What is NTRIP? How is it used for RTK?
When it comes to the base, there are three main options. A user can choose to use their own, local base which is located somewhere within the vacinity of where they are conducting their survey. An alternative to this is to access one remotely using technology called NTRIP.
What is NTRIP?
Originally developed by the German Federal Agency for Cartography and Geodesy in 2004. NTRIP or the Networked Transport of RTCM via Internet Protocol allows a GPS / GNSS rover to receive corrections over the internet without the need for a local base.
NTRIP consists of three parts:
1. The Base, in Emlid’s case this is a customer’s Reach RS+ or Reach RS2 set as a Base situated in a fixed, known, location.
2. The Caster, in Emlid’s case, they offer a free caster which allows a user to relay corrections from their own base to the rover.
3. The Rover, in Emlids case this could be a second Reach RS+ or Reach RS2 set as a Rover.
When carrying out a survey the rover received all the corrections in real time via the internet*.
How to Connect to NTRIP
Alternatively, Emlid offer their own NTRIP caster. Designed with a user friendly interface, which allows for very easy setup.
The Advantages and Disadvantages of using NTRIP
NTRIP can be very useful for working in RTK. It does however, have its advantages and disadvantages.
High absolute accuracy. With corrections from NTRIP, you obtain high accuracy in your data.
No need for a local base. You can work with just a rover and still perform an accurate survey.
Fast fix. Internet connection to NTRIP helps you find the fix solution faster.
Fees. Some NTRIP networks are private, therefore a user will need to pay for using them. These costs can be pretty prohibitive.
NTRIP is dependent on the Internet. It therefore only works where there is cellular network coverage. NTRIP is unavailable where there is no cellular / internet access.