How to build my own DGPS

Hello,

I'm trying to build an autonomous Qudrotor that will use DGPS to get accurate possition.

I'm using the "Mikrokoper" body and the Gluonpilot controller.

I have two "Trimble Lassen IQ" GPS receivers. I've find out that those cards are capable of outputting the raw data  and can get RTCM SC-104.

Actually I don't know where to start to I'll start with a few quastions:

 

1) If the GPS receiver can get RTCM SC-104 signals, does it means that if I will create such signal using the raw data from the base station, the rover's card would do the correction by himself?

 

2) How can I create RTCM correction message from the base station raw data? Is it possible to do it?

 

3) In case that the above steps are too complicate to achieve, what kind of GPS receivers are

recommending to  build a DGPS?  What kind of communication is recommending to  transmit the GPS data from the base station to the rover? (XBee will work?)

 

Thanks,

Lior

 

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

Join diydrones

Email me when people reply –

Replies

  • Hey friend, i am little confuse about this question but i think i have some solutions to share, www.samvibe.com we can see at this website may be it's helpful, what i find is, we can make our own radio station and from here we can radio stations with using advance technology. I hope it will solve your and many people who wants to find this types of information's.

    • HEllo lokendra kharel ji. 

      Ma tapai sanga k hi kura garnu thiyo DGps ko barema?? ma tapailai personally kasari kura garna sakchu. 

      my email jhabindra@jbnu.ac.kr 

  • Hi Lior,

    Hope you have solved Trimble iQ lassen raw data output.
    I started programming it but no success at moment.

    take a look on this thread:
    http://diydrones.com/profiles/blogs/centimeter-level-precision-gps-...

    regards,

    julio

  • Also, take a look at RTKLib (http://www.rtklib.com/) which is a library for computing precision (<1 cm) position solutions from raw data received from more than one GPS receiver.

    Hope this helps,

    Radu

    RTKLIB: An Open Source Program Package for GNSS Positioning
  • I had previously commented on Tom Kent's page to the effect that some amateur radio folks put together a DGPS reference station a while back using Motorola Oncore GPS, which the UT+ model supported "site survey" mode. A survey took about 3 hours but then you had your own reference.
    You can still find the HW docs here: http://www.tapr.org/gps_vpib.html
    and the DGPS C (RTCM) code here: http://www.tapr.org/software_library.php?dir=/gps/DGPS/N8PXW   Control software with site survey mode is here:http://www.tapr.org/gps_tac32.html
    You can also find these old GPS units on ebay, you are probably better off with something newer.  I plan to use Ublox LEA-6T-0 (precision timing, 5Hz,raw data available for RTCM) for the base station, and probably LEA-6S or -6A for the rover.

    • Hi Darryl,

      I realise you posted this a long time ago but it's relevant to what I'm doing now. I recently acquired a LEA6T-0 chip (with the evaluation kit) and have managed to get coordinates to within 40cm of reference points with post processing of regional correction data available in my country. 

      How did you get on with yours? Did you ever get into real time corrections going? I'm interested in using this chip as a base to generate my own on-site correction data, and feed that wirelessly to my UAV. 

      Cheers,

      Mike

This reply was deleted.

Activity

DIY Robocars via Twitter
RT @SmallpixelCar: Today at @RAMS_RC_Club for @diyrobocars. Used @emlid RTK GPS and @adafruit @BoschGlobal IMU. Lap time 28s https://t.co/R…
4 hours ago
DIY Robocars via Twitter
May 15
DIY Robocars via Twitter
May 14
DIY Robocars via Twitter
May 13
DIY Robocars via Twitter
RT @f1tenth: Say hi to our newest #F1TENTH creation for @ieee_ras_icra next week in Philly. It’s going to be huge! 😎 🔥 @AutowareFdn @PennEn…
May 13
DIY Robocars via Twitter
May 11
DIY Robocars via Twitter
May 8
DIY Robocars via Twitter
RT @SmallpixelCar: Noticed my car zigzagged in last run. It turned out to be the grass stuck in the wheel and made the odometry less accura…
May 8
DIY Robocars via Twitter
RT @SmallpixelCar: Test my car. RTK GPS worked great. Thanks @emlid for their support. https://t.co/EkQ6qmjmWR
May 8
DIY Drones via Twitter
RT @chr1sa: @kane That's @diydrones circa 2009. Still have a box of those Canon cameras that we used to strap into planes, just like this.…
May 3
DIY Robocars via Twitter
RT @chr1sa: Our next @diyrobocars race is going to be outside at a real RC racetrack in Fremont on May 28. Fully autonomous racing, head-to…
Apr 30
DIY Robocars via Twitter
RT @f1tenth: Our Spring 2022 F1TENTH course @PennEngineers is coming to an end with a head-to-head race as a big finale. So proud of our st…
Apr 26
DIY Robocars via Twitter
RT @DanielChiaJH: I wrote a thing! Throughout the development of my @diyrobocars car I've been using @foxglovedev Studio to visualize and d…
Apr 23
DIY Robocars via Twitter
RT @SmallpixelCar: My new car for high speed. Low body, everything ( @NVIDIAEmbedded Jetson Xavier NX, @emlid RTK GPS, IMC) under the deck…
Apr 23
DIY Robocars via Twitter
Apr 21
DIY Robocars via Twitter
RT @f1tenth: F1TENTH Race training setup @PennEngineers for our upcoming ICRA2022 @ieee_ras_icra competition. @OpenRoboticsOrg @IndyAChalle…
Apr 21
More…