Synthetic aperture radar polar coordinates format image-forming algorithm based on variable metric principle

A technology of synthetic aperture radar and polar coordinate format, which is applied in the directions of radio wave reflection/re-radiation, utilization of re-radiation, measurement devices, etc., and can solve problems such as the influence of PFA algorithm calculation efficiency

Inactive Publication Date: 2008-07-09
苏州杰岚德信息技术有限公司
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  • Synthetic aperture radar polar coordinates format image-forming algorithm based on variable metric principle
  • Synthetic aperture radar polar coordinates format image-forming algorithm based on variable metric principle
  • Synthetic aperture radar polar coordinates format image-forming algorithm based on variable metric principle

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[0064] The present invention will be further explained in detail below in conjunction with the accompanying drawings and specific embodiments.

[0065] In the present invention, the SAR system works in the medium squint mode, and the antenna moves with a fixed forward speed v, then the PFA algorithm based on the PCS principle described in the present invention can be applied to perform imaging processing on the echo signal, using two-dimensional separation distance, Azimuth variable scaling (scaling) replaces the distance and azimuth interpolation in the traditional PFA algorithm to achieve resampling.

[0066] The synthetic aperture radar polar coordinate format imaging algorithm based on the variable-scale principle proposed by the present invention is theoretically verified through simulation experiments, and the theoretical analysis and simulation experiment results prove the effectiveness of the present invention. The radar parameters are shown in Fig. 7.

[0067] In the...

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Abstract

A synthetic aperture radar polar format algorithm based on scaling principle comprises the following steps of : constructing a data collection geometric model of spotlight synthetic aperture radar; carrying out range-dimension processing pulse by pulse, inputting time-domain echo signals, subjecting the time-domain echo signals to range scaling to obtain output signals, i.e. range frequency domain signals achieving range re-sampling; processing the range frequency domain signals (scaling and focusing) to obtain an azimuth-focused image while achieving azimuth scaling (azimuth re-sampling); and subjecting the azimuth-focused data to fast Fourier transform in range dimension to obtain a two-dimensional focused image. The invention can achieve re-sampling by using two-dimensional transformation to substitute for two-dimensional interpolation in conventional PFA algorithm. The method only needs FFT and complex multiplication operation, and the computation efficiency can be improved significantly. Meanwhile, the possible phase error resulting from the finite interpolation kernel length can be obviated.

Description

technical field [0001] The invention relates to a synthetic aperture radar polar coordinate format imaging algorithm, in particular to a synthetic aperture radar polar coordinate format imaging algorithm based on the variable scale principle. Background technique [0002] The Polar Format Imaging Algorithm (PFA) is an ideal method in spotlight Synthetic Aperture Radar (SAR) imaging because of its simple algorithm flow and easy compensation for the non-uniform linear motion of the radar platform. PFA algorithm such as literature 1: J.L.Walker, Range-Doppler imaging of rotating objects, IEEETransactions on Aerospace and Electronic systems, vol.16, no.1, pp.23-52, January1980. and literature 2: D.A.Ausherman, A.Kozma , J.L.Walker, H.M.Jones, and E.C.Poggio, Development in radar imaging, IEEE Transactions on Aerospace and Electronic Systems, vol.20, no.4, pp.363-400, July 1984. and Reference 3: W.G.Carrara, R.S.Goodman, and R.M. Majewski, Spotlight Synthetic Aperture Radar: Sig...

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IPC IPC(8): G01S7/02G01S13/90
Inventor 朱岱寅聂鑫毛新华李勇
Owner 苏州杰岚德信息技术有限公司
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