So the product page says ~30cm accuracy as rover and 1.4cm accuracy with RTK fix. How is the RTF fix accomplished? Is it as simple as connecting to my cell phone via BT?
“When the device is in Rover mode and RTCM correction data is sent over Bluetooth® or into the radio port, the device will automatically enter Positioning with RTK mode. In this mode RTK Facet will receive L1/L2 signals from the antenna and correction data from a base station. The receiver will quickly (within a second) obtain RTK float, then fix. The NMEA sentences will have increased accuracy of 14mm horizontal and 10mm vertical accuracy. The RTCM correction data is most easily obtained over the Internet using a free app on your phone (see SW Maps or Lefebure NTRIP) and sent over Bluetooth® to the RTK Facet but RTCM can also be delivered over an external cellular or radio link to a 2nd RTK Facet setup as a base station.“
In general, yes RTK is easy. But it’s all what you pay for. If you want free, there are hoops to jump through. If you want to pay for PointPerfect RTCM/NTRIP (~$15/month) it’s typing some difficult user/pw credentials into a cellphone. These docs may help shed some light.
Welcome @wamcdonald ,
Assuming you are in the USA, what State will you be operating in ?
Sweet…thank you. Noob going to survey my 2 acre property in ID because I wanted a tropo view for the architect. Also, will use in the future as a base for home RTK fun.
in the Nampa area of idaho
Slightly off topic but does anyone know what the average bandwith a DIY GNSS reference station uses? Thinking about putting one up on the north east side of Denver, it’s about 20km from the next closest one. I’m in a internet hole where we only have 10mbps DSL and I don’t want to over work that.
Welcome! We’ve got way too many GNSS nerds here (shouldn’t we be working?).
A base is a fine idea but I don’t recommend Facets for permanent installs (it’s not waterproof). I’ve got an RTK Surveyor at my cabin that’s been working as a based for 2+ years with very minimal down time. It, or the facet RTK mosaic-X5 make good base stations.
The Facet in ID using most any correction service should work fine. Depends on the service’s coverage map but I suspect PointPerfect’s SSR service will work just fine there. But if you want to take the plunge and setup your own base, then you’ll be all set.
@YellowDog - Depends on the receiver, RTCM type enabled, and sats in view. Last time I looked, ZED-F9P with L1+L2 (no L5) was around 530 bytes per second, but varied +/- 100 bytes (again, rough recollection). The mosaic-X5 can produce a lot more, looks like we’re pushing ~2310 bytes per second to RTK2Go and Emlid from the SparkFun HQ base. The 3.73kb/s is Onocoy which has some additional knobs turned on.
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Thank you @sparky , that sounds like a manageable amount of data for my junk ISP connection.
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