Fault Tolerant Method for Spacecraft Bus Based on Virtual Memory

Abstract

In this paper, a fault-tolerant method of spacecraft bus chip based on virtual memory is proposed. This method applies the address mapping method of virtual memory technology. By means of self-detection and page management, it realizes the dynamic allocation and management of internal RAM pages in bus chip and achieves the purpose of fault tolerance. In detail, each message area in bus chip is called page. The page index table is defined to store the page state and give mapping for physical memory. CPU refreshes the page state in page index table by self-detection. When sending bus messages, CPU applies pages according to the page index table instead of writing physical memory directly. This method can recover the bus chip damage of onboard spacecraft.