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Air maneuvering target detection method based on virtual time sampling and Wigner-Ville distribution (WVD) transformation

A detection method and technology for maneuvering targets, which are applied in measurement devices, radio wave measurement systems, and radio wave reflection/re-radiation, etc., can solve problems such as processing difficulties, clutter and target distance movement, and detection of air maneuvering targets. The effect of improving estimation accuracy

Inactive Publication Date: 2013-04-10
CIVIL AVIATION UNIV OF CHINA
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Problems solved by technology

When the pulse repetition frequency of the airborne early warning radar is constant, more sampling points mean that the CPI will be lengthened, which will cause clutter and distance movement of the target, which will bring greater difficulties to the subsequent processing
Therefore, WVD cannot be directly applied to detect air maneuvering targets

Method used

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  • Air maneuvering target detection method based on virtual time sampling and Wigner-Ville distribution (WVD) transformation
  • Air maneuvering target detection method based on virtual time sampling and Wigner-Ville distribution (WVD) transformation
  • Air maneuvering target detection method based on virtual time sampling and Wigner-Ville distribution (WVD) transformation

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[0030] The air maneuvering target detection method based on virtual time sampling and WVD transformation provided by the present invention will be described in detail below in conjunction with the accompanying drawings and specific examples.

[0031] Such as figure 1 As shown, the air maneuvering target detection method based on virtual time sampling and WVD conversion provided by the present invention includes the following steps carried out in order:

[0032] 1) The S1 stage of clutter suppression for the total echo data received by the airborne early warning radar:

[0033] In this stage, the present invention uses the subspace projection technology to suppress the clutter of the total echo data received by the airborne early warning radar, and projects the data of the unit to be detected into the orthogonal subspace of the clutter subspace to obtain the projected No clutter data. The clutter plus noise covariance matrix R is:

[0034] R=E{(x c +x n )(x c +x n ) H}=...

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Abstract

The invention provides an air maneuvering target detection method based on virtual time sampling and Wigner-Ville distribution (WVD) transformation. The detection method includes the following steps: (1) an S1 stage, wherein total echo data received by an airborne early warning radar is subjected to clutter rejection; (2) an S2 stage, wherein a target parameter two-dimensional searching range is ensured; (3) an S3 stage, wherein multi-array element data is utilized to finish the virtual time sampling; and (4) an S4 stage, wherein data after the virtual time sampling is subjected to the WVD transformation so as to form a cost function, thus a target parameter estimation result is obtained. According to the air maneuvering target detection method, the data after the multi-array element clutter rejection is subjected to the virtual time sampling, in other words, time sampling number of a single array unit is increased. Estimation accuracy of parameters is improved, and the data is subjected to the WVD transformation so as to construct the cost function. Obtained parameters corresponding to the maximum value of the cost function after searching is the estimation result of the target parameters. According to the air maneuvering target detection method, an accurate estimation result can be obtained on the condition of limited pulse points.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, in particular to an air maneuvering target detection method based on virtual time sampling and WVD transformation. Background technique [0002] Since the airborne early warning radar of the airborne platform is based on a high-altitude aircraft, it has the characteristics of long detection distance, large coverage, and flexible maneuverability. However, due to its downward-looking working state, it faces more complex ground (sea) clutter problems than ground-based radars. The clutter not only has a wide distribution range and high intensity, but also presents a space-time two-dimensional coupling distribution characteristic, which often causes the target to be submerged. In a strong clutter background, the ability to detect targets is therefore severely affected. Space-Time Adaptive Processing (Space-Time Adaptive Processing, STAP) is an effective means of airborne early warning...

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Application Information

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IPC IPC(8): G01S7/41G01S13/00
Inventor 李海吴仁彪郑景忠孙沂王小寒
Owner CIVIL AVIATION UNIV OF CHINA
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