Selecting a GNSS Receiver Mode

When connected to a GNSS antenna that receives a GNSS signal, VersaSync can use GNSS as an input reference. The factory default configuration allows GNSS satellites to be received/tracked with no additional user intervention required.

However, there are several user-configurable GNSS settings:

• The Receiver Mode function allows the GNSS receiver to operate in either a stationary mode (“Standard” or “Single Satellite” modes), or in a mobile mode environment e.g., in a vehicle, ship or aircraft.
• Offset [ns]: to account for antenna cable delays and other latencies
• Receiver dynamics: to optimize performance for land, sea or air operation
• The ability to delete the stored GNSS position information (latitude, longitude and antenna height).
• The option to determine when a resurvey is to be performed (supported only by newer GNSS receivers).
• The option to select your constellation types
  
  

To configure the GNSS Receiver Mode for your VersaSync unit:

1. Navigate to INTERFACES > REFERENCES: GNSS 0. The GNSS 0 Status panel will open.
2. Select Edit in the bottom-left corner. The GNSS 0 configuration window will open:



3. Select the desired Receiver Mode, and click Submit.

GNSS Receiver Modes

The receiver modes are:

• Mobile Mode: This is the default mode for VersaSync. In Mobile Mode, GNSS surveys (see below) will NEVER be carried out since the position status is updated in near real-time. VersaSync will go into synchronization shortly after beginning to track satellites.
• Standard Mode: While the Standard Mode tends to be the most accurate GNSS Receiver Mode, it can only be used for stationary applications, i.e. the VersaSync unit must not be moved. In Standard Mode the so-called GNSS survey will be performed as soon as at least four GNSS satellites become available and no previously carried out survey was found. Upon completion of the survey the GNSS receiver will lock-in the calculated position and will enter Standard Mode. Once the survey is completed, less than four satellites will provide a valid Time and 1PPS signal.

• Single Satellite Mode: This mode is designed for stationary applications which cannot track at least four GNSS satellites for at least 33 minutes continuously in a 12-hour time window so as to complete the GNSS survey. This occurs frequently in areas with limited view of the sky (e.g., "urban canyons").

  In Single Satellite Mode, the GNSS receiver will be considered a valid input reference as long as:

  • you have manually entered a valid position for your antenna location (instructions can be found under Manually Setting the GNSS Position and Determining Your Position).
  • the GNSS receiver continues to track at least one qualified satellite.

  Note: VersaSync is designed to provide the most accurate time in Standard Mode. The Single Satellite Mode should only be used if the GNSS receiver could not complete a survey.