MEMS IMU AIST-350

AIST-350 is a 6 DOF, fully factory calibrated inertial measurement unit ( IMU ) built with two 2-axis STM LPY-510 MEMS gyros (STMicroelectronics) and one 3-axis ADXL-326 MEMS (Analog Devices) accelerometer. The sensors inside the IMU are ovenized with a miniature and smart oven that keeps the temperature of the sensors stable with accuracy of 0.05C if the outside temperature change rate (measured on the mounting flange) is less than 2C/min. If the unit temperature is -40C while initial turn-on, the oven reaches its stable operating temperature in less than 3 minutes provided needed power supply is given. In order for the oven to operate properly, the outside temperature should not be more than +80C. 

To simplify the unit’ operation in integrated with GNSS inertial navigation systems, a PPS channel  that synchronizes the IMU data packets with the GNSS receiver PPS signal is implemented in the IMU AIST-350 as a standard feature.

Connection to the IMU is done via high-performance silicon wires of 1 meter total length, that keep its mechanical properties (including flexibility) over truely extensive temperature range of -50C to +100C. The wires end with a technological connector JST XHP-5(www.jst.com) that can be freely cut by the user. In case this connector is kept by the user, we provide the matching connector JST B6B-XH-A with each IMU. The IMU needs to be mounted on a flat surface and positioned accurately with 2 alignment pins (prease, refer to the installation quide). The unit is sealed and filled with drained gas with the dew point of -40C.

The unit is currently available in 2 modifications, i.e. with the 400 deg/sec gyroscopes measurement range (AIST-350-400) and with 100 deg/sec gyroscopes measurement range (AIST-350-100). The key features of the IMUs are (shown for AIST-350-400; for AIST-350-100 in parenthesis):

• Measurement range (gyroscope): 400 deg./sec (100 deg./sec)
• SF nonlinearity (gyroscope) (1σ): 0.1%
• In-run bias stability (gyroscope)(1σ, Allan variance): 15 deg./hour (12 deg./hour)
• Turn-on to turn-on bias stability (gyroscope) (1σ): 50 deg./hour
• ARW (gyroscope): 0.7 deg./√hour (0.5 deg./√hour)
• Measurement range (accelerometers): 16 g
• In-run bias stability (accelerometers) (1σ, Allan variance): 2 mg
• Power supply: 8..31 V 
• Power consumption of the IMU: 0.3 W
• Power consumption of the oven: 0.1*(85-T) W, where T is the outside temperature in deg C
• Quick warm-up: up to 20 W (programmable)
• Dimensions: Ø45x54 mm (Ø64x57 mm by the flange) 
• Weight: < 170 g

Due to the ovenized sensor chamber in the IMU, the above given technical specs are guaranteed on a whole operating temperature range, i.e. from -40C to +80C, and with applied random vibration of 5G RMS magnitude in 20-2000Hz spectrum. More detailed datasheet of the IMU in PDF can be downloaded below.