Geodetic Grade GNSS

Geodetic Grade GNSS

Nowadays possible by using low cost hardware and ignoring the effort to get it up and running. My personal continously opereated reference station (CORS) is located onto the flat roof of my garage.
The position of the base station is determined using the real-time kinematic technique and the nearest reference station KARL00DEU0 (grade A!), which is located 28.280,859m away.
Although the view to the sky is limited, a simple ground plate is used and 20-kilometer baseline is usually considered the limit, sub-centimeter accuracies will be achieved during four hours of continuous operation:

 

 

Limitations
Receiver: Due to the fact, the receiver is of single-frequency nature, the precise point positioning (PPP) technique, which requires hours of continuous observation, correction data from external providers and many more is not effective.
Antenna: Due to the narrow frequency range of the antenna (1575.42 ± 1.023 MHz), GLONASS satellites will not be used.
Software: For RTK positioning selection of satellites was limited to GPS satellites.

Bill of materials (~200 €)
1x Trimble Bullet III (57861-00, 90 €)
1x UBlox NEO M8T Time & Raw Receiver Board (67 €)
1x TNC Antenna CFD 200 low loss Cable (2,5m; 19 €)
1x BananaPI M2Z (ubuntu, Kernel 5.3.0-rc8, 19 €)

Details – SNR vs. Elevation Plot (only yellow marked area is used)


Details – seven Hours Skyplot

 

Watch out the next article about verification of setup …