Home PageFacebookRSS News Feed
PocketGPS
Web
SatNav,GPS,Navigation
Pocket GPS World - SatNavs | GPS | Speed Cameras: Forums

Pocket GPS World :: View topic - calculation of speed in GPS
 Forum FAQForum FAQ   SearchSearch   UsergroupsUsergroups   ProfileProfile   Log in for private messagesLog in for private messages   Log inLog in 

calculation of speed in GPS

 
Post new topic   Reply to topic    Pocket GPS World Forum Index -> Location Based Services (LBS)
View previous topic :: View next topic  
Author Message
learner71
Occasional Visitor


Joined: Jul 29, 2013
Posts: 8

PostPosted: Fri Oct 18, 2013 5:17 am    Post subject: calculation of speed in GPS Reply with quote

Hi,
In GPS module, i are getting information about
1. latitude and longitude
2. Time
3. Horizontal Estimated Positional Error
4. Heading
5. vertical speed
6. horizonatl speed
7. Altitude
8. Location uncertainty angle
9. Standard deviation of axis along
10. Standard deviation of axis perpendicular to

How can we calculate the velocity of GPS device based above information?
Can any one explain it? if possible with example.

Best Regards
Learner
Back to top
View user's profile Send private message
M8TJT
The Other Tired Old Man
The Other Tired Old Man


Joined: Apr 04, 2006
Posts: 10118
Location: Bexhill, South Sussex, UK

PostPosted: Fri Oct 18, 2013 9:11 am    Post subject: Reply with quote

The horizontal speed gives you the horizontal velocity probably in M/sec. If you are gaining or loosing height at the same time, you can use Pythagoras to calculate your velocity and angle to the horizontal/vertical and the heading reading gives your horizontal direction.

Bear in mind that the vertical accuracy of a GPS device is not as good as the horizontal.
It would have been good had you asked this question along with your others here

The use of the word 'heading', although in general use meaning direction of travel, it is not strictly true as that. The heading of an aeroplane (say) is the direction in which the pilot is pointing the aircraft. Its 'track' is the direction it is actually travelling in over the surface of the earth. The two may differ (considerably, in the case of a boat) due to cross winds or cross currents causing the aircraft/boat to drift off course and not track in the direction of their heading. You have to steer (head) into the wind/current enough to cancel the drift in order to maintain the wanted track.
Back to top
View user's profile Send private message
Lariliss
Occasional Visitor


Joined: Nov 05, 2021
Posts: 10
Location: UK

PostPosted: Fri Nov 05, 2021 5:24 pm    Post subject: Reply with quote

1. You should choose the sampling rate, according to precision needed and calculate using latitude and longitude (this is fair enough) to calculate the path length.

2. In case you need to calculate distance from point A to point B - use lat/lon(A) and lat/lon(B) with the same calculation.

And divide time, could be referred to number of samples.
Here is formula:
https://www.movable-type.co.uk/scripts/latlong.html

Here is calculator example:
https://www.nhc.noaa.gov/gccalc.shtml

Of course mind the coordinates system, map datum.
Back to top
View user's profile Send private message







Posted: Today    Post subject: Pocket GPS Advertising

Back to top
Display posts from previous:   
Post new topic   Reply to topic    Pocket GPS World Forum Index -> Location Based Services (LBS) All times are GMT + 1 Hour
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum

Make a Donation



CamerAlert Database

Click here for the PocketGPSWorld.com Speed Camera Database

Download Speed Camera Database
22.121 (04 Dec 24)



WORLDWIDE SPEED CAMERA SPOTTERS WANTED!

Click here to submit camera positions to the PocketGPSWorld.com Speed Camera Database


12mth Subscriber memberships awarded every week for verified new camera reports!

Submit Speed Camera Locations Now


CamerAlert Apps



iOS QR Code






Android QR Code







© Terms & Privacy


GPS Shopping