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Wang Baoping

Bio: Wang Baoping is an academic researcher from Northwestern Polytechnical University. The author has contributed to research in topics: Inverse synthetic aperture radar & Radar imaging. The author has an hindex of 3, co-authored 5 publications receiving 13 citations.

Papers
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Journal Article
TL;DR: A new piecewise Logistic chaotic spread spectrum communication algorithm was proposed based on the analysis of the randomness, correlation, initial sensitivity and Lyapunoy exponents of the referred chaotic sequence, and applied to spread Spectrum communication results show that the algorithm greatly improves the error rate and confidentiality.
Abstract: Chaotic sequence as spreading code in spread spectrum systems has the characteristics of rich sequences and good confidentiality.Traditional Logistic chaotic sequence as well as its modified sequence is not ideal in ergodicity and randomness of its sequence.To solve this problem,a new piecewise Logistic chaotic spread spectrum communication algorithm was proposed based on the analysis of the randomness,correlation,initial sensitivity and Lyapunoy exponents of the referred chaotic sequence,and applied to spread spectrum communication.The simulation results show that the algorithm greatly improves the error rate and confidentiality in the spread spectrum communication compared to the traditional logistic chaotic sequence and its modified sequence,which proves that the algorithm mentioned in this article is effective.

5 citations

Proceedings ArticleDOI
16 Apr 2011
TL;DR: The localization character of keystone transform at MTRC (Migration through range cells) is found, and a novel method for solving M TRC is proposed, and experimental results show that the novel algorithm is effective.
Abstract: The keystone transform and its applications in inverse synthetic aperture radar (ISAR) are analyzed in the paper. The localization character of keystone transform at MTRC (Migration through range cells) is found, a novel method for solving MTRC is proposed. The novel method is tested using of practice measure data and simulating data, the experimental results show that the novel algorithm is effective.

5 citations

Proceedings ArticleDOI
03 Apr 2012
TL;DR: In this article, the Matrix Pencil Back Projection (MPBP) algorithm is implemented with FIR pre-filtering instead of using approximate prolate spheroidal wave functions given in the original method.
Abstract: This article mulls over the implementation of Matrix Pencil back Projection (MPBP) algorithm on Inverse Synthetic Aperture Radar (ISAR) data of uniformly rotating targets. The method is recently proposed by Sahin o zsoy et al. for Synthetic Aperture Radar (SAR). In this paper, the method is implemented with FIR pre-filtering instead of using approximate prolate spheroidal wave functions given in the original method. Moreover, the article emphasizes on the comparison between the standard Convolution Back projection Method (CBP) and MPBP methods in terms of; 1) reconstructed image quality when a small set of data is used; 2) noise performance for additive zero-mean white Gaussian noise. MPBP and CBP are applied both on the simulated and the experimental ISAR data. The ku-band experimental ISAR data is acquired for the targets (spheres and corner reflectors) arranged in different geometries in a Far-Field Compact Range Anechoic chamber at AERO, Pakistan.

3 citations

Journal ArticleDOI
TL;DR: The simulation results show that the proposed image enhancement algorithm can effectively suppress the noise of an image, enhance its contrast and visual effect, sharpen its edge and adjust its dynamic range.

2 citations

Journal Article
TL;DR: In this paper, a middle-field CT arithmetic is put up and can realize the microwave imaging of target, which can excellently get 2-D imaging with small aperture angle.
Abstract: The middle-field ISAR imaging by mending curved phase front is as same as the far-field imaging,but can reduce the requirement of measurement distance greatly,with great engineering meanings.In this paper,middle-field CT arithmetic is put up and can realize the microwave imaging of target.middle-field CT arithmetic can excellently get 2-D imaging with small aperture angle.The Simulink and experiment result proved the arithmetic's efficiency.

1 citations


Cited by
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Journal ArticleDOI
TL;DR: The sparse Bayes learning method, which has a lot of advantages compared with other similar methods, is adopted to realize the super-resolution imaging for the purpose of separating the superposed scatterers and its superiority in reducing the computation load of the 3-D InISAR imaging system is demonstrated explicitly.
Abstract: In this paper, a novel three-dimensional (3-D) Interferometric inverse synthetic aperture radar (InISAR) imaging method, which especially works on the ship target, is presented. Considering the characteristics of the ship target and the 3-D InISAR system, the bistatic configuration is designed to avoid the imaging failure in special situations caused by the low velocity of the ship target. The specificity of the 3-D InISAR imaging technique makes the adoption of the optimal imaging time selection method based on the estimation of the Doppler center, which can help to select the imaging time when the cross-range resolution reaches maximum, effective and simple enough for the 3-D reconstruction of the ship target. Besides, the translational and angular motion compensations in such situations are explained clearly. Due to the shortness of the selected echoes caused by motion complexity of the ship target, the sparse Bayes learning method, which has a lot of advantages compared with other similar methods, is adopted to realize the super-resolution imaging for the purpose of separating the superposed scatterers and its superiority in reducing the computation load of the 3-D InISAR imaging system is demonstrated explicitly. Finally, the distortion of the reconstructed coordinate for the ship target caused by the bistatic configuration is corrected by the simplified coordinate transformation and the relationship between the coordinates of the ship target and the reconstructed 3-D model is explained in detail. Some experimental results are provided to substantiate the effectiveness of the 3-D InISAR imaging method for the ship target in this paper.

34 citations

Journal ArticleDOI
TL;DR: To produce high-resolution ISAR/InISAR image of the maneuvering target, a novel algorithm via the peak extraction technique is proposed and the correctness of the theoretical derivation and the performance of the new algorithms are illustrated through several simulation experiments.
Abstract: Inverse synthetic aperture radar (ISAR) imaging has the competence of generating two-dimensional (2-D) high-quality images of remote moving targets, while interferometric ISAR (InISAR) is a technique to reproduce three-dimensional (3-D) high-resolution shapes of targets by employing several ISAR images obtained from different antennas. For the target moving with an invariable acceleration, the Doppler frequency shift of its echoes is proved to be time variant; consequently, the Range-Doppler (RD) algorithm will not work properly for acquiring the clear ISAR image of it. To produce high-resolution ISAR/InISAR image of the maneuvering target, a novel algorithm via the peak extraction technique is proposed. The main contributions made by this paper can be listed as follows: 1) by analyzing ISAR imaging with the RD technique for the target moving with a constant acceleration, it is elaborately demonstrated that each scattering point still corresponds to a unique peak in the defocused ISAR image; 2) the expression of the peak location in the defocused ISAR image corresponding to each scattering point is precisely derived; 3) a novel peak extraction technique is developed for forming a high-resolution radar image of the maneuvering target; 4) due to the discovery that the ISAR images obtained in this way can completely preserve the phase information, a new InISAR imaging method via the peak extraction technique is presented consequently. The correctness of the theoretical derivation and the performance of the new algorithms are illustrated through several simulation experiments.

23 citations

Journal ArticleDOI
TL;DR: A novel algorithm for 3-D interferometric inverse synthetic aperture radar (InISAR) imaging of ship target with complex motion via orthogonal double baseline is presented and the effectiveness of the proposed method is proved by some simulation results.
Abstract: A novel algorithm for 3-D interferometric inverse synthetic aperture radar (InISAR) imaging of ship target with complex motion via orthogonal double baseline is presented. For the ship target with a certain translational velocity and 3-D rotation, the distance between any scatterers on the target and the radar is analyzed in detail, and the keystone transform is used to reduce the impact of migration through resolution cell of ship target with big size. Then, the fractional Fourier transform is adopted to achieve the 2-D ISAR image of the target, and the mismatch of the ISAR images achieved by the three radars is solved by the image coregistration method according to the 1-D range profile. Finally, the 3-D InISAR image of the ship target is achieved with the interferometric operation with the three ISAR images. The effectiveness of the proposed method is proved by some simulation results, and the influence of different motion parameters on the 3-D imaging of ship target is analyzed simultaneously in this paper.

22 citations

Journal ArticleDOI
TL;DR: A spotlight mode SAR-imaging algorithm that improves far-field and near-field tomographic reconstruction resolution (and RCS extraction accuracy) is presented and shows that the unfavorable effects of the point spread function are reduced with the developed algorithm.
Abstract: In order to alleviate the far-field requirement from RCS measurements, a two-step procedure of first obtaining the SAR image of the object followed by an RCS extraction has been recently introduced. In this manuscript, a spotlight mode SAR-imaging algorithm that improves far-field and near-field tomographic reconstruction resolution (and RCS extraction accuracy) is presented. This algorithm comprises the following steps: 1) the range profiles are obtained with super resolution by utilizing the band-pass matrix pencil method. 2) Back-projection, which does not require polar-to-Cartesian interpolation in the spectral domain, is used for the far-field or near-field image reconstruction. 3) Background of the reconstructed image is removed with the Otsu’s thresholding. 4) Complex amplitudes and locations of the scattering centers are selected from the thresholded image with an amplitude extraction procedure. Finally, obtained scattering centers are used for RCS extraction. The simulation and measurement results show that the unfavorable effects of the point spread function are reduced with the developed algorithm, and hence, the quality of the SAR image is increased, and the accuracy of the extracted RCS is improved.

22 citations

Journal ArticleDOI
TL;DR: A dynamic multimapping composite (DMMC) chaotic sequence algorithm is proposed to overcome the drawback with respect to the availability of only a limited number of sequences and fixed mechanism in the direct sequence spread spectrum communication.
Abstract: In this study, a dynamic multimapping composite (DMMC) chaotic sequence algorithm is proposed to overcome the drawback with respect to the availability of only a limited number of sequences and fixed mechanism in the direct sequence spread spectrum communication, based on the improved Logistic, Chebyshev and Kent mappings. The control parameters are used to determine the odd mapping and even mapping, and the fractal function is established. Then, the selection function and optimal function are established by alternatively driving the odd mapping and even mapping, and the optimal sequence is generated. The test results with respect to sensitivity, balance, run and correlation indicate that the sequence generated by the DMMC algorithm demonstrates obvious advantages and flexibility.

6 citations