Page 4 - GNSS Simulation - A Guide to Testing

Why Use a Simulator to Test TTFF?

Generally, when testing TTFF it is advisable to use a GNSS simulator to conduct the testing. The
use of a simulator is preferable to live-sky testing as it is quicker, more convenient and allows for
exact and consistent signal parameters including signal stability and noise levels.

When using a LabSat simulator you have the choice between recording a live-sky scenario and
replaying this as your test RF signal, or create a bespoke scenario at the time, date and location
of your choosing by using the SatGen simulation software. Both methods allow complete control
over the scenarios for repeatable and consistent testing.

LabSat 3 Wideband replaying a
GPS scenario created using SatGen

LabSat’s Application Programming Interface (API) provides additional control and testing
automation as scenarios can be programmed to automatically repeat or play in a set order. This

improves efficiency by allowing significant testing programmes to be run continuously, without
the need of human supervision.

Further efficiency can also be gained by testing multiple devices at once with a single LabSat.
Adding an RF splitter into your test set-up allows multiple devices to receive the same test
signal.

The level of control afforded by a LabSat Record & Replay simulator extends to the ability to test

individual or combinations of constellations and signals. This is ideal for testing multi-
constellation receivers, the use of which is increasing across most sectors.

Page 3