With the expansion of ADAS and autonomous driving, radar sensors are becoming a key technology for current and future radar applications to sense the car’s surrounding, alerting the driver, and intervening with adequate measures when needed. Radar sensing is considered as an essential pillar leading the path to autonomous driving due to increasing numbers of emerging features, such as adaptive cruise control, advanced emergency braking systems, blind spot warning and cross traffic alert.
Cross Traffic Alert
Blind Spot Warning
Adding those features will help the driver in having a safer and more comfortable journey. With increased market acceptance for driver assistance systems and autonomous drive evolving, car manufacturers are seeking to provide these features to differentiate their cars by enabling future driver assistance functions or gain higher ratings in public programmes such as the New Car Assessment Programs. The requirements for radar sensors in terms of range resolution, separation of objects and precision in measurement of velocity are also evolving.
In comparison to other sensor systems such as camera, ultrasound or LIDAR, radar sensors have some decisive advantages: radar sensors can measure precisely distances, speed and angels and easily detect multiple targets, e.g. vehicles, or persons, and track their movement. While optical systems, such as infrared, LIDAR or camera, rely on good viewing conditions, radar sensors are more or less unaffected by poor visibility conditions. Radar sensors use electromagnetic waves to detect objects - almost unrestrained by darkness, rain, snow, fog or dirt. Also fast changing light conditions, e.g. when traveling through a tunnel, are not an obstacle for radar systems. Moreover it is possible to mount radar sensors behind EM-transparent material such as bumpers or holographic car logos. Furthermore radar sensors can be used for a wide range of ADAS applications and Autonomous Drive.
Renesas Radar Offer
Renesas offers the RH850/V1R-M series a dedicated controller family, optimized for radar applications. RH850/V1R-M consists of 32-bit single-chip microcontroller with multiple CPUs, Code Flash, Data Flash, RAM, DMA controllers, many communication interfaces that are used in the automotive applications (CAN FD, Flexray, Ethernet, MIPI CSI2), A/D converters, timer units, etc. For the Radar function it incorporates a DSP toolkit (DSPSS) with additional RAM and has a high speed differential interface. This chip is compliant with the functional safety standard required in the automotive applications (ISO26262).
High-Performance DSP With Flexible Programmability for Improved Radar Signal Processing Performance and Increased Sensing Accuracy4>
The RH850/V1R-M MCU is designed to have optimized hardware acceleration in the DSP. The optimized DSP allows the system developers to process the raw data into target objects efficiently, separately from the safety relevant classification and tracking done in the CPUs. Renesas’ high performance DSP performs radar specific algorithms such as fast fourier transforms (FFTs), beamforming, windowing, channel calibration, peak search, at high speed and with low power consumption. The DSP offers high flexible programmability and Renesas specifically developed a DSP math library for automotive radar sensors to support system developers in their algorithm development.
Renesas Low-Power Technology and Embedded Flash for more Compact and Low-Cost Radar Sensors
The RH850/V1R-M is developed using Renesas’ world leading 40 nm embedded flash (eFlash) process technology, which has a proven track record in terms of re-write cycles, the industry’s fastest random access operation speeds and high reliability. It also has the merit of low power consumption as the transistors are smaller lowering parasitic capacitances. The process specification of RH850/V1R-M also fulfills the highest temperature requirements in the industry (T-junction 150°C). The embedded flash brings advantage to the system designer by offering higher integration using less PCB space and better real time behavior.
Dual core at 320MHz high performance, integrated 2MB large capacity RAM, 2MB highest speed flash and highest temperature requirements
The new RH850/V1R-M features two G3MH CPU cores operating at 320 MHz and are the highest performance cores among the RH850 Family. The G3MH is a superscalar RISC architecture with two 7-stage integer pipelines, which allows execution of two different instructions at the same time. Each G3MH core achieves the performance of 3.2 DMIPS/MHz. The RH850/V1R-M also includes 2MB industry-highest speed flash based on Renesas automotive 40nm embedded flash technology. By incorporating a large 2MB capacity RAM, the RH850/V1R-M handles all specific calculations on radar cube data such as range and velocity FFTs, digital beam forming, constant false alarm rate (CFAR) and peak detection.
A flexible programmable complete toolchain with C/C++ compiler, debugger, simulation models and detailed performance profiling tools will also be available.
Renesas also offers an evaluation board for the RH850/V1R-M equipped with all the necessary interfaces such as MIPI CSI2 and Aurora.