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Method and software for Doppler three-dimensional data processing

A data processing software, Doppler three-dimensional technology, applied in the direction of re-radiation, complex mathematical operations, re-radiation of sound waves, etc., can solve problems such as over-processing, phase space method detection accuracy decline, and elimination

Active Publication Date: 2019-12-27
SHANGHAI OCEAN UNIV
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  • Claims
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AI Technical Summary

Problems solved by technology

[0006] The main disadvantage of the phase space method is the phenomenon of overprocessing, that is, due to the discretization, some valid data points near the outliers may be wrongly marked as outliers and thus eliminated
In addition, some scholars pointed out that the phase space method is suitable for laboratory water flow data with less wild point content, and when the wild point content exceeds 6.7%, the detection accuracy of the phase space method decreases
[0007] The existence of extreme value wild points in the robust estimation method will affect the average and MAD parameters so that its detection threshold is affected by extreme value wild points
When there are outliers with a large difference from the real value, the mean value and MAD are affected by the outliers, and the estimated positioning value is shifted to the outliers and away from the real data, and the estimated scale value increases, causing some outliers to be regarded as real data instead of real data. detected
[0008] In addition, the above two methods are only suitable for the detection of single-dimensional flow velocity data. Generally, the flow velocity measured by the flow meter contains velocity components in three directions, and the three-dimensional data are orthogonal to each other. If any dimension data is affected, it should be associated with it. The other two sets of data are deleted

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  • Method and software for Doppler three-dimensional data processing

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Embodiment Construction

[0049] In one embodiment of the present invention, a method for processing Doppler three-dimensional data is provided, comprising the following steps:

[0050] (1) Use R language to open the software for Doppler three-dimensional data processing, set the data path to be detected, set the window width, select the data output mode and output path, and run the software;

[0051] (2) The software reads the data to be detected, and detects the median of the data. When the number of data is odd, the median is the number in the middle of the data. When the number of data is even, the median is the number in the middle of the data. the average of the numbers;

[0052] (3) Sort the data and subtract it from the calculated median, take the absolute value of the data after subtraction, and re-sort from small to large, and perform median detection on the new data after sorting, specifically according to the following formula Find the median absolute deviation:

[0053] S=1.483 (median ...

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Abstract

The invention provides a method and software for Doppler three-dimensional data processing. The method for three-dimensional data processing includes the following steps that (1) the data is subjectedto primary filtering by using a robust estimation method; (2) culling outliers are subjected to interpolation by using a cubic spline interpolation method; (3) a three-dimensional phase space methodis used for performing secondary filtering on the data; and (4) the cubic spline interpolation method is used for performing interpolation on the culled outliers. The software for Doppler three-dimensional data processing includes a median calculation module, a robust middle window module, an outlier assignment module, a non-outlier assignment module, a derivative calculation module, a phase spacecalculation module and an operation module. By optimizing a optimal coupling robust estimation method and the three-dimensional phase space method, the method and the software can perform three-dimensional co-measurement and are suitable for data with high outlier content, and the method and the software can be used in fluid dynamics experiments while avoiding the iteration and reduction of over-processing phenomenon and improving the detection accuracy of the outliers.

Description

technical field [0001] The invention relates to a data processing software, in particular to a Doppler three-dimensional data processing method and software. Background technique [0002] Acoustic Doppler current meter is a remote sensing three-dimensional velocity sensor, which can measure instantaneous velocity in three-dimensional space. Due to its wide range, fast response, convenient and easy operation, etc., it is widely used in various laboratories or oceans and lakes. and other field hydrological experiments. Acoustic Doppler current meters and other flow velocity measurement devices based on the acoustic Doppler frequency shift effect are affected by Doppler noise, and outliers (outliers) will be generated during data recording. The principle of Doppler frequency shift is that sound waves undergo a phase shift proportional to the velocity of the object after bouncing off a moving object. This phase shift can only be measured in the range +180° to -180°, any shift ...

Claims

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Application Information

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IPC IPC(8): G01S15/58G01S7/52G01S7/537G01P5/24G01P1/00G06F17/18
CPCG01P1/00G01P5/241G01S7/52001G01S7/537G01S15/58G06F17/18
Inventor 张俊波钟纯怿程懿麒万荣童剑锋郭绍健
Owner SHANGHAI OCEAN UNIV
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