Ultra high resolution spaceborne SAR processing

Eldhuset, K.

doi:10.1109/taes.2004.1292176

Cited by 31 publications

(19 citation statements)

References 11 publications

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“…However, the fourth and higher order phase errors could not be compensated in A-ESRM. A fourth-order Doppler range model (DRM4) for space-borne SAR imaging was proposed by Eldhuset [18]- [21], and a 2-D exact transfer function (ETF) was derived. Compared with the conventional hyperbolic range model, the third and fourth order phase errors can be fully compensated, and a better imaging result can be obtained.…”

Section: Introductionmentioning

confidence: 99%

A High-Order Imaging Algorithm for High-Resolution Spaceborne SAR Based on a Modified Equivalent Squint Range Model

Wang

Liu

Chen

et al. 2015

IEEE Trans. Geosci. Remote Sensing

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Abstract-Two challenges have been faced in signal processing of ultra-high resolution space-borne synthetic aperture radar (SAR). The first challenge is constructing a precise range model and the second one is to develop an efficient imaging algorithm since traditional algorithms fail to process ultra-high resolution space-borne SAR data effectively. In this paper, a novel high-order imaging algorithm for high resolution space-borne SAR is presented. Firstly, a modified equivalent squint range model (MESRM) is developed by introducing equivalent radar acceleration into the equivalent squint range model, and it is more suitable for high resolution space-borne SAR. The signal model based on the MESRM is also presented. Secondly, a novel high-order imaging algorithm is derived. The insufficient pulse repetition frequency (PRF) problem is solved by an improved sub-aperture method and accurate focusing is achieved through an extended hybrid correlation algorithm. Simulations are performed to validate the presented algorithm.

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Section: Introductionmentioning

confidence: 99%

A High-Order Imaging Algorithm for High-Resolution Spaceborne SAR Based on a Modified Equivalent Squint Range Model

Wang

Liu

Chen

et al. 2015

IEEE Trans. Geosci. Remote Sensing

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“…Due to the fact that there is no differential RCMC in ETF algorithm, the difference between range migration curves of point targets in imaging region should not exceed half range resolution unit. The effective imaging swath size will be limited for high resolution and the limitation needs to be overcome by means of block processing along range direction [25]. When ignoring the restriction of (13), we can apply directly the conventional ETF algorithm to the equivalent monostatic model derived in Section 2 and denote this processing as EETF-1.…”

Section: Extended Etf Algorithm For Bisar Imagingmentioning

confidence: 99%

“…Finally azimuth compression is carried out through IFFT along azimuth direction. Details about this process, as well as derivations of (15) and (16), is available in many literatures on MoSAR imaging [23][24][25][26][27]. As (13) indicates, the effective imaging swath size will be limited by bistatic imaging geometry if we simply use EETF-1 algorithm mentioned above.…”

Section: Extended Etf Algorithm For Bisar Imagingmentioning

confidence: 99%

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Extended Exact Transfer Function Algorithm for Bistatic Sar of Translational Invariant Case

Sun¹,

Mao²,

Wang³

et al. 2009

PIER

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Abstract-This paper presents an Extended Exact Transfer Function (EETF) algorithm for Bistatic Synthetic Aperture Radar (BiSAR) imaging of a Translational Invariant (TI) case. This algorithm adopts directly the 2D transfer function of monostatic SAR (MoSAR), instead of deriving a new one, by converting the BiSAR into an equivalent MoSAR. A new azimuth phase compensation function is constructed through exploiting this equivalency. Geometry distortion correction for BiSAR imaging result is considered in the proposed algorithm. In addition, the applying condition of the algorithm is also discussed. One desirable property of the proposed algorithm is that the computing flow and efficiency are the same as ETF algorithm for MoSAR. The effectiveness is validated by point target simulations with Tandem and forward-looking configuration.

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“…However, for MEO SAR systems, the much longer integration time will introduce significant phase errors in signal processing based on old range models. Eldhuset 8,9 proposed a fourth-order Doppler range model (DRM4) to describe the range history of high-resolution spaceborne SAR, where the thirdand fourth-order phase errors can be fully compensated and a better imaging result can be obtained. However, the model does not consider the effect of higher order phase errors, which limits its application in MEO SAR.…”

Section: Introductionmentioning

confidence: 99%

Higher order nonlinear chirp scaling algorithm for medium Earth orbit synthetic aperture radar

Wang

Liu

Chen

et al. 2015

J. Appl. Remote Sens

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Abstract. Due to the larger orbital arc and longer synthetic aperture time in medium Earth orbit (MEO) synthetic aperture radar (SAR), it is difficult for conventional SAR imaging algorithms to achieve a good imaging result. An improved higher order nonlinear chirp scaling (NLCS) algorithm is presented for MEO SAR imaging. First, the point target spectrum of the modified equivalent squint range model-based signal is derived, where a concise expression is obtained by the method of series reversion. Second, the well-known NLCS algorithm is modified according to the new spectrum and an improved algorithm is developed. The range dependence of the twodimensional point target reference spectrum is removed by improved CS processing, and accurate focusing is realized through range-matched filter and range-dependent azimuth-matched filter. Simulations are performed to validate the presented algorithm. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Ultra high resolution spaceborne SAR processing

Cited by 31 publications

References 11 publications

A High-Order Imaging Algorithm for High-Resolution Spaceborne SAR Based on a Modified Equivalent Squint Range Model

A High-Order Imaging Algorithm for High-Resolution Spaceborne SAR Based on a Modified Equivalent Squint Range Model

Extended Exact Transfer Function Algorithm for Bistatic Sar of Translational Invariant Case

Higher order nonlinear chirp scaling algorithm for medium Earth orbit synthetic aperture radar

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