Turbulence target velocity spectrum width estimation method based on space-time covariance matrix fitting

A technology of covariance matrix and target velocity, applied in the direction of radio wave reflection/re-radiation, using re-radiation, measuring devices, etc., can solve the problems of complexity, low complexity of pulse pair method, and unsatisfactory estimation performance, etc., to achieve Effect of Effective Spectral Width Estimation

Inactive Publication Date: 2018-01-30
CIVIL AVIATION UNIV OF CHINA
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Problems solved by technology

The pulse pair method has low complexity and can meet the real-time performance of airborne weather radar, but it is only suitable for high signal-to-noise ratio
The biggest difference between the fast Fourier transform method and the pulse pair method is that the former transforms the echo signal

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  • Turbulence target velocity spectrum width estimation method based on space-time covariance matrix fitting
  • Turbulence target velocity spectrum width estimation method based on space-time covariance matrix fitting
  • Turbulence target velocity spectrum width estimation method based on space-time covariance matrix fitting

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[0020] The turbulent target velocity spectral width estimation method based on space-time covariance matrix fitting provided by the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] like figure 1 As shown, the turbulent target velocity spectrum width estimation method based on space-time covariance matrix fitting provided by the present invention includes the following steps in order:

[0022] 1) Initialize the radar echo data of all the range units to be detected, and estimate the covariance matrix of the radar echo signal from the radar echo data of the range units to be detected received by the array antenna on the airborne weather radar

[0023] The airborne forward view array geometric model is as follows figure 2 As shown, first initialize the radar echo data of all the distance units to be detected: Assume that the aircraft flies in a straight line at a constant speed V, the airborne ra...

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Abstract

A turbulence target velocity spectrum width estimation method based on space-time covariance matrix fitting comprises the steps of 1) initializing radar echo data of a to-be-detected distance unit, estimating the covariance matrix ( R <^>) of a radar echo signal based on the radar echo data of the to-be-detected distance unit received by an array, constructing a covariance matrix model RS (fo, sigma f) of a turbulence target signal of the distance unit according to the spatial taper angle of the to-be-detected distance unit, constructing a cost function, carrying out two-dimensional search ina target parameter range to find the parameter combination {f<^>o, sigma<^> f } with the maximum value of the cost function, obtaining the turbulence target velocity spectrum width estimation value ofthe distance unit by a doppler spectrum width; and 4) repeating the previous steps to process the echo data received by the radar for each distance unit one by one, and finally obtaining the turbulence target velocity spectrum width estimation result of the whole distance unit. Simulation results show that under the condition of low signal-to-noise ratio, a relatively accurate turbulence target speed spectrum width estimation result can be obtained through the method.

Description

technical field [0001] The invention belongs to the technical field of airborne meteorological radar meteorological target detection, in particular to a turbulent target velocity spectrum width estimation method based on space-time covariance matrix fitting. technical background [0002] Atmospheric turbulence is a dangerous meteorological object often encountered by aircraft during operation, which is caused by the rapidly changing airflow in the atmosphere. Because the velocity vector of the airflow in the turbulent area is very different and the changes are quite sharp, once the aircraft flies into the turbulent area, it will cause turbulence at light level. In severe cases, the aircraft may lose control for a short time, resulting in unimaginable consequences. Atmospheric turbulence is highly hazardous and has a wide range of action (ranging from a few kilometers to a dozen kilometers). Airborne Weather Radar (AWR) is used to detect turbulence in dangerous weather areas ...

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Application Information

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IPC IPC(8): G01S7/41G01S13/95
CPCY02A90/10
Inventor 李海段佳玲湛蕾吴仁彪
Owner CIVIL AVIATION UNIV OF CHINA
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