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Selecting GNSS Constellations

If your SecureSync is equipped with a GNSS receiver other than a Res-T model, it is capable of tracking several GNSS constellations simultaneously. (See also Determining Your GNSS Receiver Model.)

Note: As of System software version 5.7.0, the Multi GNSS Option is no longer required to receive several constellations simultaneously. After an upgrade, the previous settings will be maintained.

Below are all receiver models listed, and their supported GNSS constellations:

Trimble Res-T®

  • Constellations: GPS

Trimble Res-SMT™ GG

  • Constellations: GPS, GLONASS, QZSS

u-blox® M8T

  • Constellations: GPS, Galileo, GLONASS, BeiDou, QZSS

In new units, per default both GPS, and Galileo are enabled. Either selection can be disabled, but not both of them (if both are turned off, no changes will be saved and the last constellation setting will be preserved).

To verify if satellite signals for the selected GNSS constellations are received, see Determining Which GNSS Satellites Are Received.

Configuring GNSS Constellations

To configure which GNSS constellations SecureSync's GNSS receiver shall track:

  1. Navigate to INTERFACES > REFERENCES: GNSS Reference.
  2. Click the GEAR button next to GNSS 0. The GNSS 0 window will open:
  3. Under Selected Constellations, review which constellations are currently tracked, and apply your changes. Note the following:
    • The u-blox M8T receiver is capable of receiving multiple GNSS constellations simultaneously; the table below shows which combinations are possible:

      Note: The augmentation systems SBAS and QZSS can be enabled only if GPS operation is enabled.

      Note: Should you select more than 3 + QZSS constellations, you will receive a Constellation Error once you click Submit (ConstError).