An Improved Range Model and Omega-K-Based Imaging Algorithm for High-Squint SAR With Curved Trajectory and Constant Acceleration

Li, Zhenyu; Liang, Yi; Xing, Mengdao; Gao, Yuexin; Zeng, Letian; Bao, Zheng

doi:10.1109/lgrs.2016.2533631

Cited by 32 publications

(24 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In (18), the first term is a wavenumber-domain matching factor, and the second term represents the focusing position along the cross LOS. The last term represents the range focusing position after range IFFT.…”

Section: B Modified Stolt Interpolationmentioning

confidence: 99%

“…Reviewing (18), for the conventional full-aperture imaging, 2-D focusing can be achieved via a matched filter and a subsequent 2-D IFFT. However, for subaperture data processing, as the length of the effective synthetic aperture is much smaller than the width of the scene, the conventional imaging algorithms in the time domain cannot cover all of the points in the scene.…”

Section: Wavenumber-domain Focusingmentioning

confidence: 99%

“…The motion characteristics will be changed after resampling operation, it brings a great challenge for MoCo and affects the final focusing quality. For maneuvering SAR with a curved track, Li et al [18] propose an extended Omega-K with the consideration of constant accelerations. This method acquires an approximation value of the real slant range history in order to establish a similar HRM for simplifying the subsequent imaging procedures.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Focusing of Maneuvering High-Squint-Mode SAR Data Based on Equivalent Range Model and Wavenumber-Domain Imaging Algorithm

Chen

et al. 2020

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

Self Cite

View full text Add to dashboard Cite

Due to the complexity of high-squint synthetic aperture radar (SAR) mounted on maneuvering platforms, the traditional geometric model and imaging algorithms cannot be directly applied in the diving or climbing stage for the existence of vertical velocity. Aiming at this issue, an equivalent geometric model of maneuvering high-squint-mode SAR is constructed, and a modified wavenumber-domain imaging algorithm combined with the proposed equivalent range model is proposed in this article. First, the disadvantages of the conventional range model are analyzed in detail and an equivalent range model is proposed to describe the motion characteristic of squint SAR in maneuvering mode, which maintains the azimuth-shift invariance along the flight direction in the new slant range plane. Then, to achieve the requirement of maneuvering SAR real-time processing, a modified wavenumberdomain imaging algorithm with a high usage of the spectrum by axis rotation for high-squint SAR data is proposed. Further, since the equivalent model may introduce the severe distortion in the imaging plane, a novel geometric correction method based on inverse projection is performed to obtain the ground imagery with a little distortion. Finally, simulation and real-data processing results validate the superiority of the proposed algorithm. Index Terms-Equivalent range model, geometric correction, high-squint mode, maneuvering synthetic aperture radar (SAR), wavenumber domain. I. INTRODUCTION S YNTHETIC aperture radar (SAR) [1], as an active microwave sensor, is widely mounted on maneuvering platforms (MPs), such as unmanned aerial vehicles [2], [3] and missiles [4], [5]. Compared with other motion platforms, the SAR sensors mounted on MPs have some special characteristics, such as flexible flight tracks, high-squint observation, and real-time Manuscript

show abstract

Section: B Modified Stolt Interpolationmentioning

confidence: 99%

Section: Wavenumber-domain Focusingmentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Focusing of Maneuvering High-Squint-Mode SAR Data Based on Equivalent Range Model and Wavenumber-Domain Imaging Algorithm

Chen

et al. 2020

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

Self Cite

View full text Add to dashboard Cite

show abstract

“…Many conventional imaging algorithms work properly when the squint angle is small. At high squint angles, on the other hand, the slant range needs to be approximated with more terms and the range-azimuth coupling becomes serious, leading to more complicated algorithms [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…In [2], a fractional chirp scaling algorithm (FrCSA) was proposed to deal with large range migration and strong space-variant properties of the SAR images produced in missile-borne missions at a squint angle of 40 • . In [3], a modified ωK algorithm, based on a different range model, was proposed for SAR imaging on a curved trajectory at squint angles up to 60 • . In [4], an improved step transform (IST) algorithm was developed for stripmap SAR imaging in the X-band, at squint angles up to 75 • .…”

Section: Introductionmentioning

confidence: 99%

An Improved Range-Doppler Algorithm for Sar Imaging at High Squint Angles

Chen¹,

Kiang²

2017

PIER M

View full text Add to dashboard Cite

Abstract-An improved range-Doppler algorithm (RDA) is proposed to reconstruct images from synthetic aperture radar (SAR) data received at high squint angles. At a higher squint angle, a larger synthetic aperture is required to receive sufficient amount of data for image reconstruction, and the range migration also becomes more serious, which demands more computational load and larger memory size. The proposed method can generate better SAR images with less computational load and memory than the conventional RDA, which is verified by simulations.

show abstract

A novel AFNCS algorithm for super-resolution SAR in curve trajectory

Zhang

2020

Multimedia Systems

View full text Add to dashboard Cite

An Improved Range Model and Omega-K-Based Imaging Algorithm for High-Squint SAR With Curved Trajectory and Constant Acceleration

Cited by 32 publications

References 12 publications

Focusing of Maneuvering High-Squint-Mode SAR Data Based on Equivalent Range Model and Wavenumber-Domain Imaging Algorithm

Focusing of Maneuvering High-Squint-Mode SAR Data Based on Equivalent Range Model and Wavenumber-Domain Imaging Algorithm

An Improved Range-Doppler Algorithm for Sar Imaging at High Squint Angles

A novel AFNCS algorithm for super-resolution SAR in curve trajectory

Contact Info

Product

Resources

About