Modified Range-Doppler Processing for FM-CW Synthetic Aperture Radar

Wit, J.J.M. de; Meta, Adriano; Hoogeboom, P.

doi:10.1109/lgrs.2005.856700

Cited by 137 publications

(61 citation statements)

References 6 publications

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“…Using standard interpolation methods, range cell migration (RCM) can be compensated, but this is computationally costly. The Doppler shift introduced by the continuous forward motion of the platform can also be removed [9]. Azimuth compression is performed by multiplying by the azimuth-matched filter, i.e.,…”

Section: Lfm-cw Sar Signal Processingmentioning

confidence: 99%

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Theory and Application of Motion Compensation for LFM-CW SAR

Zaugg

Long

2008

IEEE Trans. Geosci. Remote Sensing

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Abstract-Small low-cost high-resolution synthetic aperture radar (SAR) systems are made possible by using a linear frequency-modulated continuous-wave (LFM-CW) signal. SAR processing assumes that the sensor is moving in a straight line at a constant speed, but in actuality, an unmanned aerial vehicle (UAV) or airplane will often significantly deviate from this ideal. This nonideal motion can seriously degrade the SAR image quality. In a continuous-wave system, this motion happens during the radar pulse, which means that existing motion compensation techniques that approximate the position as constant over a pulse are limited for LFM-CW SAR. Small aircraft and UAVs are particularly susceptible to atmospheric turbulence, making the need for motion compensation even greater for SARs operating on these platforms. In this paper, the LFM-CW SAR signal model is presented, and processing algorithms are discussed. The effects of nonideal motion on the SAR signal are derived, and new methods for motion correction are developed, which correct for motion during the pulse. These new motion correction algorithms are verified with simulated data and with actual data collected using the Brigham Young University μSAR system.

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Section: Lfm-cw Sar Signal Processingmentioning

confidence: 99%

“…The range-Doppler algorithm (RDA) [9] and the frequency (or chirp) scaling algorithm (FSA or CSA) [10] can be modified to compensate for the constant forward motion during the FMCW chirp. Nonlinearities in the chirp can also be corrected [11], and squintmode data can be processed [12].…”

mentioning

confidence: 99%

Theory and Application of Motion Compensation for LFM-CW SAR

Zaugg

Long

2008

IEEE Trans. Geosci. Remote Sensing

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“…Therefore, conventional SAR imaging algorithms that use the stop-and-go approximation need to be modified for FMCW image processing. Several conventional algorithms, such as range-Doppler algorithm, frequency-scaling algorithm, and chirpscaling algorithm, etc., have been modified to focus the FMCW SAR data [8][9][10]. Especially, an accurate received two-dimensional (2-D) signal model was proposed in [6], in which the effect of the variation of the instantaneous slant range on the transmitted and received signal was accurately represented, and a range-azimuth coupling term was formulated for the first time in the FMCW SAR community.…”

Section: Introductionmentioning

confidence: 99%

Modified Wavenumber Domain Algorithm for Three-Dimensional Millimeter-Wave Imaging

Li¹,

Ren²,

Sun³

et al. 2012

PIER

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Abstract-Millimeter-wave (MMW) imaging techniques have been used for the detection of concealed weapons and contraband carried on personnel at airports and other secure locations. The combination of frequency-modulated continuous-wave (FMCW) technology and MMW imaging techniques should lead to compact, light-weight, and low-cost systems which are especially suitable for security and detection application.However, the long signal duration time leads to the failure of the conventional stop-and-go approximation of the pulsed system. Therefore, the motion within the signal duration time needs to be taken into account. Analytical threedimensional (3-D) backscattered signal model, without using the stop-and-go approximation, is developed in this paper.Then, a wavenumber domain algorithm, with motion compensation, is presented. In addition, conventional wavenumber domain methods use Stolt interpolation to obtain uniform wavenumber samples and compute the fast Fourier transform (FFT). This paper uses the 3-D nonuniform fast Fourier transform (NUFFT) instead of the Stolt interpolation and FFT. The NUFFT-based method is much faster than the Stolt interpolation-based method. Finally, point target simulations are performed to verify the algorithm.

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“…Therefore, the stop-and-go approximation which is used in the conventional SAR imaging algorithms needs to be modified for FMCW image processing. Several conventional algorithms, such as wavenumber domain algorithm, frequency-scaling algorithm, range-Doppler algorithm and chirp-scaling algorithm, etc., have been modified to focus the FMCW SAR data [8,[10][11][12]. In [8], an accurate two-dimensional (2-D) received signal model was presented, in which a range-azimuth coupling term was formulated for the first time in the FMCW SAR community.…”

Section: Introductionmentioning

confidence: 99%

Modified Cylindrical Holographic Algorithm for Three-Dimensional Millimeter-Wave Imaging

Ren¹,

Li²,

Sun³

et al. 2012

PIER

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Abstract-Millimeter-wave (MMW) imaging techniques have been developed for the detection of concealed weapons and plastic explosives carried on personnel at major transportation hubs and secure locations. The combination of frequency-modulated continuous-wave (FMCW) technology and MMW imaging techniques leads to wideband, compact, and cost-effective systems which are especially suitable for security detection. Cylindrical three-dimensional (3-D) imaging technique, with the ability of viewing multiple sides, is an extension of rectilinear 3-D imaging technique only viewing a single side. Due to the relatively long signal sweep time, the conventional stop-and-go approximation of the pulsed systems is not suitable for FMCW systems. Therefore, a 3-D backscattered signal model including the effects of the continuous motion within the signal duration time is developed for cylindrical imaging systems. Then, a holographic image reconstruction algorithm, with motion compensation, is presented and demonstrated by means of numerical simulations.

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Modified Range-Doppler Processing for FM-CW Synthetic Aperture Radar

Cited by 137 publications

References 6 publications

Theory and Application of Motion Compensation for LFM-CW SAR

Theory and Application of Motion Compensation for LFM-CW SAR

Modified Wavenumber Domain Algorithm for Three-Dimensional Millimeter-Wave Imaging

Modified Cylindrical Holographic Algorithm for Three-Dimensional Millimeter-Wave Imaging

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