声学多普勒流速剖面仪计量测试系统设计

Design of Acoustic Doppler Current Profiler Calibration System

为实现声学多普勒流速剖面仪(简称ADCP)流速量值的溯源与传递,提出了一种以深水航道和无人船为技术平台的ADCP流速计量测试方法。通过无人船搭载ADCP沿规划航线匀速运动,采用高速摄像机和全站仪作为时间和长度测量的主标准器,计量ADCP在测量段内的平均速度,作为流速参考标准值,与ADCP流速示值比较,计算不同流速示值误差。采用实时差分动态定位技术(简称GPS-RTK)测绘无人船运动轨迹和偏航误差,核查无人船的瞬时速度稳定性。试验结果表明,在无人船设定航速1 m/s的条件下,被检ADCP流速示值误差为-0.029 m/s,建立数学模型,评定测试系统的扩展不确定度U=0.071 m/s,k=2。

In order to trace and transmit the velocity value of acoustic Doppler current profiler(ADCP),an ADCP velocity measurement method based on deep water channel and unmanned ship is proposed.An unmanned ship carrying ADCP moves at a uniform speed along the planned route.High-speed camera and total station are used as the main standard for time and length measurement.The average velocity of ADCP in the measurement section is measured as a reference value for velocity.Compared with ADCP velocity indication,the error of velocity indication is calculated.Real-time kinematic positioning technology(GPS-RTK)is used to map the trajectory and yaw error of unmanned ship and verify the instantaneous velocity stability.The test results show that,under the condition of unmanned ship setting speed of 1 m/s,the error of ADCP velocity indicated by inspection is -0.029 m/s,building mathematical model,the extended uncertainty of this test system is evaluated as U=0.071 m/s,k=2.