u-blox

Technology

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19 May 2022

GNSS Raw Data

The so called GNSS raw data is generated by the tracking engine and includes measurements for each tracked satellite.

Telecommunication satellite flying over the Earth

What is GNSS raw data?

The so called GNSS raw data is generated by the tracking engine and includes measurements for each tracked satellite. It is a copy of the measurements that the receiver’s main navigation task uses internally.

GNSS raw data levels

u-blox has defined two different raw data level as shown in the table below.

 Basic raw dataFull raw data
GNSS raw data outputCode phaseCarrier phase
Supported UBX messagesUBX-RXM-SFRBX
RXM-MEASX		UBX-RXM-SFRBX
RXM-MEASX
RXM-RAWX
RAW data elementsSatellite Information
Code Phase [ms]
Doppler [m/s, Hz]		Satellite Information
Code Phase [ms]
Doppler [m/s, Hz]
Pseudoranges [m]
Carrier phase [cycles]

Typical application examples

  • Data recording for post-processed kinematic (PPK) calculations
  • A secondary output for additional external sensors fusion
  • A secondary output for cloud map generation or update

Available products

Basic raw data is available on all GNSS receivers based on u-blox M8 and later platforms.
Full raw data is only available on specific GNSS receivers as shown in the table below:

 u-blox M8u-blox M9u-blox F9
ModulesNEO-M8P
NEO-M8T
LEA-M8T

NEO-M9L-01A

ZED-F9P
ZED-F9R
ZED-F9T
LEA-F9T
EVKsC94-M8P
EVK-M8T		EVK-M9DR

C099-F9P
C102-F9R
RCB-F9T
EVK-F9T