GPS Reading Inaccuracy Problem

I have APM2. I tried to verify the location of my GPS.

What I found out is that at the same location GPS reading gives different value even though I am not moving my APM, it is just a static location. 

So, the problem comes when I want to calculate the distance from one point to another waypoint. It gives inaccurate reading. Any idea to overcome this problem ?

You need to be a member of diydrones to add comments!

Join diydrones

Email me when people reply –

Replies

  • single point GPS is not suitable for this task,  you need differential GPS (SBAS, WAAS.) to get accuracy of 1m. then if you want the centimeter accuracy, you need RTK GPS. checkout our website: tersus-gnss.com; we are targeting low cost RTK for UAV. it's very stable and useful.

  • Hello,

    Would a differential gps option be possible using the gps on an android device, or external gps on a laptop (used as a base station with radio telemetry).  Here are the changes that would probably be needed in mission planner:

    The software could show where the gps sensor is showing the position of the user's base station to be.  The user could then manually correct the location of the base station in the software by telling the system where the base station is actually located.  Mission planner could then use this error, and send it via telemetry to the ardupilot for a correction in the location of the rover.  

     Since the radio telemetry could easily get the current gps location from the rover, the laptop or android base station could compensate, and provide a more accurate gps reading for the rover.  

    Thanks,

    Ryan

  • Futhermore, if you read the datasheet from MTK GPS that was used in APM2, it capable for AGPS to get more accurate reading. 

    Link here: https://store.diydrones.com/MediaTek_MT3329_GPS_10Hz_p/mt3329-01.htm

    -Support AGPS function ( Offline mode : EPO valid up to 14 days )

     

    Is there any library that I could use to enable this AGPS function ? Do I need to add extra hardware ?

  • Can I implement differential GPS to improve accuracy ? I read about the differential GPS in wiki, but just would like to know if this is possible with APM 2 integrated GPS module. 

  • I need gps to give accurate reading when its on the same location. The value varies when I put at static location. I looked at gps datasheet, the acccuracy is below than 3 meter. Does it mean under 3 meter I wont get accurate reading?
  • What kind of accuracy are you looking for? 

This reply was deleted.

Activity

Neville Rodrigues liked Neville Rodrigues's profile
Jun 30
Santiago Perez liked Santiago Perez's profile
Jun 21
More…