A new fourth-order processing algorithm for spaceborne SAR

Eldhuset, K.

doi:10.1109/7.705890

Cited by 137 publications

(76 citation statements)

References 18 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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“…In [20], Eldhuset inverted a fourth-order range equation to give an "exact" transfer function for a spaceborne monostatic SAR. This method has been extended in [21] for an bistatic azimuth-invariant spaceborne SAR.…”

Section: -D Spectrum Of a Bistatic Signalmentioning

confidence: 99%

Processing of Azimuth-Invariant Bistatic SAR Data Using the Range Doppler Algorithm

Neo

Wong²,

Cumming

2008

IEEE Trans. Geosci. Remote Sensing

226

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Abstract-This paper discusses bistatic synthetic aperture radar processing (complex image formation) using the Range Doppler Algorithm. The key step is to use an analytical form of the signal spectrum derived by the method of series reversion. The spectrum is used for secondary range compression (SRC), range cell migration correction, and azimuth compression. The algorithm is able to focus the azimuth-invariant bistatic configuration where the transmitter and receiver platforms are moving in parallel tracks with identical velocities. Moreover, the algorithm is able to handle reasonably high squints and wide apertures because SRC can be performed in the 2-D frequency domain.Index Terms-Bistatic synthetic aperture radar (SAR) processing, range cell migration correction (RCMC), Range Doppler Algorithm (RDA), secondary range compression (SRC), series reversion.

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“…Since a more accurate range model and a different azimuth compression reference function are required for generating high quality images, the 1-4th order Doppler parameters are necessary. Various Doppler parameter calculation algorithms have been reported for Leo-SAR, but show large errors when applied to Geo-SAR due to geometrical approximation [10][11][12][13]. Actually, in the satellite case, the geometry is more complicated, as the orbit is elliptical and the Earth is modeled as an ellipsoid rotating independently of the sensor trajectory.…”

Section: Introductionmentioning

confidence: 99%

The Accurate Fourth-Order Doppler Parameter Calculation and Analysis for Geosynchronous Sar

Zhao¹,

Qi²,

Song³

et al. 2013

PIER

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Abstract-This paper presents a new approach to calculate the 1-4th order Doppler parameters for Geosynchronous Synthetic Aperture Radar (Geo-SAR). To get accurate calculation results, the Earth is modeled as an ellipsoid and the relative motion between the sensor in an elliptical orbit and the rotating Earth is analyzed. The J 2 , J 3 and J 4 orbital perturbation items and attitude steering are analyzed. Ignoring the perturbation force would produce errors of the Doppler parameters for spaceborne SAR because it can influence the six orbital elements. Since the Doppler parameters are related to the antenna beam pointing directions and influenced by attitude of SAR platform, the calculation results before and after attitude steering are shown. Furthermore, the Doppler parameter properties during the whole orbital periods of Geo-SAR are compared with those of Low-Earth-Orbital SAR (Leo-SAR). Finally, the effects on Doppler parameters stemmed from the radar beam pointing accuracy are analyzed.

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A new fourth-order processing algorithm for spaceborne SAR

Cited by 137 publications

References 18 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

Processing of Azimuth-Invariant Bistatic SAR Data Using the Range Doppler Algorithm

The Accurate Fourth-Order Doppler Parameter Calculation and Analysis for Geosynchronous Sar

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