General
Applicable receivers: All receivers
Use this page to set the general receiver settings.
Select Receiver Configuration / General.
Operation Mode –
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Base – Provides base station functionality. The Motion is set to Static.
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Moving Base – Provides Moving Base functionality. The Motion is set to Kinematic and a CMR output is configured on Serial 3. To reconfigure this, select I/O Configuration / Port Configuration. The RTK Mode is set to Low Latency to allow for the use of static CMR or RTCM corrections. However, you can change it to Synchronous if you use Moving Base CMR corrections from another Moving Base receiver.
NOTE – The internal radio does not support transport of Moving Base CMR corrections.
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Heading – Provides Heading functionality. Requires CMR input from a Moving Base receiver. The Motion is set to Kinematic and the RTK Mode is set to Synchronous. If CMR corrections are available from a Moving Base receiver, the Heading (True North) is displayed on the receiver front panel.
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Rover – Provides rover functionality. The Motion is set to Kinematic.
Autobase – Enable with Warning or disable the AutoBase function of the receiver.
Shared Devices – Some receivers may include additional settings such as the Multiplexed port control on the BD9250 receiver module. See Multiplexed port control commands.
Select Port Function – On the BD990, BD992, and BD992-INS receiver modules sets the shared port on the receiver to be an additional serial port, a CAN bus, or a second event marker.
CAN – On the BD940 receiver module this enables the CAN bus. Enabling the CAN bus will disable the ability to set flow control on COM2
External Frequency – Select if an external 10 MHz frequency source is used if detected by the receiver.
1PPS On/Off – Enable or disable the 1PPS (one pulse-per-second) output regardless of whether or not the clock has been set, and to continue to output even after the clock is believed to have degraded.
CAUTION – Setting 1PPS may yield inaccurate results when the receiver is not tracking enough satellites to set time or maintain a highly accurate time solution.
Adjust Width – Select this check box to set the 1PPS pulse width. The range is from 160 ns to 10485600 ns. The default pulse width is 8,000 ns.
Always On – Output the 1PPS pulse even if there are no satellites received and there is no GPS time.
Event 1 On/Off – Enable or disable the first event marker function of the receiver.
Slope – Sets the first event marker to have a Positive (rising) slope or Negative (falling) slope.
Event 2 On/Off – Enable or disable the second event marker function of the receiver.
Slope – Sets the second event marker to have a Positive (rising) slope or Negative (falling) slope.
IonoGuard™
The following modes are available:
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Disabled – The receiver will not perform any IonoGuard processing.
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Enabled without Fallback Mode – [Default] If the base station has IonoGuard enabled, ionospheric disturbance detection runs at the base, and the disturbance information is sent to the rover receiver via RTCM/CMRx messages. If the base station does not have IonoGuard enabled, then IonoGuard is disabled at the rover.
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Enabled with Fallback Mode – If the base station does not have IonoGuard enabled, the rover will perform ionospheric disturbance detection when the data received from the base station does not include IonoGuard messages.
Fallback mode allows the rover to calculate IonoGuard positions without receiving IonoGuard messages from the base. With Enable without Fallback mode, IonoGuard positions are only calculated if the base is transmitting IonoGuard messages. To prevent spikes in the radio throughput due to IonoGuard messaging, messages are transmitted over several epochs to smooth the bandwidth usage.
On the Satellites - Tracking Information page, an icon shows the level of ionosphere disturbance that the RTK base station is experiencing on each satellite.
The Position page shows if IonoGuard is enabled or disabled.
For information, see Trimble IonoGuard: protecting RTK GNSS from ionospheric disturbances and How Trimble IonoGuard Secures GNSS Precision Amid Rising Solar Activity on trimble.com.
NOTE – From version 6.40:
IonoGuard. The IonoGuard feature has been enhanced when using the RTK single-baseline technique. When IonoGuard is enabled and is used under nominal conditions, improvements have been made to reduce degradations in position quality. This results in significant rover positioning improvements in situations where the base station is affected by multipath. Minor improvements have also been made to gradient estimation.
VRS. Enhancements have been made to the scaling of ionospheric gradient data to improve rover performance during periods of high ionospheric activity.
NMA Control – Enable RTX NMA (Navigation Message Authentication) and Enable OSNMA. Used together, these technologies mitigate spoofing attacks across the GPS, BeiDou, and Galileo satellite constellations.
Trimble ProPoint RTX-NMA provides broadcast ephemeris authentication via the Trimble RTX correction stream in real-time with support for GPS and BeiDou-3 satellites. A Trimble RTX subscription is not required. ProPoint RTX-NMA complements Galileo OSNMA. To enable ProPoint RTX-NMA, select RTX/xFill in the MSS / Configuration page.
Galileo tracking must be enabled to mitigate Galileo spoofing threats. Turn on Galileo in the Satellites / Enable/Disable page.
The NMA status of individual satellites can be viewed in the Satellite Tracking table.
NOTE – The receiver must be tracking an Trimble RTX NMA satellite for it to mitigate against GPS and BeiDou spoofing threats. Galileo tracking must be enabled to mitigate Galileo spoofing threats. In the receiver and in the Trimble Access software, Trimble xFill must be on for RTX NMA to work.
