3results about How to "Accurate Data Reference" patented technology

This invention provides a converter impedance measurement method that overcomes the influence of nonlinearity. By injecting voltage disturbance signals of different frequencies and amplitudes multiple times, the impedance is determined based on the voltage and current responses of the voltage disturbance signals. The method also takes into account the voltage and current responses caused by circuit disturbances, which can effectively avoid the influence of nonlinear behavior in the process of determining the impedance group of the converter under test, ensure the final measurement accuracy, and provide accurate data reference for subsequent impedance stability analysis and the formulation of impedance stabilization strategies.

The invention provides a base wine body density prediction method and device, equipment and a medium. The base wine body density prediction method comprises the steps that multi-modal sensing data influencing base wine body density changes are obtained; sequentially carrying out data preprocessing and feature engineering processing on the multi-modal sensing data to obtain multi-modal sensing features; constructing a deep learning model integrated with physical information constraints on the basis of the multi-modal sensing features; training the deep learning model through a total loss function to obtain a base wine body density prediction model; and inputting to-be-predicted data into the base wine body density prediction model to obtain target base wine body density prediction data. Compared with the prior art, non-contact, automatic and high-precision dynamic tracking and prediction of the wine body density of the base wine are achieved.

The invention relates to an underwater sound vertical line array element sensitivity in-situ calibration method based on a high-precision synchronous clock. According to the invention, the non-directional sound source and the standard hydrophone are combined to realize real-time calibration of the sound source level of the non-directional sound source; through the design of LFM signal emission, the anti-interference capability of signals and the multi-frequency-point sensitivity measurement of the underwater acoustic vertical linear array are improved. Time is synchronized by using a high-precision synchronous clock, and time interval data of the non-directional sound source and the underwater sound vertical line array are accurately measured; and calculating the sensitivity of each array element by using the sound source level data of each frequency point, the open-circuit voltage of each frequency point, the average sound velocity and the time interval data so as to realize in-situ calibration. According to the invention, the sound source level of the non-directional sound source is calibrated in real time, and the sensitivity in-situ calibration of the underwater sound vertical line array is realized by combining the time reference provided by the high-precision synchronous clock. The sea test experiment provides a specific embodiment for the in-situ calibration of the underwater sound vertical line array, and the result meets the uncertainty requirement.