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190-00228-08 GPS 16x Technical Specifications Rev. B
Page 18
4.2.14 3D Velocity Information (PGRMV)
$PGRMV,<1>,<2>,<3>*hh<CR><LF>
<1> True east velocity, -514.4 to 514.4 meters/second
<2> True north velocity, -514.4 to 514.4 meters/second
<3> Up velocity, -999.9 to 999.9 meters/second
4.2.15 DGPS Beacon Information (PGRMB)
Note: PGRMB is not supported at this time.
$PGRMB,<1>,<2>,<3>,<4>,<5>,K,<6>,<7>*hh<CR><LF>
<1> No Effect (This field is not used on this model and is included only for backwards compatibility)
<2> No Effect (This field is not used on this model and is included only for backwards compatibility)
<3> No Effect (This field is not used on this model and is included only for backwards compatibility)
<4> No Effect (This field is not used on this model and is included only for backwards compatibility)
<5> Distance to beacon reference station in kilometers
<6> No Effect (This field is not used on this model and is included only for backwards compatibility)
<7> DGPS fix source (R = RTCM, W = WAAS, N = Non-DGPS Fix)
<8> DGPS mode, A = Automatic, W = WAAS Only, R = RTCM Only, N = None (DGPS disabled)
4.3 BAUD RATE SELECTION
Baud rate selection can be performed by sending the appropriate configuration sentence to the GPS sensor as
described in the $PGRMC
section 4.1.3 Sensor Configuration Information (PGRMC), field <10>.
4.4 ONE-PULSE-PER-SECOND (PPS) OUTPUT
The highly accurate one-pulse-per-second (PPS) output is provided for applications requiring precise timing
measurements. The signal is generated after the initial position fix has been calculated and continues until the unit is
powered down. The rising edge of the signal is synchronized to the start of each GPS second. Regardless of the
selected baud rate, the information transmitted by the GPS sensor is referenced to the pulse immediately preceding
the NMEA 0183 RMC sentence.
The accuracy of the one-pulse-per-second output is maintained only while the GPS sensor can compute a valid
position fix. To obtain the most accurate results, the one-pulse-per-second output should be calibrated against a local
time reference to compensate for cable and internal receiver delays and the local time bias.
The default pulse width is 100 ms, however; it may be programmed in 20 ms increments between 20 ms and 980 ms
as described in $PGRMC
section 4.1.3 Sensor Configuration Information (PGRMC), field <13>.
4.5 RECEIVED RTCM DATA
Position accuracy of less than 5 meters can be achieved with the GPS 16x series products by using Differential GPS
(DGPS) real-time pseudo-range correction data in RTCM SC-104 format, with message types 1, 2, 3, 7, and 9.
These corrections can be received by the GPS 16x series products on COM2. The RTCM data must be received at
the same baud rate as the COM1 port. For details on the SC-104 format, refer to RTCM Paper 134-89/SC 104-68 by
the Radio Technical Commission for Maritime Services.