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| 1 | An improved OFDM chirp waveform used for MIMO SAR system显示文摘Special attention has been devoted to multi-input multi-output(MIMO)synthetic aperture radar(SAR)systems in recent years.The applications of MIMO SAR systems which involve 3D imaging,highresolution wide-swath remote sensing,and multi-baseline interferometry are seriously limited to the orthogonal waveforms.Although orthogonal frequency division multiplexing(OFDM)chirp waveforms can be used for MIMO SAR systems to avoid intra-pulse interferences,there is a small frequency shift between the transmitted OFDM pulses.This vulnerable shift,which can not only affect the waveform orthogonality,but also introduce residual phase error,renders the OFDM waveforms impractical.In this paper,an improved OFDM chirp waveform which works without the mentioned shift is presented,along with the novel modulation and efficient demodulation procedures.Comparison between the improved and the conventional OFDM chirp waveforms is detailed.The influence of random noise,quantization error,and Doppler shift on the orthogonality of OFDM waveform is also investigated in this paper.Theoretical analysis and simulation results illustrate the feasibility of this waveform scheme. | WANG Jie LIANG XingDong DING ChiBiao CHEN LongYong ZHOU LiangJiang DONG YongWei | 2014 | Science China(Information Sciences)2014，57，6： | 6 |
| 2 | A New Approach to Airborne High Resolution SAR Motion Compensation for Large Trajectory Deviations显示文摘 | MENG Dadi HU Donghui DING Chibiao | 2012 | Chinese Journal of Electronics2012，21，4： | 5 |
| 3 | A multicomponent micro-Doppler signal decomposition and parameter estimation method for target recognition显示文摘Dear editor,The micro-Doppler modulation caused by the rotors on an unmanned aerial vehicle(TJAV)can be employed to recognize the UAV.However,several rotors on a UAV,as well as multiple targets at the same scene,lead to a multicomponent micro-Doppler signal in the radar echo.Conventional signal decomposition is an important method for extraction of the features from micro-Doppler signals [1].although it is incapable of separating characteristic curves that are overlapping [2] in the lime-frequency(TF)plane in the ease of multicomponent,micro-motion,which can lead to the poor precision of parameter estimation. | Chen SONG Yirong WU Liangjiang ZHOU Ruoming LI Jiefang YANG Wei LIANG Chibiao DING | 2019 | Science China(Information Sciences)2019，62，2： | 2 |
| 4 | An im proved nlcs algorithm with capability analysis for one- stationary BiSAR显示文摘 | QIU Xiaolan HU Donghui DING Chibiao | 2008 | IEEE Trans Geosci Remote Sens2008，46，10： | 1 |
| 5 | A HIGH RESOLUTION WIDE SWATH SAR METHOD BASED ON INTRA-PULSE NULL STEERING AND MIMO显示文摘High Resolution Wide Swath (HRWS) Synthetic Aperture Radar (SAR) often suffers from low Signal-to-Noise Ratio (SNR) due to small transmitting antenna, especially in phased array antenna systems. Digital Beam Forming (DBF) based on Single Input and Multiple Output (SIMO) achieves receiving array gain at the cost of increasing data rate. This letter proposes a new HRWS SAR method, which employs intra-pulse null steering to get receiving gain in elevation and decrease the data rate, and Multiple Input and Multiple Output (MIMO) using Space-Time Block Coding (STBC) in azimuth to get transmitting gain and receiving array gain simultaneously. The feasibility is verified by deduction and simulations. | Chen Longyong Liang Xingdong Ding Chibiao | 2008 | Journal of Electronics(China)2008，25，6： | 1 |
| 6 | An Improved NLCS Algorithm with Capability Analysis for One-stationary BiSAR 显示文摘 | Qiu Xiaolan Hu Donghui Ding Chibiao | 2008 | IEEE Trans on Geoseience and Remote Sensing2008，46，10： | 1 |
| 7 | An improved NLCS algorithm with capability analysis for one-stationary BiSAR显示文摘 | Qiu Xiaolan Hu Donghui and Ding Chibiao | 2008 | IEEE Transaction on Geoscience and Remote Sensing2008，46，10： | 1 |
| 8 | An Improved NLCS Mgorithm With Capability Analysis for One-Stationary BiSAR显示文摘 | Xiaolan Qiu Donghui Hu Chibiao Ding | 2008 | IEEE Transactions on Geoscience and Remote Sensing2008，46，10： | 1 |
| 9 | An Omega-K algorithm with phase error compensation for bistatic SAR of a translational invariant case 显示文摘 | Xiaolan Qiu Donghui Hu Chibiao Ding | 2008 | IEEE Transactions on Geoscience and Remote Sensing2008，46，8： | 1 |
| 10 | MULTISENSOR TRACKING SYSTEM WITH ATTITUDE MEASUREMENTS显示文摘MULTISENSORTRACKINGSYSTEMWITHATTITUDEMEASUREMENTSDingChibiao,MaoShiyi(DepartmentofElectronicEngineering,BeijingUniversityofAe... | Ding Chibiao, Mao Shiyi (Department of Electronic Engineering, Beijing University of Aeronautics and Astronautics, Beijing, 100083, China) | 1997 | Chinese Journal of Aeronautics1997，10，4： | 1 |
| 11 | Geometric constraints based 3D reconstruction method of tomographic SAR for buildings显示文摘The mainstream methods of tomographic synthetic aperture radar(tomoSAR)3D reconstruction are usually realized by processing the registered 2D SAR images pixel by pixel without considering the geometric structure of the observed targets.As a class of targets with regular facades,tomo SAR 3D reconstruction of buildings is of important application value nowadays.In this study,to optimize the tomo SAR3D reconstruction results of buildings,we first introduce and analyze the tomo SAR 3D reconstruction theory based on a back projection imaging algorithm and then present a tomo SAR 3D reconstruction method based on geometric constraints.We can accurately extract the building’s facade as the geometric constraints by processing and fusing the point density map and the height map extracted from the spatial distribution of the tomo SAR 3D point cloud.Taking the extracted geometric structure of the building’s facade and signal to noise ratio(SNR)of registered 2D SAR images as prior information,we then impose geometric constraints on tomo SAR sparse 3D reconstruction with an adaptive iterative shrinkage-thresholding algorithm and achieve an optimized tomo SAR 3D reconstruction result.Finally,measured data of a P-band airborne tomo SAR system is used.3D reconstruction results show that the proposed method outperforms the traditional methods without geometric constraints regarding 3D reconstruction performance,which proves the validity and practicality of our proposed method. | Dong HAN Zekun JIAO Liangjiang ZHOU Chibiao DING Yirong WU | 2023 | Science China(Information Sciences)2023，66，1： | 1 |
| 12 | WATERMARKING WITH REFINED PERCEPTUAL MASKING TUNED FOR SYNTHETIC APERTURE RADAR IMAGES显示文摘A watermarking scheme designed for remote sensing images needs to meet the same demand of both invisibility as for ordinary digital images. Due to specific perceptual characteristics of Synthetic Aperture Radar(SAR) images, the watermarking algorithms with consideration of Human Vision System(HVS) modeling from optical images give poor performance when applied on SAR images. This paper examines a variety of factors affecting the noise sensitivity, and further proposes a refined pixel-wise masking approach for watermarking on SAR images. The proposed approach is applied on logarithmic transformed SAR images, and has increased the acceptable watermark embedding strength by about 6 dB to 10 dB while achieving the same levels of watermarked image visual quality. Experimental results show that this approach enhanced the perceptual invisibility of watermarking based on wavelet decomposition. | Lei Bin Ding Chibiao | 2014 | Journal of Electronics(China)2014，31，4： | 0 |
| 13 | RESEARCH ON INPUT IMPEDANCE OF DIPOLE ANTENNA IN GTEM CELL显示文摘The formula of input impedance of dipole antenna in Gigahertz Transverse ElectroM agnetic(GTEM) cell based on the dyadic Green's function is first obtained in this paper. The validation of the formula is verified by the results of theoretical derivation and simulation with well agreements. In comparison with the formula of input impedance in free space, the relationship between the change of input impedance with the length of antenna and the position of antenna in GTEM cell is obtained. In addition, some meaningful conclusions are presented, which not only can be referred by the further research of ElectroM agnetic Interference(EMI) measurements in GTEM cell, but also provide the theoretical basis for testing compensation and error analysis. | Xing Shuguang Lv Xiaode Ding Chibiao | 2014 | Journal of Electronics(China)2014，31，6： | 0 |
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