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Gigabit data logger for high-speed and ADAS applications

Validation of intelligent radar sensors improves the safety of autonomous driving

For the development and validation of systems for autonomous vehicle management, real traffic scenarios are usually simulated and tested in the laboratory. Since pre-processing is carried out directly in the sensor front end with modern radar sensors, this can result in a serious gap in coverage during the testing and validation of object detection. In addition, the optimization of algorithms for testing in real traffic is very complex and seldom reliable.

The DP²4R Gigabit data logger collects raw radar signals between the sensor and preprocessing. The stored signals can then be fed back via the same interface. This allows real traffic situations to be replicated repeatedly in the laboratory and to optimize the processing chain of radar signals. The testing and validation of radar signal processing can be moved from the road to the laboratory. This saves time and allows the reliability of the data processing to be documented.

The special approach of the DP²4R data logger is to read raw data by means of a data head directly coupled to the radar sensor, store it and later feed it back in the laboratory. This requires a high data rate of more than 300Mbit/s per sensor, which is why these data can not be transferred via the system bus. For practical aspects of data analysis, apart from raw sensor data, other context-specific data like pictures from a camera and GPS position data can be recorded with synchronous precision.

The so-called “head unit” is based on a standardized unit which is specifically tailored to each sensor in order to enable safe and interference-free signal scanning as well as re-injection of the raw data. The sampled information is transmitted together with a time stamp via an internal interface to the central unit. The central unit consists of a car PC with a special insert card. Up to four head units with a cable length of 7m can be connected to it. An even larger number of head units can be connected via a second or third card slot.

For data storage, there are several “hot-plugged” SSD drives, which can be used to record data of any length by changing the media during recording. Other arrangements of storage media, such as aggregated RAID systems, can also be easily implemented. The entire hardware has been designed for the environmental conditions within the vehicle. The system is controlled via Ethernet with a machine-readable xhtml interface or a web browser. The external data transfer is carried out via Gigabit Ethernet or through media change.

The concept has been designed for future extension with additional sensors with a larger number of antennas and higher radar frequency.

Technical specifications

> DP²4R Head-Unit Hardware, specifically adapted to the respective radar sensor

> Flexibly customizable for almost any type of processor

> DP²4R Controller hardware and OS based on standard components

> 1 to 4 head units can be recorded at the same time

> 320 Mbit/s recording rate per head unit

> Data recording without interference with the radar function

> Camera and GPS data, and more. Can be recorded synchronously

> 2TB storage capacity (> 2 hours), expandable by removable drives

> 9-32 V power supply

> Resistant to environmental conditions in the vehicle

> Controller based on Linux with hmtl/xhtml interface

About embedded brains GmbH

embedded brains GmbH, with head office near Munich, is an owner-operated company that specializes in customized software and hardware development for high-performance single and multicore systems. The company was founded in 2005 by the electrical engineers Peter Rasmussen and Thomas Doerfler. Both have more than 20 years of experience and technical expertise in systems development, primarily in the fields of automotive technology, telecommunications and industrial automation, and worked previously as consultants and employees for Dornier, Eurocopter, Siemens, Alcatel Siemens, Thomson, Telenorma and Hilf Microcomputer-Consulting.

The managing directors and their development team advise and support companies from different sectors over the entire development process and with the help of partner companies also deal with series production and fabrication after the completion of prototype development. E&K Automation, Bang & Olufsen, Fraunhofer ESK and Fraunhofer ITWM, Tyco Electronics, MAN Diesel & Turbo as well as Bosch Rexroth AG, among others, are the customers of embedded brains.

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