[LinuxPPS] Newbie alert!

[Bernhard Schiffner]

On Saturday 05 April 2008 21:01, Neal Probert wrote:
> Just joined up!  The website doesn't seem to have all the information
> I'm looking for.
>
> Is LinuxPPS being merged into the Linux kernel?  A little googling
> around tells me it is part of the 2.6.24 kernel now.
Not in there.
Perhaps merged (with a couple of other useful things) into 2.6.26.

> Is there a hardware hack and schematic for bringing in the PPS pulse
> from a serial GPS device to the DCD pin?  Would be nice to start seeing
> GPS on Mini-PCI or Mini-PCIe form factor.
Should be sold already. The problem is always  the connetion to the "clear 
sky" antenna.
In some GPS-chips is enough calculation-power left over for "enhanced" 
applications. Ask the GPS-receiver producer how to integrate your 
application. Energie-consumption is the real problem to solve. There 
are "PDAs" combined with GPS-receivers and WLAN already.

> Btw, I work for a major automotive company doing some Telematics R &
> D.   The LinuxPPS is integral to the Dedicated Short Range
> Communications (DSRC) radio synchronization used by US-DOT's VII project.
>
> A crucial issue is that we also need to start seeing GPS devices that
> give us better than 1m resolution with corrections.
Good luck!
Thinking of a car using DSRC, this car moves 20m/s. The GGA-message appears 
only every second...

The GPS information is calculated for the phase-center of the antenna. How 
long is the wiring you use? 

Which correction do you want to use (satellite based is sometimes already 
integrated into the receivers, terrestial RF, offline services)?

None of these topics is PPS-related ...

Bernhard