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Bistatic ISAR (inverse synthetic aperture radar) imaging detection method for stealth aircraft

An imaging detection and aircraft technology, applied in measuring devices, radio wave measurement systems, radio wave reflection/re-radiation, etc., can solve the problem that stealth aircraft cannot be effectively identified by single-base ISAR, and achieve two-dimensional high-resolution, Improve theoretical research and improve the effect of imaging focusing results

Active Publication Date: 2017-09-12
HEFEI UNIV OF TECH
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a dual-base ISAR imaging detection method for stealth aircraft to solve the problem that stealth aircraft cannot be effectively identified by single-base ISAR

Method used

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  • Bistatic ISAR (inverse synthetic aperture radar) imaging detection method for stealth aircraft
  • Bistatic ISAR (inverse synthetic aperture radar) imaging detection method for stealth aircraft
  • Bistatic ISAR (inverse synthetic aperture radar) imaging detection method for stealth aircraft

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Embodiment Construction

[0040] Such as figure 1 As shown, a bistatic ISAR imaging detection method for stealth aircraft includes the following steps:

[0041] step one

[0042] The range-Doppler imaging algorithm is used to mathematically model the reflected echo signals received by the bistatic ISAR.

[0043] The reflected echo signal formula is as follows:

[0044]

[0045] In formula (1), a r ( ) and a a (·) are the window function and the azimuth window function of the radar chirp signal respectively, t r is the fast time, t m is the slow time, R(t m ) is the instantaneous slant distance related to slow time, C is the speed of light, exp is an exponential function with natural logarithm e as the base, j is the imaginary number unit, γ is the modulation frequency of the transmitted signal, and λ is the signal wavelength.

[0046] step two

[0047] After the echo signal is obtained, data processing including range compression, range migration correction, and azimuth compression should be...

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Abstract

The invention discloses a bistatic ISAR (inverse synthetic aperture radar) imaging detection method for a stealth aircraft. The problem that the stealth aircraft cannot be effectively identified by monostatic ISAR is solved. A process is realized as follows: (1) point target echo information of the stealth aircraft is accurately expressed; (2) distance compression treatment is carried out; (3) calibration including range walk and range migration is carried out; (4) azimuth compression is completed to obtain an azimuth focus result; (5) two-dimensional inverse Fourier transform of distances and azimuths to signals is carried out, an imaging result with high resolution can be obtained when the transform in a two-dimensional time domain occurs. The bistatic ISAR imaging detection method disclosed by the invention has a high-resolution imaging result with a preferable focusing effect; by utilizing the imaging processing method of the bistatic ISAR, the stealth aircraft can be effectively detected.

Description

technical field [0001] The invention relates to the field of radar remote sensing signal processing and remote sensing imaging methods, in particular to a dual-base ISAR imaging detection method for stealth aircraft. Background technique [0002] As an all-weather, all-time, and long-distance information acquisition method, Inverse Synthetic Aperture Radar (ISAR) can complete reconnaissance and surveillance tasks that are difficult for optical radar and infrared radar in complex environments, and obtain high-resolution images. ISAR 2D imagery. ISAR images can be used to identify and classify moving targets, battlefield early warning and surveillance, aircraft tower control and space target surveillance, etc., and are widely used in military and civilian applications. [0003] The same as the general bistatic radar, Bistatic Inverse Synthetic Aperture Radar (BiISAR) separates the ISAR transmitter platform and receiver platform in different spatial positions, and uses backsca...

Claims

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Application Information

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IPC IPC(8): G01S13/90G01S7/41
CPCG01S7/41G01S13/904G01S13/9064G01S2013/029G01S13/9058
Inventor 周芳刘彦斌杨学志
Owner HEFEI UNIV OF TECH