ZED-F9P - Integration manual
Message type
Message content
Source
9
Satellite navigation (ephemeris)
All
10
Degradation
Primary
12
Time offset
Primary
17
Satellite almanac
All
18
Ionosphere grid point assignment
Primary
24
Mixed fast / long term corrections
Primary
25
Long term corrections
Primary
26
Ionosphere delays
Primary
Table 14: Supported SBAS messages
Each satellite services a specific region and its correction signal is only useful within that region.
Planning is crucial to determine the best possible configuration, especially in areas where signals
from different SBAS systems can be received:
•
Example 1 - SBAS receiver in North America:
In the eastern parts of North America, make sure
that EGNOS satellites do not take preference over WAAS satellites. The satellite signals from
the EGNOS system should be disallowed by using the PRN mask.
•
Example 2 - SBAS receiver in Europe:
Some WAAS satellite signals can be received in the
western parts of Europe, therefore it is recommended that the satellites from all but the
EGNOS system should be disallowed using the PRN mask.
Although u-blox receivers try to select the best available SBAS correction data, it is
recommended to configure them to disallow using unwanted SBAS satellites.
To configure the SBAS functionalities use the CFG-SBAS-* configuration group.
Parameter
Description
CFG-SIGNAL-SBAS_ENA
Enabled/disabled status of the SBAS subsystem
CFG-SBAS-USE_TESTMODE
Allow/disallow SBAS usage from satellites in test mode
CFG-SBAS-USE_RANGING
Use the SBAS satellites for navigation (ranging)
CFG-SBAS-USE_DIFFCORR
Combined enable/disable switch for fast-, long-term and ionosphere corrections
CFG-SBAS-USE_INTEGRITY
Apply integrity information data
CFG-SBAS-PRNSCANMASK
Allows selectively enabling/disabling SBAS satellites
Table 15: SBAS configuration parameters
SBAS is only used if no RTCM correction services are available. If the connection stream is
lost during the operation, the receiver will switch to use the SBAS corrections after the time
set in CFG-NAVSPG-CONSTR_DGNSSTO (60 s by default) has elapsed.
When the receiver switches from an RTK to a standard position solution, the reference frame of the
output position will switch from that of the RTK corrections to that of the standard position solution.
For an SBAS solution this reference frame will be aligned within a few cm of WGS84 (and modern
ITRF realizations).
3.3 QZSS SLAS
QZSS SLAS (Sub-meter Level Augmentation Service) is an augmentation technology, which
provides correction data for pseudoranges of GPS, QZSS, and other major GNSS satellites. The
correction stream is transmitted on the L1S signal at the L1 frequency (1575.42 MHz).
For more information on QZSS SLAS, visit the web site
UBX-18010802 - R08
3 Receiver functionality
Page 28 of 110
Early production information
