Base station – a highly accurate GNSS receiver which is stationary and collects GNSS data to calculate correction messages from
NTRIP – Networked Transport of RTCM via Internet Protocol. A way of providing correction messages for rovers to use.
NTRIP caster – is the actual server which provides the NTRIP corrections to a user/rover
NTRIP provider – the organization which provides NTRIP correction services (free or paid)
NTRIP Modem – a standalone device, which typically consists of an cellular modem and an output to send RTCM corrections to a rover.
Mount point – an NTRIP provider may have several base stations providing corrections. A mount point is a base station (real of virtual) from which corrections can be requested
PPK – Post Processed Kinematics. While many applications require live high accuracy positioning, sometimes post processing can be used. With PPK a survey is performed by recording data. Afterwards, the corrections are applied to the recorded data enhancing the accuracy.
PPP – Precise Point Positioning. A form of RTK in which the correction messages are received from (geostationary) satellites. No base station is required.
RTCM – Radio Technical Commission for Maritime Services. An organization which standardizes communication in the maritime industry. In this context one could also say: Real Time Correction Message. With RTCM typically the correction message is meant.
RTK – Real Time Kinematics. In normal use RTK is used as a terminology to indicate cm-level accurate GNSS based positioning. In practice this means a setup which consists of a base station and a rover. The base station has a fixed position, and determines the corrections required. The rover is the actual measuring device, this applies the corrections to achieve high position accuracy.
Rover – a highly accurate GNSS receiver which can apply correction messages to achieve high accurate position output