[chbot] Kelvin: re: GPS Modules

[Charles Manning]

On Saturday 23 October 2010 01:57:34 Paul Davey wrote:
> or this?
>
> http://www.flytron.com/15-damnvision-gps-module.html

That looks v interesting.

I would not touch the 
http://www.trimble.com/embeddedsystems/lasseniq.aspx?dtID=overview&
with a barge pole because it lacks desirable characteristics.

There are many competing demands when designing a GPS receiver:
* Sensitivity: Ability to track when things get tough. The Trimble Lassen unit 
does not do well here.
* Update rate: Fast is good for some applications. Less important if a Kalman 
filter is being used to generate dynamics.
* Integrated antenna: Cheaper, smaller. Again, Lassen fails here.
* Accuracy
* Precision: 

Unfortunately many of the desirable characteristics are not specced on data 
sheets and need to be determined by testing.

-- Charles