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Vehicle Models in GNSS Receiver Testing
One of the most important aspects of testing the reliability and performance of any GNSS receiver is testing the dynamic performance of the system in its intended application. And while this may seem like a prime case for taking the receiver on the road (or rail, sea, air etc.) for "live-sky" testing, all the usual limitations of this methodology will apply: the tests are inherently random and non-repeatable, and the costs associated with taking staff and equipment out of the laboratory are always underestimated.

Fortunately, there is a solution that can be used in the relative calm of the test laboratory in just the same way that the receiver's static performance is tested. And that is by using a GNSS simulator under software control.

Spirent's SimGEN™ software comes with a range of vehicle models each of which provides a realistic representation of the movement profile of a specific type of vehicle, be it a road vehicle, boat, aircraft or spacecraft. The model appropriate for the receiver under test can be applied alongside the GNSS simulation, allowing GNSS receiver designers to test the dynamic performance of their products with a realistic representation of the vehicle motion likely in the final application.

Each vehicle model allows the user to input a number of relevant variables, such as speed, acceleration, rate of turn etc. These variables are specified via easy-to-use input screens that enable users to create complex motion profiles with just a few simple keystrokes. And certain models allow application-specific scenarios, such as the option to choose any one of ten different sea states for the ship model. Importantly, all motion profiles can be saved and used again, ensuring that GNSS receiver testing is fully repeatable.
By: Andy Walker - 6/8/2012 10:33:04 AM
Tags: GNSS Receivers

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