Vector Sensor Reference Manual 64
0 ON
1 OFF
The Vector Sensor will reply with the following response.
$>
6.3.4 $JALT
This command turns altitude aiding on or off for the Vector Sensor module. When set to on,
altitude aiding uses a fixed altitude instead of using one satellite’s observations to calculate the
altitude. The advantage of this feature, when operating in an application where a fixed altitude is
acceptable, is that the extra satellite’s observations can be used to betterment of the latitude,
longitude, and time offset calculations, resulting in improved accuracy and integrity. Marine
markets, for example, may be well suited for use of this feature, however, it’s not normally
required for Vector Sensor operation.
This command has the following layout.
$JALT,c,v[,GEOID] <CR><LF>
Where feature status variable, ‘c’, and threshold variable, ‘v’, may be one of the following.
c Description
NEVER This is the default mode of operation where
altitude aiding is not used.
SOMETIMES Setting this feature to SOMETIMES allows the
receiver to use altitude aiding, dependent
upon the PDOP threshold, specified by ‘v’
ALWAYS Setting this feature to ALWAYS allows the
receiver to use altitude aiding regardless of a
variable. In this case, you may specify the
ellipsoidal altitude, ‘v’ that the receiver should
use. Optionally, if you specify the ‘,GEOID’
field, the receiver will use the GEOID as its
reference.
The Vector Sensor will reply with the following response.
$>
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