Hybrid Physics-Based and Data-Driven Approach to Estimate the Radar Cross-Section of Vehicles
Takashi Owaki, Takashi Machida · 2019
Radar technology is one of the key technologies used in automotive scene recognition for autonomous driving systems and advanced driver assistance systems (ADAS). ADAS development requires the exhaustive validation of participating radar systems, and validation through actual test driving can be expensive. Although promising as a replacement for real test driving, virtual test driving is time-consuming owing to the fact that it simulates radar systems in detail, employing physics-based electromagnetic simulation techniques. This paper describes a hybrid physics-based and data-driven approach to reduce the computation time required for such simulations. The radar cross-section (RCS) of a vehicle is chosen as a target result obtained through electromagnetic simulations. The data-driven model is implemented with a cascade of two convolutional neural networks (CNNs) which are trained using ground truth data calculated with a physics-based ray-tracing method. The ray-tracing method is employed for generating both the training data and a part of the input to one of the CNNs. The correlation coefficient between the estimated and ground truth RCSs can be approximately 0.8 while the computation time is lower than 120 ms.