ZED-F9H - Integration manual
Parameter
Description
CFG-SBAS-PRNSCANMASK
Allows selectively enabling/disabling SBAS satellites
Table 11: 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 SBAS integrity data are applied, the navigation engine stops using all signals for
which no integrity data are available (including all non-GPS signals). It is not recommended
to enable SBAS integrity on borders of SBAS service regions in order not to inadvertently
restrict the number of available signals.
SBAS integrity information is required for at least 5 GPS satellites. If this condition is not
met, SBAS integrity data will not be applied.
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
Supported from firmware version HDG 1.13 onwards
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 SLAS 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 SLAS corrections after
the time set in CFG-NAVSPG-CONSTR_DGNSSTO (60 s by default) has elapsed.
3.3.1 Features
Multiple QZSS SLAS signals can be received simultaneously.
When receiving QZSS SLAS correction data, the ZED-F9H high precision receiver will autonomously
select the best QZSS satellite. The selection strategy is determined by the quality of the QZSS L1S
signals, the receiver configuration (test mode allowed or not), and the location of the receiver with
respect to the QZSS SLAS coverage area. When outside of this coverage area, the receiver will likely
fall back to using SBAS corrections.
If QZSS SLAS corrections are used in the navigation solution, the differential status will be indicated
in several output messages such as UBX-NAV-PVT, UBX-NAV-STATUS, UBX-NAV-SAT, NMEA-
GGA, NMEA-GLL, NMEA-RMC and NMEA-GNS (see the applicable interface description [
]). The
message UBX-NAV-SLAS provides detailed information about which corrections are available and
applied.
Message type
Message content
0
Test mode
47
Monitoring station information
48
PRN mask
49
Data issue number
50
DGPS correction
UBX-19030120 - R04
3 Receiver functionality
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