High squint synthetic aperture radar imaging processing method

A synthetic aperture radar, imaging processing technology, applied in the field of radar, can solve problems such as low accuracy

Inactive Publication Date: 2015-11-25
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantages of low accuracy caused by the range-to-space variability of range migration and the azimuth space-to-space variability of Doppler parameters in the prior art, and provide a single-static SAR e

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  • High squint synthetic aperture radar imaging processing method

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Embodiment Construction

[0086] In order to describe content of the present invention conveniently, at first the following terms are explained:

[0087] High strabismus SAR: eg figure 1 As shown, the high squint SAR means that the beam of the platform is directed obliquely forward or obliquely behind the carrier aircraft, and the squint angle is greater than 40 degrees, which belongs to the high squint angle mode.

[0088] The present invention mainly adopts the method of simulation experiment to verify, and all steps and conclusions are verified correctly on Matlab2012. The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0089] Such as figure 2 As shown, a high squint synthetic aperture radar imaging processing method includes the following steps:

[0090] S1: Establish the spatial geometry structure of the high squint SAR, and calculate the echo signal of the high squint SAR according to the sp...

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Abstract

The invention discloses a high squint synthetic aperture radar imaging processing method, which comprises the steps of S1, calculating high squint synthetic aperture radar echo signals; S2, carrying out range fast Fourier transformation (FFT) and spatial-variant range walk correction on the echo signals, and removing range spatial-variant range walk; S3, carrying out range pulse compression and high-order range migration correction on the echo signals, and removing residual range migration; S4, carrying out azimuth spatial-variant property fitting of Doppler parameters on the echo signals; S5, balancing the Doppler centroid and the slope of frequency modulation of target points of the same range cell by adopting an extended azimuth nonlinear frequency modulation scaling algorithm; and S6, carrying out azimuth focusing so as to acquire an imaging result. The high squint synthetic aperture radar imaging processing method solves a range spatial-variant property and an azimuth spatial-variant property of the Doppler parameters, can realize precise focusing of monostatic SAR echo signals under a high-squint-angle condition, and can be widely applied to the fields of earth remote sensing, resource exploration, geological mapping, military reconnaissance and the like.

Description

technical field [0001] The invention belongs to the technical field of radar, and in particular relates to a high squint synthetic aperture radar imaging processing method. Background technique [0002] Synthetic Aperture Radar (SAR) is an all-weather, all-weather high-resolution imaging system. By transmitting a chirp signal with a large time-width bandwidth product, a pulse compression signal is obtained by matching filtering during reception, so as to obtain a range-wise high-resolution imaging system. , using synthetic aperture technology to achieve high resolution in azimuth. The imaging quality is not affected by weather conditions (clouds, light), etc., and has the characteristics of detecting and locating long-distance targets. Typical applications of SAR include disaster monitoring, resource exploration, geological surveying and mapping, military reconnaissance, etc. [0003] Compared with the front side view, the airborne SAR squint imaging has good flexibility a...

Claims

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Application Information

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IPC IPC(8): G01S13/90G01S7/41
CPCG01S7/411G01S13/904G01S13/9041
Inventor 武俊杰孙稚超杨建宇黄钰林杨海光
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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