3 Command Line Reference
ssbc
gsbc
setSBASCorrections
getSBASCorrections
Satellite
SISMode
NavMode
DO229Version
auto
EGNOS
WAAS
MSAS
GAGAN
SDCM
S120 ... S158
Test
Operational
EnRoute
PrecApp
MixedSystems
auto
DO229C
RxControl: Navigation > Positioning Mode > SBAS Corrections
Use these commands to define/inquire the details on the usage of SBAS data in the PVT
computation. This command does not define whether SBAS corrections are to be used or not
in the PVT (this is done by the
command), but it specifies how these corrections
should be used.
The
Satellite
argument defines the provider of SBAS corrections, being either an individual
satellite or a satellite system. If
EGNOS
,
WAAS
,
MSAS
,
GAGAN
or
SDCM
is selected, the receiver
restricts the automatic selection of a satellite to those that are part of the EGNOS, WAAS,
MSAS, GAGAN or SDCM system. When
auto
is selected for the
Satellite
argument, the receiver
will automatically select a satellite on the basis of the location of the receiver and on the
availability of SBAS corrections.
The
SISMode
argument defines the interpretation of a "Do Not Use for Safety Applications"
message. It depends on the SBAS service selection with the
command.
For the DO229 service: When set to
Operational
, the receiver will discard all SBAS correc-
tions received from a satellite upon reception of a MT00 from that satellite. Note that MT02
content encoded in a MT00 message will be interpreted by the receiver as a MT02 message:
only MT00 with all ’0’ symbols will be interpreted as a true "Do Not Use for Safety Applica-
tions". When the argument
SISMode
is set to
Test
, the receiver will ignore the reception of
a "Do Not Use for Safety Applications" message. This provides the possibility to use a signal
from a SBAS system in test mode.
For the DFMC service: When set to
Operational
, the receiver will discard all SBAS cor-
rections received from a satellite upon reception of a MT00 from that satellite. When the
argument
SISMode
is set to
Test
, the receiver will ignore the reception of a "Do Not Use for
Safety Applications" message. This provides the possibility to use a signal from a SBAS sys-
tem in test mode. In this case the MT00 message content will be interpreted by the receiver
as integrity data (MT34, MT35 or MT36).
The SBAS standards, which have their origin in aviation, make a distinction between two posi-
tioning applications: en-route and precision approach. The choice between both applications
influences the length of the interval during which the SBAS corrections are valid. During a
precision approach the validity of the data is much shorter. The receiver can operate in both
modes, which is controlled by the
NavMode
argument.
In
EnRoute
or in
PrecApp
mode, the receiver only uses the satellite systems for which SBAS
corrections are available. For best positioning accuracy, it is typically preferable to include all
satellites in the position computation, even if they are not corrected by SBAS. This is achieved
by the
MixedSystems
mode.
The
DO229Version
argument can be used to specify which version of the DO 229 standard to
conform to.
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