Proximity-1 Space Link Protocol

Proximity-1 Space Link Protocol is a short haul delivery communications protocol designed to establish a two-way communications link between a lander and an orbiter, negotiate data rate and communications mode, and reliably deliver data during short orbiter-to-surface contacts.

Developed by Consultative Committee for Space Data Systems and documented in a number of CCSDS Recommendations^[1]^[2]^[3] Proximity-1 is implemented on Mars Exploration Rovers, Mars Odyssey, Mars Reconnaissance Orbiter, Mars Express^[4] as well as on Phoenix Mars Lander.^[5]

The frequency band used by this protocol is in the 70-centimeter band so as to reduce complexity of the ground craft, using these frequencies:

437.1000 MHz
440.7425 MHz
444.3850 MHz
448.0275 MHz

However, using this protocol over the standard CCSDS frequency bands is perfectly acceptable if the UHF allocation is not usable.

References

^ "CCSDS Recommendation For Proximity-1 Space Link Protocol. Coding And Synchronization Sublayer" (PDF). Retrieved 2017-05-22.
^ "CCSDS Recommendation For Proximity-1 Space Link Protocol. Data Link Layer" (PDF). Retrieved 2017-05-22.
^ "CCSDS Recommendation For Proximity-1 Space Link Protocol. Physical Layer" (PDF). Retrieved 2017-05-22.
^ CCSDS Proximity-1 Communications Protocol Enables High-Speed Communication at Mars
^ "Phoenix Mars Mission FAQ". Retrieved 2008-05-26.