Method for estimating wind field turbulence intensity by using airborne radar

A technology of turbulence intensity, airborne radar, applied in the direction of utilizing re-radiation, reflection/re-radiation of radio waves, measuring devices, etc.

Active Publication Date: 2016-06-01
CHINA ACAD OF AEROSPACE AERODYNAMICS
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Problems solved by technology

However, neither the spectral width data nor the turbulent dissipation rate is directly equivalent to the turbulent in

Method used

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  • Method for estimating wind field turbulence intensity by using airborne radar
  • Method for estimating wind field turbulence intensity by using airborne radar
  • Method for estimating wind field turbulence intensity by using airborne radar

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Embodiment 1

[0061] Step 1: The definition formula of turbulence intensity of wind field and the definition formula of spectrum width data of wind field are combined into a system of equations.

[0062] The definition of turbulence intensity in wind field is:

[0063] σ 2 = lim T → ∞ 1 2 T ∫ - T T ( v - v ‾ ) 2 d t ,

[0064] Among them, σ is the turbulence intensity of the wind field, T is the time scale for measuring the statistical average wind spee...

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Abstract

The invention relates to a method for estimating wind field turbulence intensity, and especially to a method for estimating wind field turbulence intensity by using airborne radar. The method includes the following steps of: forming a simultaneous equation set by using a turbulence intensity definition formula of a wind field and a spectral width data definition formula of the wind field; deriving a relation formula comprising spectral width data and the turbulence intensity according to a turbulence wind field frequency spectrum model so as to close the above equation set; measuring the wind field of a target region by the airborne radar in real time so as to obtain the spectral width data of the wind field; and calculating the closed equation set by using the obtained spectral width data of the wind field so as to obtain an estimated value of the turbulence intensity of the wind field. According to the invention, the turbulence intensity of the detected wind field is estimated by using statistical characteristics, especially the spectral width data, obtained from the wind field detection through Doppler weather radar. The method for estimating the wind field turbulence intensity by using the airborne radar provides a turbulence intensity estimation three-dimensional distribution field according to space distribution and time distribution for pilots and commanders.

Description

technical field [0001] The invention relates to a method for estimating the intensity of turbulence in a wind field. More specifically, the present invention relates to a method for estimating wind field turbulence intensity using airborne radar. Background technique [0002] Flying through dangerous wind fields will cause aircraft turbulence and large body overload, which will not only seriously affect the ride quality of passenger aircraft, but also lead to dangerous incidents such as cabin injuries. Passenger injuries occur frequently when encountering turbulence. [0003] In order to study the flight safety of crossing the wind field, the turbulent intensity information of the wind field must be obtained. There are many ways to measure the turbulent intensity. The most commonly used definition is given based on the energy distribution of the wind field. The turbulent intensity is equal to The root mean square value of the wind field velocity. If the root mean square va...

Claims

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Application Information

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IPC IPC(8): G01S13/95
CPCG01S13/953Y02A90/10
Inventor 韩国玺刘强张建村白鹏关发明
Owner CHINA ACAD OF AEROSPACE AERODYNAMICS
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