GNSS Raw Data

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 data	Full raw data
GNSS raw data output	Code phase	Carrier phase
Supported UBX messages	UBX-RXM-SFRBX RXM-MEASX	UBX-RXM-SFRBX RXM-MEASX RXM-RAWX
RAW data elements	Satellite 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 M8	u-blox M9	u-blox F9	u-blox F10
Chips		UBX-M9140-KA-DR
Modules	LEA-M8T NEO-M8P NEO-M8T	NEO-M9L-01A	LEA-F9T NEO-F9P ZED-F9P ZED-F9R ZED-F9T	NEO-F10T
EVKs	C94-M8P EVK-M8T	EVK-M9DR	C099-F9P C102-F9R EVK-F9DR EVK-F9P EVK-F9T RCB-F9T	EVK-F10T