The receiver will reply with the following response.
$>
3.4 $JALT
This command turns altitude aiding on or off for the receiver. 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 receiver 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. ‘v’ is ignored in this
case.
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’ (in meters) that the
receiver should use. Optionally, if you specify
the ‘,GEOID’ field, the receiver will use the
GEOID as its reference.
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