links of the remaining satellite nodes in a closed state. By introducing multi-dimensional risk assessment and extended link technology, this invention overcomes the high energy consumption drawbacks of traditional multi-path redundancy protection, effectively reducing network energy consumption through an on-demand activation mechanism. Simultaneously, by actively avoiding high-risk nodes, this invention ensures that the risk of path eavesdropping for confidential services remains at an extremely low level, offering superior security compared to traditional solutions that rely solely on backup paths. Furthermore, the introduction of extended links greatly increases the flexibility and connectivity of network topology, giving routing algorithms more path options. This effectively reduces service congestion rates and improves network resource utilization efficiency while ensuring security and energy conservation.

[0038] The present invention also discloses a machine-readable storage medium storing instructions for causing a machine to execute the energy-saving and damage-resistant routing method for satellite optical networks based on extended inter-satellite links as described in any of the preceding claims.

[0039] In the above embodiments, the descriptions of each embodiment have different focuses. Parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments. The above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A power-saving and damage-resistant routing method for satellite optical networks based on extended inter-satellite links, characterized in that, The energy-saving and damage-resistant routing method for satellite optical networks based on extended inter-satellite links includes: Step S1: Construct a comprehensive energy efficiency eavesdropping risk assessment model, and use the fuzzy comprehensive evaluation method to quantify the eavesdropping risk of satellite nodes from four dimensions: space, time, technology and environment to obtain the risk value of satellite nodes; Step S2: In each time snapshot, satellites within the optically visible range that meet preset conditions are included as extended links in the topology of physically connected adjacent links to complete the construction of a virtual fully connected topology. The average risk value of the satellite nodes at both ends of the link is used as the risk weight of the link. Step S3: Remove all satellite nodes marked as high risk from the virtual fully connected topology to generate a safe subgraph. In the safe subgraph, the shortest path algorithm with the risk weight as the cost obtains the optimal path. Step S4: Select the satellite nodes involved in the optimal path to establish physical links, and keep the potential links of the remaining satellite nodes closed.

2. The energy-saving and damage-resistant routing method for satellite optical networks based on extended inter-satellite links according to claim 1, characterized in that, In step S1, the four dimensions of space, time, technology and environment are each broken down into quantifiable indicators, and then each quantifiable indicator is weighted to obtain the satellite node risk value.

3. The energy-saving and damage-resistant routing method for satellite optical networks based on extended inter-satellite links according to claim 1, characterized in that, In step S2, a virtual fully connected topology is constructed as graph G(V, E), with each satellite node V connected by a link E.

4. The energy-saving and damage-resistant routing method for satellite optical networks based on extended inter-satellite links according to claim 1, characterized in that, In step S3, the KSP algorithm is used to calculate K candidate paths from satellite node i to satellite node j, and then the shortest path is selected from the K candidate paths as the output.

5. The energy-saving and damage-resistant routing method for satellite optical networks based on extended inter-satellite links according to claim 1, characterized in that, The spatial dimension includes the relative positions of the attacker and the relay satellite, as well as the distribution density of ground listening stations.

6. The energy-saving and damage-resistant routing method for satellite optical networks based on extended inter-satellite links according to claim 1, characterized in that, The time dimension includes the duration of continuous connection of the satellite-to-ground link.

7. The energy-saving and damage-resistant routing method for satellite optical networks based on extended inter-satellite links according to claim 1, characterized in that, Technical dimensions include encryption strength and key update frequency; environmental dimensions include the impact of atmospheric attenuation and background noise on signal interception.

8. The energy-saving and damage-resistant routing method for satellite optical networks based on extended inter-satellite links according to any one of claims 1-7, characterized in that, The risk value of the satellite node will be dynamically updated with each snapshot to reflect the dynamic changes in risk of the satellite node under different orbital positions and environmental conditions.

9. A system for an energy-saving and damage-resistant routing method for satellite optical networks based on extended inter-satellite links as described in any one of claims 1-8, characterized in that, The system includes, The building unit is used to construct a comprehensive energy efficiency eavesdropping risk assessment model, which can use the fuzzy comprehensive evaluation method to quantify the eavesdropping risk of satellite nodes from four dimensions: space, time, technology and environment to obtain the risk value of satellite nodes; The weight setting unit, within each time snapshot, uses satellites within the optically visible range that meet preset conditions as extended links to include in the topology of physically connected adjacent links, thereby completing the construction of a virtual fully connected topology, and uses the average risk value of the satellite nodes at both ends of the link as the risk weight of the link. The path optimization unit is used to remove all satellite nodes marked as high risk from the virtual fully connected topology, generate a safe subgraph, and obtain the optimal path in the safe subgraph using the shortest path algorithm at the cost of the risk weight. The data transmission unit is used to select the satellite nodes involved in the optimal path to establish physical links, and to keep the potential links of the remaining satellite nodes closed.

10. A machine-readable storage medium, characterized in that, The machine-readable storage medium stores instructions for causing the machine to execute the energy-saving and damage-resistant routing method for satellite optical networks based on extended inter-satellite links as described in any one of claims 1-8.

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