DGPS

THe Differential GPS present here is based on the Ublox chip M8P. There are two type of Ublox M8P: - NEO-M8P-0: acting as the rover (mobile) - NEO-M8P-2: acting as the rover (mobile) or as the ground station

The NEO-M8P-2 acting as a ground station acquire observation data from its fixed position and output these data to the NEO-M8P rover (mobile). The ground station can be initialized with a know position, or programed to converge within a given time and precision. This way the ground station transmits also its position. The DGPS use three messages typed from RTCM3 standard protocol: - RTCM3.2 1005 : Ground station position - RTCM3.2 1077 : GPS observation data - RTCM3.2 1087 : Beidou observation data

as well as its position. The ground station The NEO-M8P acting as a rover (mobile) computes the position of the ground station acquire observation data from its mobile position and These data are transmitted as new messages within the paparazzi telemetry. The