MSS Configuration

Use this page to configure the receiver to track OmniSTAR satellites or to use Trimble RTX correction services (with xFill technology).

If OmniSTAR is selected, the following options are available:

Preferred Source of Data – When the OmniSTAR service has been selected, then select either External or Internal. If the receiver is configured to use both internal and external data, it uses the preferred source when both are available:

• External – The OmniSTAR data is derived from an external source such as an NTRIP Client over an internet connection.

• Internal – The OmniSTAR data is derived from the L-Band signal received via an appropriate antenna.

External OmniSTAR Data – Set the receiver to use an external OmniSTAR data stream if available on an Ethernet, NTRIP, serial, Bluetooth, or USB port and then use one of the following modes:

• Don’t Use – Do not use an external source of OmniSTAR data.

• Auto – Tracking is enabled and, if more than one external OmniSTAR service is available, the most precise mode is used.

• Selecting specific services – The following specific services are available for selection if the receiver has an appropriate valid subscription. Selecting one of these modes restricts the receiver from using other external OmniSTAR services:

  • HP

  • G2

  • XP

  • VBS

Internal OmniSTAR Demodulator – Set the internal OmniSTAR demodulator to the required mode.

• Off – OmniSTAR tracking is disabled.

• Auto – Provides the best solution based on the error estimates. This delays the transition to OmniSTAR HP until the HP solution reports it is better than the VBS solution.

  Be careful how you treat VBS; in some locations it is in NAD-83. By default, the receiver provides NAD-83 VBS (in the USA) positions and ITRF2014 for HP. However, you can configure the receiver to transform the NAD-83 VBS positions to ITRF by selecting the following check box.

• Selecting specific services – The following specific services are available if the receiver has an appropriate valid subscription. Selecting one of these modes restricts the receiver from using other internal OmniSTAR services:

  • HP

  • G2

  • XP

  • VBS

SV name – Select which OmniSTAR satellite beam is to be tracked by the receiver. If you do not know the appropriate OmniSTAR satellite name, select Auto so that the receiver scans for the OmniSTAR satellite whose spot beam is closest to your current location. If the required satellite name does not appear in the list, select Custom and then enter the frequency and bit rate of the required satellite.

Seed with RTK – Select this check box if the primary positioning mode is RTK and you need to use the OmniSTAR solution for short RTK outages. The OmniSTAR engine is seeded with the current RTK Fixed position at a 1 Hz rate. If an RTK Fixed position solution becomes unavailable, the OmniSTAR HP position solution will be used until it is restored. The RTK position is transformed into the OmniSTAR HP datum by using the Datum Offset parameters. You can manually enter the Datum Offset parameters or have them measured using the Siteworks or SCS900 Site Controller software.

NAD83 - ITRF Transformation – In North America, the OmniSTAR VBS datum is NAD-83, all other OmniSTAR services use the ITRF datum. Enable this feature to transform the VBS positions from NAD-83 to ITRF datum.

Max Data Outage – If the OmniSTAR signal has been lost for the amount of time set in this field, the receiver discards the HP/XP/G2 position or the VBS correction. For OmniSTAR VBS, even though it discards the correction, the firmware still generates VBS positions until the time set in the DGNSS Age of Correction field also expires.

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