A Design and Implementation of CSSDS Proximity-1 Protocol

To improve the amount of data transmission of mars missions, a new protocol, Proximity-1 Space Link Protocol, is developed by Consultative Committee for Space Data Systems (CCSDS) in order to provide short-range communications among landers, probes and orbiting relays. The implementation and testing of the Data Link Layer (DLL) of the Proximity-1 are mainly discussed in this paper. The implementation, which consists of two Proximity-1 protocol units and one On-Board Computer (OBC), is able to start up a communication session with a remote entity, handle data exchange, and reconfigure the transceivers parameters if needed. A complete procedure of full-duplex mode is developed in this paper. And importantly, how to determine the transmission window size is focused on in order to improve the efficiency of the link and hence increase the effective data throughput. At last, a prototype of Proximity-1 is developed and verified on a FPGA platform.