Equivalent hyperbolic range model for synthetic aperture radar with curved track

Li, Zhenyu; Liang, Yi; Xing, Mengdao; Gao, Yuexin; Chen, Jianlai

doi:10.1049/el.2016.1366

Cited by 5 publications

(8 citation statements)

References 7 publications

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“…Evidently, from Figure 11, the integration time at different locations varies widely. It should be noted that Equation (22) is usually difficult to solve, but considering that the angle change caused by the high-order angular velocity can be ignored, if the accuracy allows, only ∇µ 1 (•) and ∇µ 2 (•) can be reserved by solving the quadratic equation to calculate T syn .…”

Section: Integration Timementioning

confidence: 99%

Curvilinear Flight Synthetic Aperture Radar (CF-SAR): Principles, Methods, Applications, Challenges and Trends

et al. 2022

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The research into curvilinear flight synthetic aperture radar (CF-SAR) is the inevitable result of the comprehensive practicality of SAR. The flight path of the SAR platform in real applications, which is highly nonlinear or curvy due to three-dimensional velocity and acceleration, cannot be described by the traditional uniform linear motion model. New mathematical models, signal characteristics, imaging algorithms, and system design criteria must be proposed and investigated for CF-SAR. This paper provides a comprehensive overview of CF-SAR. Firstly, the basic concept, unified model, and general signal characteristics of CF-SAR are defined, derived, and analyzed, respectively. Additionally, the advantages and drawbacks of current methodologies are reviewed. Discussions on the CF-SAR’s applications are presented from the perspective of typical platforms, new configurations, and advanced technologies, which are suitable means to fulfill the increasing user requirements. Finally, the challenges faced by CF-SAR are summarized, and some future trends for the study of CF-SAR are explored. Hopefully, this paper will serve as a reference for SAR researchers/engineers and stimulate the future development and actual application of CF-SAR.

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Section: Integration Timementioning

confidence: 99%

Curvilinear Flight Synthetic Aperture Radar (CF-SAR): Principles, Methods, Applications, Challenges and Trends

et al. 2022

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“…Generally,

π / 4

is used to be an acceptable level of phase error in order to avoid significant signal defocusing [2–4]. In addition to the radar system parameters, the phase error is related to the acceleration of the radar platform

\vec{a}

, the reference baseline

()(, i - 1) d

, and the kinetic and position parameters of the target.…”

Section: Phase Error Analysis Of Cb Range Modelmentioning

confidence: 99%

“…Actually, radar platform usually moves in a curvilinear trajectory due to the influence of acceleration, such as manoeuvring responding (e.g. missile [2]), orbital motion (e.g. satellite [3]), or long time observing [4].…”

Section: Introductionmentioning

confidence: 99%

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General range model for multi‐channel SAR/GMTI with curvilinear flight trajectory

et al. 2019

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The platform of multi-channel synthetic aperture radar/ground moving target indication (MC-SAR/GMTI) system may encounter the problem of curvilinear trajectory due to the existence of acceleration in several applications, e.g. manoeuvring responding, orbital motion, and longtime observing. The curvilinear trajectory changes the attitude of the array, which leads to instantaneous baseline changing during echo reception. Thus, the traditional constant baseline range model is no longer valid since it will introduce severe phase error. In this Letter, a general range model that it applies to both stationary and moving targets for MC-SAR/GMTI is proposed. Simulation results of the point spread functions demonstrate that the proposed model can achieve good performance.

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“…These equivalences simplify the subsequent imaging procedures and can be directly combined with the high-resolution imaging algorithms, such as Omega-K [20], [21]. Moreover, a fourth-order range model (FORM4 or DRM4 [22]), advanced hyperbolic range equation (AHRE) [23], [24], modified AHRE [25], improved range model [26], velocity equivalent model [27], and modified equivalent squint range model [28] are proposed for maneuvers with curved orbit. These models simplify the complex algebraic expression of the range model.…”

mentioning

confidence: 99%

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

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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

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Equivalent hyperbolic range model for synthetic aperture radar with curved track

Cited by 5 publications

References 7 publications

Curvilinear Flight Synthetic Aperture Radar (CF-SAR): Principles, Methods, Applications, Challenges and Trends

Curvilinear Flight Synthetic Aperture Radar (CF-SAR): Principles, Methods, Applications, Challenges and Trends

General range model for multi‐channel SAR/GMTI with curvilinear flight trajectory

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

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