Reliable Data Transmission Method for Space TT&C Services Based on the Space Short Message System

Space network systems with inter satellite links or multi-beam cross coverage provided by LEO satellite constellations, MEO navigation satellite systems, and GEO communication satellites can offer continuous short message transmission services for LEO spacecraft. Due to the high end-to-end packet loss rate caused by the high bit error rate and data packet congestion because of the limited storage capacity of space-based devices, this paper proposes an Adaptive Forward Packet Loss Recovery algorithm for space TT&C data based on Beidou-3 short message system. The simulation results show that under the transmission condition of CCSDS AOS transmission frame carrying space TT&C data, 892-bytes VCDU requires 14 short messages (about 60-bytes payload length) to carry. Under the condition of 95% delivery success rate of short message system, the success rate of whole frame recovery without compensation and only out-of-sequence correction is about 49%. The whole frame recovery success rate of the Adaptive Forward Packet Loss Recovery algorithm is improved to at least 85%, and the system performance is improved to not less than 70%, which can ensure real-time transmission and effectively improve the reliability of space TT&C data transmission based on short message system.