Setting GNSS Receiver Dynamics

Receiver Dynamics further refine the reception characteristics for the individual receiver modes and determine if the receiver will automatically resurvey after a reboot.

Caution: If you select a setting that does NOT resurvey, and subsequently relocate your unit (antenna) by more than 100 m, u-blox M8T receivers will NOT detect the new position, and hence provide an incorrect time.

For more information about the GNSS Survey, see Performing a GNSS Receiver Survey.

For more information on Receiver Modes, see Selecting a GNSS Receiver Mode.

  1. Navigate to INTERFACES > REFERENCES: GNSS 0.
  2. Under the Main tab of the GNSS 0 status window, the line item Receiver Dynamics will indicate the current setting.
  3. To change the setting, click Edit in the bottom-left corner. The GNSS 0 configuration window will display:

  4. Select a setting and click Submit.

  • Note: This option only applies to the M8T receiver in your device, not to SAASM GPS receivers (if equipped).

    Caution: If you select a setting that does NOT resurvey, and subsequently relocate your unit (antenna) by more than 100 m, the receiver will NOT detect the new position, and hence provide an incorrect time.

    The following Receiver Dynamics exist:

    • Land (Resurvey/No Resurvey):

      When used with the Mobile Receiver Mode, the receiver is adjusted for typical dynamic land-based applications.

      When used with the Standard Receiver Mode, this setting also will automatically initiate a resurvey after VersaSync reboots, in order to account for a possible relocation.

    • Sea: The receiver dynamics will be optimized for mobile motion patterns typical with marine applications, resulting in greater timing accuracy, and avoiding premature loss of synchronization.
    • Air: The receiver dynamics will be optimized for acceleration forces typically experienced in civil aviation applications.
    • Stationary (No Resurvey): In Standard Mode, the receiver is set to a non-dynamic value for stationary applications; there will be no automatic resurvey after a reboot. Hence, should a unit be relocated, you need to delete its position, thus initiating a new survey.

    The following table summarizes the different settings and their inter-dependencies:

    Mode Application Survey? (Re-)Survey – When? Receiver
    Dynamics
    Mobile mobile Never Never Land
    Air
    Sea
    Standard stationary only Yes: needs ≥ 4 satellites for 33 minutes continuously in 12-hour window (A) After any reboot, if the Dynamics setting is set to "Land – Resurvey".
    (B) If no previously carried out survey has been found after a reboot
    (C) When the unit detects it has been re-located
    (D): After "Delete Position" command was submitted    		 Land – Resurvey
    Stationary – No Resurvey
    Single Satellite stationary only Manually set position (A) On reboot, if no hand-set position is detected
    (B) After "Delete Position" command was submitted    		 Stationary

The following table illustrates the interdependence between Receiver Dynamics, Receiver Mode (see Selecting a GNSS Receiver Mode) and receiver type:

Receiver dynamics, ~modes, ~ dynamics, ~ types

Receiver Mode Receiver Dynamics
Land
(Resurvey)		 Sea Air Stationary
(No Resurvey)
Single Satellite irrelevant irrelevant irrelevant irrelevant
Standard
Mobile (with u-blox receivers)

Notes:

  • The u-blox M8T receiver now uses Land to indicate it will RESURVEY on reboot, and Stationary to indicate it will not resurvey after reboot.