大地坐标系下ADCP流速流向校准系统设计OA

Acoustic Doppler current profiler(ADCP)is widely used in the measurement of current velocity profiles in rivers and oceans.The display and control software of imported ADCPs usually only outputs the combined velocity and direction in the geodetic coordinate system,and the velocity output accuracy in this coordinate system is affected by the static output jitter of the internal heading angle sensor.Based on this,a detail of the configuration parameters of ADCPs is conducted,and direction in the geodetic coordinate system is established.For the workhorse four-beam 600 kHz ADCP produced by RDI,a velocity and direction calibration system is designed using the acoustic simulation method.The focus is on discussing the frequency accuracy required by the system and the configuration method of the RDI ADCP for calibration using the acoustic simulation method.Calibration experiments are within the range of 0.2～5 m/s current velocity and 0～360° direction.The results show that by tracking and compensating for the heading angle jitter,the random error caused by the heading angle jitter can be reduced.This system can achieve the calibration of velocity and direction in the geodetic coordinate system,with a velocity measurement uncertainty less than(0.5%×simulated velocity value+0.005)m/s and a direction measurement uncertainty less than 0.8°.