lossylink

Overview ¶

Example: A lossy RF link, and how CCSDS telemetry copes

This example demonstrates how CCSDS protocols handle a noisy communication channel. A spacecraft transmits 20 telemetry packets over a simulated RF link that randomly drops and corrupts CADUs.

The ground station uses four CCSDS mechanisms to cope:

• Reed-Solomon FEC: corrupted frames are corrected before CRC check
• CRC-16 rejection: uncorrectable frames are detected and discarded
• Frame gap detection: dropped frames are identified via MC/VC counters
• FHP-based resync: after frame loss, the receiver re-synchronizes to the next packet boundary using the First Header Pointer

The transmission chain per CCSDS 131.0-B-5:

Frame (128 bytes) -> RS encode (128->160 bytes) -> Randomize -> ASM -> CADU
CADU -> ASM strip -> De-randomize -> RS decode (160->128 bytes) -> Frame

Run with: go run ./examples/lossylink/