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I bet they don't, because they didn't know about it or didn't think of it.

I know GPS is a slow repeating stream (the ephemeris repeats every 30 seconds and the almanac every 12.5 minutes) but that probably came before fountain codes.



Speculation about the past is probably unnecessary.

Reed-Solomon/erasure codes have been in operations since the 1960s

https://en.wikipedia.org/wiki/Reed%E2%80%93Solomon_error_cor...


Although a repetition of any high-rate erasure code can act similarly to a fountain code, they aren't classed as such.

(or is it low-rate? one of those)



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