Jackson Labs RSR GNSS Transcoder, Руководство пользователя

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RSR GNSS Transcoder™ User Manual
occur after a GNSS receiver reset. The externally-connected GNSS reciever is alternatively
re-configured to power-on dfault specifications when issuing this command.
4.10.21 GPS:TMODe <ON | OFF | RSTSURV>
This command selects the Timing Mode of an external timing-enabled uBlox GNSS receiver.
If the Timing Mode is OFF, the receiver will act as a regular GNSS receiver in 3D mobile mode. This
mode has to be chosen if the unit is used with a moving antenna.
If the Timing Mode in ON, the timing features of the GNSS receiver are enabled. At power-up, the
Hold position stored in NVRAM will be sent to the GNSS receiver and will be used as the reference.
In order to use this mode, the receiver position must be known as exactly as possible. Errors in the
Hold position will translate into time errors depending on the satellite constellation.
The Hold position can be set manually by the user or can be the result of a position Auto Survey
executed by the uBlox GNSS receiver.
If the Timing Mode is set to RSTSURV, the uBlox GNSS receiver will start an Auto Survey every
time the unit is powered-on and following the Survey sequence, the uBlox GNSS receiver will run
with the timing features enabled. Once in Position Hold mode, the antenna location should be held
completely stationary. This command is only supported with an external Timing uBlox GNSS
receiver.
4.10.22 GPS:SURVey ONCE
This command starts an Auto Survey. At the end of the Survey, the calculated Hold position will be
stored in NVRAM. The Survey parameters can be set with the command
GPS:SURVey:DURation
and GPS:SURVey:VARiance. This command is only supported with an external Timing uBlox
GNSS receiver.
4.10.23 GPS:SURVey:DURation <sec>
This command sets the Survey minimal duration. It is only supported with an external Timing uBlox
GNSS receiver.
4.10.24 GPS:SURVey:VARiance <mm
2
>
This command specifies the minimum variance of the average position computed during the Survey.
This minimum value is used as a threshold under which the uBlox GNSS receiver can stop the
Survey. The GNSS receiver will stop the Survey when the minimal duration has been reached and the
variance of the average position is under the specified minimum variance. This command is only
supported with an external Timing uBlox GNSS receiver.
4.10.25 GPS:HOLD:POSition <cm, cm, cm>
This command allows the user to manually specify the exact position of the antenna. This command
will overwrite the Hold position in NVRAM. A subsequent Auto Survey will overwrite this Hold