Cylindrical surface near-field three-dimensional RCS imaging method combined with RM algorithm and BP algorithm

A technology of BP algorithm and imaging method, which is applied in the direction of radio wave reflection/re-radiation, utilization of re-radiation, measurement devices, etc., which can solve the problems of time-consuming and inability to know the imaging effect of test data in real time, etc.

Active Publication Date: 2014-11-05
CHINA ELECTRONIS TECH INSTR CO LTD
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Problems solved by technology

Both the testing and imaging process are time-consuming, and it is impossible to know in real time how the imaging effect of the test data is and whether there is an error during the test

Method used

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  • Cylindrical surface near-field three-dimensional RCS imaging method combined with RM algorithm and BP algorithm
  • Cylindrical surface near-field three-dimensional RCS imaging method combined with RM algorithm and BP algorithm
  • Cylindrical surface near-field three-dimensional RCS imaging method combined with RM algorithm and BP algorithm

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Embodiment 1

[0034] The present invention provides a cylindrical near-field three-dimensional RCS imaging method combining RM algorithm and BP algorithm, which includes the following steps:

[0035] Step 1: Perform one-dimensional Fourier transform on the sampling data S(z, k, θ) at a certain angle in the z direction to transform the echo data to k z domain, Formula 1: ψ(k z , k, θ) = ∫S(z, k, θ) exp(-jk z z)dz; among them, the sampling point is set as (z, θ); the target scattering measurement data when the working frequency f corresponds to the wave number k is expressed as S(z, k, θ); k z Represents the vertical direction component of wave vector k; k represents the size (wavenumber) of wave vector k; θ represents the angle of the turntable; z represents the vertical direction; j represents the complex imaginary part unit;

[0036] Step 2: Perform spatial filtering to move the wave vector to the imaging position. L represents the length of the microwave signal line. In the simulation d...

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Abstract

The invention provides a cylindrical surface near-field three-dimensional RCS imaging method combined with an RM algorithm and a BP algorithm. The range migration RM algorithm and the convolution-back projection BP algorithm are combined to design a new cylindrical surface near-field three-dimensional RCS imaging algorithm, and in the testing process, testing data of all the angles of a rotary table are imaged in real time by adopting the RM algorithm to obtain two-dimensional range azimuth direction images. After tests are finished, the two-dimensional range azimuth direction images are processed by adopting the BP algorithm so that final three-dimensional images can be obtained fast. According to the imaging algorithm, the time for the testing process is used, multiple integration of all points in a traditional algorithm is avoided, imaging speed is increased, longitudinal two-dimensional range azimuth direction imaging results can be monitored in real time in the testing process by using the imaging method, the invalid testing process can be avoided to a certain degree, and effectiveness of the tests can be improved.

Description

technical field [0001] The invention belongs to the technical field of cylindrical near-field three-dimensional RCS imaging of RM algorithm and BP algorithm, and in particular relates to a cylindrical near-field three-dimensional RCS imaging method combined with RM algorithm and BP algorithm. Background technique [0002] Three-dimensional RCS imaging uses the measurement of different positions in two directions and the radar echo obtained by frequency sweep to calculate the three-dimensional image of target radar scattering. Compared with two-dimensional imaging, three-dimensional high-resolution microwave imaging can filter out the influence of the bracket, and can better reflect the electromagnetic scattering characteristics of the target. How to obtain the three-dimensional distribution of target strong scattering points from echo data is the core problem of imaging. Different imaging algorithms require different testing requirements, different imaging speeds, and diffe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/89
CPCG01S7/02G01S13/89
Inventor 颜振刘伟杜刘革胡大海周扬王亚海年夫顺常庆功张文涛赵锐
Owner CHINA ELECTRONIS TECH INSTR CO LTD
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