General

Use this page to set the general receiver settings.

Select Receiver Configuration / General.

 

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

    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.

  • Radio – Provides radio functionality.

Autobase – AutoBase will only enable CMRx correction output, but this can be manually changed to CMR+ and will be saved to the AutoBase application file. See Setting up a base station using AutoBase technology.

  • Disable – When a receiver is turned on, it automatically installs the CURRENT application file and starts running, applying all previous settings.

  • Enable with Warning – After the receiver has a stable position, it uses that position to search for a base position in the stored application files in the receiver. If there is no base position within the AutoBase search distance (20 m 2D) of the current position in any of the stored application files, then a AUTOBASE FAILED warning appears on the modular receivers that have the 2-line display so you can intervene and fix the problem. The receiver continues to use the CURRENT application file, until you update the configuration or set up a new reference base setting. If corrections are turned ON in the previously mentioned CURRENT application file, the receiver continues sending corrections with the previous base position in the CURRENT application file. If the CURRENT application file does not have any corrections set up, then there will not be any transmissions. See AutoBase with Warning (SPS Modular).

  • Enable without Warning – After the receiver has a stable position, it uses that position to search for a base position in the stored application files. If there is no base position within the AutoBase search distance (20 m 2D) of the current position in any of the stored application files, the receiver automatically uses the current HERE position as the base position, renaming the station name to AUTO000X, saving this information to the newly named application file, AUTO000X, and then starts transmitting the correction message from this new base position. This new configuration is saved to the CURRENT application file.

  • Enable – HERE position always – After the receiver has a stable position; it automatically uses the current HERE position as the base position, renaming the station name to AUTO000X (X is from 0 to 9 and if there are already ten saved AutoBase files, the oldest one is replaced). This information is saved in a new Application file, AUTO000X. The receiver starts transmitting correction message from this new base position. This new configuration is saved to the CURRENT Application file. In this method the receiver never searches for a base position in the stored Application files. It always uses the current HERE position as the base position.

For SPS GNSS systems with a two-line display, the Mode Settings / System Setup / AutoBase menu enables you to select one of the above settings. There is now no separate Autobase Warning display.

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.

Setting 1PPS may yield inaccurate results when the receiver is not tracking enough satellites to set time or maintain a highly accurate time solution.

When enabled, the pulse is available on pin 9 of the RS-232 Serial 3 port and the BNC connector of the 26-pin to multi-connector cable (two models are available). This menu item is available on SPSx51 or later receivers.

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.

IonoGuard™ (SPS986 only) – From v6.28/5.68, there are now three modes for IonoGuard. The goal of these changes is to make IonoGuard available by default in situations where it provides value with minimal risks. For safety, IonoGuard needs to be disabled if required. The current primary risk is very poor base station locations.

The following modes are available:

  • Disabled – The receiver will not perform any IonoGuard processing.

  • 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.

  • 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.

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.

NOTES – 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.

Internal Battery UPS – By default, this field is set to Enable. When enabled, the internal battery is used as backup to external power loss. When disabled, the internal battery will not be used as a backup to external power loss. If you disable the UPS for the internal battery, you can then set the UPS timeout period in seconds. The front screen shows a message that states the unit is powering off in xx seconds time whenever the external mains power is disconnected or turned off. Use this feature with caution.

Power on Voltage –

  • Port 1 – The voltage at which the receiver will power on if powered from port 1. The range is 10.8 to 15.0 V DC. The default is 11.8 V.

Front Panel Display

Brightness – Sets the brightness of the front panel display as a percentage of the maximum. The available settings are 13%, 25%, 38%, 50%, 63%, 75%, 88%, and 100%.

Rotation – Rotate the front panel display and the menu controls 180 degrees. Used when the receiver is inverted for convenient mounting.

Power Saver –

  • Auto – If external power to the receiver is removed, the display will go into power saving mode meaning the display will not be visible until a button is pressed.

  • Enable – The displays turns off after the last button is pressed, by the time delay specified in the Power Saver field.

  • Disable – The display always remain on.

    When a SIM card is installed in the internal modem, the Power Saver mode cannot be disabled. The screen remains active for a short time and then turns off to save on power.

Power Saver Timeout – Select a time delay to turn off the receiver display. The default is 60 seconds.

Configuration –

  • Enable – Allow the front panel controls to be used to make changes to the configuration of the receiver.

  • Disable – Do not allow the front panel controls to be used to make changes to the configuration of the receiver. If disabled, the operator must use the web interface, serial ports etc to configure the receiver.

Suppress Warning Msg – When enabled, the warning messages are no longer displayed on the front screen of the receiver.

Antenna LNA Voltage –