Design Method of On-chip Phase Compensator for Vibration Sensors Based on QPSO
The system phase of vibration sensors has the characteristic of inconsistency,resulting in significant errors in the ex-traction of time differences of seismic waves,which severely affects the localization accuracy of earthquake source.To address this is-sue,an on-chip phase compensator method for vibration sensors based on quantum particle swarm optimization(QPSO)algorithm is proposed.Firstly,the vibration sensors are calibrated the phase to obtain the phase difference between the sensor and the reference sensor.Then,a phase compensating filter based on QPSO algorithm is designed to correct the phase difference infinitely close to zero.Finally,the phase compensating filter is implemented as an FPGA soft core,and it is deployed on FPGA to achieve the real-time on-chip phase compensation for the vibration sensors.To verify the performance of this method,the phase compensating filter is de-ployed on a self-developed multi-channel vibration signal acquisition system,and the phase consistency calibration of 8 identical vibra-tion sensors is implemented.Experimental results show that within the frequency response range of the vibration sensors,the pro-posed method can real-time correct the sensor phase difference within 2.5° to below 0.004 4°,achieving the real-time phase consisten-cy calibration of the vibration sensor array,and it has a strong application value in the field of shallow earthquake source localization.
万方数据
维普
