600kHZ broadband acoustics doppler current profiler and realization method

Abstract

The invention discloses a 600kHZ broadband acoustics Doppler current profiler and a realization method, wherein the current profiler comprises an emission module, a reception module, a data storage module, a display-and-control computer, a sensor module, a power supply module, and a main and secondary processor that are interconnected. According to the broadband acoustics Doppler current profiler BBADCP provided in the invention, a sinusoidal signal coded by M sequence is used as the emission signal, therefore a higher distance-speed precision, a long detection distance and a short speed average time are provided; a frequency measurement method that combines multiple correlation frequency measurement and delay frequency measurement is employed, therefore the high precision of correlation frequency measurement is provided, and the problem of speed fuzzy of correlation frequency measurement is solved; the acoustic velocity is calculated at real time based on data like temperature and pressure, and the acoustic velocity is compensated at real time, therefore the flow measurement precision is improved.

Description

technical field [0001] The invention belongs to the technical field of deep-sea detection, and relates to a Doppler current profiler for measuring ocean current velocity, in particular to a 600kHZ wideband acoustic Doppler current profiler and a realization method thereof. Background technique [0002] The sea current meter is a traditional ocean current velocity measurement instrument. However, its shortcomings in a wide range of applications are also obvious, that is, the current meter is generally contact-type and can only measure the ocean current velocity at the installation position. Therefore, the sea current meter is used It takes a lot of time and effort to measure the velocity of seawater in a sea area. The Doppler Velocity Profiler ADCP is a velocity measurement sonar instrument based on the Doppler effect principle to measure the carrier relative to the bottom / flow. Because it does not produce any disturbance to the seawater flow field, there is no mechanical ine...

AI Technical Summary

Problems solved by technology

The limitations of NBADCP are as follows: firstly, the accuracy of a single measurement value is not high, in order to achieve higher measurement accuracy, it is necessary to perform an average calculation after multiple measurements over a long period of time; secondly, the layer thickness of the NBADCP depth unit should be selected larger Otherwise, the variance of velocity estimation at this depth is too large and inaccurate; finally, NBADCP does not have the ability to observe changes in small-scale ocean currents in a short period of time, and its scope of use is limited, so it cannot be widely used

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