TDK has developed a high-stability and vibration-tolerant digital MEMS gyroscope for dynamic applications including uncrewed systems (writes Nick Flaherty). The Tronics GYPRO 4300 has a ±300 o/s input measurement range, 200 Hz bandwidth and 1 ms latency with a closed-loop architecture to deliver high linearity and stability in dynamic environments. This is the first in a series of devices using the architecture and can be used with a closed-loop digital accelerometer platform called the AXO300 for an IMU. The architecture gives a typical bias stability of 0.5 o/h (2 o/h maximum) and an ARW (angular randomwalk) of 0.1 o/√h. The closed-loop architecture also provides a vibration rejection of 0.5 o/h/g² under harsh conditions. TheMEMS sensor is housed in a miniature, hermetically sealed ceramic J-lead package. The package includes fully hard-coded electronics with a 24-bit digital SPI interface for integration into inertial navigation systems and IMUs as well as attitude and heading reference systems. Tominimisemechanical cross-coupling in multi-axis applications, the GYPRO 4300 is available in three frequency ranges. The solid-state architecture reduces the number of internal components and systemcomplexity. This gives an MTBF failure rate in excess of 1,000,000 hours, more than 10 times that of existing dynamically tuned gyros and fibre optic gyros with similar performances. Built-in self-testing also allows an initial verification of the sensor’s integrity and a continuous in-operation functionality test. The part measures 12 x 12 x 5 mm and has the same digital interface as TDK’s Tronics AXO300 digital accelerometer, which is also in a ceramic package. This provides easier connection between the two devices on a PCB, with the ceramic packages providing greater temperature stability than plastic packages. An Arduino-based evaluation kit provides built-in testing of functionalities such as output reading and recording, recalibration and digital self-tests. TDK plans to extend the GYPRO 4300 family with improved bias stability, lower ARW and lower in-band noise for precise attitude determination. Navigation RuggedMEMS gyro CONNECT TECHNOLOGY WITH CONFIDENCE / / WWW . H A R W I N . C O M Harwin UAV Uncrewed Systems March 23.indd 1 17/05/2023 14:56
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