LEO satellite network robust routing system and method based on DDR cache

By introducing a DDR cache mechanism into the LEO satellite network, the data loss problem caused by laser inter-star link jitter is solved, data fault-tolerant transmission is realized, and communication stability and efficiency are improved.

CN120498514APending Publication Date: 2025-08-15INNOVATION ACAD FOR MICROSATELLITES OF CAS +1
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Patent Information

Application Number
CN202510751063.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-06-06
Publication Date
2025-08-15

AI Technical Summary

Technical Problem

The existing technology has not effectively solved the problems of packet loss and communication instability caused by laser inter-star link jitter in the LEO satellite constellation network.

Method used

The LEO satellite network robust routing system based on DDR cache is adopted. By integrating DDR memory on the FPGA, data transmission is monitored in real time and stored in the cache when the link is interrupted, and the link routing is back to continue transmission. The modular design and cache mechanism are used to achieve fault-tolerant data transmission.

Benefits of technology

It significantly reduces the data packet loss rate, provides more stable and reliable communication services, improves the performance and efficiency of LEO satellite networks, and enhances the scalability and maintenance of the system.

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Abstract

The invention discloses an LEO satellite network robust routing system based on DDR cache. The LEO satellite network robust routing system comprises a field programmable gate array (FPGA) and a central processing unit (CPU). Two double-rate synchronous dynamic random access memories (DDRs) are further integrated on the FPGA, when data are transmitted into the FPGA, the FPGA monitors the data transmission process in real time, and the data to be transmitted are stored in the DDRs before the data are sent; through a cache mechanism, when link interruption is detected, the FPGA notifies the CPU and requests a new routing table; during transmission of the laser from the FPGA, data will be transmitted from a cache of the DDR according to a new routing table. By introducing a cache-based routing method, when a laser inter-satellite link is unstable, data can be cached in a cache, and the data can be continuously transmitted after the link route is converged again, so that the packet loss rate is reduced. According to the scheme, the fault-tolerant capability is high, more stable and reliable communication service can be provided, and the performance and efficiency of the LEO satellite network are remarkably improved.
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