Ensuring ADAS safety with multi-sensor fusion: Page 3 of 4

June 11, 2019 //By Thomas Schneid, Infineon, and Marie-Sophie Masselot, Leti Tech Research Institute
Ensuring ADAS safety with multi-sensor fusion
Sensor fusion is a key task at the very heart of autonomous driving. This article describes the SigmaFusion approach, developed by the LETI Technology Research Institute.

Selection of a safe processing platform

Of course, to fulfil the demands of software within a safety critical system a processing platform with pedigree in the field of automotive is also required. Here the best in class Aurix microcontrollers from Infineon, with their advanced signal processing capabilities, lockstep cores, and automotive interfaces, form an ideal basis, both in an ADAS stand-alone system or in a companion role to an automated driving AI platform. As a result, it was selected as the basis for a new demonstrator that embeds a range of sensors into the plastic bumper of a vehicle to display how multi-sensor fusion can be implemented, and how the SigmaFusion software in combination with Aurix presents the results.

The demonstrator draws upon a range of sensing solutions. A 77 GHz radar is based upon the RXS8160, a mmWave MMIC transceiver featuring a programmable waveform generator with fast chirp modulation. This is coupled with the radar processor out of the scalable Aurix family, TC397XA, which includes most advanced hardware signal processing units (SPU) enabling highest radar processing performance in a single chip, providing 4 MB of on-chip SRAM to store the radar image. It connects to the radar sensor via a high-speed LVDS radar sensor interface (RIF) that can operate at up to 3.2 Gbps. Connectivity to other systems within the vehicle is implemented via the TLE9251V CAN-FD transceiver. This includes robust wake-up pattern (WUP) detection, supporting worldwide wake-up filter timing, and is approved for use without external ESD protection. The complete radar module is supplied by a single OPTIREG PMIC TLF30682.

At the core of the demonstrator is a further member of the scalable Aurix safety microcontroller family, the TC397XX. This contains 4 lockstep and 2 non-lockstep cores operating at up to 300 MHz, providing the latest connectivity options via gigabit Ethernet, FlexRay, CAN-FD and LIN. Ensuring the power is optimally supplied to the solution, the board includes an OPTIREG PMIC TLF30682. This device requires a minimal number of support components, resulting in a space-saving power solution that includes integrated monitoring and supervision functions. The system is complimented with further commercial off-the-shelf (COTS) sensors, such as a LiDAR solution and camera, which also feed into the SigmaFusion software (Figure 2).

Figure 2: The SigmaFusion demonstrator for CES 2019,
based upon an Aurix safety controller.

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