Verify receiver performance in a true-to-life synthetic environment

Multipath and signal obscuration can cause significant error in GNSS receivers. Multipath errors can vary from a few metres to hundreds of metres, depending on satellite geometry and environmental conditions. Accounting for these occurrences is vital in most positioning, navigation, and timing solutions.

Sim3D is an innovative 3D modelling system that creates a realistic environment for the testing of multipath and obscuration effects. Simulated GNSS signals interact with fully customisable models and environments, giving a level of detail, control, and realism not available in other solutions.

Download brochure →

Features & Benefits

Realistic multipath and obscuration simulation
Multipath and obscuration is simulated based on a synthetic 3D model. Real-life locations can be regenerated and used in simulation to recreate the multipath signature of that location. In addition, traffic, crowd, and other objects are used in the simulation to provide a level of realism not available in any other product in the market.
Ability to simulate real life applications
Define your antenna carrier as a vehicle or pedestrian, then position your antenna relative to the carrier centre of gravity. The multipath and obscuration are computed considering the antenna carrier body position and motion. This provides valuable insight for optimising the location of the antenna for multipath/obscuration.
Better level of control and analysis with multipath simulation
Sim3D provides a level of control not available in any other multipath/obscuration simulation approaches. Choose which constellations to simulate, the number of reflections per multipath, the number of multipath signals per LOS, and much more.
Fully verified with real-life data
The performance of Sim3D simulation relative to field data has been exhaustively assessed, with good indicative results shown.
Full level of customisation
Sim3D enables you to choose between creating your own 3D models and using predefined models provided by Spirent. Many generic 3D model formats are supported using provided convertors, meaning existing or purchased models can be easily imported.


Extreme flexibility

Sim3D offers users the flexibility to use either predetermined 3D models, or to generate new models defined by the user. In addition, externally generated models can be imported using provided converters. Sim3D supports both static scenarios and dynamic motion, with trajectories that can be either imported or generated within the software.

Easy to use

Supreme ease of use

Sim3D has been designed to package complexity in simplicity. Complex and realistic multipath signals, as well as line of sight, are mapped visually with colour coding. Spirent-generated integrations mean Sim3D can be easily incorporated into hardware-in-the-loop testbeds.


Comprehensive testing tool

Sim3D supports all GNSS constellations, frequencies and codes generated by our industry leading simulation systems.

Gears White

High level of control

As well as choosing from a comprehensive range of signals, users can switch obscuration mode and multipath on and off; define the number of reflections per multipath signal; and define filtering algorithms to simulate only multipath in chosen delay/power ranges.

Accurately modelling and testing multipath signal propagation with Sim3D

Integrating third-party tools with a true-to-life GNSS signal environment

Could Sim3D work for me?

Our experienced and specialised GNSS engineering team will be able to answer any questions you might have about multipath modelling and testing – and how Sim3D could add depth and realism to your test bed.

Get in touch →

Questions for Spirent experts? Submit a request for information.

Contact us