In order to achieve the deterministic transmission of diverse data streams in a short time on the SpaceFibre network, the fine-grained low-latency deterministic scheduling algorithm with classification was proposed. According to the differentiated scheduling strategy, space tasks were divided into three types. For the efficient allocation of resources, the extended time-slot was introduced. The uniform distribution of time-slot without conflict reduced the average delay of data packets. To adapt to aerospace applications where payloads were connected with a network, the method generated scheduling vectors based on the network topology. The simulation model of the SpaceFibre network in OPNET was built to verify the effectiveness of the method. Experimental results show that the scheduling scheme generated by the method has better certainty than the classic scheduling based on priority and conflict-free consecutive scheduling; with the increment of the number of time slots, the average delay and jitter of each traffic are reduced, and the throughput is guaranteed. Therefore, the method has certain practical application value in aerospace engineering.

An optimal design of SpaceFibre node transmission system was proposed to meet the high bandwidth, high reliability and light weight requirements for the SpaceFiber link between satellite payloads. This design adopts an incremental calculation method based on frame accumulation to reduce the redundancy of computing circuits, and satisfies the timing requirements for error detection operations through a four-stage pipeline architecture. The module balances the use of hardware resources by sharing CRC (cyclic redundancy check). To improve reliability, the design adopts a two-layer control strategy with complete response. Resource-optimized FSM (finite-state machine) and storage architecture are built to simplify the implementation of the retransmission algorithm. A verification system at board-level with two nodes was implemented in XC7Z100FFG900-2 FPGA (field programmable gate array). The results show that the design satisfies the functions stipulated by the standard. Compared with similar design schemes, the maximum frequency is increased by 1.5 times, and supports up to 6.25 Gbit/s transmission rate. And resources of lookup tables and storage are reduced, while register resources are similar. The design provides a reference for the development of high-speed and reliable SpaceFibre codecs with independent intellectual property rights.