Member: HORIBA, 3D Mapping Solutions GmbH
Featured Standard: ASAM OpenDRIVE®, ASAM OpenSCENARIO®
Currently, vehicle-in-the-loop (ViL) testing on chassis dynamometers is becoming a worthy alternative to testing procedures conducted on real proving grounds, test tracks and public roads. In particular for the testing of advanced driver assistance systems (ADAS) and autonomous driving functionalities the ViL approach entails significant advantages such as the reduction of testing time and costs, enhanced reproducibility, safety and the fact that testing can be conducted already during early development stages. For ViL testing, the vehicle under test does not interact with real traffic participants or road signs. Instead, the chassis dynamometer is equipped with a set of devices - so called stimulators - each responsible for stimulating a respective sensor system (i.e. camera, lidar, radar) and therefore creating an artificial environment, the vehicle under test (VuT) may interact with. However, to obtain results which are as close to reality as possible, appropriate data input formats are required.
One aspect of such a virtual environmental twin are the simulated tracks onto which the VuT is driving. Besides the realistic physical input variables determining the simulated road load, the simulated track must also provide objects such as signs, lane markings and other traffic control elements which may be perceived by the VuT’s sensors.
ASAM OpenDRIVE is an ideally suited format, which includes all necessary static aspects of the virtual environmental twin in form of an XML syntax: The various road geometry parameters as for example distance, curvature and elevation can be derived to simulate the respective road load by means of the dynamometer. Besides, these data describe the 3D layout of the simulated track but also additional objects such as road signs, traffic lights, surface profiles, railroad elements, tunnels, bridges linked to the road geometry. In addition to ASAM OpenDRIVE, the ASAM OpenSCENARIO format is used to insert all the relevant dynamic elements such as traffic participants or special target vehicles. From these datasets the respective parameters for the particular test cell devices as camera, lidar and radar stimulators are derived to create the artificial environment.
The OpenDRIVE and OpenSCENARIO standards created by the ASAM initiative and the ongoing OpenX Standard developments enable 3D Mapping to provide HD Map and Simulation solutions of outstanding quality, which can be used for multiple Simulation purposes of our customers in various Simulation software packages or simulator platforms.
Dr. Gunnar Gräfe / CEO 3D Mapping Solutions GmbH
HORIBAs future test cell combines chassis dynamometers with the datasets from 3DM (Figure 1).
By means of a virtual environmental twin the application is able to bring every real existing street into the test cell. Therefore, the van-based survey system from 3D Mapping Solutions is used worldwide for digitizing proving grounds, race tracks and public road networks with high accuracy and resolution using high-resolution scanners and multiple calibrated cameras (Figure 2).
The next evolution of testing starts right here. We are very delighted to move one stage ahead to support autonomous driving and ADAS testing on HORIBA chassis dynamometers.
Dr. Robert Plank / President HORIBA Europe GmbH
Afterwards, the digital road data is used to create an identical digital environmental twin of the real-world road as base for a valid Simulation. All road and traffic related objects are precisely extracted from the scanner and camera data and processed to the corresponding virtual objects (Figure 3).
The technology is used to produce precise high-definition reference maps in ASAM OpenDRIVE format or to generate high-fidelity 3D environments including appropriate textures and material representations.
With the support of ASAM OpenDRIVE, HORIBA provides testing applications and supports development phases as early as possible. Moreover, use cases in the Homologation of ADAS and autonomous features as well as aftermarket business cases such as periodical technical inspections, are supported (Figure 4).
New vehicle technologies demand suitable test methods. By combining our chassis dynamometers with the ASAM OpenDRIVE and ASAM OpenSCENARIO standards we are closing the gap between the real world and laboratory-based testing.
Andre Engelbert / Global Application Manager HORIBA Europe GmbH