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Inverse distance weighted grid method for constructing sea area plumb line deviation model based on frequency domain characteristics

A technology of inverse distance weighting and vertical line deviation, applied in the field of inverse distance weighting grid method, can solve the problems of not taking into account the spectral characteristics of ocean vertical line deviation and low interpolation accuracy

Inactive Publication Date: 2020-07-28
THE CHINESE PEOPLES LIBERATION ARMY 92859 TROOPS
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Problems solved by technology

However, the inverse distance weighted interpolation algorithm only considers the spatial attributes between the estimated point and the observation point, and does not take into account the spectral characteristics of the ocean vertical deviation, resulting in low interpolation accuracy of the algorithm

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  • Inverse distance weighted grid method for constructing sea area plumb line deviation model based on frequency domain characteristics
  • Inverse distance weighted grid method for constructing sea area plumb line deviation model based on frequency domain characteristics
  • Inverse distance weighted grid method for constructing sea area plumb line deviation model based on frequency domain characteristics

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Embodiment Construction

[0033] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0034] An inverse distance weighted grid method for constructing a sea area vertical line deviation model based on frequency domain characteristics, comprising the following steps:

[0035] Step 1. Using the mid- and long-wave spectrum information provided by the global gravity field model, remove the vertical deviation from the ocean vertical deviation observations, and calculate the residual vertical deviation at the observation point.

[0036] The residual vertical line deviation at the observation point includes the residual error δξ of the meridian component of the vertical line deviation at the observation point i i Residual error δη with Maoyou component i , whose calculation formula is:

[0037]

[0038] In the formula, ξ i and η i is the actual measured value of the meridian component and the unitary component of the vertical line deviation at...

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Abstract

The invention relates to an inverse distance weighted grid method for constructing a sea area plumb line deviation model based on frequency domain characteristics, which comprises the following stepsof removing plumb line deviation in a sea plumb line deviation observation value by utilizing medium-long wave frequency spectrum information provided by a global gravity field model, and calculatingto obtain residual plumb line deviation at an observation point; on the basis of the residual vertical line deviation at the observation point, calculating to obtain the residual vertical line deviation at the to-be-estimated point by applying an inverse distance weighted interpolation algorithm; and recovering the model value of the residual error of the meridian component and the mortise unitarycomponent of the vertical line deviation of the to-be-estimated point, and calculating to obtain the vertical line deviation value at the to-be-estimated point. The method is reasonable in design, the ocean plumb line deviation observed value serves as basic data, the global gravity field spherical harmonic model is combined, the inverse distance weighted interpolation method based on the frequency domain characteristics is adopted, the high-precision and high-resolution sea area plumb line deviation model is constructed, and the method can be widely applied to the field of ocean surveying and mapping.

Description

technical field [0001] The invention belongs to the field of marine surveying and mapping, in particular to an inverse distance weighted grid method for constructing a vertical line deviation model in a sea area based on frequency domain characteristics. Background technique [0002] The vertical deviation of the sea area is an important part of the ocean gravity field information, and it is also the basic information necessary to ensure the precise navigation and positioning of the inertial navigation system. The time cost and economic cost of sea-air gravity measurement are very high, and it is impossible to quickly and economically obtain the gravity information that meets the resolution requirements of the inertial navigation system for precise navigation and positioning. It is of great scientific significance to seek a high-precision interpolation algorithm for the construction of the ocean vertical deviation model and application value. [0003] The inverse distance w...

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Application Information

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IPC IPC(8): G06F30/20G01C13/00G06F111/10G06F119/14
CPCG01C13/00
Inventor 邓凯亮陈欣吴太旗黄贤源范龙徐广袖李凯峰
Owner THE CHINESE PEOPLES LIBERATION ARMY 92859 TROOPS
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