A Method of Improving emd to Attenuate Multi-beam Residual Errors

A residual error and multi-beam technology, applied in the field of improving EMD to weaken multi-beam residual error, can solve the problems of complex calculation and unsatisfactory residual error effect, and achieve the effect of weakening multi-beam residual error and superior adaptability

Active Publication Date: 2022-03-29
江苏华瀚耀星海洋科技有限公司
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Problems solved by technology

Although the above methods can weaken the residual system error of multi-beams, there are still some problems, that is, the effect of weakening the residual error is not ideal, the calculation of the method is more complicated, and all the above methods use the polynomial fitting method to the edge beams. data correction

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Embodiment Construction

[0044] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0045] A method for improving EMD to weaken multi-beam residual errors, the process of which is as follows image 3 shown, including the following steps:

[0046] Step 1: use the minimum distance method to find the same Ping section of adjacent strips;

[0047] The central point of the acquisition beam of one of the strips is used as the base point, and the central point of the acquisition beam in the adjacent strip is found to make the shortest connection between the base point and the Ping section of the adjacent strips;

[0048] Step 2: Use the cubic Bessel interpolation method to re-interpolate the extreme points, specifically including the following steps:

[0049] Step 2.1: Filter extreme points;

[0050] Filter out the maximum value and minimum value in the original depth data, and mirror and extend the extreme point. Extend the two ext...

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Abstract

The invention discloses a method for improving EMD to weaken multi-beam residual errors, belonging to the technical field of marine resource detection, comprising the following steps: using the minimum distance method to find the same Ping section of adjacent strips; using the cubic Bessel interpolation method to Re-interpolate the extreme points; use the cubic Bessel interpolation method to perform empirical mode decomposition on the multi-beam water depth data to obtain the trend item and residual item of the seabed change; construct a new edge beam trend item; construct the overall seabed trend item; construct Seabed bathymetry strip data. The method of the present invention has universal characteristics, not only considering the superior adaptability of EMD, but also combining the accuracy of screening extreme points of the cubic Bessel interpolation method, and can better screen out the extreme value of the envelope, It is an effective method to reduce the multi-beam residual error.

Description

technical field [0001] The invention belongs to the technical field of marine resource detection, and in particular relates to a method for improving EMD and weakening multi-beam residual errors. Background technique [0002] The multi-beam sounding system is a full-coverage sonar sounding system. In addition to its own measurement errors, it is also affected by external factors, such as sound velocity changes, positioning, ship attitude, and transducer installation deviations. At present, domestic scholars have proposed corresponding improvement methods for the influence of the above errors. Ding Jisheng and others discussed the influence of sound velocity profile on multi-beam bathymetric data; The comprehensive correction method of time correction corrects the positioning error; Zhao Jianhu and others analyzed the influence of ship attitude on multi-beam data; Yang Fanlin and others discussed the influence of multi-beam instantaneous attitude position correction on water ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/527G01S7/536G01S15/88G01S15/08
CPCG01S7/527G01S7/536G01S15/08G01S15/88
Inventor 孙佳龙秦思远龙冰心郭淑艳张正阳秦江涛颜永豪王立泽
Owner 江苏华瀚耀星海洋科技有限公司
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