In these areas, the GNSS signal is blocked off for a short time and is therefore no longer available for position determination. With the help of the new high-precision ASC 281 (uniaxial) and 283 (triaxial) MEMS rotation rate sensors, vehicle navigation can be supported temporarily until the GNSS signal is restored. The ASC 281/283 gyroscope is a further development of the proven ASC 271 and 273 sensors, which have been used for years with great success for vehicle comfort and drive dynamics tests in various industrial sectors. The new ASC 281/283 rotation rate sensor has increased the already high bias stability of the ASC 271/273 by a factor of 75 (from 9.0°/h to 0.12°/h) and further reduced the angular random walk (from 0.2 °/√h to 0.017°/√h). Thanks to this high precision, the sensors meet particularly high requirements (Tactical Grade) in terms of the maximum achievable accuracy, which otherwise can only be achieved by fiber optic gyroscopes (FOG).
The new ASC 281/283 rotation rate sensor keeps vehicles on course in the event of a failure of the GNSS signal.
At the heart of the rotation rate sensors are sensor elements based on robust MEMS vibration ring elements providing a measurement range of ±100°/s or ±200°/s. Due to the design of the micromechanical silicon structures and the integration into reliable aluminum housings with protection class IP67, both the ASC 281 and the ASC 283 are extremely insensitive to external shocks and vibrations. They are therefore ideal for use in harsh environments.
The excellent temperature stability and long-term stability of the bias and the scaling factor allow very precise and reproducible measurements of angular velocity in numerous applications. In addition to use in trains and self-driving or remote-controlled vehicles, AHRS (Attitude Heading Reference System), platform stabilization and ships guidance by means of gyrocompass are possible application examples.
Source: ASC GmbH, www.asc-sensors.com