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 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 2025-08-06.
^ "CCSDS Recommendation For Proximity-1 Space Link Protocol. Data Link Layer" (PDF). Retrieved 2025-08-06.
^ "CCSDS Recommendation For Proximity-1 Space Link Protocol. Physical Layer" (PDF). Retrieved 2025-08-06.
^ CCSDS Proximity-1 Communications Protocol Enables High-Speed Communication at Mars
^ "Phoenix Mars Mission FAQ". Retrieved 2025-08-06.

External links

Mars Relay Operations: Application of CCSDS Proximity-1 Space Data Link Protocol

[1] "CCSDS Recommendation For Proximity-1 Space Link Protocol. Coding And Synchronization Sublayer" (PDF). Retrieved 2025-08-06.

[2] "CCSDS Recommendation For Proximity-1 Space Link Protocol. Data Link Layer" (PDF). Retrieved 2025-08-06.

[3] "CCSDS Recommendation For Proximity-1 Space Link Protocol. Physical Layer" (PDF). Retrieved 2025-08-06.

[4] CCSDS Proximity-1 Communications Protocol Enables High-Speed Communication at Mars

[5] "Phoenix Mars Mission FAQ". Retrieved 2025-08-06.

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v t e Consultative Committee for Space Data Systems
Data compression	Images ICER JPEG JPEG 2000 122.0.B1 Data Adaptive Entropy Coder
Error Correction	Current Binary Golay code Concatenated codes Turbo codes Proposed LDPC codes
Telemetry command uplink	Command-loss timer Proximity-1 Space Link Protocol
Telemetry downlink	Spacecraft Monitoring & Control Beacon mode service
Telemetry general	Space Communications Protocol Specifications (SCPS): Performance Enhancing Proxy
Telemetry modulation systems	Current BPSK QPSK OQPSK Proposed GMSK
Frequencies	X band S band K_u band K band K_a band
Networking, interoperability and monitoring	Service-oriented architecture (Message Abstraction Layer)

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