Next Radar Generation Sets New Technical Standards
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© [M] Continental
Next Radar Generation Sets New Technical Standards AUTHOR
Norbert Hammerschmidt is Head of Program Management Radar of the Business Unit Advanced Driver Assistance Systems at Continental in Lindau/Bodensee (Germany).
While the fifth generation of Continental radar sensors is in production globally, development work on generation six has already commenced. The initial work focus is on versions for the task of 360° surround-view monitoring with a range of considerably above 100 m – which means advancing short range-radar to surround radar. These versions and the subsequent long-range radar versions will benefit from a new technology with further increased performance features.
MORE DEMANDING REQUIREMENTS
The significance radar sensors have for driver assistance systems can be seen in the 70 million radar sensors which Continental alone has delivered to the market between 1999 and the end of 2019. A big part of that was the indus trialization of the fifth generation of short- and long-range radar sensors with 77-GHz technology (Surround Radar, SRR, and Advanced Radar Sensor, ARS) and their profile of compact, scalable, modular design which began in 2017. Utilizing the modular system of the fifth generation radar sensor is instrumental
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to implementing forward- and backwardlooking application in the near field and also combined solutions including a long-range radar path for highly auto mated driving. In the meantime, the requirements to radar sensors keep going up. One ele ment of that is the task of reliably detect ing powered two-wheelers and Vulnerable Road Users (VRUs), mostly pedestrians and cyclists. Both pose a challenge to sensor technology, FIGURE 1. Another ele ment is assisted driving and in the future Automated Driving (AD). Both require an ever-higher sensor performance in terms of availability, sensitivity, resolution, and
range. As part of the functional interac tion with camera and lidar, a reliable detection on the radar path is therefore gaining in importance. Detecting the vehicle surrounding with radar technology is one of the current challenges. To achieve such a 360° view, surround radar sensors are installed at each vehicle corner (front and back) behind the color-coated bum pers. As there is no radome available made from a material that is specifically radio-frequency wave-permeable with this kind of installation (as typical for a centrally located long-range radar), the radar signal can be impacted by additional back-scatter and attenuation effects originating from the bumper structure and the color layer. Neverthe less, a sensors’ selectivity and range shall be higher for better object recog nition. Challenges of this kind were the motivation for Continental to develop its sixth generation of radar sensors with an initial focus on surround coverage versions. This is reflected in a name change: In contrast to the previous usage, the abbreviation SRR no longer stands for short-range radar but now means surround radar. As the new sen sors already deliver
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