Publication

Locating the exact position (relative and absolute) of vehicles is important in many active safety tests. Therefore TSS has launched this pre-study to evaluate the various options for measuring the relative and absolute positions of vehicles. This evaluation looks into the precision of the systems, their sampling rate, their compatibility with the industry’s requirements, and their cost. The most suitable systems that satisfy the industry’s requirements were navigation systems and the LORAN based systems. The navigation systems are systems that consist of GNSS receivers with RTK corrections that are integrated with inertial sensors. The LORAN based systems are based on calculating the time difference between the transmission time of a signal and the reception time at four different base stations, relative to the vehicles. These systems both have a high accuracy and a good sampling rate. Other systems were considered also, systems based on image processing. These systems had lower accuracy than the pre-set requirements. The recommended solution is a commercial navigation system for test objects not subject to risky situations (probable impacts, rollovers, etc). These systems have high accuracy and suitable measured variables. The range of these systems can be expanded to include FOT activities using SWEPOS reference signals. Oxford Technologies RT4002 with a RTK base station was the recommended system after comparing the available products. For test objects exposed to risky environments, a dedicated LORAN system is recommended. A system from LPM is commercially available and is the primary recommendation. Alternative solutions including proposals for customized systems are included in the report. Documentation of the reviewed systems and possible communication systems for the test site(s) have also been provided.