對,美國的GPS 隻有接收,但中共北鬥早期有發射,美可監測己往氣球通訊方式
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tboy
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2023-02-23 03:41:23
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What is P code vs Y code GPS?
The P code is referred to as the Y code if encrypted
. Y code is actually the combination of the P code and a W encryption code and requires a DoD authorized receiver to use it.