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Multiple targets vector miss distance measurement accuracy based on 2-D assignment algorithms

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Journal of Systems Engineering and Electronics 2008年第1期19卷 76-80页

作者： Fang Bingyi wu siliang Dept. of Electronic Engineering Beijing Inst. of Technology Beijing 100081 P. R. China

An extension of 2-D assignment approach is proposed for measurement-to-target association for improving multiple targets vector miss distance measurement accuracy. When the multiple targets move so closely, the measurements can not be fully resolved due to finite resolution. The proposed method adopts an auction algorithm to compute the feasible measurement-to-target assignment with unresolved measurements for solving this 2-D assignment problem. Computer simulation results demonstrate the effectiveness and feasibility of this method.

关键词： miss distance 2-D assignment auction algorithm data association

土木工程专业学生解决复杂工程问题能力的培养——基于事故案例分析的课程教学探索

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实验室研究与探索 2024年第8期43卷 180-184页

作者：李永华陈宝魁吴斯亮南昌大学工程建设学院南昌330031

以“土木工程电算实训”课程为例,以工程事故案例为载体,将培养学生解决复杂工程问题实践能力嵌入课程目标体系。采用实验仿真方式实施教学,培养学生综合运用力学原理将工程案例合理抽象化,建立正确的力学分析模型及设定合理的边界条件... 详细信息

以“土木工程电算实训”课程为例,以工程事故案例为载体,将培养学生解决复杂工程问题实践能力嵌入课程目标体系。采用实验仿真方式实施教学,培养学生综合运用力学原理将工程案例合理抽象化,建立正确的力学分析模型及设定合理的边界条件的能力,同时培养学生全面掌握工程问题及把控关键工程问题的能力。最后以学生学习效果为中心构建课程教学评价体系,多年来的教学实践表明该方法能充分培养学生独立思考的能力,有助于学生将碎片化的知识点融会贯通。

关键词：复杂工程问题工程认证事故案例实验教学

A modified code tracking loop based on dual structure

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Science China(Information Sciences) 2015年第8期58卷 77-86页

作者： WANG Pai WANG YongQing wu siliang Department of Information and Electronics Beijing Institute of Technology

A modified code tracking loop for tracking the pseudo-random noise code in direct sequence spread spectrum signal is proposed. The modified loop differs from the typical through imposing a dual structure which incorporates a coarse loop with large loop parameters and an accurate loop with small loop parameters. The expression of the convergence time for the second-order delay-locked loop(DLL) is derived to measure the time of the convergence process. Two concepts, accuracy improvement and time improvement are defined to exhibit the performance enhancement of the modified loop. Simulation results show that the proposed method can realize a better trade-off between tracking accuracy and convergence time in the whole simulated carrier-to-noise ratio range. Also, the robustness of the modified loop is verified through eliminating the second convergence process which is regarded as the worst issue in the parameter-switching DLL.

关键词： direct sequence spread spectrum code tracking loop delay locked loop convergence time tracking accuracy

Improved direct P code acquisition technique

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Journal of Systems Engineering and Electronics 2009年第5期20卷 948-953页

作者： Xu Ying Wang Ju wu siliang Academy of Opto-Electronics Chinese Academy of Science Beijing 100190 P. R. China School of Information Science and Technology Beijing Inst. of Technology Beijing 100081 P. R. China

P code direct acquisition is an important technology in satellite navigation system. As the P code has a long period, it is hard to directly acquire. The traditional average method can process multiple code phases in a time to shorten the acquisition time. But with the increase of average phase error of the input signal and the local code, the correlation signal-to-noise ratio （SNR） loss increases. To reduce the SNR loss, an improved average method is introduced. A new sequence is generated with a summation of phase shifting sequences to decrease correlation peak loss. Simulation results show that compared with direct average method, the improved average method effectively increases correlation SNR.

关键词： P code acquisition direct average algorithm improved average algorithm.

Principle and key technology of generalized high precision simulation of TT&C channel

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Journal of Systems Engineering and Electronics 2013年第2期24卷 318-323页

作者： Yang Zhou Zhe Zheng siliang wu School of Information and Electronics Beijing Institute of Technology

A generalized simulation method of the tracking,telemetry and control（TT＆C） channel,which is applicable to wideband and arbitrary radio frequency（RF） signal,is *** can accurately simulate the dynamic transmission delay of the arbitrary RF signal in channels,especially regardless of any prior knowledge including signal form,signal parameters,and so *** proposed method orthogonally demodulates the wideband and arbitrary RF signal to complex baseband by a known local oscillator（LO） ***,it takes measures to obtain the delay reconstruction signal of baseband signals based on the dynamic transmission delay between a ground station and a ***,it manages to obtain the delay reconstruction signal of LO *** simulation output signal（the delayed RF signal） can be achieved through the synthesis of the two delay reconstruction signals mentioned *** principle and its related key technology are described in detail,and the realizable system architecture is given.

关键词： generalization channel simulation high precision dynamic delay reconstruction dynamic delay cancellation

Narrow-band interference excision in spread-spectrum systems using new N-sigma algorithm based on fuzzy threshold

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Journal of Systems Engineering and Electronics 2009年第1期20卷 20-26页

作者： Feng Jining wu siliang Wang Ju Dept. of Electronic Engineering Beijing Inst. of Technology Beijing 100081 P. R. China Dept. of Electronic Engineering Hebei Normal Univ. Shijiazhuang 050031 P. R. China

The key to narrow-band interference excision in frequency domain is to determine the excision thresh- old in direct-sequence spread-spectrum （DS-SS） systems. The excision threshold is a non-linear function related to the number and the power of interference, and attempting to get the exact relation of threshold related to the number and the power of interference is almost impossible. The N-sigma algorithm determines the excision threshold using subsection function; however, the excision threshold determined by this method is not exact. A new method to determine the threshold of N-sigma algorithm is proposed. The new method modifies the scale factor N by use of the membership function. The threshold determined by this method is consecutive and smooth, and it is closer to the fact than that of the initial N-sigma algorithm. The GPS signal and single-tone （CW） interference （that is, typical narrow-band interference） are implemented in the simulation, and the results are presented to demonstrate the validity of the new algorithm.

关键词： direct-sequence spread-spectrum systems adaptive frequency domain interference suppression fuzzyfunction GPS signal.

Signal Delay Reconstruction Method Based on Dynamic Index and Complex-Coefficient Lagrange Interpolation

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Chinese Journal of Electronics 2015年第4期24卷 750-754页

作者： ZHOU Yang ZHENG Zhe wu siliang School of Information and Electronics Beijing Institute of Technology

This paper presents a large-range, highprecision and continuously variable delay reconstruction method for wideband and arbitrary bandlimited signal,which combines dynamic index technique with complexcoefficient Lagrange interpolation technique. The method samples time-continuous bandlimited signal and stores samples in sequence. It manages to obtain the highprecision delay parameters of every sampling period from desired delay to compute the so-called index position variable and interpolator parameters. It dynamically indexes and chooses a set of samples to implement piecewise complex-coefficient Lagrange interpolation for reconstructing the delayed sequences. The time-continuous delay reconstruction signal can be simply accomplished through digital-to-analog conversion. The mathematical model of the method and its transformed form is given, and the arithmetic of dynamic index and complex-coefficient Lagrange interpolation is derived. Simulation and test results show the validity and performance of the method.

关键词： Signal delay reconstruction Continuously variable delay Dynamic index Complex-coefficient Lagrange interpolation

Long term integration algorithm for high-dynamic targets

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Journal of Systems Engineering and Electronics 2016年第5期27卷 979-985页

作者： Gang Yang Haikun Luo Jing Tian siliang wu School of Information and Electronics Beijing Institute of TechnologyBeijing 100081China Beijing Institute of Remote Sensing Equipment Beijing 100854China Science and Technology on Electronic Information Control Laboratory Chengdu 610036China

A new long term integration algorithm is proposed forhigh-dynamic targets, which can resolve the problems of spectrumspread, frequency walk and pseudorandom noise （PRN）code phase curvature caused by the motion of targets. This algorithmfirst applies a keystone transform based improved discretepolynomial-phase transform （KT-IDPT） to estimate the Dopplerchirp rate. Then, based on the estimated Doppler chirp rate,dechirping and envelope translation are performed on the partialcorrelation results to correct the spectrum spread and the codephase curvature. The simulation results demonstrate that the proposedmethod has low integration loss and computational burden.

关键词： High-dynamic target long term integration motioncompensation.

A New Adaptive Subsample ETDE for Large-Range Time-Varying Delay Estimation Using Low-Order Interpolators

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Chinese Journal of Electronics 2017年第4期26卷 871-875页

作者： ZHENG Zhe ZHOU Yang wu siliang School of Information and Electronics Beijing Institute of Technology

We present a new adaptive subsample Explicit time delay estimator(ETDE) that is well suitable for determining and tracking the large-range time-varying delay between two noisy bandlimited signals only using low-order interpolators. Unlike conventional ETDE where a Fractional delay filter(FDF) is used, the new ETDE is based on a novel on-line interpolator which has the ability to optimally synthesize any continuously variable nonintegral sample delay. The theoretical derivations for our proposed on-line interpolator and the new ETDE algorithm are provided. Simulations are presented to evaluate the performance of the new estimator and to compare the performance with other estimators. Simulation results show that the new ETDE significantly outperforms FDF-based ETDE when the delay is large or varies in a large range,and the same filter orders are used.

关键词： Explicit time delay estimator(ETDE) On-line interpolation Large-range delay Subsample TDE