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2005年03月21日

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2005年03月21日

【期刊论文】Propagation Velocity Uncertainty on GPR SAR Processing*

吴仁彪, Renbiao Wu†, Kunlong Gu†, Jian Li†, Marshall Bradley‡, James Habersat§, George Maksymonko§

IEEE Transactions on Aerospace and Electronic Systems, Vol. 39, No.3, July 2003.,-0001,():

摘要

暂无

关键词: ultra wideband radar,, ground penetrating radar,, synthetic aperture radar,, velocity uncertainty,, mine detection.,

  • 76浏览

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2005年03月21日

【期刊论文】Complex ISAR Imaging of Maneuvering Targetsvia the Capon Estimator

吴仁彪, Zheng-She Liu, Member, IEEE, Renbiao Wu, and Jian Li, Senior Member

IEEE TRANSACTIONS ON SIGNAL PROCESSING, VOL. 47, NO.5, MAY 1999,-0001,():

摘要

暂无

关键词: ISAR imaging,, recursive FIR filtering based method,, recursive spectral estimation.,

  • 96浏览

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  • 234下载

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2005年03月21日

【期刊论文】Arrav pattern SVntnesis and robust beamforming for a complex sonar system

吴仁彪, R.Wu, Y.Ma, R.D. James

IEEE Proc-Rodar, Sonar Naving, Vol. 144, No.6, December 1997,-0001,():

摘要

暂无

关键词: Beamforming,, Sonar arrays,, Pattern synthesis method

  • 51浏览

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  • 95下载

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2005年03月21日

【期刊论文】Array Pattern Distortion and Remedies in Space-Time Adaptive Processing for Airborne Radar

吴仁彪, Renbiao Wu, Member, IEEE, and Zheng Bao, Senior Member

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, VOL. 46, NO.7, JULY 1998,-0001,():

摘要

暂无

关键词: Adaptive arrays,, airborne radar

  • 22浏览

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  • 105下载

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2005年03月21日

【期刊论文】An Acoustic Proximity Ranging System for Monitoring the Cavity Thickness

吴仁彪, Xi Li†, Renbiao Wu†, Srihari Rasmi‡, Jian Li†, Louis N. Cattafesta III‡, Mark Sheplak‡

IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control, Vol. 50, No. 7, July 2003,-0001,():

摘要

暂无

关键词: Cavity thickness,, proximity ranging,, time delay estimation,, acoustic transducer

  • 43浏览

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2014年03月27日

【期刊论文】Eigensubspace-Based Filtering with Application in Narrow-Band Interference Suppression for SAR

吴仁彪, Feng Zhou, Renbiao Wu, Mengdao Xing, Zheng Bao.

IEEE Geoscience and Remote Sensing Letters, 2007, Vol.4, No.1, pp.75-79.,-0001,():

摘要

Synthetic aperture radar has found wide applications in many areas, e.g., battlefield awareness.However, SAR is vulnerable to various kinds of interference, among which narrow-band interference is commonly used.In this letter, an eigensubspace-based filtering approach is proposed for NBI suppression in SAR without using passive-sniff data as the reference signal.

关键词: Interference suppression,, motion-parameter estimation,, radar imaging,, synthetic aperture radar (, SAR), .,

  • 28浏览

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2014年03月27日

【期刊论文】Motion compensation for UAV SAR based on raw radar data

吴仁彪, Mengdao Xing, Xiuwei Jiang, Renbiao Wu, Feng Zhou, Zheng Bao.

IEEE Transactions on Geoscience and Sensing, 2009, Vol.47, No.8, pp.2870-2883.,-0001,():

摘要

Unmanned aerial vehicle (UAV) synthetic aperture radar (SAR) is very important for battlefield awareness. For SAR systems mounted on a UAV, the motion errors can be considerably high due to atmospheric turbulence and aircraft properties, such as its small size, which makes motion compensation (MOCO) in UAV SAR more urgent than other SAR systems. In this paper, based on 3-D motion error analysis, a novel 3-D MOCO method is proposed. The main idea is to extract necessary motion parameters, i.e., forward velocity and displacement in line-of-sight direction, fromradar raw data, based on an instantaneous Doppler rate estimate. Experimental results show that the proposed method is suitable for low- or medium-altitude UAV SAR systems equipped with a low-accuracy inertial navigation system.

关键词: Motion compensation (, MOCO), ,, radar imaging,, synthetic aperture radar (, SAR), ,, unmanned aerial vehicle (, UAV), .,

  • 34浏览

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2014年03月27日

【期刊论文】Design and analysis of broadband beamspace adaptive arrays

吴仁彪, Wei Liu, Renbiao Wu, and Richard J L.

IEEE Transactions on Antennasand Propagation, 2007, Vol.55, No.12, pp.3413-3420.,-0001,():

摘要

A beamspace adaptive planar array for broadband beamforming is proposed based on the frequency invariant beamforming technique. A detailed analysis is provided for both the linear arrays and the planar arrays, where two conditions are imposed: the beams should exhibit a good frequency invariant property and be linearly independent. These two conditions are not independent and there is a tradeoff between them. To improve the interference cancellation capability of the array, we may need to sacrifice the frequency invariant property to some degree for more linearly independent beams. A sufficient condition for the linear independence of the beams is derived with a DFT matrix based design proposed. Simulation results verified our analysis and the proposed method.

关键词: Adaptive arrays,, antenna arrays,, beam steering,, broadband communication.,

  • 21浏览

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2014年03月27日

【期刊论文】Time-delay- and time-reversal-based robust Capon beamformers for ultrasound imaging

吴仁彪, Zhisong Wang, Jian Li, and Renbiao Wu.

IEEE Transactions on Medical Imaging, 2005, Vol.24, No.10, pp. 1308-1322.,-0001,():

摘要

Currently, the nonadaptive delay-and-sum (DAS) beamformer is extensively used for ultrasound imaging, despite the fact that it has lower resolution and worse interference suppression capability than the adaptive standard Capon beamformer (SCB) if the steering vector corresponding to the signal of interest (SOI) is accurately known. The main problem which restricts the use of SCB, however, is that SCB lacks robustness against steering vector errors that are inevitable in practice. Whenever this happens, the performance of SCB may become worse than that of DAS. Therefore, a robust adaptive beamformer is desirable to maintain the robustness of DAS and adaptivity of SCB. In this paper we consider a recent promising robust Capon beamformer (RCB) for ultrasound imaging. We propose two ways of implementing RCB, one based on time delay and the other based on time reversal. RCB extends SCB by allowing the array steering vector to be within an uncertainty set. Hence, it restores the appeal of SCB including its high resolution and superb interference suppression capabilities, and also retains the attractiveness of DAS including its robustness against steering vector errors. The time-delay-based RCB can tolerate the misalignment of data samples and the time-reversal-based RCB can withstand the uncertainty of the Green’s function. Both time-delay-based RCB and time-reversal-based RCB can be efficiently computed at a comparable cost to SCB. The excellent performances of the proposed robust adaptive beamforming approaches are demonstrated via a number of simulated and experimental examples.

关键词: Adaptive arrays,, array errors,, interference suppression,, robust adaptive beamforming,, robust Capon beamforming,, time delay,, time reversal,, ultrasound imaging.,

  • 21浏览

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2017年02月10日

【期刊论文】Multipath interference mitigation in GNSS via WRELAX

吴仁彪, Qiongqiong Jia , Renbiao Wu , Wenyi Wang , Dan Lu , Lu Wang , Jie Li

GPS Solutions,2016, pp.1-12.,-0001,():

摘要

In order to suppress the multipath interference in global navigation satellite system, two algorithms based on NLS (nonlinear least square) parameter estimation are proposed. Instead of the classic delay lock loop, the first proposed algorithm estimates the parameters of the line of sight signal and the multipath interference in the correlation domain. The NLS cost function is solved by WRELAX (weighted Fourier transform and RELAXation), which decouples the multidimensional optimization problem into a sequence of one-dimensional optimization problems in a conceptually and computationally simple way. In order to further reduce the complexity, the second NLS algorithm utilizing the characteristic of the C/A code is proposed, which estimate the parameters in the data domain. Finally, the two proposed algorithms are compared with the existing multipath interference methods and show excellent performance and less computational burden.

关键词: GNSS,, Multipath interference,, Classic DLL,, Narrow correlator,, MEDLL,, WRELAX

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2017年02月14日

【其他】Impact Assessment of Wind Farms on Radio Devices in Civil Aviation

吴仁彪, Xiaoliang Wang, Renbiao Wu, Weikun He, Yuzhao Ma

invited chapter in《Wind Farms Performance, Economic Factors and Effects on the Environment》, Nova Science Publisher, 2016.,-0001,():

摘要

Wind power is an attractive clean energy and wind farms increase with very high speed in recent years. However, as a particular obstacle, wind farms may degrade the performance of radio devices in civil aviation obviously. Therefore, wind farms may threaten the flight safety and correct impact assessment of wind farms on radio devices is important to guarantee the safety of civil aviation. In this chapter the potential impact of wind farms on radio devices in civil aviation and a review of the impact assessment procedure and methods of our research group is presented. The radio devices discussed in the chapter include surveillance devices such as primary surveillance radar (PSR) and second surveillance radar (SSR) and radio navigation devices such as very high frequency omnidirectional range (VOR) and instrument landing system (ILS). A wind farm usually comprises several wind turbines with very large size. The proper estimation of the scattering coefficient or radar cross section (RCS) of the wind turbine is of great importance to assess the impact of wind farms correctly. However, the intensity of electromagnetic scattering and the RCS of a wind turbine vary with several factors. Consequently a review of RCS estimation methods for a wind turbine of our research group is also presented in this chapter.

关键词: civil aviation,, wind farm,, wind turbine,, impact assessment,, RCS estimation,, radio device,, radar,, radio navigation

  • 655浏览

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  • 10下载

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2017年02月10日

【期刊论文】Probability hypothesis density filter for radar systematic error estimation aided by ADS-B

吴仁彪, Tao Zhang , Renbiao Wu , Ran Lai , Zhe Zhang

Signal Processing, Vol.120, 2016, pp.280-287.,-0001,():

摘要

This paper provides a solution for systematic bias estimation of radar without priori information of data association based on the probability hypothesis density (PHD) filter aided by automatic dependent surveillance broadcasting (ADS-B). Novel dynamics model and measurement model of systematic bias are developed by using ADS-B surveillance data as the high-accuracy reference source. The Gaussian mixture probability hypothesis density (GM-PHD) filter is applied for recursive estimation of systematic bias by introducing the novel dynamics model and measurement model of systematic bias into the filter. Numerical results are provided to verify the effectiveness and improved performance of the proposed method for systematic bias estimation.

关键词: Multi-sensor fusion,, Systematic bias estimation,, Probability hypothesis density,, Automatic dependent surveillance,, broadcasting

  • 42浏览

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2014年03月27日

【期刊论文】Space-time adaptive monopulse processing for airborne radar in non-homogeneous environments

吴仁彪, Renbiao Wu, Zhigang Su, Lu Wang.

International Journal of Electronics and Communications, 2011, Vol.65, No.3, pp.258-264.,-0001,():

摘要

Space-Time Adaptive Processing (STAP) can be used in combination with monopulse techniques for the estimation of spatial and temporal parameters of moving targets in airborne radar. However, in non-homogeneous environment, the available amount of secondary data which have the same statistical characteristics with the clutter in the primary data is very limited. In this case, the optimum STAP is impractical. In this paper, by combining linearly constrained monopulse technique with STAP, a Reduced Dimension Spatial and Temporal Parameter Estimation (referred to as RD-STPE) method is proposed. Simulation results show that, in non-homogeneous environments, the proposed method can improve the estimation accuracy of the target parameters dramatically, and is more robust than the full dimension adaptive monopulse method with STAP.

关键词: airborne radar,, parameter estimation,, monopulse technique,, space-time adaptive processing (, STAP), ,, nonhomogeneous clutter

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  • 35下载

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2017年02月10日

【期刊论文】Compressive sensing-based wind speed estimation for low-altitude wind-shear with airborne phased array radar

吴仁彪, Hai Li , Meng Zhou , Qinghua Guo , Renbiao Wu , Jiangtao Xi

Multidimensional Systems and Signal Processing, 2016, pp.1-14.,-0001,():

摘要

An important issue in low-altitude wind-shear detection is to estimate the wind speed of wind field. In this paper, a novel method for wind speed estimation with airborne phased array radar is proposed by combining space time adaptive processing and compressive sensing. The proposed method is able to achieve accurate wind speed estimate in the condition of limited number of sampling pulses, as demonstrated by numerical examples.

关键词: Wind-shear,, Compressive sensing,, Airborne phased array radar,, Space time,, adaptive processing,, Wind speed estimation

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2005年03月21日

【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,():

摘要

暂无

关键词: Inverse synthetic aperture radar (, ISAR), imaging,, range-Doppler (, RD), imaging,, range-instantaneous Doppler (, RID), imaging.,

  • 38浏览

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  • 222下载

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2014年03月27日

【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,():

摘要

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.

关键词: Covert communication,, information hiding,, JPEG2000,, steganography.,

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  • 4下载

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2014年03月27日

【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,():

摘要

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.

关键词: GPS,, interference cancellation,, adaptive arrays,, space-time adaptive processing,, high dynamic GPS receiver

  • 12浏览

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2005年03月21日

【期刊论文】Acoustic Proximity Ranging in the Presence of Secondary Echoes*

吴仁彪, Xi Li†, Renbiao Wu†, Srihari Rasmi‡, Jian Li†, Louis N. Cattafesta III‡, Mark Sheplak‡

IEEE Transactions on Instrumentation and Measurement, Vol. 52, No. 5, October 2003,-0001,():

摘要

暂无

关键词: Proximity ranging,, time delay estimation,, secondary echoes,, acoustic transducer

  • 73浏览

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  • 51下载

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