检索结果-南通市图书馆

Canonical framework for multi-channel SAR-GMTI

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 2008年第5期19卷 923-928页

作者： liu congfeng Liao Guisheng National Lab of Radar Signal Processing Xidian Univ. Xi'an 710071 P. R. China

Synthetic aperture radar （SAR） systems have become an important tool for fine-resolution mapping and other remote sensing operations. The multi-channel SAR ground moving-target indication （GMTI） must process its data to produce not only the image of surveillance area but also the information of the ground moving-targets. The topic of moving-target detection in clutter has been extensively studied, and there are many methods that are used to detect moving targets, such as displaced phase center antenna （DPCA） method, along-track interfero-metric （ATI） phase, space-time adaptive processing （STAP）, or some other metrics. A canonical framework is proposed that encompasses all the multi-channel SAR-GMT methods, namely, DPCA and ATI. The statistical test metric for multi-channel SAR-GMTI is established in a simple form, via the definition of the complex central Wishart distribution, to deduce the statistics of the test metric, and the probability distribution of the test metric for multichannel SAR-GMTI has the complex central Wishart distribution of 1×1 case, namely the X^2 distribution. The theory foundation offers the possibility to construct the united multi-channel SAR-GMTI detector, and derives the constant false alarm rate （CFAR） detector tests for separating moving targets from clutter.

关键词： multi-channel SAR-GMTI canonical framework displaced phase center antenna along-track interferometrie statistics analysis.

Direct solution for fixed source location using well-posed TDOA and FDOA measurements

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2020年第4期31卷 666-673页

作者： liu congfeng YUN Jinwei SU Juan Research Institute of Electronic Countermeasure Xidian UniversityXi’an 710071China

Based on the time differences of arrival(TDOA) and frequency differences of arrival(FDOA) measurements of the given planar stationary radiation source, the joint TDOA/FDOA location algorithm which solves the location of the target directly is proposed. Compared with weighted least squares(WLS) methods,the proposed algorithm is also suitable for well-posed conditions,and gets rid of the dependence on the constraints of Earth's surface. First of all, the solution formulas are expressed by the radial range. Then substitute it into the equation of the radial range to figure out the radial range between the target and the reference station. Finally use the solution expression of the target location to estimate the location of the target accurately. The proposed algorithm solves the problem that WLS methods have a large positioning error when the number of observation stations is not over-determined. Simulation results show the effectiveness of the proposed algorithm, including effectively increasing the positioning accuracy and reducing the number of observatories.

关键词： passive location joint time differences of arrival/frequency differences of arrival(TDOA/FDOA)location direct solution stationary emitter well-posed equations

Joint TDOA and AOA location algorithm

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2013年第2期24卷 183-188页

作者： congfeng liu Jie Yang Fengshuai Wang Institute of Electronic Countermeasure Xidian University School of Communication and Information Xi'an University of Posts and Telecommunications The 54th Institute of China Electronics Technology Group Corporation

For the joint time difference of arrival（TDOA） and angle of arrival（AOA） location scene,two methods are proposed based on the rectangular coordinates and the polar coordinates,*** problem is solved perfectly by calculating the target position with the joint TDOA and AOA *** the condition of rectangular coordinates,first of all,it figures out the radial range between target and reference stations,then calculates the location of the *** the case of polar coordinates,first of all,it figures out the azimuth between target and reference stations,then figures out the radial range between target and reference stations,finally obtains the location of the ***,simulation analyses show that the theoretical analysis is correct,and the proposed methods also provide the application of the joint TDOA and AOA location algorithm with the theoretical basis.

关键词： passive location joint time difference of arrival (TDOA)and angle of arrival (AOA) location direct solution method perfor-mance analysis.

ISAR active jamming method based on sinusoidal modulation

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2015年第4期26卷 713-719页

作者： Yu Zhang congfeng liu Yan Zhu Key Laboratory of Electronic Information Countermeasure and Simulation Technology Ministry of EducationXidian University

It is potentially useful to perform deception or cover jamming using the rotating angular reflectors since they can form deception echoes along range and azimuth. Inspired by the cohe- rent jamming and micro-motion modulation, a novel active method is proposed for inverse synthetic aperture radar （ISAR）. Radar pulses are sampled and frequency-modulated along azimuth by si- nusoidal signal, and then the jamming signals are retransmitted to the radar and the jamming images are induced after ISAR imaging. Therein, the jamming principle, key parameters and the jamming effect are discussed. The simulated data verify the effectiveness of the jamming method.

关键词： inverse synthetic aperture radar (ISAR) deceptionjamming cover jamming micro-motion modulation sinusoidalmodulation.

POLYNOMIAL COEFFICIENT FINDING FOR ROOT-MUSIC

在线全文

学校读者我要写书评

暂无评论

Journal of Electronics(China) 2009年第4期26卷 543-548页

作者： liu Xiaojun liu congfeng Liao Guisheng National Lab of Radar Signal Processing Xidian University Xian 710071 China

Abs Root-MUSIC （MUltiple Signal Classification） is the polynomial rooting form of MUSIC, namely, the spectrum peak searching is resplaced by the polynomial rooting in MUSIC implementation. The coefficients finding of the polynomial is the critical problem for Root-MUSIC and its improvements By analyzing the Root-MUSIC algorithm thoughly, the finding method of the polynomial coefficient is deduced and the concrete calculation formula is given, so that the speed of polynomial finding roots will get the bigger exaltation. The particular simulations are given and attest correctness of the theory analysis and also indicate that the proposed algorithm has preferable estimating performance.

关键词： Direction Of Arrival (DOA) estimation Root-MUSIC (MUltiple Signal Classification) Polynomial coefficient finding

COMPARISON OF TDOA LOCATION ALGORITHMS WITH DIRECT SOLUTION METHOD

在线全文

学校读者我要写书评

暂无评论

Journal of Electronics(China) 2011年第4期28卷 652-657页

作者： Li Chun liu congfeng Liao Guisheng School of Electronic Engineering Xidian University Xi＇an 710071 China 54th Institute of CETC Shijiazhuang 050081 China

For Time Difference Of Arrival(TDOA) location based on multi-ground stations scene,two direct solution methods are proposed to solve the target position in TDOA ***,the solving methods are realized in the rectangular and polar *** the condition of rectangular coordinates,first of all,it solves the radial range between the target and reference station,then cal-culates the location of the *** the case of polar coordinates,the azimuth between the target and reference station is solved first,then the radial range between the target and reference station is figured out,finally the location of the target is ***,the simulation and comparison analysis are given in detail,and show that the polar solving method has the better fuzzy performance than that of rectangular coordinate.

关键词： Passive location Time Difference Of Arrival(TDOA) location Direct solution method

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

模式匹配与校验和相结合的IP协议识别方法

西安电子科技大学学报 2012年第3期39卷 149-153,165页

作者：杨洁刘聪锋西安邮电学院通信与信息工程学院陕西西安710121 西安电子科技大学电子对抗研究所陕西西安710071

为了减少入侵检测系统中误报和漏报的发生概率,提高对应用层协议进行详细分析的准确率,针对以太网数据包提出了一种将模式匹配算法和IP校验和计算相结合的IP协议识别方法.该方法首先根据IP报头的静态特征对以太数据包进行模式匹配,再结... 详细信息

为了减少入侵检测系统中误报和漏报的发生概率,提高对应用层协议进行详细分析的准确率,针对以太网数据包提出了一种将模式匹配算法和IP校验和计算相结合的IP协议识别方法.该方法首先根据IP报头的静态特征对以太数据包进行模式匹配,再结合报头校验和计算来识别该数据包所属类型是否为IP协议.通过在Visual C++软件环境下运行基于给定数据样本的仿真程序,验证了该方法的正确性和可靠性,从而为上层协议的识别提供了理论基础和识别算法.

关键词：入侵检测 IP协议识别模式匹配校验和

阵元位置误差校正Toeplitz预处理算法

在线全文

学校读者我要写书评

暂无评论

西安电子科技大学学报 2011年第2期38卷 93-98页

作者：杨洁刘聪锋西安邮电学院通信与信息工程学院陕西西安710121 西安电子科技大学电子对抗研究所陕西西安710071

MUSIC等为代表的高分辨DOA算法通常以精确已知的理想阵列模型为前提,由于实际天线阵列的位置误差必然存在,因此算法的性能必将受到严重的影响,甚至失效.本文通过深入分析阵列位置误差对阵列接收数据协方差矩阵的影响,提出了一种基于对... 详细信息

MUSIC等为代表的高分辨DOA算法通常以精确已知的理想阵列模型为前提,由于实际天线阵列的位置误差必然存在,因此算法的性能必将受到严重的影响,甚至失效.本文通过深入分析阵列位置误差对阵列接收数据协方差矩阵的影响,提出了一种基于对接收数据协方差矩阵作Toep litz预处理来校正阵列位置误差的方法,同时结合特征值重构方法进行联合迭代运算,以便更加有效地抑制阵列位置误差的影响.理论分析和计算机仿真表明,所提方法能够有效地改善MUSIC算法的稳健性,提高多目标信号的角度分辨能力.

关键词：阵列位置误差校正子空间类算法 MUSIC算法 Toeplitz处理

在线全文

学校读者我要写书评

暂无评论

迭代频差定位算法及其性能分析

西安电子科技大学学报 2013年第5期40卷 8-14页

作者：杨洁刘聪锋西安邮电大学通信与信息工程学院陕西西安710121 西安电子科技大学电子对抗研究所陕西西安710071

针对频差定位中的运动观测站对固定辐射源的定位场景,提出了基于迭代方法实现目标位置求解的定位算法,解决了基于频差定位方法的目标位置求解问题.所提方法分为载频已知和载频未知两种情况.当载频已知时,利用频差测量方程进行迭代求解... 详细信息

针对频差定位中的运动观测站对固定辐射源的定位场景,提出了基于迭代方法实现目标位置求解的定位算法,解决了基于频差定位方法的目标位置求解问题.所提方法分为载频已知和载频未知两种情况.当载频已知时,利用频差测量方程进行迭代求解目标位置;当载频未知时,利用频率测量方程进行迭代求解目标位置和辐射信号载频.分析了频差定位算法的定位精度并进行了仿真,验证了理论分析的正确性和算法的有效性.

关键词：无源定位频差定位迭代法性能分析