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Belrobotics Parcmow Big Mow - BM1050 Manual

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Chapter 4 About RTK GPS
4 About RTK GPS
Standard GPS positioning data retrieved from satellites using GNSS (Global Navigation
Satellite System) is accurate to between 5m and 10m. This is because the signal received
from a satellite is distorted due to atmospheric and environmental conditions. Higher precision
positioning can be achieved by using an RTK (Real-Time Kinematic) technique.
This technique involves the use of an RTK base placed in a fixed position, which receives
GNSS signals from satellites. Since the base is fixed, the data it receives relates to its precise
location.
The robots are fitted with antennas, which also receive GNSS signals from satellites to
determine their position. Both the RTK base and the robots receive the GNSS signals from
satellites in different constellations (GPS, GLONASS, Galileo, BeiDou). Since the robots are
moving however, the evaluation of their position is less precise.
The RTK base computes correctional data for each of the satellites and sends these to the
robot. The robot is then able to use these corrections to achieve a positional accuracy of
between 2cm and 3cm. With such accurate positioning, the robot is able to follow a defined
pattern and cover the field in a series of straight lines.
Communication between the robot and the RTK base using WiFi and can be made over a
distance of up to 200m if there are no obstacles in the way. If greater distances are required,
up to 2 WiFi repeaters can be used.
Figure 2: Transfer of corrections using WiFi
Corrections can also be made via the Belrobotics cloud using 4G. In this case, obstacles do
not impede the transfer of correctional data and the base can connect to an unlimited number
robots at distances of up to 15km.
10 Big mow BM 1050 User's Manual Version: Release 4.5.0 Last updated: 2022-08-20
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