TheBackShed.com

Home	JAQForum Ver 24.01
Log In or Join
Active Topics
Local Time 17:00 17 Jul 2025	Privacy Policy
Jump to

Notice. New forum software under development. It's going to miss a few functions and look a bit ugly for a while, but I'm working on it full time now as the old forum was too unstable. Couple days, all good. If you notice any issues, please contact me.

Forum Index : Microcontroller and PC projects : GPS speed and distance calculations

Page 3 of 3

Author

Message

Talbit
Senior Member

Joined: 07/06/2011
Location: Australia
Posts: 210

Posted: 05:07am 13 Dec 2011

Copy link to clipboard

Print this post

Doug,
I posted my latest clock today.
Talbit

Talbit

trippyben

Regular Member

Joined: 26/06/2011
Location: Australia
Posts: 91

Posted: 06:16pm 22 Dec 2012

Copy link to clipboard

Print this post

Been a while - but got the motivation to keep going with this project.

I ran the EM406 GPS module for a while and during a recent 2000km trip got it down to some pretty good results compared to the road tripmeter. The resulting software used the lat/long information from each set of data to calculate the distance rather than using the speed. I also ditched the angle correction as it added very little to the distance recorded, even in the forest.

In order to make the final product a bit more flexible I added a GPS 'fudge factor' so the tripmeter could be calibrated. On the trip I had it set to 1.016 - i.e. 1.6% added to each distance calculation to match the road book in use for that journey.

I've now obtained a couple of UP501 GPS modules that claim to do 5 or 10Hz navigation fixing. So far the 5Hz seems to work OK. The UP501 has an external battery backup for fast re-starts and you can save the required output settings into it's own eeprom to eliminate the need to set up the GPS every power up. Plus it's quite a bit smaller than the UP501 and fits in the case eaiser. Nice.

vk4tec

Senior Member

Joined: 24/03/2012
Location: Australia
Posts: 239

Posted: 11:56pm 24 Dec 2012

Copy link to clipboard

Print this post

GPS wander

Edited by vk4tec 2012-12-26

Andrew Rich VK4TEC
www.tech-software.net

MicroBlocks

Guru

Joined: 12/05/2012
Location: Thailand
Posts: 2209

Posted: 06:21am 25 Dec 2012

Copy link to clipboard

Print this post

That gps wander is actually pretty good, i have seen a lot worse.
May times it get worse when you park close to a wall (at least 45% of the sky obscured) or in a street with tall buildings you get problems because of canyoning. Edited by TZAdvantage 2012-12-26

Microblocks. Build with logic.

Page 3 of 3

Print this page

To reply to this topic, you need to log in.