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Brisbane Australia | Jason,
Your feedback on the Iowa RTN and your use is a very comprehensive and detailed post. It's great to hear you are happy enough with how your current setup is working on the Iowa RTN.
When considering a more reliable system in the future, I can highlight a few features designed into the mojoRTK which could benefit your above concerns:
The mojoRTK has it's own internal cell modem, as such if their is any break in the cell link our software will instantly and automatically start a reconnect. We can also use this internal cell modem when requested for Virtual Wrench access to assist quickly with any issues you have with any settings inside the mojoRTK system. Over Virtual Wrench our support team can also remotely see your screen operate the console and talk through any questions you have.
The mojoRTK has an external Cellular Antenna mounted on the roof and an optional Cellular booster is also available for low cellular signal strength areas if needed.
If RTK is lost the mojoRTK can automatically continue on L1L2 Glide algorithms with a high pass-to-pass accuracy (the user is notified) and then when the RTK accuracy is available again the system can automatically switch back to RTK (or notify the user if their is a difference before any action is taken)
The mojoRTK also supports a more advanced "MAX" Network RTK standard which will offer a higher availability due to the ability for the rover to use multiple common sets of satellites between itself and any nearby base/bases at the same time. ie the rover and a network base/bases to your west may just see a satellite setting in the west sky this can be used for RTK even when the satellite can no longer be seen by the network base/bases to your east. Likewise your rover and a Network base/bases to the east who see a rising satellite in the east sky can RTK before it is seen by the network base/bases to your west. This is how the "MAX" Network RTK mode improves availability times further.
GLONASS support on Iowa RTN and optionally on the mojoRTK also further improves availability if required for your area, currently GLONASS offers another 19 active satellites.
The mojoRTK can also output it's GPS position via NMEA on a serial port for other controllers in your setup. Various types of NMEA accuracy outputs are optionally possible including a fully Terrain compensated GPS + GLONASS NMEA output.
Leica Geosystems has a free tool available to predict the exact times when the GPS only satellites don't have good enough orbit locations above your position. http://www.leica-geosystems.com/us/en/lgs_65879.htm?cid=7574
download the tool and latest almanac, then follow the Readme_SatalliteAvailability.txt file
The advantage with using a Network RTK solution with it's fixed surveyed bases is if you do have any times of low GPS only satellite availability (short times depending on your location (latitude), type of solution and system setup) then when you come out of this time and the RTK solution returns you will be right back on your lines quickly.
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Planting on Iowa CORS
