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International Conference on Control, Automation and Systems

作者： Shin, Hee-Sub Lim, Jong-Tae Korea Adv Inst Sci & Technol Dept EECS Taejon 305701 South Korea

ISBN: (纸本)9788995003879

To obtain the SAR images with high quality in the processing of the airborne bistatic spotlight SAR systems in the spatial variant case, we propose a modified range migration algorithm (RMA) with resampling based on the extended Taylor approximation (ETA). After we analyze the azimuth positions of the transmitter and the receiver in the spatial variant case, we compensate the difference of the transmitter velocity and the receiver velocity at the mixing stage of the raw data and the reference signal. Then, the validity of the proposed algorithm is tested with some numerical simulations via a pulsed spotlight SAR simulator.

关键词： bistatic spotlight synthetic aperture radar range migration algorithm

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Knowledge-Aided 2-D Autofocus for Spotlight SAR range migration algorithm Imagery

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IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING 2018年第9期56卷 5458-5470页

作者： Mao, Xinhua He, Xueli Li, Danqi Nanjing Univ Aeronaut & Astronaut Dept Elect Engn Nanjing 211106 Jiangsu Peoples R China

With continuous improvement of the synthetic aperture radar (SAR) resolution, the 2-D defocus effect in SAR image resulting from uncompensated motion error has made autofocus become a new challenging problem. Conventional 2-D autofocus approaches assume that the 2-D phase error is absolutely unknown and estimate them directly. Due to high dimensionality of the unknown parameters, these approaches often suffer from high computational burden and low estimate accuracy. In this paper, we analyze the effect of range migration algorithm (RMA) processing on the 2-D echo phase, and reveal the analytical structure of the residual 2-D phase error in RMA imagery. Then, by exploiting the derived prior knowledge on the phase error structure, an accurate and efficient 2-D autofocus approach is proposed. In the new method, only 1-D error, e.g., azimuth phase error, or residual range cell migration, is required to be estimated directly, while the 2-D phase error is computed directly from the estimated 1-D error by exploiting the analytical structure of the 2-D phase error. The experimental results clearly demonstrate the effectiveness and robustness of the proposed method.

关键词： Autofocus range migration algorithm synthetic aperture radar

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Motion error correction of range migration algorithm for aircraft spotlight SAR imaging

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IET RADAR SONAR AND NAVIGATION 2008年第2期2卷 79-85页

作者： Shin, H. -S. Lim, J. -T. Korea Adv Inst Sci & Technol Radiowave Detect Res Ctr Korea Adv Inst Sci & Technol Taejon 305701 South Korea Korea Adv Inst Sci & Technol Dept EECS Korea Adv Inst Sci & Technol Taejon 305701 South Korea

Since a motion error is the main phase error source in the aircraft synthetic aperture radar, several reconstruction algorithms with motion error correction have been developed. An efficient motion compensation via the known motion error information is proposed. Specifically, the proposed method is based on the subarea technique with shifting and the subaperture technique via the mean values of the motion errors. Then, using the extended Taylor approximation and the principle of the stationary phase, the motion errors are corrected through compensation at the mixing stage and the Stolt interpolation stage.

关键词： aircraft spotlight SAR imaging error correction motion error correction range migration algorithm aircraft synthetic aperture radar radar imaging interpolation Stolt interpolation Optical, image and video signal processing mean values phase error source Radar equipment, systems and applications aircraft motion compensation approximation theory synthetic aperture radar subarea technique Interpolation and function approximation (numerical analysis) Taylor approximation subaperture technique

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Three-dimensional bistatic array imaging using range migration algorithm

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ELECTRONICS LETTERS 2017年第3期53卷 193-194页

作者： Guo, Qijia Zhang, Xiaoxuan Chang, Tianying Cui, Hong-Liang Tian, Xianzhong Jilin Univ Coll Instrumentat & Elect Engn Changchun Jilin Peoples R China Shandong Acad Sci Inst Automat Jinan Shandong Peoples R China

Millimetre wave imaging systems are widely used in many fields, such as non-destructive testing, security screening and medical imaging. For security-related personnel screening, the geometries of planar and cylindrical-scanning antenna arrays are often adopted. A planar array imager is capable of acquiring a three-dimensional image in real time, but the information on the back side of the object will be lost. A cylindrical scanning imager is well suited for constructing an image in full 360 degrees directions, what is lost is the time that it takes to complete a full scan. Regardless, mechanical scanning geometry is not always the best approach for real-time systems. In this letter, an imaging scenario is proposed, which is composed of two parallel arrays facing each other. Multiple input multiple output technology is applied to the pair of arrays. range migration algorithm is adapted specially for this scenario, through which nearly 360 degrees-images of high quality can be constructed in real time when an object is placed between the two arrays.

关键词： millimetre wave imaging millimetre wave antenna arrays planar antenna arrays scanning antennas three-dimensional bistatic array imaging range migration algorithm millimetre wave imaging systems security-related personnel screening planar antenna arrays cylindrical-scanning antenna arrays planar array imager three-dimensional image acquisition cylindrical scanning imager mechanical scanning geometry real-time systems parallel arrays multiple-input multiple-output technology

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Focusing Bistatic FMCW SAR Signal by range migration algorithm Based on Fresnel Approximation

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SENSORS 2015年第12期15卷 32123-32137页

作者： Li, Yake O'Young, Siu Mem Univ Newfoundland Fac Engn & Appl Sci St John NF A1C 5S7 Canada

Frequency modulated continuous wave (FMCW) technique has recently been employed by synthetic aperture radar (SAR) to decrease the radar cost and volume. However, the operation range is limited by the direct energy leakage from the transmitting channel to receiving channel due to the operation principle of FMCW technique. Bistatic configuration is an efficient way to increase the isolation between the transmitter and receiver, which could significantly increase the radar standoff range. A bistatic FMCW SAR spectrum model is proposed by using the Fresnel approximation in this paper. This model is similar to that of a monostatic FMCW SAR spectrum, which allows the existing imaging algorithms to be used on bistatic image processing. Based on the new model and the characteristics of FMCW signal, a modified range migration algorithm (RMA) for FMCW SAR is proposed to focus the image, which requires less memory and computational load than the traditional RMA. Point-target simulation is used to verify the proposed spectral model and real data processing verified the effectiveness of the proposed RMA.

关键词： bistatic FMCW SAR SAR signal spectrum range migration algorithm

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Enhanced range migration algorithm for sub-mm resolution imaging at 120 GHz 49

Enhanced Range Migration Algorithm for sub-mm resolution ima...

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49th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)

作者： Barnabe, Carre Adrien, Chopard Jean-Paul, Guillet Pierre, Gellie Lytid SAS Talence France IMS Lab Talence France Lytid SAS Montrouge France

ISBN: (纸本)9798350370331;9798350370324

A 3D close range Synthetic Aperture Radar system based on the range migration algorithm and working with an affordable and compact Si-Ge Frequency Modulated Continuous Wave radar unit operating at 120 GHz with 19.5 GHz bandwidth is presented. A new method for enhancing lateral resolution combined with a normalization procedure is proposed leading to 0.33 central wavelength resolution. Lateral resolution is compared to a focusing lens system. An object of interest is displayed to reveal Synthetic Aperture Radar advantages in term of lateral resolution and depth of field for Non Destructive Testing and inspection.

关键词： Synthetic Aperture Radar range migration algorithm Frequency Modulated Continuous Wave Non Destructive Testing Si-Ge radar

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X-Band Image Reconstruction by Modified range migration algorithm

X-Band Image Reconstruction by Modified Range Migration Algo...

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3rd Asia-Pacific Microwave Conference Proceedings (APMC)

作者： Cho, Yong-Sun Jung, Hyun-Kyo Seoul Natl Univ Dept Elect & Comp Engn Seoul South Korea

ISBN: (纸本)9781479914722

The radar imaging algorithms can be divided into three general groups as range migration algorithm (RMA), polar format algorithm (PFA) and chirp scaling algorithm (CSA). In this letter, we explore the RMA technique in X-band suitable for the strip-map mode of a synthetic aperture radar (SAR) system, and then propose a modified RMA to obtain better image resolution than is normally obtained using a conventional RMA. Finally, the reconstructed images generated using the modified RMA demonstrates that the proposed algorithm shows the better performance than a conventional RMA.

关键词： range migration algorithm Synthetic Aperture Radar

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MC-RMA: Multi-Coset range migration algorithm for near-field MIMO-SAR Imaging

MC-RMA: Multi-Coset Range Migration Algorithm for near-field...

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IEEE Sensors Conference

作者： Gigie, Andrew Kanth, R. Krishna Kumar, A. Anil Chakravarty, Tapas Pal, Arpan TCS Res Embedded Devices & Intelligent Syst Mumbai Maharashtra India

ISBN: (纸本)9798350303872

This paper addresses the important problem of near field MIMO-SAR imaging with non-uniform MIMO radar. We propose a new approach referred as Multi-Coset range migration algorithm (MC-RMA), which leverages the well known periodic block scanning of MIMO radars in RMA to create uniformly spaced multiple sub-arrays. These sub-arrays are formed by combining corresponding elements across this periodic block scan, and the elements in these sub-arrays are uniformly spaced despite the non-uniformity of the MIMO radar. By visualizing them as decimated and translated versions of a larger array, a closed-form expression connecting their Fourier transforms (FT) and the FT of the larger non-uniform array is derived. Unlike existing methods, MC-RMA requires computation of smaller dimensional FFTs making it more deployment friendly. Further, experimental results are presented which demonstrate a significant improvement in image reconstruction with reduced computation compared to state-of-the-art methods.

关键词： MIMO-SAR Non-uniform array Near-field radar Imaging range migration algorithm Multi-coset sampling

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range migration algorithm for Near-field SIMO Array imaging 30

Range Migration Algorithm for Near-field SIMO Array imaging

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Asia-Pacific Microwave Conference (APMC)

作者： Zhu, Rongqiang Zhou, Jianxiong Fu, Qiang Natl Univ Def Technol ATR Lab Changsha 410073 Hunan Peoples R China

ISBN: (纸本)9784902339451

In this paper, a range migration algorithm for single-input multiple-output array imaging is presented. Similar to the range migration algorithm in synthetic aperture radar imaging, the proposed method first transforms the measurement data into the wavenumber domain to interpolate. Due to the multistatic configuration, the interpolation used here is different to that in synthetic aperture radar. After interpolation, the imaging result is obtained by accumulation and inverse Fourier transform. Since the curvature of the wavefront is completely compensated and the Fourier transform based imaging scheme is utilized, the method can be applied under the near-field condition and has high imaging efficiency. The experiment data validate its performance.

关键词： range migration algorithm single-input multiple-output array near-field imaging Fourier transform

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A NOVEL range migration algorithm OF GEO SAR ECHO DATA 30

A NOVEL RANGE MIGRATION ALGORITHM OF GEO SAR ECHO DATA

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30th IEEE International Geoscience and Remote Sensing Symposium (IGARSS) on Remote Sensing - Global Vision for Local Action

作者： Liu, Feifeng Hu, Cheng Zeng, Tao Long, Teng Jin, Lihua Beijing Inst Technol Dept EE Beijing 100081 Peoples R China Chinese Acad Space Technol Ctr Res & Dev Beijing 100094 Peoples R China

ISBN: (纸本)9781424495665

The key problem of the imaging processing in geosynchronous earth orbit (GEO) SAR system is the space-variance of the Doppler parameters, which will result in the defocus of the SAR image with classical imaging algorithm. In this paper, a Modified range migration algorithm (RMA) is proposed to overcome the space-variance of Doppler parameters by compensating the velocity change along the location of the target. Furthermore the simulation results fully verify the effectiveness of derived algorithm after velocity compensation.

关键词： GEO SAR range migration algorithm space-variance of the Doppler parameters

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