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| 1 | Joint TDOA and AOA location algorithm显示文摘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,respectively.The problem is solved perfectly by calculating the target position with the joint TDOA and AOA location.On 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 target.In 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 target.Simultaneously,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. | Congfeng Liu Jie Yang Fengshuai Wang | 2013 | Journal of Systems Engineering and Electronics2013，24，2： | 30 |
| 2 | Direct solution for fixed source location using well-posed TDOA and FDOA measurements显示文摘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. | LIU Congfeng YUN Jinwei SU Juan | 2020 | Journal of Systems Engineering and Electronics2020，31，4： | 5 |
| 3 | A Joint TDOA/FDOA Localization Algorithm Using Bi-iterative Method with Optimal Step Length显示文摘In order to improve the estimation accuracy of multi-station joint Time difference of arrive/Frequency difference of arrive(TDOA/FDOA) location with Bi-Iterative method, a solution for the position of target with Gauss-Newton optimal step length is proposed in this paper. First, get the initial estimation of target based on Two-stage weighted least-squares(TSWLS)algorithm, and then alternately solve the position and velocity of the target with Bi-Iterative method. In this paper, Gauss-Newton method is applied to iteratively solve the target position, including the detailed equations of the descending direction and the optimal iterative step length in each iterative process. Simulations are carried out to examine the algorithm’s performance by comparing it with TSWLS method and Gauss-Newton method regardless of the step length. The results show that when Gauss noise variance is small, the estimation accuracy is close to Cramer Rao lower bound(CRLB) and the proposed method performs better than the other two methods. In addition, because the model which includes the position and velocity of the observation station and the target is in line with the over-the-horizon reality scene in this paper,our research has certain practical value. | LIU Congfeng YUN Jinwei | 2021 | Chinese Journal of Electronics2021，30，1： | 4 |
| 4 | The parametric symmetry and numbers of the entangled class of 2×M×N system显示文摘We present in the work two intriguing results in the entanglement classification of a pure and true tripartite entangled state of 2 × M × N under stochastic local operation and classical communication: (i) the internal symmetric properties of the nonlocal parameters in the continuous entangled class; (ii) the analytic expression for the total numbers of the true and pure entangled class 2 × M × N states. These properties help better understand the nature of the 2 × M × N entangled system. | LI XiKun LI JunLi LIU Bin QIAO CongFeng | 2011 | Science China(Physics,Mechanics & Astronomy)2011，54，8： | 2 |
| 5 | ISAR active jamming method based on sinusoidal modulation显示文摘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 coherent 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 sinusoidal 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. | Yu Zhang Congfeng Liu Yan Zhu | 2015 | Journal of Systems Engineering and Electronics2015，26，4： | 1 |
| 6 | Robust capon beamformer under norm constraint显示文摘 | Liu Congfeng Liao Guisheng | | 0，，06： | 1 |
| 7 | POLYNOMIAL COEFFICIENT FINDING FOR ROOT-MUSIC显示文摘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. | Liu Xiaojun Liu Congfeng Liao Guisheng | 2009 | Journal of Electronics(China)2009，26，4： | 1 |
| 8 | A posterior inverted L-shaped approach for the treatment of posterior bicondylar tibial plateau fractures显示文摘 | Xianfeng He Penghan Ye Yong Hu Lei Huang Feng Zhang Guanyi Liu Yongping Ruan Congfeng Luo | 2013 | Archives of Orthopaedic and Trauma Surgery2013，，1： | 1 |
| 9 | Robust LCMP Beamformer with Negative Loading 显示文摘 | Liu Congfeng Yang Jie | 2012 | Progress in Electromagnetics Research2012，130，： | 1 |
| 10 | COMPARISON OF TDOA LOCATION ALGORITHMS WITH DIRECT SOLUTION METHOD显示文摘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 location.Therein,the solving methods are realized in the rectangular and polar coordinates.On 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 target.In 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 obtained.Simultaneously,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. | Li Chun Liu Congfeng Liao Guisheng | 2011 | Journal of Electronics(China)2011，28，4： | 1 |
| 11 | Canonical framework for multi-channel SAR-GMTI显示文摘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 multi-channel SAR-GMTI has the complex central Wishart distribution of 1×1 case, namely the χ2 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. | Liu Congfeng Liao Guisheng | 2008 | Journal of Systems Engineering and Electronics2008，19，5： | 0 |
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