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The research presented here aims to improve the sensory economy of an all-accelerometer inertial measurement unit (IMU). The authors will show that accelerometers are underutilised in this class of IMUs when they are attached to dynamically constrained systems. This scenario usually warrants one of two solutions; each being geared towards general unconstrained motion. In this paper, however, the authors...
Generalized complementary filter (GCF) is an attractive solution for data fusion in attitude and heading reference system (AHRS) and inertial measurement unit (IMU), mainly because its computational efficiency. However, since the accelerometer in AHRS and IMU is sensitive to both the gravity and external acceleration, the performance of GCF will be degraded under dynamic circumstances, just as other...
With the help of the 2nd-model the analysis of magnetic induction changes during the variation of the rotor's sensor angular speed was carried out, the system of differential equations was obtained defining electromagnetic processes in the sensor, the example of the system for solution of differential equations was given with the help of Matcad and the error analysis of permanent acceleration into...
This paper proposed a random chopper (RC) architecture for use in a capacitive accelerometer readout circuit. This technique randomizes low-frequency flicker noise to be more thermal-noise-like, and also boosts the small signal charges due to acceleration. The noise-equivalent acceleration (NEA) of the proposed RC readout circuit is greatly reduced compared with conventional correlated double sampling...
Of the sensors that quantify motion, accelerometers are commonly available at low cost due to their widespread use. Whether embedded in other products or used by itself, it is used to measure movements across a wide range of intensities and frequencies but for normal biological applications, the range of physical movements is not vigorous. Proper use of accelerometers requires understanding of their...
An acceleration sensor used to determine the vehicles speeds on the highways is developed. The sensor is able to measure the vibrational accelerations perpendicular (out-of-plane) to the asphalt surface as low as 1 mG. The sensor structure is validated with the engineering software packages: ANSYS, COVENTOR and Matlab.
When systemic rotation autocompensation technique is implemented in inertial navigation system (INS), inertial measurement unit (IMU) undergoes intentionally devised mechanical motions. This technique is one of the strategies of improving the system precision performance at the system level. A dual-axis continuous rotation scheme is introduced, and system error equation is derived. The behaviors of...
A closed-loop micro-accelerometer is presented where its instability regime is used in order to enhance its static gain. Sensitivity functions are increased in low frequencies and therefore any acceleration applied on the proof mass is better rejected than in conventional closed-loop approach. To design a robust controller, an identification procedure of the instable structure is presented as well...
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