检索结果-南通市图书馆

Single Sample Polarization Filtering

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 1992年第1期3卷 45-55页

作者： xiaolin, qiao Yongtan, Liu Harbin Inst. of Tech. Harbin China

A new method on radar signal polarization filtering using only single sample of signal is proposed. The algorithm is very simple and it is suitable for the filtering processing of a stationary or unstationary polariza... 详细信息

关键词： Radar measurement Signal Processing

Radio Disturbance Suppression for Ground Wave Radar

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 1994年第2期5卷 1-11页

作者： qiao, xiaolin Liu, Yongtan Harbin Inst of Technology Harbin China

A new method of single sample polarization filtering is proposed. The algorithm is fast and suitable for the polarization processing of stationary or nonstationary polarized disturbed signals with one or more independent disturbances. A ground wave polarimetric radar with the ability of radio disturbance suppression is then introduced. Some numerical results demonstrate the effectiveness of single sample polarization filtering method for ground wave polarimetric radar.

关键词： Algorithms Attenuation Electromagnetic wave polarization Interference suppression Polarimeters Radar countermeasures Radar interference Radar transmitters Signal filtering and prediction Telecommunication equipment

Knowledge-based adaptive polarimetric detection in heterogeneous clutter

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2014年第3期25卷 434-442页

作者： Yinan Zhao Fengcong Li xiaolin qiao School of Information and Electrical Engineering Harbin Institute of Technology (Weihai)

The detection performance and the constant false alarm rate behavior of the conventional adaptive detectors are severely degraded in heterogeneous clutter. This paper designs and analyses a knowledge-based （KB） adaptive polarimetric detector in het-erogeneous clutter. The proposed detection scheme is composed of a data selector using polarization knowledge and an adaptive polarization detector using training data. A polarization data selector based on the maximum likelihood estimation is proposed to remove outliers from the heterogeneous training data. This selector can remove outliers effectively, thus the training data is purified for estimating the clutter covariance matrix. Consequently, the performance of the adaptive detector is improved. We assess the performance of the KB adaptive polarimetric detector and the adaptive polarimetric detector without a data selector using simulated data and IPIX radar data. The results show that the KB adaptive polarization detector outperforms its non-KB counterparts.

关键词： adaptive detection polarization compound-Gaussian clutter prior knowledge.

Source localization based on symmetrical MUSIC and its statistical performance analysis

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2013年第6期56卷 74-86页

作者： YAN FengGang JIN Ming qiao xiaolin School of Electronics and information Engineering Harbin Institute of Technology Laboratory of Information Engineering Harbin Institute of Technology(Weihai)

In this paper,a new method for fast direction-of-arrival(DOA) estimation with no dependance on array configurations is proposed,which is referred to as the symmetrical multiple signal classification(SMUSIC).Unlike the standard MUSIC,the S-MUSIC spatial spectrum is constructed by the intersection of the noise subspace and the conjugate noise subspace,and it hence generates spectral peaks at the true DOAs and the symmetrical virtual DOAs *** a characteristic allows fast DOA estimation by spectral search over only half of the total angular ***,the new approach has a much lower computational complexity than the standard *** statistical performance of S-MUSIC is studied and a close-form expression for the MSEs(mean square errors) of DOA estimation by the proposed estimator is *** simulations are conducted to demonstrate the effectiveness of the new algorithm and to verify the theoretical analysis,and it is indicated that S-MUSIC makes a trade-off between MSEs and lower computational complexity as well as an improved resolution for closely-spaced sources as compared to the standard MUSIC.

关键词： symmetrical multiple signal classification(S-MUSIC) direction-of-arrival(DOA) estimation alternative projection method(APM) singular value decomposition(SVD) statistical performance analysis

Computationally efficient direction finding using polynomial rooting with reduced-order and real-valued computations

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2016年第4期27卷 739-745页

作者： Fenggang Yan Yi Shen Ming Jin xiaolin qiao School of Information and Electrical Engineering Harbin Institute of Technology School of Astronautics Harbin Institute of Technology at Weihai

The root multiple signal classification（root-MUSIC） algorithm is one of the most important techniques for direction of arrival（DOA） estimation. Using a uniform linear array（ULA） composed of M sensors, this method usually estimates L signal DOAs by finding roots that lie closest to the unit circle of a（2M-1）-order polynomial, where L 〈 M. A novel efficient root-MUSIC-based method for direction estimation is presented, in which the order of polynomial is efficiently reduced to 2L. Compared with the unitary root-MUSIC（U-root-MUSIC） approach which involves real-valued computations only in the subspace decomposition stage, both tasks of subspace decomposition and polynomial rooting are implemented with real-valued computations in the new technique,which hence shows a significant efficiency advantage over most state-of-the-art techniques. Numerical simulations are conducted to verify the correctness and efficiency of the new estimator.

关键词： direction-of-arrival(DOA) estimation root multiple signal classification(root-MUSIC) real-valued computations reduced-order

Scheme of adaptive polarization filtering based on Kalman model

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2006年第1期17卷 13-18页

作者： Song Lizhong Qi Haiming qiao xiaolin Meng Xiande Inst. of Electronic Engineering Harbin Inst. of Technology Harbin 150001 P. R. China

A new kind of adaptive polarization filtering algorithm in order to suppress the angle cheating interference for the active guidance radar is presented. The polarization characteristic of the interference is dynamically tracked by using Kalman estimator under variable environments with time. The polarization filter parameters are designed according to the polarization characteristic of the interference, and the polarization filtering is finished in the target cell. The system scheme of adaptive polarization filter is studied and the tracking performance of polarization filter and improvement of angle measurement precision are simulated. The research results demonstrate this technology can effectively suppress the angle cheating interference in guidance radar and is feasible in engineering.

关键词： guidance radar polarization adaptive filter Kalman filtering interference suppression.

Joint DOA and polarization estimation for unequal power sources based on reconstructed noise subspace

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2016年第3期27卷 501-513页

作者： Yong Han Qingyuan Fang Fenggang Yan Ming Jin xiaolin qiao School of Electronics and Information Engineering Harbin Institute of Technology School of Information Science and Technology Shijiazhuang Tiedao University

In most literature about joint direction of arrival（DOA） and polarization estimation, the case that sources possess different power levels is seldom discussed. However, this case exists widely in practical applications, especially in passive radar systems. In this paper, we propose a joint DOA and polarization estimation method for unequal power sources based on the reconstructed noise subspace. The invariance property of noise subspace（IPNS） to power of sources has been proved an effective method to estimate DOA of unequal power sources. We develop the IPNS method for joint DOA and polarization estimation based on a dual polarized array. Moreover, we propose an improved IPNS method based on the reconstructed noise subspace, which has higher resolution probability than the IPNS method. It is theoretically proved that the IPNS to power of sources is still valid when the eigenvalues of the noise subspace are changed artificially. Simulation results show that the resolution probability of the proposed method is enhanced compared with the methods based on the IPNS and the polarimetric multiple signal classification（MUSIC） method. Meanwhile, the proposed method has approximately the same estimation accuracy as the IPNS method for the weak source.

关键词： invariance property of noise subspace(IPNS) joint DOA and polarization estimation multiple signal classification(MUSIC) reconstruction of noise subspace unequal power sources

A Method for Rapid Matching Based on Second Order Partial Derivative

在线全文

学校读者我要写书评

暂无评论

Wireless Sensor Network 2010年第1期2卷 37-42页

作者： Haiyan YU Zhiquan ZHOU Zhanfeng ZHAO xiaolin qiao 不详

Our goal is to enhance matching speed which is important for image engineering. Second Partial Derivative operator in Harris corner detector is directly used to compute the similarity between corners. Then initial matches are obtained. The algorithm is contrasted with normalized cross-correlation and method based on horizontal and vertical gradient. Its computational complexity is reduced and matching speed is improved effectively because this method only adopts the addition and subtraction operations. Experiments on several real images test the matching speed, the matching precision and matching rate of the algorithm. The results demonstrate that the algorithm not only have higher speed but also get higher matching precision and correct matching rate. Even though the stereo image pairs have brightness differences, it still performs rather well.

关键词： Corner Matching Gradient Operator Similarity

基于频率捷变和RCS加权抑制雷达角闪烁的研究

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

系统工程与电子技术 2001年第4期23卷 54-57页

作者：乔晓林肖渺金铭哈尔滨工业大学 150001

角闪烁是雷达目标后向散射特性的重要物理量 ,它能严重降低毫米波末制导雷达的导引精度。介绍了一种利用RCS和角闪烁之间的相关性抑制角闪烁的RCS加权方法。为实现这一方法 ,采用了频率捷变技术来获取目标回波信号的多个独立样本。仿真... 详细信息

角闪烁是雷达目标后向散射特性的重要物理量 ,它能严重降低毫米波末制导雷达的导引精度。介绍了一种利用RCS和角闪烁之间的相关性抑制角闪烁的RCS加权方法。为实现这一方法 ,采用了频率捷变技术来获取目标回波信号的多个独立样本。仿真结果显示 ,经过 4至 5个脉冲的处理 ,角闪烁的均方根线偏差从 5m～ 6m降至不到 1m。

关键词：毫米波雷达频率捷变加权抑制角闪烁