Sea surface wind direction extraction method based on ship-borne high-frequency ground wave beyond visual range radar

A technology of over-the-horizon radar and sea surface wind direction, which is applied in the reflection/re-radiation of radio waves, radio wave measurement systems, and the use of re-radiation. High resolution, simple system, easy to achieve

Active Publication Date: 2014-03-05
HARBIN INST OF TECH
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Problems solved by technology

[0005] The purpose of the present invention is to provide a sea surface wind direction extraction method based on ship-borne high-frequency ground wave over-the-hor

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  • Sea surface wind direction extraction method based on ship-borne high-frequency ground wave beyond visual range radar
  • Sea surface wind direction extraction method based on ship-borne high-frequency ground wave beyond visual range radar
  • Sea surface wind direction extraction method based on ship-borne high-frequency ground wave beyond visual range radar

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specific Embodiment approach 1

[0024] Specific implementation mode one: the following combination figure 1 Describe this embodiment, the sea surface wind direction extraction method based on ship-borne high-frequency ground wave over-the-horizon radar described in this embodiment, the specific process of this method is:

[0025] Step 1. Select a range gate, and use a single receiving array element to obtain the first-order sea clutter spread spectrum in a range gate;

[0026] Step 2, establishing the space-time correspondence relationship of the first-order sea clutter broadened spectrum, and obtaining the space-time distribution characteristics of the first-order sea clutter broadened spectrum;

[0027] Step 3. According to the space-time distribution characteristics of the first-order sea clutter, determine the positive Bragg peak B corresponding to the incident azimuth of the sea clutter + , negative Bragg peak B - and spatial resolution;

[0028] Step 4. Obtain the relative intensity R of the positiv...

specific Embodiment approach 2

[0041] Specific implementation mode two: the following combination figure 1 This embodiment is described. This embodiment further describes Embodiment 1. The first-order sea clutter spread spectrum described in Step 1 is obtained by using a single receiving array element set on a mobile ship-borne platform.

specific Embodiment approach 3

[0042] Specific implementation mode three: the following combination figure 2 with image 3 Describe this embodiment, this embodiment will further explain Embodiment 2, the space-time distribution characteristic of the first-order sea clutter broadening spectrum described in step 2 is:

[0043]

[0044] where f d is the Doppler frequency, is the Bragg frequency, v is the velocity of the ship-borne platform, λ is the working wavelength of the radar, and g is the acceleration of gravity.

[0045] In this embodiment, through the space-time distribution characteristics of the first-order sea clutter broadening spectrum, according to the incident azimuth of the sea clutter The position and peak size of the corresponding positive and negative first-order Bragg peaks can be determined B + ,B - .

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Abstract

The invention provides a sea surface wind direction extraction method based on a ship-borne high-frequency ground wave beyond visual range radar, belongs to the field of ocean remote sensing, and solves the problems that an existing sea surface wind direction extraction method is small in detection range and has no continuity, and the system is complicated. The sea surface wind direction extraction method comprises the following specific steps: obtaining a first-order sea clutter widening spectrum in a distance door by using a single receiving array element; determining corresponding positive and negative Bragg peak values and a spatial resolution of a sea clutter incidence direction according to a first-order sea clutter space-hour distribute property; obtaining a sea surface wind direction according to the relative strength of the positive and negative Bragg peak values; applying the sea surface wind direction to a resolution unit of each sea area in the distance door and extracting the wind directions of all the sea areas in the distance door; comparing the sea surface wind directions of the resolution units of the adjacent sea areas and eliminating wind direction blurs to obtain the sea surface wind direction of the distance door; and repeating the steps until the sea surface wind directions of all the distance doors are obtained. The sea surface wind direction extraction method based on the ship-borne high-frequency ground wave beyond visual range radar is used for monitoring the sea environment.

Description

technical field [0001] The invention belongs to the field of marine remote sensing. Background technique [0002] Among the state parameters of the ocean surface, the sea surface wind field (wind direction and wind speed) is one of the key research objects in physics, and has an important impact on ocean engineering, military affairs, and navigation. At the same time, sea surface wind is also an active factor affecting the properties of elements such as waves, currents, and water masses, and is an important factor in the study of heat exchange and material exchange between the atmosphere and the ocean. Therefore, it is necessary to carry out real-time telemetry on the sea surface wind field to achieve the purpose of marine environment monitoring and disaster forecasting. [0003] At present, the remote measurement methods of sea surface wind field mainly include microwave scatterometer, synthetic aperture radar, anemometer, microwave radar and shore-based high-frequency gro...

Claims

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Application Information

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IPC IPC(8): G01S13/95
CPCG01S7/02G01S13/95Y02A90/10
Inventor 谢俊好孙明磊冀振元李高鹏
Owner HARBIN INST OF TECH
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