Simulating roadside buildings with SimGEN Vertical Planes Feature

One of the major considerations in designing a GNSS receiver for automotive applications is to ensure that the performance is not unduly affected by roadside buildings. Such structures can both obscure satellite signals from the receiver and reflect them, leading to potentially complex multipath effects.

Clearly, it is impractical for a receiver designer to take his or her latest project “on the road” to test out its performance in the presence of every possible size, shape and combination of roadside buildings. However, help is at hand in the form of the Vertical Planes feature of Spirent's SimGEN™ Windows software.

The Vertical Planes feature enables users to define a series of vertical, rectangular obstructions (or planes) on either or both sides of the vehicle's direction of travel. The software gives complete freedom to define the distance, height and width of each obstruction. Quite simply, the simulator signals are obscured if the planes occur in the line-of-sight path between the simulated satellites and the vehicle antenna. And the level of obscuration will depend on both the height of the planes and the relative distance from the vehicle.

The Vertical Planes feature can also be used to simulate the effect of a road running through a cutting by replicating the obscuration of low-level satellites while the vehicle is in the simulated cutting.


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