Generalized Frequency Scaling and Backprojection for LFM-CW SAR Processing

Zaugg, Evan C.; Long, D.G.

doi:10.1109/tgrs.2014.2380154

Cited by 51 publications

(51 citation statements)

References 17 publications

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“…The 3D matched filtering is aided by formulating the SAR backprojection algorithm in strictly spatial variables [4,13]. Ignoring apodization windows and the 1/R 4 slant range dependence, 3D backprojection formulated in spatial variables can be expressed as [4] v…”

Section: Methodsmentioning

confidence: 99%

Ground-Based 3D Radar Imaging of Trees Using a 2D Synthetic Aperture

Penner

Long

2017

Electronics

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Motivated by the desire to gain insight into the details of conventional airborne synthetic aperture radar (SAR) imaging of trees, a ground-based SAR system designed for short-range three-dimensional (3D) radar imaging is developed using a two-dimensional (2D) synthetic aperture. The heart of the system is a compact linear frequency modulation-continuous wave (LFM-CW) radar, a custom two-dimensional scan mechanism, and a three-dimensional time-domain backprojection algorithm that generates three-dimensional backscatter images at an over-sampled resolution of 10 cm by 10 cm by 10 cm. The backprojection algorithm is formulated directly in spatial coordinates. A new method for estimating and compensating for signal attenuation within the canopy is used that exploits the backprojection image formation approach. Several three-dimensional C-band backscatter images of different individual trees of multiple species are generated from data collected for trees both in isolation and near buildings. The trees imaged in this study are about 10 m in height. The transformation of the three-dimensional images to airborne SAR images is described and a sample result provided.

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Section: Methodsmentioning

confidence: 99%

Ground-Based 3D Radar Imaging of Trees Using a 2D Synthetic Aperture

Penner

Long

2017

Electronics

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“…FMCW-SAR 시스템에서 고려되어야 할 연속이동효과 는 레이다 신호 송․수신 과정에도 안테나의 위치가 지 속적으로 이동하는 것으로, 기존에 안테나 위치를 정지된 위치로 근사화시킨 'start-stop' 근사기법만으로 그 처리가 부족한 측면이 있다 [5], [10] . 이를 보완하기 위해서 시간에 따른 안테나 위치 변화를 항공기 이동 속도(v r )와 측정 시 간(sweep time)을 고려해 식 (5)와 같이 수정하였다.…”

Section: -2 연속이동효과(Continuous Motion Effect) 신호 모델unclassified

Correction of Continuous Motion Effects for Airborne FMCW-SAR System

Hwang¹,

Jung²,

Kim³

et al. 2017

J. Korean Inst. Electromagn. Eng. Sci.

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Results of an analysis of the continuous motion effect for FMCW-SAR system and a signal processing to correct it are presented in this paper. SAR images reconstructed by back-projection algorithm are included as well. To analyze how platform velocity and sampling frequency affect the continuous motion effect, FMCW signal model was used, and the signal processing in time-doppler(t, k u ) domain was adopted. Then, back-projection algorithm and modified matched-filter was used to reconstruct SAR images, and it was validated using measured data by airborne FMCW-SAR system in X-band frequency.Key words: FMCW-SAR, Continuous Motion Effect, Back-Projection, Airborne System, X-Band Frequency . 특히, FMCW 신호기반의 SAR 시스템은 동일한 변조 주기에서 레이다 신호의 송․수신이 연속적으로 이루어 지는 특징이 있어, 시스템 구성에 따라 상대적으로 송․ 수신 안테나의 연속이동효과(continuous motion effect)가 두드러지는 문제가 있다 [5] . 이는 항공기 기반 시스템의 SAR ⓒ

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“…Another difference of FMCW SAR from pulsed SAR is the longer pulse length, which allows the Doppler shift inside the pulse to be measurable and compensable. The major pulsed SAR processing algorithms have been modified and applied in FMCW SAR signal processing [8][9][10][11] .…”

Section: Introductionmentioning

confidence: 99%

A Modified Range Migration Algorithm for FMCW SAR Signal Processing

Young²

2019

Rem Sens

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<p class="AbstractText"><span lang="EN-AU">The range migration algorithm (RMA) is an accurate imaging method for processing synthetic aperture radar (SAR) signals. However, this algorithm requires a big amount of computation when performing Stolt mapping. In high squint and wide beamwidth imaging, this operation also requires big memory size to store the result spectrum after Stolt mapping because the spectrum will be significantly expanded. A modified Stolt mapping that does not expand the signal spectrum while still maintains the processing accuracy is proposed in this paper to improve the efficiency of the RMA when processing frequency modulated continuous wave (FMCW) SAR signals. The modified RMA has roughly the same computational load and required memory size as the range Doppler algorithm (RDA) when processing FMCW SAR data. In extreme cases when the original spectrum is significantly modified by the Stolt mapping, the modified RMA achieves better focusing quality than the traditional RMA. Simulation and real data are used to verify the performance of the proposed RMA.</span></p>

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Generalized Frequency Scaling and Backprojection for LFM-CW SAR Processing

Cited by 51 publications

References 17 publications

Ground-Based 3D Radar Imaging of Trees Using a 2D Synthetic Aperture

Ground-Based 3D Radar Imaging of Trees Using a 2D Synthetic Aperture

Correction of Continuous Motion Effects for Airborne FMCW-SAR System

A Modified Range Migration Algorithm for FMCW SAR Signal Processing

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