Technology

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25 Mar 2025

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:

 

Chips

Modules

EVKs

u-blox M8 NEO-M8PC94-M8P
     NEO-M8T
     LEA-M8T
EVK-M8T
u-blox M9UBX-M9140-KA-DRNEO-M9L-01AEVK-M9DR
u-blox M10UBX-M10050-KB-RWMIA-M10Q-01BEVK-M101
u-blox F9 NEO-F9P
ZED-F9P
EVK-F9P
C099-F9P
     ZED-F9RC102-F9R
EVK-F9DR
     ZED-F9T
     LEA-F9T
EVK-F9T
RCB-F9T
u-blox F10UBX-F10050-KB-RWNEO-F10N-00B-20EVK-F10N
     NEO-F10TEVK-F10T
u-blox X20 ZED-X20PEVK-X20P

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