ACEINNA announces new open-source inertial measurement unit

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ACEINNA Inc has launched the OpenIMU335RI, a rugged inertial measurement unit (IMU) with CAN and RS232 interfaces. The OpenIMU335RI is the third product in ACEINNA’s Gen 3 architecture and adds a rugged, sealed, standalone product to the earlier IMU383ZA and OpenIMU330BI.

The new IMU delivers increased performance in key acceleration and gyro specifications, including 1.3 degrees per hour bias instability (BI) and 0.1 degrees per root hour angle random walk, making it ideal for 3D machine guidance, 3D machine control and other applications requiring high-performance inertial measurements.

The product is also triple redundant – consisting of three independent three-axis accelerometers and three-axis gyros. This redundancy, common to ACEINNA’s Gen 3 products, provides increased performance in key acceleration and rate sensor characteristics, and increased reliability and equipment uptime in the field. ACEINNA says it has implemented a proprietary algorithm that detects a failing sensor and automatically and seamlessly eliminates it from the solution, allowing equipment to continue normal operation using the remaining sensors.

Packaged in a rugged sealed housing with an Ampseal 16 six-position connector, OpenIMU335RI includes CAN J1939 and RS232 interfaces for network connectivity. The miniature housing is formed using an overmolding process delivering a completely sealed solution that prevents any possible water ingress and is durable under tough environmental conditions. It is specified to work from an unregulated 9-32V supply and is fully qualified for use in 12V and 24V vehicle systems. A 3D magnetic field sensor is available as an option for applications requiring 9-DOF IMUs.

The OpenIMU335RI uses a powerful ARM M4 CPU with a floating point unit. The OpenIMU335RI module runs the OpenIMU open-source stack that includes an optimized full-state Kalman filter for attitude and GPS-aided position-velocity-time (PVT) measurement. For developers, the open-source environment allows for algorithm optimization for specific vehicle or application dynamics and custom messaging. A free development toolchain based on Microsoft VS Code supports PC, Mac and Ubuntu. Datalogging and visualization are supported with ACEINNA Navigation Studio, a free web-based graphical user interface.

“This new IMU adds to ACEINNA’s successful line of 6- and 9-DOF IMUs and provides even higher performance for designs that need it,” said Michael DiGangi, executive VP of ACEINNA. “It is the same size and has the same electrical interface as our popular OpenIMU300RI and MTLT305D sensors, giving existing customers an upgrade path to higher performance without redesign.”

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