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In the marine environment, the underwater images have low SNR and the detail is fuzzy due to scattering and absorption of a variety of suspended matter in it and the water itself. If traditional methods are used to dispose underwater images directly, it is unlikely to obtain satisfactory results. Through the further research on traditional fuzzy c-means clustering algorithm, an adaptive FCM segmentation...
The load torque disturbance influences the performance of permanent magnet synchronous motor speed control. Therefore, to compensate this problem, this paper designed a model reference torque observer based on Popov-super-stability theory. This observer uses off-line calculation to obtain the model parameters and PI calculation of the speed model error to get the load torque. This structure is simple...
A bulk micromachined gyroscope fabricated with an improved process flow is measured systematically. It achieves good performance at atmosphere. The driving resonant frequency is 1663.5Hz with a quality factor 195, and the sensing resonant frequency is 1677Hz with a quality factor 200. The R2-nonlinearity is 0.008% within the range of ±43°/s, which is limited by the digital to analogue converter, with...
We analyze the effects of possible noise sources on a fence structure micromachined capacitive accelerometer system by modeling and simulation to improve its performance. Simulation results show that a mismatch between the two initial sensing capacitors of the accelerometer or a mismatch between the two capacitance-voltage conversion circuits has a great effect on the output noise floor. When there...
The point spread function (PSF) of the turbulence degrading system, as well as the variance of the observation noise and the model of the original image, are unknown a priori in practical imaging processes when the aero-optic effect exists. Both of the PSF and the variance of the observation noise have to be identified from the turbulence degraded images before restoring them. An approach of identification...
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