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Radar imaging method

An imaging method and radar technology, applied in the direction of reflection/re-radiation of radio waves, use of re-radiation, measurement devices, etc., can solve the problems of slow processing speed, distance-azimuth coupling, and large distance migration.

Active Publication Date: 2019-05-10
NORTH CHINA UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0005] The purpose of the present invention is to provide a radar imaging method, which can adapt to the characteristics and requirements of the signal model of large field of view and large squint, so as to solve the problem of large errors and relatively large distance migration when the current ground-based synthetic aperture radar has a large squint angle of view. Problems such as large distance and azimuth coupling, and slow processing speed

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Embodiment 1

[0097] see figure 1 A radar imaging method provided in this embodiment is mainly applied to a linear track radar system. The radar of the system is installed on a platform that can be rotated arbitrarily. The radar imaging method includes steps:

[0098] S1, respectively by θ 1 , θ 2 ,...,θ M M scans are performed for oblique angles, and M echo signals transformed into the frequency domain are obtained through data preprocessing.

[0099] S2. Perform azimuth Fourier transform and phase wavenumber domain modeling on each echo signal in the frequency domain to obtain a wavenumber domain signal.

[0100] S3. Compensating the first-order range wavenumber and squint phase for each wavenumber domain signal in sequence, and calculating the Doppler center according to the squint angle, and then obtaining a wavenumber domain signal independent of the squint angle.

[0101] S4. Simultaneously perform Stolt interpolation on multiple wavenumber domain signals, and then perform coheren...

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Abstract

The invention discloses a radar imaging method, which is applied to a linear orbit radar system. A radar of the system is installed on an arbitrarily rotatable platform. The method comprises the following steps: first scanning M oblique angles to obtain M echo signals transformed into the frequency domain, performing azimuth Fourier transform, phase wave number domain modeling, compensation distance wave number first order, and squint phase compensation on the obtained echo signals, calculating the Doppler center to obtain wave number domain signals, simultaneously performing Stolt interpolation and coherent integration on the plurality of wave number domain signals, and finally performing inverse Fourier transform to obtain a focused image. The imaging method provided by the invention effectively solves the problem such as, when processing the echo signals collected by large oblique angles, large error, large distance migration, serious distance azimuth coupling and slow processing speed due to large oblique angles of the current ground-based synthetic aperture radar.

Description

technical field [0001] The invention relates to the field of radar imaging, in particular to a radar imaging method. Background technique [0002] Synthetic aperture radar has the characteristics of all-day, all-weather, long-distance, and high-resolution imaging. Since its inception, it has been widely used in civilian and military fields. According to different carriers, it can be divided into airborne synthetic aperture radar and spaceborne synthetic aperture radar. Radar and ground-based synthetic aperture radar. In recent years, natural disasters such as landslides and landslides have occurred frequently in my country, and the research needs of ground-based synthetic aperture radar are quite urgent. Compared with traditional monitoring and early warning methods, it has the following characteristics: wide monitoring range, up to several square kilometers; deformation High measurement accuracy, using the principle of phase difference interference, the accuracy can reach s...

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Application Information

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IPC IPC(8): G01S13/90
Inventor 张远王彦平刘航林赟李洋
Owner NORTH CHINA UNIVERSITY OF TECHNOLOGY