Integrated inertial measurement unit stabilises autonomous vehicle robots

The IMU330RA is an integrated inertial measurement unit (IMU) developed by Aceinna. It has high accuracy and low latency characteristics, delivering one degree per hour bias instability and 0.1 degrees per square root angular random walk. As such it provide localisation and safety for autonomous vehicles, self-driving taxis and delivery vehicles and advanced driver assistance systems (ADAS), said the company.

The IMU330RA is a six DoF (degrees of freedom) inertial sensor packaged in a ruggedised, sealed over-moulded plastic housing, sealed to IP69K level. It features a redundant three-axis accelerometer and three-axis rate gyroscope sensors for accuracy and reliability, said Aceinna. 

The module supports both 1000Base-T1 automotive Ethernet and CAN-FD interfaces and provides up to 1000Hz update rate with low latency. The IMU330RA is an automotive grade, ASIL B-certified device which serves as the basis for customer positioning system integration to ASIL D, advised Aceinna.

It is designed for use in Automotive Level 3 and higher ADAS, confirmed Teoman Ustun, vice president of Aceinna’s automotive business unit. “This new sensor module provides encrypted data, at up to 1000Hz output rate over both Ethernet and CAN-FD interfaces, and supports precise synchronisation based on gPTP 802.1AS:2020 and unified diagnostic services.”

The operating temperature range is -40 to +105 degrees C. The IMU benefits from encrypted software updates and communication, with an on board hardware security module (HSM).

IMUs work together with a variety of perception sensors (for example, lidar, cameras, radar, odometry) to ensure that a vehicle stays on the correct path. If, however, the perception sensors fail because of location or environmental challenges (such as heavy rain, snow, dust, or smoke) the IMU can keep the vehicle on its projected path until data from the perception sensors re-engages or the vehicle is safely brought to a stop.

Aceinna is headquartered in Tewksbury, Massachusetts, USA. The company provides edge MEMS-based sensing solutions designed to help customers improve the reliability, cost, features and performance of end products and equipment. 

The company has manufacturing facilities in Wuxi, China, and R & D facilities in San Jose California, Andover Massachusetts and Chicago Illinois, USA.

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