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【期刊论文】Interference suppression with flat gain constraint for satellite navigation systems
吴仁彪, Wenyi Wang , Qingrong Du , Renbiao Wu , Junli Liang
IET Radar, Sonar & Navigation, Vol.9,No.7, 2015, pp.852-856.,-0001,():
-1年11月30日
Power minimisation approach is an effective interference suppression algorithm for satellite navigation systems. It forms automatically deep nulls in the direction-of-arrival (DOA) of interferences without prior information about the DOAs of satellite signals and interferences. However, it cannot provide flat gains for other directions. Thus, the desired satellite signals may be partly suppressed when they locate in the shallow nulls. By combining eigenvalue thresholding method and l1-norm constraint, a new interference suppression algorithm is proposed for satellite navigation systems that would provide approximately flat gains in all directions except that of interferences. However, the l1-norm constraint leads to a non-smooth optimisation problem which cannot be solved by the conventional gradient-based algorithm. After that, by utilising the proximal operator, an iterative algorithm is proposed. The simulations demonstrate the effectiveness of the proposed algorithm.
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【期刊论文】Migration Through Resolution Cell Compensation in ISAR Imaging
吴仁彪, Mengdao Xing, Student Member, IEEE, Renbiao Wu, Senior Member, Jinqiao Lan, and Zheng Bao
IEEE GEOSCIENCE AND REMOTE SENSING LETTERS, VOL. 1, NO.2, APRIL 2004,-0001,():
-1年11月30日
Range-Doppler (RD) processing is widely used in conventional inverse synthetic aperture radar (ISAR) imaging. The unwanted translational motion of moving targets is compensated by envelope alignment and autofocus. For existing ISAR imaging algorithms, the scatterers\' migration through resolution cells (MTRC) caused by the rotational motion is usually ignored. With the improvement of resolution or the increase of target size, MTRC cannot be neglected. In this letter, the keystone formatting algorithm developed in SAR is used for the MTRC compensation in ISAR. Before the keystone formatting, coherent processing must be performed on the raw phase history data. An effective approach is proposed for this kind of coherent processing. Numerical examples are provided to demonstrate the performance of the proposed approach.
Inverse synthetic aperture radar (, ISAR), imaging,, range-Doppler (, RD), imaging,, range-instantaneous Doppler (, RID), imaging.,
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【期刊论文】A High Capacity Steganography Scheme for JPEG2000 Baseline System
吴仁彪, Liang Zhang, Haili Wang, Renbiao Wu.
IEEE Transactions on Image Processing, 2009, Vol.18, No.8, pp.1797-1803.,-0001,():
-1年11月30日
Hiding capacity is very important for efficient covert communications. For JPEG2000 compressed images, it is necessary to enlarge the hiding capacity because the available redundancy is very limited. In addition, the bitstream truncation makes it difficult to hide information. In this paper, a high-capacity steganography scheme is proposed for the JPEG2000 baseline system, which uses bit-plane encoding procedure twice to solve the problem due to bitstream truncation. Moreover, embedding points and their intensity are determined in a well defined quantitative manner via redundancy evaluation to increase hiding capacity. The redundancy is measured by bit, which is different from conventional methods which adjust the embedding intensity by multiplying a visual masking factor. High volumetric data is embedded into bit-planes as low as possible to keep message integrality, but at the cost of an extra bit-plane encoding procedure and slightly changed compression ratio. The proposed method can be easily integrated into the JPEG2000 image coder, and the produced stego-bitstream can be decoded normally. Simulation shows that the proposed method is feasible, effective, and secure.
Covert communication,, information hiding,, JPEG2000,, steganography.,
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【期刊论文】Finger-Vein Recognition Based on Gabor Features
吴仁彪, Jingfeng Yang, Renbiao Wu.
invited chapter in 《Biometric Systems, Design and Applications》, INTECH Publisher,2011.,-0001,():
-1年11月30日
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【期刊论文】Power Minimization with Derivative Constraints for High Dynamic GPS Interference Suppression
吴仁彪, Wu Renbiao, Lu Dan, Li Chan.
Science China Information Sciences, 2012, Vol. 55, No. 4, pp. 857-866.,-0001,():
-1年11月30日
In this paper, a novel adaptive interference suppression algorithm is proposed for high dynamic GPS (global positioning system) receiver. The new method incorporates derivative constraints on the interference DOA (direction of arrival) into power minimization approach, which could broaden the width of nulls in the interferences directions and adapt to the rapid change of the interference directions. Compared with the traditional wide nulling algorithm based on the derivative constraints, the new method does not have to know or estimate the DOAs of the desired signal and the interference. The new method is firstly discussed in the context of spatial processing, and then extended to space-time adaptive processing to mitigate wideband diffusive multipath interference. Effectiveness of the new method is verified via simulation examples.
GPS,, interference cancellation,, adaptive arrays,, space-time adaptive processing,, high dynamic GPS receiver
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