What is a GNSS Test Scenario?

Although the word “scenario” has been much overused (and misused) in common language, it has particular relevance in terms of testing GNSS receivers. The word can be correctly defined as “an outline or model of an expected or supposed sequence of events”, and this provides an insight to the importance of a test scenario in assessing and/or comparing the performance of one or more GNSS receivers.

A GNSS simulator under software control can be used to generate test scenarios of varying degrees of complexity. And, importantly, once the scenario has been defined and stored, it can be recreated precisely time and time again. The scenario will be made up of any combination of factors, including aspects such as multipath effects, motion profiles, electromagnetic interference, loss of satellite signal etc, but it will not be fixed to any specific location.

Spirent's GNSS simulators can generate data for multiple scenarios and multiple locations, offering massive flexibility in testing GNSS receivers. For example, a simulator with 10 scenarios and six locations is equivalent to 60 individual live sky tests, saving both the time and relocation expense traditionally associated with taking the receiver out into “the real world”.

What's more, each test is completely repeatable. In comparison, live sky testing can never be completely repeatable.


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