is there any way to lower my HDOP

Hi,

I have an APM25 with the ulblox gps, my HDOP numbers seem high. for example I have 9 sat's locked right now and my hdop is 1.7.

the lowest I have seen it is 1.4 with 10 sat's. I had read where peoples are around .9.

any idea's?

thanks

John

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

Join diydrones

Email me when people reply –

Replies

  • Actually with UBlox it's PDOP we see in MissionPlanner and logs etc. Not sure why it is called hdop because it is not. See this issue:

    https://github.com/diydrones/ardupilot/pull/644

    Regards

    Jani

  • http://http://en.wikipedia.org/wiki/Dilution_of_precision_%28GPS%29

    Per this entry regarding DOP : 1-2 is very good, 2-5 is good. Yes, 1 is Ideal but, for our purpose ??? I'll be comfortable is 2-3 will bring the vehicle back to pretty close to where we started.

  • Hi,

    Yes, I have been trying to have a better diet but but was just kicked out of junk food anonymous :)

    Thanks for the DOP link, I wasnt exactly sure what hdop was except for a measure of accuracy (horizontally) but I knew the lower number the better.

    I am not sure what the CRS value is, and havent really looked too much at the logs yet... Wow, I have so much to learn/read, I actually just found the Appendix area in the wiki for arducopter and arduplane and all the info in there...  It is overwhelming what these guys (you guys) have accomplished  I wish I would have learned of the arducopter's existence a long time ago.. for now I am playing catch up...

    as far as the u-center showing lower hdop, there must be some other factors in calculating the hdop  or maybe electrical noise from the components on the copter???

    thanks,

    John

  • I have the ublox GPS module outside my window, wires routed through the rubber seal and mission planner reports a hdop of 2.4. If I plug it out of the APM and plug it in a FTDI cable and run u-center, it reports 0.9-1.2.

  • I had a funny response regarding high fiber food, exercise, and low carbohydrate intake but...

    There have been several observations regarding the accuracy of the GPS but in general, the UBlox seems better in general.

    DOP - Dilution of Precision for those new to the concept.

    I looked over some of my logs and with the AC rev I am running, I only have a CRS value in the GPS line.

    What is yours?

    -=Doug

This reply was deleted.

Activity

DIY Robocars via Twitter
RT @TinkerGen_: "The Tinkergen MARK ($199) is my new favorite starter robocar. It’s got everything — computer vision, deep learning, sensor…
Nov 23
DIY Robocars via Twitter
Nov 23
DIY Robocars via Twitter
RT @roboton_io: Join our FREE Sumo Competition 🤖🏆 👉 https://roboton.io/ranking/vsc2020 #sumo #robot #edtech #competition #games4ed https://t.co/WOx…
Nov 16
DIY Drones via Twitter
First impressions of Tinkergen MARK robocar https://ift.tt/36IeZHc
Nov 16
DIY Robocars via Twitter
Our review of the @TinkerGen_ MARK robocar, which is the best on the market right now https://diyrobocars.com/2020/11/15/first-impressions-of-tinkergen-mark-robocar/ https://t.co/ENIlU5SfZ2
Nov 15
DIY Robocars via Twitter
RT @Ingmar_Stapel: I have now explained the OpenBot project in great detail on my blog with 12 articles step by step. I hope you enjoy read…
Nov 15
DIY Robocars via Twitter
RT @DAVGtech: This is a must attend. Click the link, follow link to read the story, sign up. #chaos2020 #digitalconnection #digitalworld ht…
Nov 15
DIY Robocars via Twitter
RT @a1k0n: Got a new chassis for outdoor races (hobbyking Quantum Vandal) but I totally didn't expect that it might cause problems for my g…
Nov 11
DIY Drones via Twitter
First impressions of the Intel OpenBot https://ift.tt/36qkVV4
Nov 10
DIY Robocars via Twitter
Nov 9
DIY Robocars via Twitter
Excellent use of cardboard instead of 3D printing! https://twitter.com/Ingmar_Stapel/status/1324960595318333441
Nov 7
DIY Robocars via Twitter
RT @chr1sa: We've got a record 50 teams competing in this month's @DIYRobocars @donkey_car virtual AI car race. Starting today at 10:00am…
Nov 7
DIY Robocars via Twitter
Nov 6
DIY Robocars via Twitter
RT @a1k0n: Car's view, using a fisheye camera. The ceiling light tracking algorithm gave me some ideas to improve ConeSLAM, and having grou…
Nov 5
DIY Robocars via Twitter
RT @a1k0n: To get ground truth I measured the rug, found the pixel coordinates of its corners, calibrated my phone camera with my standard…
Nov 5
DIY Robocars via Twitter
RT @a1k0n: @DIYRobocars is back in December, but outside. Time to reinvestigate ConeSLAM! I rigged up a quick and dirty ground-truth captur…
Nov 5
More…