Near field-to-near field transformation method of radar scattering cross section

A radar cross section and near-field technology, applied in radio wave measurement systems, instruments, etc., to solve problems such as inability to derive

Active Publication Date: 2013-02-27
BEIHANG UNIV
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Problems solved by technology

[0004] However, NFFFT realizes the transformation from near-field to far-field RCS based on the image, that is, given the near-field RCS measurement data, the far-field RCS data of the target can be obtained, but different distances cannot be deduced from the measured near-field RCS Other near-field RCS data under

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Embodiment Construction

[0028] figure 1 It is a flow chart of Embodiment 1 of the conversion method from the near field to the near field of the radar scattering cross section of the present invention, as figure 1 As shown, the transformation method from the RCS near field to the near field in this embodiment may include:

[0029] Step 101, measure and acquire first near-field scattering data of a radar target at a first distance.

[0030] In this embodiment, the radar target to be tested satisfies the far-field condition in the pitch direction, namely where R 0 is the distance between the radar and the center of the target to be measured, λ is the radar wavelength, h is the length of the target to be measured in the pitch direction; and satisfies the scalar synthetic aperture radar (Synthetic Aperture Radar, referred to as: SAR) scattering distribution model, for example , the radar target to be tested consists of five ideal point scattering centers, and their distribution and scattering intensi...

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Abstract

The invention provides a near field-to-near field transformation method of a radar scattering cross section. The near field-to-near field transformation method comprises the steps of performing measurement to obtain first near field scattering data at a first distance of a radar target; preprocessing the first near field scattering data to obtain first near field preprocessed data; according to the first near field preprocessed data, obtaining second near field preprocessed data at a second distance of the radar target; and according to the second near field preprocessed data, obtaining second near field scattering data at the second distance of the radar target, wherein scattering data at any distance within the range of the near field of the target can be obtained through the measured near field scattering data at a certain distance, and accordingly, radar cross section (RCS) data at any distance within the range of the near field of the target can be obtained. By means of the near field-to-near field transformation method, testing cost is reduced, and changes of scattering properties of the target to be tested along with the distance can be conveniently researched.

Description

technical field [0001] The invention relates to radar signal processing technology, in particular to a method for transforming radar scattering cross-section from near field to near field. Background technique [0002] Radar cross section (Radar Cross Section, referred to as: RCS) measurement technology is one of the important means to study the radar scattering characteristics of the target, RCS and the wavelength λ of the radar emission signal, the shape and material of the target to be measured, and the location of the target to be measured related. The core data of RCS is scattering data. To obtain the RCS of the target to be measured, that is to measure its scattering data, and then calculate the RCS through the formula. However, the cost of directly measuring scattering data is relatively high. At present, Image-Based Near Field-to-Far Field Transformation (IB NFFFT) technology can generally be used to measure the target in a certain The near-field scattering data of...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
Inventor 孙双锁许小剑
Owner BEIHANG UNIV
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