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检索条件"主题词=Back-projection Algorithm"

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Impact of motion estimation errors on DVB-S based passive ISAR imaging

Impact of motion estimation errors on DVB-S based passive IS...

引用

IEEE Radar Conference (RadarConf)

作者： Santi, Fabrizio Pisciottano, Iole Pastina, Debora Cristallini, Diego Sapienza Univ Rome Dept Informat Engn Elect & Telecommun DIET Rome Italy Fraunhofer Inst High Frequency Phys & Radar Tech D-53343 Wachtberg Germany

ISBN: (纸本)9781728153681

This work explores the effects of inaccuracies on the rotation motion estimation on DVB-S based passive ISAR images focused via back-projection algorithm (BPA). BPA can produce images in a target fixed reference system, thus giving rise to the possibility of directly extracting relevant geometrical features from the ISAR products, such as target width and length;moreover, as the support region does not depend on the particular geometry/frequency, it is suitable for comparing/fusing image products achieved on different channels (even distributed and/ or operating on different bands). However, as the exploitation of satellite illuminators can complicate the target motion estimation task, the focusing must deal with inaccurate target kinematics information. In this work, after deriving the theoretical PSF, we derive the image pulse response under estimation errors on the yaw, pitch, and roll motions. Moreover, consequently distortions affecting the image are evaluated via closed-form equations. The theoretical findings are confirmed by experimental data analysis using a passive radar receiving system developed by FHR and an Astra satellite as opportunistic illuminator.

关键词： passive radar passive ISAR DVB-S based passive ISAR back-projection algorithm motion estimation error

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A special operation mode of BoomSAR in application to foliage penetration imaging

A special operation mode of BoomSAR in application to foliag...

引用

CIE International Conference on Radar

作者： Sun, Hongbo Liu, Weixian Lu, Yilong Borderies, Pierre Lemaitre, Francois Tai, Ling Chiat Seah, Heong Wann Chan, Hian Lim Nanyang Technol Univ Temasek Labs Singapore Singapore Off Natl Etudes & Recherches Aerosp Lannion France Def Sci & Technol Agcy Singapore Singapore

ISBN: (纸本)9780780395824

BoomSAR system is a SAR device embarked in the basket of a boomlift, which provides a cheap and flexible platform to evaluate the performance of radar system and signal processing algorithm, especially for foliage penetration imaging. The common BoomSAR system moves along a straight fine to produce the synthetic aperture effect. This paper introduces a special operation mode of BoomSAR, where the rotation of boomlift arm is adopted to form a curving synthetic aperture trajectory. The experimental results show the feasibility and effectiveness of this special operation mode in application to foliage penetration imaging and the theoretical resolution performance is achieved.

关键词： foliage penetration radar BoomSAR back-projection algorithm

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3D tomography for multistatic GPR subsurface sensing 22

3D tomography for multistatic GPR subsurface sensing

引用

Conference on Radar Sensor Technology XXII

作者： Pereira, Mauricio Zhang, Yu Orfeo, Dan Burns, Dylan Huston, Dryver Xia, Tian Univ Vermont Sch Engn Burlington VT 05405 USA Aptiv PLC Agoura Hills CA 91301 USA

ISBN: (纸本)9781510617780

Ground penetrating radar (GPR) subsurface sensing is a promising nondestructive evaluation (NDE) technique for inspecting and surveying underground utilities in complex urban environments, as well as for monitoring other key infrastructure such as bridges and railroads. A challenge of such technique lies on image formation from the recorded GPR data. In this work, a fast back projection algorithm (BPA) for three-dimensional GPR image construction is explored. The BPA is a time-domain migration method that has been effectively used in GPR image formation. However, most of the studies in the literature apply a computationally intensive BPA to a two-dimensional dataset under the assumption that an in-plane scattering occurs underneath the GPR antennas. This assumption is not precise for 3D GPR image formation as the GPR radiation scatters in multiple directions as it reaches the ground. In this study, a generalized form for an approximation to determine the scattering point in an air-coupled GPR system is developed which considerably reduces the required computations and can accurately localize the scattering point position. The algorithm is evaluated by applications on GPR data synthesized using GprMax, a finite-difference time domain (FDTD) simulator.

关键词： back-projection algorithm ground penetrating radar migration tomographic reconstruction

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Wide-field circular SAR imaging: 2D imaging results for simulation data

Wide-field circular SAR imaging: 2D imaging results for simu...

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6th International Conference on Recent Advances in Space Technologies (RAST)

作者： Demirci, Sevket Yigit, Enes Ozdemir, Caner Mersin Univ Dept Elect & Elect Engn Mersin Turkey

ISBN: (纸本)9781467363969;9781467363952

Circular synthetic aperture radar (CSAR) systems collect data over circular trajectories. Due to the curved, wide-angle geometry, focusing of CSAR data is known to be a difficult process. Additionally, when the spatial extent of the scene to be imaged is a significant fraction of the SAR path radius (i.e. in wide-field scenarios), layover phenomenon occurs which may further limit successful imaging of targets. In this paper, to characterize these layover effects, various simulation results for wide-field single-pass CSAR geometry are presented under point scattering assumption.

关键词： Circular synthetic aperutre radar (CSAR) synthetic aperture radar (SAR) near-field scattering back-projection algorithm

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BISTATIC SAR RAW DATA ACQUISITION AND IMAGING WITH GPS TIME-SYNCHRONIZED DUAL ECHO-SAR SYSTEMS

BISTATIC SAR RAW DATA ACQUISITION AND IMAGING WITH GPS TIME-...

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IEEE International Geoscience and Remote Sensing Symposium (IGARSS)

作者： Hwang, Ji-Hwan Song, Jung-Hwan Choi, Kwang Ho Choi, Hansol Kim, Bo Ra Jung, Chul H. Maeng, Seong Joo Lee, Jae Wook Echo Sensing Inc Radar Res Ctr Seoul South Korea Korea Aerosp Univ Dept Elect & Informat Engn Goyang South Korea

ISBN: (纸本)9798350360332;9798350360325

A bistatic SAR(synthetic aperture radar) system based on GPS(global positioning system) time synchronization module is proposed in this study. To configure a bistatic SAR system, two GPS time-synchronized SAR transceivers are operated as a moving transmitter and a stationary receiver, respectively. The GPS time synchronization module generates a reference clock of 10MHz and a trigger signal to control the time synchronization of both SAR transceivers for data acquisition. To implement the proposed method, the experimental device consisting of a ready-made GPS-DO(GPS disciplined oscillator) and a self-manufactured GTSM(GPS time synchronization module) was added to the Echo-SAR system, which is a chirp pulse-based radar transceiver. These synchronization modules make it possible to temporally synchronize two same SAR transceivers separated physically. To reconstruct a bistatic SAR image, optimum synchronization parameters were extracted from raw data collected through a field campaign, and an optimized procedure of bistatic SAR signal processing based on the back-projection algorithm was established.

关键词： bistatic SAR GPS time synchronization Echo-SAR back-projection algorithm

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3D Absorbed Dose Reconstructed in the Patient from EPID Images for IMRT and VMAT Treatments

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IUPESM World Congress on Medical Physics and Biomedical Engineering

作者： Younan, Fouad Mazurier, Jocelyne Chatrie, Frederic Barbeiro, Ana Rita Berry, Isabelle Franck, Denis Franceries, Xavier Clin Pasteur Serv Radiotherapie Grp Oncorad Garonne 1 Rue Petite Vitesse F-31300 Toulouse France INSERM UMR 1214 TONIC Toulouse NeuroImaging Ctr F-31059 Toulouse France Univ Toulouse III Paul Sabatier UMR 1214 F-31059 Toulouse France INSERM UMR 1037 CRCT F-31000 Toulouse France Univ Toulouse III Paul Sabatier UMR 1037 CRCT F-31000 Toulouse France CNRS LAAS F-31000 Toulouse France CHU Rangueil Dept Nucl Med 1 Ave Prof Jean Poulhes F-31400 Toulouse France

ISBN: (纸本)9789811090233;9789811090226

A back-projection method has been used in this study to reconstruct the 3D absorbed dose matrix in the patient from EPID images for IMRT and VMAT fields. Images were acquired with the Clinac 23iX aS-1000 imager (Varian) and a 6 MV beam. Then a calibration step was performed to transform the grey levels of the pixels into absorbed dose in water via a response function. Correction kernels were also used to correct for the scatter within the EPID. The dose was then back-projected into the patient for all EPID parallel planes for each gantry angle. Finally the total dose was obtained by summing the 3D dose associated for each gantry angulation. First, the 3D dose reconstruction algorithm was tested for 20 IMRT and VMAT prostate and head and neck treatments in a homogeneous cylindrical phantom. Then the algorithm was used for IMRT brain cancer plans on 20 real patients. The EPID reconstructed 3D dose distributions were then compared to the planned dose from TPS (Treatment Planning System, Eclipse Varian) with a 3D global gamma index of 3% and 3 mm criteria. The percentage of points of which the gamma index was larger than unity was greater than 97% for all IMRT treatments both in the phantom and in the patients and over 96% for all VMAT treatments checked in the cylindrical phantom. Our 3D reconstruction algorithm, validated for homogeneous medium, can be used to verify the dose distribution for IMRT and VMAT fields using in vivo EPID images.

关键词： Epid back-projection algorithm 3D absorbed dose Dose verification In vivo dosimetry

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ABOUT FOURIER TECHNIQUES IN SPOTLIGHT SAR PROCESSING

ABOUT FOURIER TECHNIQUES IN SPOTLIGHT SAR PROCESSING

引用

1991 INTERNATIONAL GEOSCIENCE AND REMOTE SENSING SYMP - REMOTE SENSING : GLOBAL MONITORING FOR EARTH MANAGEMENT ( IGARSS 91 )

作者： DENDAL, D Electronic Department of Montefiore Institute of Electricity University of Liège Liege Belgium

ISBN: (纸本)0879426756

A description is given of Fourier reconstruction techniques in the Spotlight synthetic aperture radar (SAR) domain. The particular disposition of the Fourier data in this scanning mode does not make straightforward the fast Fourier processing and raises some fundamental interrogations. Other specific aspects are also treated, such as the consequences of a frequency shift or mixing in the Fourier plane. A Fourier data extrapolation attempt is discussed. Besides the processing descriptions and theoretic discussions, Spotlight scanning properties are emphasized by the many simulation results obtained from the convolution back-projection algorithm, adapted to the Spotlight context in harmony with the tomographic analogy of radar principles.

关键词： FOURIER TECHNIQUES SPOTLIGHT SAR TOMOGRAPHIC FORMULATION back-projection algorithm

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The Millimeter-wave Imaging of Concealed Objects

The Millimeter-wave Imaging of Concealed Objects

引用

IEEE International Symposium on Antennas and Propagation (APSURSI)/USNC/URSI National Radio Science Meeting

作者： Cetinkaya, Harun Kizilhan, Ahmet Vertii, Alexey Demirci, Sevket Yigit, Enes Ozdemir, Caner TUBITAK Marmara Res Ctr Mat Inst Kocaeli Turkey Mersin Univ Dept Elect Elect Engn Mersin Turkey

ISBN: (纸本)9781424495610

In this study, two different applications are performed. An application of concealed object detection is firstly studied through millimeter-wave inverse synthetic aperture radar (ISAR) imaging. For this purpose, near-field W-band ISAR measurements of one centimeter metallic and dielectric cube targets covered by distinct textile materials are carried out in an anechoic chamber room. Then, the images are reconstructed by using back-projection ISAR imaging technique. Then, the performance of the technique is quantified from the resulted images by using the accuracy and quality metrics. An application of a concealed weapon is also handled using millimeter-wave tomography imaging. The tomography imaging of concealed weapon located behind styropor foam wall is performed. Then, the images are reconstructed by using a method which calculates polarization currents on the object surface. The results obtained are finally shown.

关键词： component Millimeter-wave imaging ISAR concealed object imaging back-projection algorithm tomography imaging

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Time-shifting correction in optoacoustic tomographic imaging for media with non-uniform speed of sound

Time-shifting correction in optoacoustic tomographic imaging...

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Conference on Novel Biophotonic Techniques and Applications

作者： Dean-Ben, X. Luis Ntziachristos, Vasilis Razansky, Daniel Tech Univ Munich Inst Biol & Med Imaging Ingolstadter Landstr 1 D-85764 Neuherberg Germany Helmholtz Ctr Munich D-85764 Neuherberg Germany

ISBN: (纸本)9780819486875

An analysis of the time-shifting correction in optoacoustic tomographic reconstructions for media with an a priori known speed of sound distribution is presented. We describe a modification of the filtered back-projection algorithm, for which the absorbed optical energy at a given point is estimated from the value of the measured signals at the instant corresponding to the time-of-flight between such point and the measuring points. In the case that a non-uniform speed of sound distribution does exist, we estimate the time-of-flight with the straight acoustic rays model, for which acoustic waves are assumed not to change direction as they propagate. The validity of this model is analysed for small speed of sound variations by comparing the predicted values of the time-of-flight with the ones estimated considering the refraction of the waves. Experimental results with tissue-mimicking agar phantoms with a higher speed of sound than water showcase the effects of the time-shifting of the optoacoustic signals caused by the acoustic mismatch. The performance of the time-shifting correction relates to the optoacoustic imaging of biological tissues, for which the speed of sound variations are usually lower than 10%.

关键词： Optoacoustic tomography back-projection algorithm heterogeneous speed of sound

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BP-Based Matrix Completion for Near-Field MIMO Array Imaging 36

BP-Based Matrix Completion for Near-Field MIMO Array Imaging

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第36届中国控制会议

作者： Liechen Yu Xiongjun Wu National Defense Key Laboratory of Science and Technology on Electromagnetic Scattering The 802 Institute of Shanghai Academy of Space Flight TechnologyThe Eighth Academy of China Aerospace Science and Technology Corporation

ISBN: (纸本)9781538629185

The near-field array-based imaging radar systems have been widely used for concealed weapon detection,medical imaging,***,traditional systems always require a large number of real antenna elements,which increase the cost and complexity of the *** paper firstly introduces an optimization method for near-field MIMO array design referring to the convolution *** antenna elements of the MIMO array are sparse which can obviously decrease the cost and complexity of the *** back-projection（BP） algorithm is usually used for the MIMO radar imaging,which is a time-consuming ***,the paper presents a fast imaging algorithm which combines matrix completion with *** completion is a new technique which can be applied to recover a low-rank matrix from a subset of the matrix *** are provided to demonstrate the performance of the proposed algorithm,which proves that it is an effective way to solve the near-field sparse MIMO array imaging problem in a fast speed.

关键词： Near-field MIMO array back-projection algorithm Matrix completion

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