[APBeta] [OT] GPS
Paul Rodman
paul at ilanga.com
Sat Jul 4 15:13:49 PDT 2009
On Jul 4, 2009, at 1:12 PM, Tony Barry wrote:
> FYI
>
> Silicon Chip Magazine has a project for a GPS unit that should be
> good to about 250msec of real time.
>
> www.silchip.com.au
>
> (This is an unsolicited advert!)
>
> Regards,
> Tony Barry
>
> (who is trying to track the ISS on an LX90 and finding it **very**
> hard).
The problem is the unknown finite delay with getting the time back
from the GPS via a serial protocol. Specialised GPS units have a wired
pulse output that can synchronise the time to within a few
microseconds, with aid of some fancy hardware/firmware/software. I
looked at this once for a wireless network project where we wanted to
be able to tag all transmissions with a synchronised time stamp for
debugging purposes.
Paul R.
BTW, the link above didn't work.
More information about the APBeta
mailing list