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 qzss.go.jp/en/.
UBX-18010802 - R08
3 Receiver functionality Page 28 of 110
Early production information
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