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Moving Ship Target 3D Reconstruction with the Single Antenna SAR

TANG Li-bo,LI Dao-jing,WU Yi-rong,

遥感学报 , 2007,
Abstract: The single antenna SAR moving ship targets 3D reconstruction is investigated based on high resolution airborne SAR. The range migration correction is completed by KEYSTONE transform and phase polynomial compensation. Time-frequency analysis imaging method can give a sequence of 2D ship images. Then, we introduce the factorization method to SAR image processing field. From these 2D images sequences, the 3D shape of ship targets can be reconstructed by factorization method. The imaging results of real SAR data show the effectiveness of this method.
A Fast 3D Imaging Technique for Near-Field Circular SAR Processing
Wei Yan;Jia-Dong Xu;Gao Wei;Li Fu;Hua-Bing He
PIER , 2012, DOI: 10.2528/PIER12051704
Abstract: A fast method for circular SAR three-dimensional imaging system by near-field elevation scanning is proposed in this paper. It is based on cylindrical spectrum theory which exploits the Fourier decomposition of the targets distribution instead of point by point imaging in earlier works. The proposed method sets up the relationship between the target image and the scattering field in spatial frequency domain. This leads to overcome the problem of computational inefficiency which was observed previously in projection-slice theorem. The near-field scattering is firstly analyzed by relating the return signal to the near-field focus function. The near-field focus function is then transformed to spatial frequency domain and evaluated by the method of stationary phase. Finally, the imaging result is given by three-dimensional inverse Fourier transformation from spatial frequency domain of targets. The proposed method is validated by the simulation results of distributed targets. In addition, experimental validation was also achieved in microwave chamber at X-band with targets placed on the turntable.
Pseudo-Zernike Based Multi-Pass Automatic Target Recognition From Multi-Channel SAR  [PDF]
Carmine Clemente,Luca Pallotta,Ian Proudler,Antonio De Maio,John J. Soraghan,Alfonso Farina
Computer Science , 2014,
Abstract: The capability to exploit multiple sources of information is of fundamental importance in a battlefield scenario. Information obtained from different sources, and separated in space and time, provide the opportunity to exploit diversities in order to mitigate uncertainty. For the specific challenge of Automatic Target Recognition (ATR) from radar platforms, both channel (e.g. polarization) and spatial diversity can provide useful information for such a specific and critical task. In this paper the use of pseudo-Zernike moments applied to multi-channel multi-pass data is presented exploiting diversities and invariant properties leading to high confidence ATR, small computational complexity and data transfer requirements. The effectiveness of the proposed approach, in different configurations and data source availability is demonstrated using real data.
Operation Mode of Circular Trace Scanning SAR for Wide Observation

Sun Bing Zhou Yin-qing Chen Jie Li Chun-sheng,

电子与信息学报 , 2008,
Abstract: Circular Trace Scanning Synthetic Aperture Radar (CTS-SAR) is a new operation mode radar, which can be used for wide observation. CTS-SAR have the characteristic of high time-space resolution, short repetition visit period and wide observation area. It can observe wide area in a short time with great efficiency for slow platform specially. The moving model and range model of CTS-SAR are advanced, and the Doppler characteristic and azimuth resolution characteristic of CTS-SAR are analyzed base on the above models. Then the imaging method of CTS-SAR is discussed. The computer simulation results validate the analyzed conclusions and the imaging method. CTS-SAR is competent for wide observation.
Pepeat-pass interferometry with airborne synthetic aperture radar

Shi Ruirong,Jing Linjiao,Song Fuming,Shen Ting,Li Jianxiong,

电子与信息学报 , 2003,
Abstract: In this paper, the interferomtric experiments on airborne L-SAR system of IECAS is demonstrated. And data obtained from experiments are processed, and Chinese first DEM with repeat-pass airborne SAR, which nearly accords with the real topographic map, is obtained, and its height accuracy is about 10m. A new imaging coregistration method for crossed-orbit is presented and its effectiveness is tested by airborne data.
An image formation algorithm for missile-borne circular-scanning SAR
Yesheng Gao, Kaizhi Wang and Xingzhao Liu
EURASIP Journal on Advances in Signal Processing , 2013, DOI: 10.1186/1687-6180-2013-2
Abstract: Circular-scanning SAR is an imaging mode with its antenna beam rotating continuously with respect to the vertical axis. An image formation algorithm for the missile-borne circular-scanning SAR is proposed in this article. Based on the principle of the polar format algorithm, the focus algorithm is generalized to form each subimage when the antenna beam scans at an arbitrary position. By calculating the 2-D position of each calibration point between the scatterers and the subimages, a method is presented to correct the geometric distortion of each subimage. This method is able to correct the geometric distortion even in the case of high maneuvering. These subimages are then mosaicked together to form a circular image. The simulation results under three different maneuvering trajectories are given, the subimages are formed by the focusing algorithm, and then the final circular image can be formed by mosaicking 71 subimages, each of which is after geometric distortion correction. The simulations validate the proposed image formation algorithm, and the results satisfy system design requirements.
Urban Target Monitoring Using High Resolution SAR Data

ZHANG Feng-li,SHAO Yun,

遥感技术与应用 , 2010,
Abstract: High-resolution Synthetic Aperture Radar (SAR) satellites will provide valuable data for urban area monitoring and promote the identification of urban targets greatly,because targets take on multi-dimension characteristics in high\|resolution SAR images.Nevertheless,urban targets become very complicated in high-resolution SAR images due to the spatial complexity of urban targets,multi-bounce scattering between adjacent targets,as well as the inherent geometric distortions and speckle noises of SAR imaging.In this paper,literature was reviewed surrounding electromagnetic scattering and SAR imaging mechanisms,fine structure extraction and 3D reconstruction of urban targets,and future research focus of this domain was analyzed.
3D imaging algorithm for multi-baseline SAR based on QR decomposition

WANG Bin,WANG Yan-Ping,HONG Wen,

中国科学院研究生院学报 , 2011,
Abstract: Based on the signal model of multi-baseline synthetic aperture radar (MB-SAR), the matrix function between the observed samples and the image in the height direction is obtained, and QR decomposition is used to solve the matrix equation.The 3D imaging algorithm based on QR decomposition for MB-SAR is established, and the simulation results are presented.
Experimental study on repeat-pass alrborne sar interferometry

Wang Lei,Peng Hailiang,

电子与信息学报 , 2002,
Abstract: This paper describes the experimental study on repeat-pass airborne SAR interfcr-ometry. The key technologies include airline control of aircraft, baseline determination, motion compensation and signal processing. In this paper a motion compensation method based on INS/GPS data has been proposed and implemented. An interpolation approach in range and azimuth dimensions is used to eliminate the effect of non-parallel baseline on correlation. Some resultant interferograms demonstrate the validity of the interferometric L-SAR.
Distributed Micro-satellites SAR Orbit Design and Ambiguity Function Analysis

Zuo Yan-jun,Yang Ru-liang,

电子与信息学报 , 2007,
Abstract: sing on satellite trajectories, the formula of formation flying orbit elements is derived. The imaging geometric model of distributed satellites SAR is presented and the ambiguity function of distributed satellites SAR is analyzed. Moreover, a design example of the space circular formation flying is given. According to the design result, the ambiguity function simulations of distributed satellites SAR with different formation configurations and different satellites are developed. The relation between satellites formation configurations, number and ambiguity function is studied, and it is theory basis of following imaging algorithm research.
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