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Second Generation Radar Sensors for Adaptive Cruise Control
Second Generation Radar Sensors for Adaptive Cruise Control
RoadEye is an advanced second-generation Adaptive Cruise Control (ACC) system designed for both passenger and commercial vehicles. It utilizes a proprietary 7-beam forward-looking radar (FLR) technology operating at 77 GHz to meet the automotive industry's demand for enhanced ACC systems.
First-generation ACC systems have been available for some time, evolving from regular cruise control systems. These systems ensure vehicles maintain a safe distance from the vehicle in front, even if it slows down or accelerates. However, current systems face limitations due to technology constraints and high costs, hindering widespread adoption.
The new radar sensor for ACC is under development, with the flexibility to modify functionalities. Key specifications include a 76.5 GHz radar, 7 beam wide azimuth coverage, 8 receive channels in MMIC, high-resolution multiple waveform, and multiple target tracking adaptive algorithms. The design focuses on cost-effectiveness and mass production, featuring a low-cost MMIC chipset, low-profile Thixo-molded magnesium antenna, and a single box design with a CAN interface.
Current radar sensors have limitations such as a narrow angle of view and resolution, making stop-and-go functions unreliable. They also have a wide blind spot, failing to detect vehicles merging suddenly. The systems require a direct line of sight to function reliably, especially in curves, and are rated Class II, needing a minimum curve radius of 500 meters, whereas a 125-meter radius is ideal for safe ACC application.
Groeneveld, in collaboration with partners in Israel, has developed a second-generation radar sensor that significantly improves functionality and reliability. It features 7 receiver antennas positioned at specific angles, providing a larger view angle and higher resolution.
- Seamless stop-and-go functionality down to 1 meter.
- 40º coverage for close-range cut-in by neighboring vehicles.
- Detection and tracking of both static and dynamic objects.
- Detection of mud and snow over the antenna aperture.
Prototypes are available for testing, allowing suppliers and manufacturers to experience the new radar sensors. Preparations for serial production are underway, expected to start by mid-2006.
The diagram illustrates a vehicle equipped with a RoadEye Forward Looking Radar Sensor (FLRS) with three lobes to determine the distance to a vehicle ahead. Additional lobes provide sensitivity to objects closer to the vehicle and help determine the position of fast-merging vehicles.
Catalog excerpts
Designed for perfomance: • 76.5 GHz radar • 7 beam, wide azimuth coverage (+ 20º) • 8 receive channels in MMIC • High resolution multiple waveform (FMCW & Range-Doppler) • Multiple target tracking adaptive algorithms • Curved path prediction using integrated rate-gyro Second Generation Radar Sensors for Adaptive Cruise Control Designed for cost and mass production: • Low cost MMIC chipset design • Low profile Thixo-molded magnesium atenna & housing • Single box design • CAN interface • Meets all applicable industry standards and specifications • C-series ready for installation and testing RoadEye is an advanced 2nd generation Adaptive Cruise The second generation radar sensor for Adaptive Cruise Control is a product under development. We reserve the right to modify any of the functionalities of the product as described in this brochure. Control (ACC) system for passenger and commercial vehicles. Based on proprietary, 7-beam forward looking radar (FLR) technology at 77 GHz, RoadEye is designed to meet the automotive industry’s demands for Enhanced - ACC systems. if the latter slows down or accelerates. Current systems, which are occasionally featured in passenger cars in the higher price ranges, however, have several generally established now. An adaptive limitations that impede large-scale available for some time now. It is a cruise control must ensure that the implementation. These limitations are logical development following regular vehicle will always keep sufficient mainly caused by the technology that is cruise control systems, which are distance to the vehicle in front of it, even used and a high cost price. Groeneveld Groep B.V. • Stephensonweg 12, 4207 HB Gorinchem • Postbus 777, 4200 AT Gorinchem • Nederland Tel. +31 183 64 14 00 • Fax +31 183 62 49 93 • Internet: www.groeneveld-groep.com • E-mail: [email protected] Adaptive Cruise Control’ has been YOUR EFFICIENCY IS OUR CHALLENGE
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Limitations of the current generation of radar sensors: blind spot is too wide. A car that suddenly merges will not be detected, – 77 GHz – that was assigned to radar • With the ever-increasing traffic grows systems of this kind, complex the need for a stop-and-go function • The car ahead must remain within • Because of the high frequency that makes driving on a busy motorway direct sight for the system to continue that suffers from regular traffic to function reliably, i.e. also in curves. congestion safer and less exhausting. There is a classification that specifies Current sensors have a limited...
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