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Even if you implement frequency hopping it'll do nothing for China blocking it. The end users need to hop to the same frequencies to receive the signal, which m
by avar 7y ago
Even if you implement frequency hopping it'll do nothing for China blocking it. The end users need to hop to the same frequencies to receive the signal, which means that a jammer can do the same.
This sort of thing works for militaries (e.g. for GPS) because you can assume that the receivers are secure, i.e. they're guarded by people carrying guns.
That's not really a viable plan when a hostile state can just buy a receiver with the built-in hopping algorithm from a retailer.
- dsl 7y agoIt works for (the US) military because they assign unique NET codes to groups and unique keys to transceivers. The frequency schedule is seeded using part of the key, the NET, and the day. The system is actually designed with the assumption that transceivers will fall in to enemy hands. Starlink could implement something similar where the schedule is seeded using a key stored on the device, the day, and the receivers serial number (or other unique value). Supporting a million receivers is the same as supporting one, it is basically just one more input to a hash function.