Proximity-1 Space Link Protocol

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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 400 MHz 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.


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

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