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Integrated system and method for precision measurement of ship dynamic draft

A precision measurement and integrated system technology, applied in radio wave measurement systems, measurement devices, and equipment to reduce ship motion, etc., can solve problems such as reducing the accuracy of marine surveys, and achieve the effects of easy installation, convenient operation, and fewer error influencing factors.

Active Publication Date: 2021-10-19
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Taking marine surveying as an example, during marine surveying, the draft value of the detection equipment on the ship is measured in advance before sailing, and the draft value is corrected to the observed value in post-processing to obtain the detection value of the surveying equipment based on the water surface, while the ship is sailing. The draft will change dynamically with the comprehensive influence of load, ship speed, course, current velocity, flow direction, wind force, wind direction, seawater density, water temperature, region, ship type and other factors. The dynamic change of ship draft will inevitably cause the draft change of the equipped marine detection equipment , if this value is ignored, it will directly reduce the accuracy of ocean survey

Method used

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  • Integrated system and method for precision measurement of ship dynamic draft
  • Integrated system and method for precision measurement of ship dynamic draft
  • Integrated system and method for precision measurement of ship dynamic draft

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Experimental program
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Embodiment 1

[0030] Appendix H of "Hydographic Surveying Code" GB12327-1998 stipulates two methods for measuring the dynamic draft of the transducer of the depth sounder; Appendix L of the "Code for Water Transport Engineering Survey" JTS131-2012 provides three kinds of corrections for the dynamic draft of the transducer of the depth sounder number measurement method. Both specifications discuss dynamic draft correction as a separate chapter, which shows the importance of dynamic draft correction.

[0031] Microwave belongs to electromagnetic wave and is a kind of mechanical wave. The speed in vacuum is equal to the speed of light, that is, v=3×10 8 m / s, the wavelength is between 0.001m and 0.1m, it is less affected by meteorological environment factors, has the advantages of non-contact, high precision, fast response, etc. It is widely used and the theory is mature, which is the technical basis of the distance measurement of the present invention. The microwave transmitting sensor sends...

Embodiment 2

[0043] The use process of the present invention is as follows: when the system of the present invention only comprises a single microwave transceiver, the microwave transceiver should be installed near the survey equipment, i.e. image 3 The 4# position. The ship is still floating on the water surface (before and after the calm tide), the system of the present invention collects the distance from the microwave ranging sensor to the water surface, sets the sampling frequency to 1 second, collects for 10 minutes, removes jump points, and calculates the average value as L1; the ship assumes Sailing at a constant speed of v1 in a specific water area, use the system of the present invention to collect the distance from the microwave ranging sensor to the water surface, set the sampling frequency to 1 second, collect for 10 minutes, remove jump points, and calculate the average value as L2; ​​calculate the difference △L=L1 -L2, △L is the dynamic draft value of the installation posit...

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Abstract

The invention relates to an integrated system and method for accurate measurement of ship dynamic draft, and belongs to the technical field of water survey operations. The invention includes a measuring device integrated on the peripheral support firmware of the ship's side, and a GNSS positioning device and a communication system installed on the ship; the measuring device is used to transmit microwave signals to the water surface, return signals through the water surface scattering, and survey the draft value of the ship Measurement, including microwave transceiver and peripheral support firmware; communication system, used to synchronize microwave ranging data and GNSS acquisition data into the electronic computer; GNSS positioning equipment, used for synchronous acquisition, transmission and recording of microwave ranging data in the electronic computer , Acquisition, recording, and ending are the same as the microwave ranging transmitter and receiver, and are all controlled by electronic computer instructions. The invention is easy to install, convenient to operate, less affected by the external environment, less error influencing factors, high in precision, operable in far and near seas, and strong in application expandability.

Description

technical field [0001] The invention relates to an integrated system and method for accurate measurement of ship dynamic draft, and belongs to the technical field of water survey operations. Background technique [0002] Draft generally refers to the depth of a ship submerged in water, that is, the vertical distance from the bottom of the ship to the connection between the hull and the water surface, which indirectly reflects the buoyancy of the ship while driving. The draft of a ship is the design draft and the structural draft (both are the draft at the static moment), the design draft is the vertical distance measured from the lower edge of the flat keel in the middle of the hull to the upper edge of the design waterline; the structural draft is measured by the lower edge of the flat keel in the middle of the hull Vertical distance to the ship's summer load line. When the ship is sailing, the overall or partial draft of the ship relative to the static moment will change....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B63B39/12G01S13/08
CPCY02A90/30
Inventor 孙维康周兴华唐秋华阳凡林刘强杨晓坤韩冰
Owner SHANDONG UNIV OF SCI & TECH
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