[APBeta] [OT] GPS

[Tony Barry]

Hello Paul,

The correct link is
http://www.siliconchip.com.au/cms/A_111445/article.html

Sorry for the previous error. My bad.

Yes, within a microcontroller you could get the accuracy.  In a PC /  
Mac the OS would never let you get such accuracy.

Regards,
Tony Barry


On 05/07/2009, at 8:13 AM, Paul Rodman wrote:

>
>
> 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.
>
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