3 ms·

Spread spectrum, and especially pseudo-random noise codes are pretty hard to detect i think https://en.wikipedia.org/wiki/Direct-sequence_spread_spectrum https:

• lazide 3y ago
  The more random it is, the harder it is to have certainty, but at high enough transmission rates and powers the raised noise floor is impossible to miss and is definitely something that can be triangulated. If a normal radio transmission is a point light of a specific color, truly random spread spectrum is a grey glow. Direct sequence spread spectrum being many different color flashing lights here, I guess.