The disclosed micromechanical gyroscopes all use the concept of sensing angular velocity with vibrating objects. Micromechanical gyroscopes that use vibration to induce and detect Coriolis forces have no rotating parts, do not require bearings, and have been shown to be mass-produced using micromachining techniques.
Important parameters of the MEMS gyroscope include: resolution, zero angular velocity output (zero output), sensitivity and measurement range. These parameters are important indicators for judging the performance of MEMS gyroscopes, and also determine the application environment of the gyroscope.
Resolution refers to the minimum angular velocity that the gyroscope can detect. This parameter and the zero angular velocity output are actually determined by the white noise of the gyroscope. These three parameters mainly explain the internal performance and anti-interference ability of the gyroscope. For the user, sensitivity is more practical. The measurement range is the maximum angular velocity that the gyroscope can measure. Different applications have different requirements for various performance indicators of the gyroscope.The ER-MG2-300/400 is a high-precision navigation MEMS gyroscope with a measurement range of 400 degrees/second and bias instability of 0.01°/ hour. Designed for precision attitude and bearing measurement, positioning, navigation, guidance in high-performance IMU/AHRS/GNSS assisted INS, aerial/Marine/land mapping/surveying systems/UAVS/AUVs and navigation-grade MEMS weapon systems.
Zero deviation refers to the output of the gyroscope in the zero input state, which is expressed by the mean value of the output for a long time, which is equivalent to the input angular rate, that is, the degree of dispersion of the observed value around the zero deviation, such as 0.005 degree/sec means that it will drift 0.005 degree per second. The long-term steady-state output in the zero-input state is a stationary random process, that is, the steady-state output will ebb and flow around the mean (zero-bias), which is conventionally represented by the mean square error, which is defined as zero-bias stability. The initial zero bias error can be understood as a static error, which does not fluctuate with time and can be calibrated with software.The high performance north seeking MEMS gyroscope ER-MG2-50/100 has bias instability of 0.01-0.02°/hr and angular random walk of 0.0025-0.005°/√hr. Designed for north finding, pointing, initial alignment/gyroscope tools, mining/drilling equipment, weapons/UAV launch systems, satellite antennas, target tracking systems, etc.
Sensitivity (resolution) represents the increment of the minimum input angular rate that can be perceived at a specified input angular rate, for example: 0.05 degree/sec/LSB. In general, the greater the measuring range of a MEMS gyroscope, the sensitivity will decrease accordingly.
The scale factor (scaling factor) is the ratio of the gyroscope output to the input angular rate. This ratio is expressed as the slope of a specific line, which is obtained by fitting the input and output data measured over the entire range of input angular rates using the least square method.
The nonlinearity is the ratio of the maximum deviation of the gyroscope output relative to the line fitted by the least square method in the range of the input angular rate to the maximum output, which represents the deviation degree of the actual input and output data of the gyroscope and determines the reliability of the fitted data. The linear acceleration sensitivity reflects the gyroscope's sensitivity to acceleration, and the unit is degree/sec/g.
Bandwidth refers to the frequency range in which the gyroscope can accurately measure the input angular rate, and the larger the range, the stronger the dynamic response capability of the gyroscope.
These parameters are important indicators to judge the performance of MEMS gyroscopes, and also determine the application environment of gyroscopes.
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More Technical Questions
1.How to select MEMS gyroscope?
2.How accurate is MEMS gyroscope?
3.Where are MEMS Gyroscopes Used?
5.MEMS gyroscopes, accelerometers and magnetometers
6.How do MEMS gyroscopes work?
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