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Deng Yun-kai, Robert Wang |
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Exploration of Advanced Bistatic SAR Experiments (in English) Hot! |
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This study concentrates on the results of several advanced hybrid bistatic SAR experiments. The hybrid bistatic configuration applies to the case in which the transmitter and receiver are mounted on different types of platforms, e.g., spaceborne/airborne, airborne/stationary, spaceborne/stationary, and so on. Several hybrid bistatic SAR experiments have been performed successfully, i.e., TerraSAR-X/PAMIR, PAMIR/stationary, and TerraSAR-X/stationary. Furthermore, Multiple Baseline Interferometry SAR (MB-InSAR) and Digital Beam-Forming (DBF) technologies are validated in the TerraSAR-X/stationary configuration. Note that the DBF experiment results based on the spaceborne illuminator are discussed for the first time in SAR community. In addition, this paper emphasizes imaging geometry, image analysis, and focusing results.
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2014 Vol. 3 (1): 1-9
[Abstract]
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1756
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[PDF 8153KB]
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2839
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10 |
Zhou Wei, Liu Yong-xiang, Li Xiang, Ling Yong-shun |
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Brief Analysis on the Development and Application of Multi-Input Multi-Output Synthetic Aperture Radar |
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Recently, a novel conception of Synthetic Aperture Radar (SAR) based on Multi-Input Multi-Output (MIMO) technology draws much attention for its potential advantages. MIMO-SAR could obtain much more equivalent channels than the number of the physical array elements by simultaneously utilizing multiple antennas at transmission and reception. These additional channels are demonstrated to be useful for the application of High-Resolution Wide-Swath (HRWS) imaging and slowly moving target indication. In this paper, a detailed discussion on the conception and connotation of MIMO-SAR is made firstly, and then the investigation states of MIMO-SAR, such as high range resolution SAR imaging, three-dimensional down-looking SAR imaging, HRWS imaging and Ground Moving Target Indication (GMTI), are discussed. Base on the discussion mentioned above, the advantages and disadvantages of MIMO-SAR system are analyzed, and the key technical issues in MIMO-SAR are summarized. At last, the prospects of MIMO-SAR application are pointed out.
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2014 Vol. 3 (1): 10-18
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2216
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[PDF 1301KB]
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3878
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19 |
Shi Jun, Ma Long, Wei Shun-jun, Shi Dai-qi, Zhang Xiao-ling, Chen Gang |
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Ka-band InSAR Imaging and Analysis Based on IMU Data Hot! |
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Compared with other bands, the millimeter wave Interferometric Synthetic Aperture Radar (InSAR) has high accuracy and small size, which is a hot topic in InSAR research. On the other hand, shorter wavelength causes difficulties in 2D imaging and interferometric phase extraction. In this study, the imaging and phase performance of the streaming Back Projection (BP) method combined with IMU data are analyzed and discussed on the basis of actual Ka-band InSAR data. It is found that because the wavelength of the Ka-band is short, it is more sensitive to the antenna phase-center history. To ensure the phase-preserving capacity, the IMU data must be used with accurate motion error compensation. Furthermore, during data processing, we verify the flat-earth-removing capacity of the BP algorithm that calculates and compensates the master and slave antenna phase centers individually.
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2014 Vol. 3 (1): 19-27
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1415
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[PDF 6461KB]
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2471
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35 |
Wang Shuang, Yu Jia-ping, Liu Kun, Hou Biao, Jiao Li-cheng |
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Polarimetric SAR Speckle Reduction Based on Bilateral Filtering |
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The priority during speckle reduction in Polarimetric Synthetic Aperture Radar (Pol-SAR) data is to maintain the polarization information. For this reason, it is undesirable to separate each element of polarimetric SAR. Based on the multiplicative noise model and complex matrix, an effective distance similarity measure method is derived, which can process covariance matrix C or coherent matrix T directly. Experiments show that this method can effectively reduce speckle and maintain the polarization information, point targets, and texture structure. Moreover, it can handle large polarimetric SAR with simplicity and ease.
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2014 Vol. 3 (1): 35-44
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1052
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[PDF 7402KB]
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1876
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45 |
Zhao Ning, Zhou Fang, Wang Zhen, Xing Meng-dao, Ge Jia-long, Lu Jia-guo |
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Ground Observation and Correction of P-band Radar Imaging Ionospheric Effects |
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For high resolution space-borne P-band SAR system, ionospheric effects could cause serious phase errors. These errors are causally related to the radar frequency and the TEC of ionosphere and make the image quality degraded. To guarantee the image quality, the ionosphere errors must be emended. Based on the mismatched filter model caused by ionosphere, it is pointed out that accurate ionosphere TEC is the key for phase error correction, a high precision ionosphere TEC measurement method is further put forward by using the phase errors of SAR echoes, which is validated by processing the data of a ground based P-band radar with well focused radar image of the international space station obtained. The results indicate that the method can effectively increase the accuracy of ionosphere TEC estimation, and thus improve the radar imaging quality, it is applicable to low frequency space-borne SAR systems for reducing the ionosphere effects.
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2014 Vol. 3 (1): 45-52
[Abstract]
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1341
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[PDF 2118KB]
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2836
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61 |
Tian Yu-run, Yu Wei-dong, Xiong Ming-nan |
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Observation Properties Analysis of Geo-SAR with Attitude Steering |
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Attitude Steering has been widely applied to the current low orbit SAR system to decrease the rang/azimuth coupling of the received data. This paper focuses on the impacts of attitude steering to the observation properties of Geo-SAR, namely, Doppler parameters, range swath, and rang cell migration effect, and a comparisonbetween 3 different ways of attitude steering is made. Based on the simulation results, the necessity of attitude steering for Geo-SAR is validated, and for Geo-SAR on elliptical orbit, 2D attitude steering is the most effective.
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2014 Vol. 3 (1): 61-69
[Abstract]
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1057
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[PDF 3580KB]
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2247
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