Jackson Labs RSR GNSS Transcoder, Руководство пользователя

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RSR GNSS Transcoder™ User Manual
76 © 2017 Jackson Labs Technologies, Inc.
The dynamic state is always set to STATIONARY if one of the Position Hold Auto Survey stationary
modes is selected using the command GPS:TMODE, as the Position Hold mode setting overrides any
dynamic state user setting.
Settings will be applied immediately to the uBlox GNSS receiver, and are stored in Non Volatile
memory. This command is only supported with an external uBlox GNSS receiver.
4.10.17 GPS:DYNAMic:STATe?
This query returns the actual state of the dynamic model, chosen by the firmware to be applied to the
external uBlox GNSS receiver depending on vehicle velocity. It returns a value between 0 and 7,
which correspond to one of the dynamic models defined in the Table in section
4.10.16 .
This state can be different from the user-selected Dynamic model mode for two reasons:
•
if the dynamic mode is set to 8 (Automatic mode), the state will reflect the dynamic model being
applied to the GNSS receiver depending on actual vehicle dynamics
•
if the GPS Timing Mode is set to ON or to RSTSURV, the dynamic state will always be set to 1
(Stationary)
This command is only supported with an externa uBlox GNSS receiver.
4.10.18 GPS:REFerence:ADELay <float> <s | ns >
[-32767ns,32767ns]
The ADELay command allows bi-directional shifting of the 1PPS output in relation to the UTC 1PPS
reference in one nanosecond steps. This allows antenna cable delay compensation, as well as
retarding or advancing the 1PPS pulse arbitrarily to calibrate different units to each other for
example. Typical antenna delays for a 30 foot antenna cable with 1.5ns per foot propagation delay
would be compensated with the following command:
GPS:REF:ADEL 45ns
This command can be used to fine-tune different units to have co-incident 1PPS pulse outputs. This
command is only supported with an external uBlox GNSS receiver.
4.10.19 GPS:REFerence:PULse:SAWtooth?
This command returns the momentary sawtooth correction factor that the GNSS receiver indicated.
This command is supported with both an externa uBlox GNSS receiver and a Rockwell Microgram
or RSR Puck loaded with custom JLT NMEA firmware.
4.10.20 GPS:RESET ONCE
Issues a reset to the internal GNSS receiver. This can be helpful when changing the antenna for
example, since the GNSS receiver measures the antenna system’s C/No right after reset, and adjusts
its internal antenna amplifier gains accordingly. It takes approximately 1 minute for GPS lock to