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Unscented extended Kalman filter for target tracking

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Journal of Systems Engineering and Electronics 2011年第2期22卷 188-192页

作者： Changyun Liu penglang shui Song Li National Laboratory of Radar Signal Processing Xidian University Xi'an 710071 E R. China . Missile College of Air Force Engineering University Sanyuan 713800 P. R. China

A new method of unscented extended Kalman filter （UEKF） for nonlinear system is presented. This new method is a combination of the unscented transformation and the extended Kalman filter （EKF）. The extended Kalman filter is similar to that in a conventional EKF. However, in every running step of the EKF the unscented transformation is running, the deterministic sample is caught by unscented transformation, then posterior mean of non- lineadty is caught by propagating, but the posterior covariance of nonlinearity is caught by linearizing. The accuracy of new method is a little better than that of the unscented Kalman filter （UKF）, however, the computational time of the UEKF is much less than that of the UKF.

关键词： unscented transformation (UT) extended Kalman filter (EKF) unscented extended Kalman filter (UEKF) unscentedKalman filter (UKF) nonliearity.

Performance analysis of multi-channel order statistics detector for range-spread target

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Journal of Systems Engineering and Electronics 2012年第5期23卷 689-699页

作者： Shuwen Xu penglang shui National Laboratory of Radar Signal Processing Xidian UniversityXi'an 710071R R.China

The problem of two order statistics detection schemes for the detection of a spatially distributed target in white Gaussian noise are *** the number of strong scattering cells is known,we first show an optimal detector,which requires many processing *** structure of such optimal detector is ***,a simpler quasi-optimal detector is then *** quasi-optimal detector,called the strong scattering cells’ number dependent order statistics（SND-OS） detector,takes the form of an average of maximum strong scattering cells with a known *** the number of strong scattering cells is unknown in real situation,the multi-channel order statistics（MC-OS） detector is *** each channel,a various number of maximums scattered from target are ***,the false alarm probability analysis and thresholds sets for each channel are given,following the detection results presented by means of Monte Carlo simulation strategy based on simulated target model and three measured *** particular,the theoretical analysis and simulation results highlight that the MC-OS detector can efficiently detect range-spread targets in white Gaussian noise.

关键词： order statistics strong scattering cell multi-channel range-spread target

Modified unscented Kalman filter using modified filter gain and variance scale factor for highly maneuvering target tracking

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Journal of Systems Engineering and Electronics 2014年第3期25卷 380-385页

作者： Changyun Liu penglang shui Gang Wei Song Li National Laboratory of Radar Signal Processing Xidian University College of Air and Missile Defense Air Force Engineering University

To improve the low tracking precision caused by lagged filter gain or imprecise state noise when the target highly maneuvers, a modified unscented Kalman filter algorithm based on the improved filter gain and adaptive scale factor of state noise is presented. In every filter process, the estimated scale factor is used to update the state noise covariance Qk, and the improved filter gain is obtained in the filter process of unscented Kalman filter （UKF） via predicted variance Pk｜k-1, which is similar to the standard Kalman filter. Simulation results show that the proposed algorithm provides better accuracy and ability to adapt to the highly maneuvering target compared with the standard UKF.

关键词： unscented Kalman filter (UKF) target tracking filter gain maneuvering target nonlinearity modified unscented Kalman filter (MUKF).

Improved track-before-detect method for detecting range-spread targets in generalized Pareto clutter

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Science China(Information Sciences) 2019年第4期62卷 44-46页

作者： Jian XUE Shuwen XU penglang shui National Lab of Radar Signal Processing Collaborative Innovation Center of Information Sensing and UnderstandingXidian University Department of Electrical and Computer Engineering Mcmaster University

Dear editor,High-resolution radars demonstrate a good targetdetection performance, especially for weak targets such as periscopes and small boats [1]. Methods for adaptive detection employed by high-resolution

关键词： TBD Improved track-before-detect method for detecting range-spread targets in generalized Pareto clutter SCR

DETECTION OF UNKNOWN NONLINEAR FM SIGNALS BY TIME-FREQUENCY MORPHOLOGICAL FILTERING

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DETECTION OF UNKNOWN NONLINEAR FM SIGNALS BY TIME-FREQUENCY ...

Double-characters detection of nonlinear frequency modulated signals based on FRFT

2006 8th International Conference on Signal Processing

作者： SHANG Haiyan shui penglang ZHANG Shouhong Nation lab.of Radar Signal Processing Xidian University

ISBN: (纸本)0780397371;9780780397378

＜正＞A new energy integration detection scheme is proposed to detect an unknown nonlinear frequency modulated（FM） signal buried in strong complex additive white Gaussian noise（CA WGN）.In this scheme,the Smoothed-Pseudo Wigner-Vill Distribution（SPWVD） is used to realize local coherent integration of a signal and thresholding and mathematical morphological filtering are jointly used to extract the time-frequency（TF） support region of the signal from the time-frequency distribution（TFD） image of an *** simulated results show that the proposed scheme is effective in strong noise background. The scheme can be applied to the target detection in the over-the-horizon radar（OTHR）,such as the sky wave OTHR and the surface wave OTHR.

关键词： SPWVD Energy integration detection Local coherent integration Morphological filtering

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Science China(Information Sciences) 2011年第1期54卷 136-145页

作者： XU ShuWen,shui penglang & YANG XiaoChao National Laboratory of Radar Signal Processing,Xidian University,Xi’an 710071,China National Laboratory of Radar Signal Processing

In many practical applications,signals to be detected are unknown nonlinear frequency modulated (FM)and are corrupted by strong *** phase histories of the nonlinear FM signals are assumed to be unknown smooth functions of time,which are usually poorly modeled or cannot be modeled at all by a small number of *** of the lack of phase model,a nonparametric detection method is proposed based on successive fractional Fourier transform and double-characters *** detection process goes in three ***,an image is constructed by the fractional Fourier transforms of successive angles in one period. Then,the threshold procedure is utilized to transform the image into a binary *** the multiple median filtering,the binary image is refined where the isolated noise pixels are ***,two complementary features are extracted from the refined image,and a double-characters detector is proposed to decide whether the target is present or *** simulation experiments to three polynomial phase signals with different orders and a sinusoidal phase signal show that the proposed detection method is effective and robust.

关键词： fractional Fourier transform double-characters detector nonparametric detection multiple median filtering

广义Pareto分布海杂波背景下非相干检测器恒虚警性能分析

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电子与信息学报 2021年第3期43卷 523-530页

作者：张坤水鹏朗西安电子科技大学雷达信号处理国家重点实验室西安710071

该文在广义Pareto分布海杂波背景下研究了单元平均(CA)和有序统计量(OS)两种非相干检测器的恒虚警(CFAR)性质,推导了两种非相干检测器的虚警概率公式,发现了两种检测器对杂波的尺度参数是恒虚警的。然而,两种检测器对杂波的散斑协方差... 详细信息

该文在广义Pareto分布海杂波背景下研究了单元平均(CA)和有序统计量(OS)两种非相干检测器的恒虚警(CFAR)性质,推导了两种非相干检测器的虚警概率公式,发现了两种检测器对杂波的尺度参数是恒虚警的。然而,两种检测器对杂波的散斑协方差矩阵结构和杂波形状参数是非恒虚警的。为了实现全场景的恒虚警检测,预先通过白化方法将具有相关性的海杂波去相关,并通过查表方法使用了匹配杂波形状参数、累积脉冲数和参考单元数的检测门限。在这种情况下,实验结果表明两种非相干检测器能确保全场景恒虚警。

关键词：广义Pareto分布非相干检测器恒虚警海杂波

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插值子波变换的优化设计

电子学报 1999年第8期27卷 16-18,15页

作者：水鹏朗保铮西安电子科技大学雷达信号处理重点实验室

Ｄｅｓｌａｕｒｉｅｒｓｄｕｂｕｃ子波是一类被广泛采用的插值子波，其不足之处在于系统冗余较大，一般插值子波是Ｄｅｓｌａｕｒｉｅｒｓｄｕｂｕｃ子波的推广，设计上具有更大的灵活性．本文研究了一般插值子波系统的性质、优化... 详细信息

Ｄｅｓｌａｕｒｉｅｒｓｄｕｂｕｃ子波是一类被广泛采用的插值子波，其不足之处在于系统冗余较大，一般插值子波是Ｄｅｓｌａｕｒｉｅｒｓｄｕｂｕｃ子波的推广，设计上具有更大的灵活性．本文研究了一般插值子波系统的性质、优化设计准则以及有效的优化设计方法．最后，通过对实测信号的压缩说明了本文方法的有效性．

关键词：插值子波冗余度优化设计信号处理子波变换

基于相位调制的非均匀DFT调制滤波器组的构造算法

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电子与信息学报 2017年第9期39卷 2169-2174页

作者：周芳水鹏朗西安电子科技大学雷达信号处理国家重点实验室西安710071 桂林电子科技大学生命与环境科学学院桂林541004

由于具有灵活的频率划分能力,非均匀滤波器组在语音、图像等信号的处理中有着广泛的应用。该文针对非均匀DFT调制滤波器组无法直接合并构造的缺点,提出一种基于相位调制的构造方法。在该方法中,非均匀DFT调制滤波器组的子带滤波器由均匀... 详细信息

由于具有灵活的频率划分能力,非均匀滤波器组在语音、图像等信号的处理中有着广泛的应用。该文针对非均匀DFT调制滤波器组无法直接合并构造的缺点,提出一种基于相位调制的构造方法。在该方法中,非均匀DFT调制滤波器组的子带滤波器由均匀DFT调制滤波器组经子带合并和相位调制获得。构造所得的非均匀滤波器组与原均匀滤波器组的重构特性近似相等。同时推导出非均匀子带滤波器具备良好频率特性的条件。理论分析和仿真结果均表明了所提的构造方法的有效性。

关键词：离散傅里叶变换调制非均匀滤波器组子带合并相位调制