Motion Simulation with GNSS Scenario Software

For most GNSS receivers, static navigation accuracy is only part of the story. The ubiquitous automotive satnav system is the most common case where dynamic accuracy is essential. And users will only be satisfied with the performance of their receivers if turn-by-turn navigation instructions are both accurate and timely.

So while you may be familiar with the concept of testing the performance of a GNSS receiver in the lab with a GNSS simulator, how can this be extended to take into account the dynamic navigational accuracy required of an automotive (or even marine) system in which the relative positions of the receiver and the satellites are continually changing due to the movement of the vehicle carrying the receiver? The answer comes in the form of GNSS scenario software, such as the SimREPLAY software package for the Spirent GSS6700 Multi-GNSS Constellation Simulator.

The GSS6700 generates similar RF signals to those that would be seen by a GNSS receiver when installed on a vehicle with time, place and motion pre-defined in a test “scenario”.

This enables the performance of the receiver to be assessed in the laboratory as if it were receiving RF signals from real satellites whilst stationary or performing complex user defined maneuvers.

“Truth” data from the simulation is available to facilitate results analysis which makes the GSS6700 with SimREPLAY ideal for quantifying and comparing the performance of GNSS receivers in such areas as:

  • Design verification
  • Production test in manufacturing
  • Comparative evaluation
  • Statistical data-generation through extended and repeated tests
  • Incoming product test

Unlike testing with live-sky signals, the users of a GSS6700 with SimREPLAY can replicate the test environment weeks, months or years apart to compare a number of receivers under identical test conditions

So by adding motion simulation to the simulation of the GNSS system, receiver manufacturers can be confident that their products will provide the dynamic navigation accuracy that today's users’ demand.

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