Driver assistance systems have become more popular with the introduction of 24 GHz radar systems for passenger cars. Beside Stop and Go applications, rear-looking lane change assist and blind spot sensors are now being addressed by OEMs and sensor manufacturers. The Lane Change Assist application is a driver assistance function which has different areas of surveillance. A bird's eye view of the specified fields of view is depicted in Figure 1. If any non-stationary object is detected in the neighbor lanes, it has to be detected and reported to a warning algorithm. This warning signal to the driver will be given at a longer range (50m) if there is a vehicle approaching from behind at high relative speed. Or it may be initiated only at very short distance, if a reflecting vehicle is cruising at almost the same speed as the radar vehicle. The field of view is selected to cover a warning zone adjacent to the radar vehicle (marked between the lines B and C), as well as an area containing three lanes (left neighbor, driving and right neighbor lane) up to a distance of typically 50m (back to line A). The system shall be able to cover three lanes even in curves of a typical minimum radius. In the related ISO Standardization this type of system is called LCDAS, Lane Change Decision Aid System. The document describes in detail the positions of the lines A-D as well as the minimum curve radius at which the system has to operate. Typical positions, requested by OEMs for A are 50m or 70m, and for B 5m, although specifies only 30m for A and 3m for B. Three classification types of such LCDAS systems are defined in the literature. A class I system would only cover the 'Blind Spot', i.e. roughly the area between the lines B and C, class II covers the area between A and B, and class III is a combination of both and covers the distance between A and C. Line C is located at the center of the 95. percentile eyelipse. This paper presents a Lane Change Assist system, consisting of two 24GHz radars, which has been developed since 2002 and is now in volume production. After a description of the application, the radar technology behind it is presented. Performance and frequency allocation aspects are discussed. Finally the latest development targets of the second generation system are demonstrated.
A 24GHz automotive lane change assist system
Ein Fahrspurwechsel-Assitenzsystem für Fahrzeuge im 24 GHz-Bereich
2006
4 Seiten, 7 Bilder, 1 Tabelle, 3 Quellen
Conference paper
English
24 GHz Automotive Lane Change Assist System
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