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Synthetic aperture radar imaging method for azimuth-direction nonlinear chirp scaling of diving model

A technology of synthetic aperture radar and imaging method, which is applied in the field of signal processing, can solve the problems of insufficient range model accuracy and inappropriate high-precision imaging processing, and achieve high-precision SAR imaging and increase the effect of focal depth

Active Publication Date: 2012-12-12
BEIHANG UNIV
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Problems solved by technology

Zhou Song et al. proposed a missile-borne SAR descending section imaging method based on azimuth nonlinear scaling. This method can handle data processing under the subduction model, but it is not suitable for high-precision imaging processing due to the insufficient accuracy of the range model it uses.

Method used

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  • Synthetic aperture radar imaging method for azimuth-direction nonlinear chirp scaling of diving model
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  • Synthetic aperture radar imaging method for azimuth-direction nonlinear chirp scaling of diving model

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Embodiment

[0114] The radar parameters are shown in Table 1.

[0115] Table 1 Radar parameters

[0116]

[0117] According to the parameters in Table 1, the echo simulation of the 3×3 lattice target located on the ground within the range of 1800m×1200m is carried out to obtain the full-aperture echo data, and the parameters in Table 1 are used to perform the following steps on the full-aperture echo data Imaging processing.

[0118] Step 1: Correct distance walking;

[0119] For SAR raw echo data s 0 (τ, t) do range-to-fast Fourier transform (FFT), transform the echo data to the range frequency domain-azimuth time domain for distance walking correction, and combine the transformed echo data with the factor H 1 (f τ ,t) multiplied together to complete the correction of the walking distance.

[0120] Will K r =Bw / t p Substituting into formula (4) to obtain the original echo data of SAR, using POSP, the original echo data s 0 (τ,t) do range-wise FFT to get the data S in the range...

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Abstract

The invention provides a synthetic aperture radar (SAR) imaging method for azimuth-direction nonlinear chirp scaling of a diving model. The synthetic aperture radar imaging method includes carrying out range-direction fast Fourier transform (FFT) for raw echoed data of SAR and then carrying out range walk correction; carrying out range compensation after the azimuth-direction FFT; carrying out range-direction inverse fast Fourier transfer (IFFT) before three times of phase compensation; carrying out azimuth-direction nonlinear chirp scaling after the azimuth-direction IFFT; and finally carrying out azimuth-direction FFT again, carrying out azimuth compensation, and then carrying out azimuth-direction IFFT for data subjected to azimuth compensation to obtain a final SAR image. By the synthetic aperture data imaging method, SAR imaging at large squint angles can be realized, azimuth-direction focusing depth is increased, and high-precision SAR imaging under high-azimuth focusing depth can be realized in the diving model.

Description

technical field [0001] The invention relates to a synthetic aperture radar (SAR) imaging method for nonlinearly changing the azimuth direction of a dive model, and belongs to the technical field of signal processing. Background technique [0002] Synthetic Aperture Radar (SAR) is a microwave imaging radar with high resolution capability. Compared with optical and infrared sensors, SAR has the unique advantages of all-day, all-weather work and long range. Under the conditions of missile loading, SAR is applied to the missile terminal guidance, because it can find targets in harsh environments such as night, smoke, and strong light interference, so SAR is more suitable for the complex environment of missile work in actual combat. In the terminal guidance stage of the missile, the SAR seeker matches the acquired image containing ground scene information with its own electronic image, calculates the position coordinates of the seeker from the spatial geometric relationship, and ...

Claims

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Application Information

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IPC IPC(8): G01S13/90
Inventor 徐华平肖忠源李春升
Owner BEIHANG UNIV
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