[Robotgroup] GPS modules

[Eric Lundquist]

Sparkfun has a selection of different GPS modules:
http://www.sparkfun.com/commerce/categories.php?cPath=4_86

Futurelec has one:
http://www.futurlec.com/GPS.shtml

Never heard of these guys:
http://www.deluoelectronics.com/category/19-GPS_OEM_Modules

These guys have an 802.11 standalone gps server that is pretty interesting.
http://www.navsync.com/GPS_integrated.html

One of the things I am learning about GPS on my "seeker" robot is that GPS
doesn't seem to provide good heading data at slow or stopped speeds.  I am
in the process of adding a digital compass module to get accurate
orientation data.  The module I am looking at is this one:
http://www.sparkfun.com/commerce/product_info.php?products_id=244
It has a real SPI interface, unlike the Parallax one that has a weird 4 and
11 bit synchronous interface. What I have not been able to find is a good
reference on how to do tilt compensation. This unit provides x, y, & Z axis
magnetic field strength but I can't find a good reference anywhere that
tells me how to integrate the 3 axis magnetic field strengths to give me
direction.

- Eric



On 7/16/07, thecomers at juno.com <thecomers at juno.com> wrote:
>
> I am looking at acquiring some GPS modules to use on mobile platforms
> at Austic Community College. We wanted ones that are suitable for use
> with a microprocessor. I found the following units. Does anyone know
> of other suitable units or have recommendations?
>
> Parallax GPS $70
> http://www.parallax.com/detail.asp?product_id=28146
> 4800 bps, 8 data bits, no parity, 1 stop bit, non-inverted, serial
> TTL.
>
> DS-GPM Global Positioning System, $395
> http://acroname.com/robotics/parts/R217-TR-GPM.html
> IIC or RS232 communications
>
> I have seen some robotics projects that use Garmin GPS moules,
> including this one:
>
> Garmin 15 $42.50
> https://buy.garmin.com/shop/shop.do?pID=6449
> serial 4800 baud
> Needs antenna, like a:
> Garmin GA27c $60 might find a cheaper one
>
> Thanks,
> Bob Comer
>
>
>
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