It's not brilliant for it.  We have a 20Hz output GPS unit, but that doesn't
always mean that the data is really calculated 20 times per second.  We
produce a data logger which combines GPS data with data from accelerometers
and enables you to calculate lap times, braking points and so on, it works
better with a 1Hz GPS unit and 100Hz accelerometer data than just with a
20Hz GPS unit (much cheaper to produce as well).  Search for DL90 Data
Logger on Google for more info.

We see offsets of upto 2kph under hard acceleration and braking from the raw
GPS data compared to combined data or data from an optical speed sensor.

Regards,

Martin

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Martin Darwin
Sent: 22 November 2002 17:21
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [OT]: While on the subject of GPS...


How good (accurate) is GPS during hard braking, cornering and acceleration
(of a normal road car -- not a race car)? I had thought if you could get a
GPS uint with a 10Hz update rate it would be pretty good for calculating
lap times, lines through corners, braking points, etc.. of a car on a race
track.

MD

On Thu, 21 Nov 2002, John Ferrell wrote:

> The Sony/Etak unit seems to be very consistant with the speed indication.
It
> is always a little higher than my vehicals speedometer. As far as I can
tell
> with highway mile markers, it is accurate.
>
>
> John Ferrell
> 6241 Phillippi Rd
> Julian NC 27283
> Phone: (336)685-9606
> Dixie Competition Products
> NSRCA 479 AMA 4190  W8CCW
> "My Competition is Not My Enemy"
>
>
>
> >
> >
>
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