Reply to post: Re: I seem to recall the GPS sats have a dither error parttern

Smartphone SatNavs to get centimetre-perfect GNSS receivers in 2018

Steve Todd

Re: I seem to recall the GPS sats have a dither error parttern

You're thinking of the SA (selective availability) code. This was a deliberate random wobble introduced into the civilian (C/A) signal, while military receivers used the more accurate P signal. SA was disabled in 2000 by presidential order, and the latest block III satellites aren't capable of transmitting it.

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