[ntp:questions] very confusing results though using pps and nmea
hal-usenet at ip-64-139-1-69.sjc.megapath.net
Wed Aug 13 22:42:10 UTC 2008
>Note that serial port nmea is liable to be out by up to 1/2 sec and to have
>a lot ( 10s of msec) jitter on it, since the end of the string received by
>a slow serial port ( eg at 4800Bd, it takes an nmea sentence of about 60
>characters 1/8 of a second to be delivered and will have a jitter of few
>characters in length-- or about 10ms jitter).
That sort of jitter can easily be corrected.
Has anybody looked at a scope to see if the leading edge of a NMEA
string looks stable?
These are my opinions, not necessarily my employer's. I hate spam.
More information about the questions