Study of an expendable current profiler detection method

In this study, the induced electric field model for current movement is established, and the measurement principle of an expendable current profiler (XCP) is obtained through model analysis. Based on this analysis, a method is proposed for the measurement of the nanovolt-scale ocean-current-induced electric field. The proposed procedure moves the frequency of the ocean-current-induced electric field signal to the super-low noise range of the ocean current electric field sensor though amplitude modulation. This is then followed by amplifier filter extraction, while compensating the ocean-current-induced electric field, in terms of the circuit, to offset the strong interference of the induced electric field caused by the subsidence of the XCP probe. Inside the XCP probe, the ocean current electric field signal and the compass coil signal are converted into the in-phase component In, quadrature component Qn, and baseline component Bn, and the data processing method that calculates the eastward and northward relative velocity components of the ocean current from the values of In, Qn, and Bn is established.

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