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A-GPS stands for Assisted GPS. This widely used technology involves providing additional data to the GNSS receiver by an alternative means of communication (e.g., via IP, or by manual data entry), thereby reducing the time for the receiver to acquire and track the actual satellite signals. This may lead to a significantly shorter time for NetClock to deliver a GNSS-based timing signal upon a “cold start” of the unit.

The A-GPS client is used to send assistance data to the GPS receiver. This is most useful in areas with poor GPS reception.

An A-GPS server, on the other hand, allows a unit to operate as a server, thus providing A-GPS ephemeris and almanac data to other devices e.g., a Spectracom GSG-series GNSS simulator.

The A-GPS functionality is only available with the following GNSS receiver models:

  • Res-SMT GG
  • u-blox M8T

To determine which GNSS receiver model is installed in your NetClock unit, see Determining Your GNSS Receiver Model.