Seatex AIS 100 Instruction Manual, rev. 5
External interfaces
75
P = Precise. Satellite system used in precision mode. Precision mode
is defined as: no deliberate degradation (such as Selective
Availability), and higher resolution code (P-code) is used to compute
position fix.
R = Real Time Kinematic. Satellite system used in RTK mode with
fixed integers.
F = Float RTK. Satellite system used in real time kinematic mode with
floating integers.
E = Estimated (dead reckoning) Mode.
M = Manual Input Mode.
S = Simulator Mode.
The Mode indicator shall not be a null field.
NOTE 2
Age of differential data and Differential reference station ID
a)
When the talker is GN and more than one of the satellite systems
are used in differential mode, then the "Age of differential data"
and "Differential reference station ID" fields shall be null. In this
case, the "Age of differential data" and "Differential reference
station ID" fields shall be provided in following GNS messages
with talker IDs of GP,GL, etc. These following GNS messages
shall have the latitude, N/S, longitude, E/W, altitude, geoidal
separation, mode and HDOP fields null. This indicates to the
listener that the field is supporting a previous $GNGNS message
with the same time tag. The "Number of satellites" field may be
used in these following messages to denote the number of
satellites used from that satellite system.
Example:
A combined GPS/GLONASS receiver using only GPS differential
corrections has the following GNS sentence sent:
$GNGNS,122310.2,3722.425671,N,12258.856215,W,DA,14,0.9,1005
.543,6.5,5.2,23*59<CR><LF>
Example:
A combined GPS/GLONASS receiver using both GPS differential
corrections and GLONASS differential corrections may have the
following three GNS sentences sent in a group:
$GNGNS,122310.2,3722.425671,N,12258.856215,W,DD,14,0.9,1005
.543,6.5,,*74<CR><LF>
$GPGNS,122310.2, , , , , , 7, , , ,5.2,23*4D<CR><LF>
$GLGNS,122310.2, , , , , , 7, , , ,3.0,23*55<CR><LF>
The Differential Reference station ID may be the same or different for
the different satellite systems
b) Age of Differential Data
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