Deep sea reference network adjustment method based on semi-parameter estimation and additional depth constraint

A semi-parametric, network adjustment technology, applied in the field of deep-sea benchmark network adjustment, can solve problems such as the influence of parameter estimates and erroneous conclusions, and achieve the effect of weakening the influence of the sound velocity system error and improving the estimation accuracy.

Active Publication Date: 2021-12-21
SHANDONG UNIV
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Problems solved by technology

When laying out the submarine reference network, the overall adjustment of the reference network can improve the calibration efficiency of the reference point, but the conventional method of seabed reference network adjustment only considers the influen...

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  • Deep sea reference network adjustment method based on semi-parameter estimation and additional depth constraint
  • Deep sea reference network adjustment method based on semi-parameter estimation and additional depth constraint
  • Deep sea reference network adjustment method based on semi-parameter estimation and additional depth constraint

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[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0028] see Figure 1~2 , in an embodiment of the present invention, the deep-sea reference network adjustment method based on semi-parametric estimation and additional depth constraints includes the following steps:

[0029] Step 1, data preparation and preprocessing;

[0030] Set each reference point as the main point in turn, measure the distance information of multiple epochs between each reference point, and obtain the sound velocity profile of the sea ar...

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Abstract

The invention relates to the field of ocean exploration, in particular to a deep sea reference network adjustment method based on semi-parameter estimation and additional depth constraint, the method comprises the following steps: acquiring a sound velocity profile of a sea area site; transmitting an onshore datum to the seabed, and acquiring reference coordinates of other datum points by using a spatial intersection principle; acquiring pressure sensor data on the reference point as depth information; arranging and fusing the observation data; selecting a compensation least square method to construct a three-dimensional network adjustment model based on semi-parameter estimation and additional depth value constraint; solving an adjustment result according to the determined parameters, and performing precision evaluation; introducing a semi-parameter estimation theory, and proposing a three-dimensional network adjustment model based on semi-parameter estimation and additional depth value constraint; the actual measurement data of the deep sea reference network are used for verification, nonparametric components are introduced, the influence of sound velocity system errors is effectively weakened, depth value constraints are added, the estimation precision of the vertical direction of the deep sea reference network is improved, and the overall calibration result of the reference point is closer to the actual coordinate value.

Description

technical field [0001] The invention relates to the field of ocean exploration, in particular to a deep-sea reference network adjustment method based on semi-parametric estimation and additional depth constraints. Background technique [0002] As part of the PNT (Positioning, Navigation, Timing) system, the submarine reference network can provide high-precision navigation and location services for military defense, scientific investigation, resource development, maritime rescue, etc., and is an important infrastructure for exploring the ocean. When laying out the submarine reference network, the overall adjustment of the reference network can improve the efficiency of datum point calibration, but the conventional method of submarine reference network adjustment only considers the influence of accidental errors in the underwater acoustic ranging observations. However, in actual situations, if the influence of system (model) errors is not considered, the adjustment will have a...

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Application Information

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IPC IPC(8): G01C13/00G01C5/00G06F30/20
CPCG01C13/00G01C13/008G01C5/00G06F30/20Y02A90/10
Inventor 徐天河禹小康江楠王君婷
Owner SHANDONG UNIV
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