General

Applicable receivers:  All receivers

Use this page to set the general receiver settings.

Select Receiver Configuration / General.

 

Operation Mode – Choose between Base, Moving base, Heading, and Rover modes.

  • Base – Provides base station functionality. The Motion is set to Static.

  • 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.

  • 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.

  • 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™ – (BD9250, BD940, BD990, BD992 only) Use of the IonoGuard feature during ionospheric disturbances has been proven to maintain the precision and reliability of the RTK and RTX position solution. The IonoGuard feature reduces the effects of ionosphere and scintillation on the signals.

Optimum performance is achieved when IonoGuard™ technology is enabled at both the base and rover receivers:

  • With IonoGuard enabled at the base station, ionospheric information for each satellite is transmitted via CMRx/sCMRx or RTCM MSM protocols to rover receivers. IonoGuard rover receivers use this information together with their own ionospheric measurements to optimize the computed positions

  • If IonoGuard is not enabled at the base receiver, then an IonoGuard rover receiver can operate in Fallback mode. The receiver analyzes the standard base messages and determines if ionospheric adjustments are necessary. These adjustments are used to improve positioning performance. This method is not as rigorous as having the more detailed ionospheric information sent from the base station, but can assist when using a non-Trimble ProPoint receiver or a third-party base receiver. There may be negative impacts in positioning performance when Ionospheric disturbances are not present. Trimble recommends that you do not use Fallback mode unless there is the possibility of ionospheric disturbances in your area.

  • For best results, Trimble ProPoint firmware 6.24 or later is required on the base receiver and rover receiver with IonoGuard enabled on both receivers.

IonoGuard has the following modes:

  • Base mode – 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.

  • Fallback Mode – The base station does not have IonoGuard enabled. Ionospheric disturbance detection at the rover receiver runs when the data received from the base station does not include IonoGuard messages.

On the Satellites - Tracking Information page, an icon shows the level of ionosphere disturbance.

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.