The Reach M+ is a compact and affordable multi-GNSS RTK receiver with built-in IMU for precise navigation and UAV mapping without GCPs. It can provide coordinates down to centimetre accuracy in RTK mode. RTK mode requires a pair of receivers: one stationary which provides corrections, and another one moving which applies corrections and provides precise coordinates.
Centimetre Accuracy with the Reach M+
The Emlid Reach M+ needs access to corrections for centimetre accuracy. Obtained over the Internet (NTRIP) or a local Reach RS+ base station can be used.
NTRIP (Networked Transport of RTCM via Internet Protocol) allows a RTK GNSS receiver (client) to communicate with a base station (caster) over the internet to achieve cm level accuracy.
A base station is a unit set to a known latitude, longitude and height. This is referred to as a ‘known’ point. This base will keep monitoring the satellites above and will calculate position corrections and send them to the Rover.
An Emlid Reach RS+ is suitable for use as a base station. They are capable of transmitting corrections locally or over the internet. If set up locally, all recorded positions will be relative to the position of the Base Station.
Whether using NTRIP or a RS+ sending corrections over the internet. It is important to note the baseline. The baseline is the term given to the distance between the base station and the GNSS Receiver (Reach M+). The baseline is important, because the atmospheric conditions will be different at different locations. Therefore, there will be less accuracy the further the rover gets from the base.