Discussions

New RTK GPS on Indiegogo

Posted by Bill Piedra on May 1, 2015 at 8:40am

Reach: first affordable RTK GPS receiver

https://www.indiegogo.com/projects/reach-first-affordable-rtk-gps-receiver

Reach is for applications when your standard GPS with several meters accuracy just won’t cut it. It relies on RTK (real-time kinematics) technology to deliver centimeter level accuracy.

RTK was here for a long time, used mostly by surveyors and unaffordable to hobbyists and makers. If you needed centimeter precise positioning you had to spend thousands of dollars on an RTK system. With Reach we want to change that.

Reach runs open-source RTK processing software called RTKLIB written by Tomoji Takasu. Previously a computer was required to run RTKLIB, but now all RTKLIB features are available directly on Reach.

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Replies

Sha Zhou December 5, 2015 at 1:17pm

I already have one from Tersus.

I did this test with a 85cm square table in the backyard with half sky being covered by trees and house.
- andreas kellermann > Sha Zhou December 6, 2015 at 12:13am
  
  Impressive table test! I`m still messing around with my units. 7 green satelites on base and rover, but still no float/fix...Hmmm???
  
  Anyway, great to see that it "should" work.
  - Sha Zhou > andreas kellermann December 6, 2015 at 2:17pm
    
    You should get one from Tersus.
    - andreas kellermann > Sha Zhou December 7, 2015 at 2:15pm
      
      Depends...
      
      Tersus is 2x800$ isn`t it?
      
      Reach RTK is much smaller and if you combine a base (250$) with a Navio+ flight controller with RTK lib for the same price as a Pixhawk without GPS module... Then it`s a great deal.
      - Sha Zhou > andreas kellermann December 7, 2015 at 2:18pm
        
        No. High version Précis is $799, Tersus is $499.
        
        andreas kellermann > Sha Zhou December 7, 2015 at 2:29pm
        
        For rover and base module? Sorry, I find the website rather confusing. They should state much more clearly what exactly I should buy from them.
        
        How easy is the system to setup and run? Do you need an additional datalink or can it send correction data via Mavlink?
        
        Thanks
        
        RPM > andreas kellermann December 7, 2015 at 2:39pm
        
        I only see 799 swiss francs on their site for Precis.
        
        Tersus GNSS > RPM December 9, 2015 at 12:05am
        
        Sorry, Guys, we are just promoting the products. the website is just built from scratch.
        
        Usually you got L1 GPS RTK for the DIY users, but Precis is DUAL frequency L1/L2 RTK, which is much better than L1 only RTK because it can solve many problem under harsh situation, such as under trees, beside a high building. also Precis is triple system, it track GPS, China Beidou, and Glonass. the system is capable to do RTK even you see half sky!!
        
        You need wireless datalink, and two Precis to do the RTK. later version maybe come with wireless datalink, stay tune!
        
        We will add more the online store, such as wireless, antenna, and cable etc.
        
        any question just drop me line in the website: tersus-gnss.com
        
        Tersus GNSS > Tersus GNSS December 9, 2015 at 3:55am
        
        we are using in-house ASIC， and the RTK update rate is 10hz with all the L1/L2 GPS Beidou Glonass running. it consume lot's of MIPS to do RTK if you have dual frequency and three system enabled. it's almost 5 times observation data collecting and calculating than usual GPS L1 only RTK.
        
        andreas kellermann > Tersus GNSS December 9, 2015 at 1:29am
        
        Interessting. Emlid has told me that they will use Golonasss/Beju and later on Gallileo as well for their RTK solution. Since as you say the number of satelites with good reception is critical.
        
        The trouble with that is that the update rate of the GPS module usually goes down when you activate multiple systems. So out of curiosity, what modules are you using / what`s your rtk update rate with all systems enabled?