Difference between revisions of "DGPS"

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* NEO-M8P-2: acting as the rover (mobile) or as the ground station
* NEO-M8P-2: acting as the rover (mobile) or as the ground station


The NEO-M8P-2 acting ground station should know its position. This can be done by locating the ground antenna to a know position and initializing the ublox to this position, or programming the ublox to send its estimate converging position after a given time and giver precision
The NEO-M8P-2 acting as the ground station must know its position. This can be done by locating the ground antenna to a know position and initializing the ublox to this position, or programming the ublox to send its estimated position after a given converging time and precision.
Furthermore the ublox acquire observation data and output them with its position to the NEO-M8P rover (mobile).


The as a ground station acquire observation data from its fixed position and output these data to the NEO-M8P rover (mobile).  
The ground station output three messages types of the RTCM3 standard to the rover (mobile):
* RTCM3.2 1005 : Ground station position
* RTCM3.2 1077 : GPS observation data
* RTCM3.2 1087 : Beidou observation data


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  
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
These data are transmitted as new messages within the paparazzi telemetry. The

Revision as of 10:37, 26 February 2017

The Differential GPS present here is based on the Ublox chip M8P. There are two types 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 the ground station must know its position. This can be done by locating the ground antenna to a know position and initializing the ublox to this position, or programming the ublox to send its estimated position after a given converging time and precision. Furthermore the ublox acquire observation data and output them with its position to the NEO-M8P rover (mobile).

The ground station output three messages types of the RTCM3 standard to the rover (mobile):

  • RTCM3.2 1005 : Ground station position
  • RTCM3.2 1077 : GPS observation data
  • RTCM3.2 1087 : Beidou observation data

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

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