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,and the extended uncertainty of this test system is evaluated as U=0.071 m/s,k=2.
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