Precision agriculture needs centimetric guidance.
GNSS is particularly well-suited to this task, as crop sites are free of mask and GNSS reception quality is excellent.
To obtain centimetric precision, the best method is to use RTK mode with a sufficiently close base.
The rover is located on a tractor, for example, and the base is often at farm level.
Accuracy is of the order of 1 cm + 1 PPM
1 PPM for Part Per Million means that inaccuracy increases by 1 cm if the rover is 1 million centimeters away from the base.
1,000,000 cm = 10 km
Distance rover-base = 10 km -> accuracy of the order of 2 cm
Distance rover-base = 20 km -> accuracy of the order of 3 cm
Distance rover-base = 30 km -> accuracy of the order of 4 cm
Distance rover-base = 40 km -> accuracy of the order of 5 cm
It is advisable not to exceed 40 km to guarantee correct results, especially if the altitude differs greatly between the base and the rover due to the difference in troposphere crossed by the GNSS signals.
Geobsys offers a range of solutions based on different communication layers:
- LoRa layer: enables the creation of a local network with a range of up to 20 km in very open areas. Use of this communication protocol is free of charge. It is necessary to install the GEOSTIX with the LoRa layer high up to increase the range.
- LTE layer: this eliminates range problems, provided that LTE, 3G or 2G coverage is available. SIM cards and subscriptions are required for the base station and rover(s).