Automotive & motorsport
group’s future needs. For the vehicle environment generation,
WMG can apply multiple tools such as XPI Simulation’s iOS. LabVIEW enabled the group to create an actor that can communicate bidirectionally with the XPI Simulation iOS and extract the necessary information about the scene for the RF emulation.
Closed-Loop RF Simulation. Image courtesy of WMG.
Lost sateLLites
The user interface of the RF infotainment simulator allows the vehicle to drive anywhere in the world. Image courtesy of WMG.
A typical test generates the GNSS signals, depending on the simulated location and scene. The location data is conver ted into the actual satellite positions to construct a satellite constellation signal, which is transmitted to the vehicle navigation system. When the vehicle drives through an urban environment, the software automatically decreases the signal strength and the number of visible satellites. These adjustments can also be implemented manually through a user interface. Another use case involves the validation
of vehicle-to-vehicle (V2V) communication. One V2V unit on the real vehicle inside the simulator and one V2V unit externally provide information from a vir tual car to WMG’s vehicle. The driving scene simulator generates a vir tual car merging in front of the car and then performing a braking action. The location, velocity, and other information are sent over TCP/IP to the RF emulator. Besides the RF satellite signal for the one vehicle (transmitted over the air), the NI RF emulator generates a second satellite constellation signal that is fed into the second V2V control unit (using a cable). This unit locates its position and constructs a V2V message to be sent over the air to the real vehicle in the simulator room. The intelligent vehicle then can make decisions such as braking or initiating emergency avoidance manoeuvers.
VaLue of PartnershiPs
Our software architecture uses the LabVIEW Actor Framework. Image courtesy of WMG.
The NI platform allows customisation through LabVIEW. The NI sales team suggested WMG work with an Alliance Par tner for the implementation, and this proved to be key to the group’s success. Working with Alliance Par tners was a real benefit because they have strong experience with the NI platform and tools, and they can provide reliable solutions. WMG has already performed closed-loop
This diagram offers a detailed view of the GNSS software that controls the RF emulation. Image courtesy of WMG.
GNSS position transmission by combining the environment simulator and RF emulator into one system. By doing this, WMG were able to vary signal strength and satellite visibility based on scenery in an HIL environment. The group plans to emulate current and future constellations, for example, what drivers will see when they drive in Tokyo in 2025. The NI equipment provides a flexible
platform for WMG’s connectivity research and enables it to fur ther research topics like channel emulation and channel sounding.
NI 40
www.ni.com February 2019 Instrumentation Monthly
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