View Full Version : Explain GPS to me.

09-15-2011, 03:30 PM
Could someone explain or tell me were to find info.

I dont understand how to navigate between 2 GPS points.

If my bot is at one point and I want to go to another point how do I do that?


09-15-2011, 03:50 PM
Her is some interesting reading from DPRG.
While it talks about a specific challenge the article includes all the theory and math you might need.


Have fun

09-15-2011, 03:52 PM
If my bot is at one point and I want to go to another point how do I do that? thanks

Good one... google robomagellan and start searching

09-15-2011, 03:54 PM
Unless your bot has a digital compass, I guess it need to start driving straight forward and check if it's going at an angle to destination and start steering.

09-15-2011, 04:15 PM
Bear in mind that the average GPS receiver has positional accuracy measured in meters. So without a specialized or military GPS, a bot will be able to navigate from one end of a street to the other, but will be totally lost in the backyard.

Duane Degn
09-15-2011, 06:42 PM
I'm working on a GPS project myself. I started with GPS Float Demo (http://obex.parallax.com/objects/405/). I modified it to use Lonesock's F32 which saves a cog. I also use a four port serial object that save a second cog.

The price of fewer cogs came at messier code. I had to move many of the child objects into the parent object so I could use a single serial driver.

GPS Float has methods for computing course and distance. As other's have said, you'll need additional navigational aids besides GPS to keep your robot on course.

I plan on starting a thread today about my project (GPS Pedometer).


WBA Consulting
09-15-2011, 09:04 PM
Not sure if it will help at all, but I posted some Handheld GPS code (http://forums.parallax.com/showthread.php?133806-Propeller-Based-Handheld-GPS-with-Full-Code) that does some "great circle" math for distance and direction finding.