Reach is the next product from Emlid.

It's a RTK L1GNSS board with and IMU powered by an Intel Edison board (using linux - integrated WIFI and BT LE)

The module will be release around April at a price between 140-180$ (TBA).

Features

  • Intel Edison 
  • MPU9250 9DOF IMU
  • U-blox 8 Glonass/GPS/Beidou with raw data
  • Hot-start supercapacitor
  • USB OTG controller

Specifications

  • MCX antenna connector
  • Bright red/yellow/green LED
  • Extension 7-pin port with 3.3V logic level:
  • 1xUART, 1xI2C, 1xGPIO, 1xPPS
  • Compact size: 26 x 45 mm

more info http://community.emlid.com/t/reach-rtk-module-availability/212

Views: 6344


Moderator
Comment by Gary Mortimer on March 18, 2015 at 9:50am

Ohhhhh

Comment by Jerry Giant on March 18, 2015 at 10:44am
i guess there will be yocto distro or layer this time. or not.
running OSS stack on proprietary hardware is some people do, and some people selling proprietary hardware on OSS license, i don't like it.
i'd like to follow your steps by making a open hardware version of "navio+".
Comment by John Bond on March 18, 2015 at 5:00pm

The price is nice.  I'm sure leveraging RTKLIB helped there.

Multiple GNSS help RTK as will the IMU if that's eventually integrated into the code, but still the biggest performance jump comes with tracking a second frequency from the same satellite.  Cheap options here are still probably a few years away.

People should realize that small UAVs, especially rotary wing craft, are really tough environments for RTK so you are probably not going to be able to install this and have reliable cm accuracy without at least some integration work.  But at this price point hobbyists can experiment and that's a good thing.


Developer
Comment by Randy on March 18, 2015 at 5:30pm

Yes, RTK seems very hard to do.  For example many of us watched the Piksi RTK GPS come to life and it did become a product (for about $1000) and is supported for the Pixhawk but I hear it takes 20min to get a lock and I haven't seen many using it..

Comment by John Dennings on March 18, 2015 at 8:18pm

Would a pair of these  be able to do actual  carrier phase measurement correction? (Besides dual frequency correction). Via Uart?

Comment by Bertrand Duchiron on March 18, 2015 at 11:03pm

@John :

Well with the Edison and a M8N GPS chip (the same as the Navio+) I think the Reach could have good results, check this entry from Emlid with a RTK test with the older GPS model Neo-6T on the Navio

http://diydrones.com/profiles/blogs/navio-rtk-demonstration

On my side I  "play" with 2 of these https://sylphase.com/p/940136 on various platforms (BBB, Rpi , Odroid C1) with RTKlib. So far I get some good results using RTKLib.

Comment by John Bond on March 19, 2015 at 12:19am

Hey, I'm a fan of Reach.  I may buy a couple to play with and I'm not discouraging anyone from doing the same.  I've use single frequency RTK systems for more than two decades.  They work just fine within their limitations which are generally requiring several minutes to "fix" the carrier phase integers and to have continuous high quality raw data measurements from four plus satellites to maintain their high accuracy fix.

The second requirement is the problematic one for small UAVs because of all the electronic noise in a confined space.  It's much easier on manned aircraft because of the Inverse Squared Law.

Again, multiple GNSS help and IMU aided tracking will help (it's not implemented yet), but neither help as much as dual or triple frequency measurements can.

It will be interesting to see what Reach can do.  I'm sure some systems can be made to work fairly reliably, but in no way do I see it being "plug and play" for UAVs.  Of course I'd love to be wrong about this.  Again, at this price point, we are going to find out.

Comment by Mikhail Avkhimenia on March 19, 2015 at 3:27am

Hi, I'm a co-owner of Emlid, thanks for posting this.

@John Bond

Of course professional geodetic receivers are far ahead, but their pricing range is also far from can be called affordable. You're thinking in a right direction - our goal is to provide an affordable solution so that more people can work with RTK. On ranges that are used by drone pilots L1 is performing great (e.g. base station is installed on the field and pilot flies in range of 10-15km). We've been mostly flying planes with L1 RTK and it performed totally great, copters should be trickier, but with proper antenna placement to avoid interference it should also be all right.

@Randy

Reach locks as fast as a usual U-blox GNSS receiver and if the environment is good fixed solution will be provided in a couple of minutes.

@John Dennings

Yes, a pair of Reach modules is a complete RTK set. They can be interconnected over UART, WiFi, BT or even 3G/4G modem (that can be plugged in USB).

Comment by John Dennings on March 19, 2015 at 8:10pm

Mikhail, Bertrand,

Thanks for the info. What kind of precision to you guys actually get?  Are we talking reliable, sub decimeter?

If used on a  copter, what would be a reasonable expectation?

Comment by John Dennings on March 19, 2015 at 8:16pm

A related question ... I am interested in setting up an indoor testing lab inside a hangar (just one roof) with a GPS repeater, sort of poor man Vicon environment.  Wondering what sort of precision (horizontal only) and reliability I could expect with a pair or Reach and m8n?

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