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A New Technique for Improving the Anti-jamming Performance of Vector Tracking Loop

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A New Technique for Improving the Anti-jamming Performance o...

第九届中国卫星导航学术年会

作者： Ruihua Zhang renbiao wu Qiongqiong Jia Tianjin Key Lab for Advanced Signal Processing Civil Aviation University of China

The GNSS is vulnerable so that it often faces the risk of jamming,and blanket jamming is one of the *** inversion algorithm is a commonly method used to solve this problem,however,the receiver will lose lock when GNSS satellites are close to RFI *** improve the receiver’s anti-jamming performance in this harsh scene,a method of vector tracking loop(VTL) based on despread-respread(DR) algorithm is ***,this paper suppress oppressive ***,local reference signal is reconstructed according to predicted tracking loop ***,beamforming algorithm is *** analysis and simulation experiments verify that the VTL based on DR algorithm can reduce phase discriminator output errors,improve receiver’s positioning performance,and has superior anti-jamming performance in harsh *** method proposed in this paper can be applied to arbitrary array without prior information of satellites’ directions and is not sensitive to the error of *** to VTL based on EIG,VTL based on DR algorithm has lower complexity.

关键词： Vector tracking loop Anti-jamming Despread-respread algorithm Beamforming algorithm

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基于奇异协方差矩阵的谱估计方法

清华大学学报（自然科学版） 2008年第1期48卷 55-58页

作者：苏志刚彭应宁吴仁彪清华大学电子工程系北京100084 中国民航大学智能信号与图像处理天津市重点实验室天津300300

为了解决秩亏RCF(robust Capon filter-bank)谱估计方法的估计性能不稳健问题,提出一种基于奇异协方差矩阵的谱估计方法。该方法根据空间约束和导向矢量误差约束获得相应的窄带滤波器,并利用其对Capon滤波矢量进行滤波得到谱估计。仿真... 详细信息

为了解决秩亏RCF(robust Capon filter-bank)谱估计方法的估计性能不稳健问题,提出一种基于奇异协方差矩阵的谱估计方法。该方法根据空间约束和导向矢量误差约束获得相应的窄带滤波器,并利用其对Capon滤波矢量进行滤波得到谱估计。仿真结果表明:在采样协方差矩阵奇异的情况下,该谱估计方法获得的谱估计在精度及分辨率上均明显优于秩亏RCF谱估计方法。该方法是一种可以利用少量快拍进行谱估计的有效方法。

关键词：雷达数据处理谱估计匹配滤波

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载机偏航下基于广义相邻多波束自适应处理的低空风切变风速估计

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电子与信息学报 2019年第7期41卷 1728-1734页

作者：李海李怡静吴仁彪中国民航大学天津市智能信号与图像处理重点实验室

该文提出一种载机偏航下基于广义相邻多波束(GMB)自适应处理的低空风切变风速估计的方法,该方法首先利用基于回波数据的杂波距离依赖性补偿方法对杂波进行距离依赖性矫正,估计出杂波协方差矩阵。然后同时组合空域的相邻多个波束与时域... 详细信息

该文提出一种载机偏航下基于广义相邻多波束(GMB)自适应处理的低空风切变风速估计的方法,该方法首先利用基于回波数据的杂波距离依赖性补偿方法对杂波进行距离依赖性矫正,估计出杂波协方差矩阵。然后同时组合空域的相邻多个波束与时域的相邻多个多普勒通道来计算降维变换矩阵,并对待测距离单元内的雷达回波数据进行降维处理,进而构造GMB自适应处理器的最优自适应权矢量对降维后的回波数据实现自适应滤波。最后完成载机偏航下风场速度的准确估计。仿真结果验证了该方法能够在载机偏航情况下,获得风场速度的有效估计。

关键词：机载气象雷达载机偏航低空风切变广义相邻多波束风速估计

低复杂度的ADS-B抗干扰阵列天线无源校正算法

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系统工程与电子技术 2017年第9期39卷 1915-1920页

作者：王文益朱特吴仁彪中国民航大学天津市智能信号与图像处理重点实验室天津300300

阵列的幅相误差、位置误差和互耦使真实阵列流形与理想阵列流形有较大偏差,校正这3种误差可以明显提高阵列的性能。针对广播式自动相关监视(automatic dependent surveillance-broadcast,ADS-B)系统,提出了一种同时校正上述3种误差的无... 详细信息

阵列的幅相误差、位置误差和互耦使真实阵列流形与理想阵列流形有较大偏差,校正这3种误差可以明显提高阵列的性能。针对广播式自动相关监视(automatic dependent surveillance-broadcast,ADS-B)系统,提出了一种同时校正上述3种误差的无源校正算法。通过阵列天线的位置和飞机位置获取校正源的来向信息,并利用该来向信息最终进行误差校正。与其他方法相比,所提方法大大减少了校正阵列的复杂度。仿真结果表明了该算法的有效性。

关键词：阵列校正幅相误差位置误差互耦

基于RELAX的空中多机动目标检测与参数估计

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航空学报 2013年第4期34卷 873-881页

作者：李海王小寒吴仁彪中国民航大学天津市智能信号与图像处理重点实验室天津300300

针对机载雷达空中多机动目标的检测问题,提出了一种基于RELAX算法的空中多机动目标检测与参数估计方法。该方法将重构时间采样技术与RELAX算法相结合,有效地抑制了检测过程中强信号分量对弱信号分量的影响,在待测单元内存在多个目标时,... 详细信息

针对机载雷达空中多机动目标的检测问题,提出了一种基于RELAX算法的空中多机动目标检测与参数估计方法。该方法将重构时间采样技术与RELAX算法相结合,有效地抑制了检测过程中强信号分量对弱信号分量的影响,在待测单元内存在多个目标时,能够获得很好的参数估计结果,并且在脉冲点数有限的情况下,该方法得到的参数估计精度依然很高。同时,本文还推导了空中多机动目标参数估值的克拉美罗界(CRB),为估计结果提供了理论下限。仿真结果证明了该方法的有效性。

关键词：机载雷达机动目标检测空时自适应处理 RELAX 重构时间采样

基于多通道联合自适应处理的微下击暴流中心风速估计方法

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电子与信息学报 2017年第7期39卷 1619-1625页

作者：李海周盟陈筱浅吴仁彪中国民航大学天津市智能信号与图像处理重点实验室天津300300

针对机载气象雷达下视探测微下击暴流时,有用气象信号会淹没在强杂波背景中的问题,该文提出一种基于多通道联合自适应处理的、能够用于分布式气象目标中心风速估计的降维处理器结构。该处理器通过前置的窄带多普勒滤波将全空时杂波局域... 详细信息

针对机载气象雷达下视探测微下击暴流时,有用气象信号会淹没在强杂波背景中的问题,该文提出一种基于多通道联合自适应处理的、能够用于分布式气象目标中心风速估计的降维处理器结构。该处理器通过前置的窄带多普勒滤波将全空时杂波局域化为特定多普勒通道下的定向有源干扰,然后在空域逐多普勒通道进行自适应处理,最后利用频率质心法求取中心风速估计。仿真结果表明,在强杂波背景下,所提方法可以获得较为精确风场速度估计结果,由于采用了降维结构,较最优处理器在运算量上有了明显减少。

关键词：机载气象雷达微下击暴流风速估计多通道联合自适应处理

Spoofing Jamming Suppression Techniques for GPS Based on DOA Estimating

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Spoofing Jamming Suppression Techniques for GPS Based on DOA...

Wavelet Packet Transformation Based Technique in Mitigation DME Pulsed Interference for GNSS

第五届中国卫星导航学术年会

作者： Yaotian Zhang Lu Wang Wenyi Wang Dan Lu renbiao wu Tianjin Key Lab for Advanced Signal Processing Civil Aviation University of China

ISBN: (纸本)9783642547362

This paper studies GPS receiver anti-spoofing jamming problems. Unlike blanket jamming, spoofing jamming is hidden because its power level below noise floor. Besides, spoofing jamming has the same format with satellite signals. A designed spoofing jamming can guide GPS receiver positioning errors occurred and change its navigation line. The existing jamming suppression methods of satellite navigation systems are more suitable for blanket jamming suppression, while for spoofing jamming suppression, these methods are almost invalid. The current published literature make the spoofing jamming detection technology as the major research direction, and rarely involve how to suppress spoofing jamming. This paper analyzes the characteristics of repeater spoofing jamming. For one and multiple of repeater spoofing jamming scenarios, beam forming and RELAX algorithm are proposed to estimate the DOA （Direction of Arrival） of spoofing jamming respectively. After detecting the DOA of spoofing jamming, GPS receiver can steer nulling to the direction of spoofing jamming and suppress spoofing jamming by constructing the projection matrix of spoofing jamming. Simulation experiments prove the correctness and the effectiveness of the two methods.

关键词： GPS receiver · spoofing suppression · beam forming · RELAX algorithm

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Wavelet Packet Transformation Based Technique in Mitigation ...

Power minimization with derivative constraints for high dynamic GPS interference suppression

第五届中国卫星导航学术年会

作者： Liuli Li Wenyi Wang Dan Lu Lu Wang renbiao wu Tianjin Key Lab for Advanced Signal Processing Civil Aviation University of China Tianjin China

ISBN: (纸本)9783642547362

The Galileo E5 and GPS L5 signals are important components of GNSS, however, the Galileo E5 and GPS L5 signals lie within the Aeronautical Radio Navigation Service （ARNS） band, where Distance Measuring Equipment （DME） works in, and strong pulsed interference originating from DME stations can degrade the performance of GNSS receivers. At high altitude, the worse DME interference environment is. Because the similarity between wavelet and DME pulse is higher than that of the GNSS signals, it is easier to detect and remove interference in wavelet packet domain. Although the wavelet packet transformation （WPT） based DME pulse mitigation had been proposed, but the parameters about WPT are not discussed systematically which pay important role in mitigation performance. This paper mainly discusses the parameters selection about WPT including wavelet, composition level, threshold rules and thresholding function. Mitigation Performance are assessed with respect to threshold rules and threholding function by Numerical experiments.

关键词： GNSS·DME·Wavelet packet transformation·Pulsed interference mitigation

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Science China(Information Sciences) 2012年第4期55卷 857-866页

作者： wu renbiao 1,2,LI Chan 1 & LU Dan 1 1 Tianjin Key Laboratory for Advanced Signal Processing,Civil Aviation University of China,Tianjin 300300,China 2 Intelligent Information Institute of ATR Lab,Shenzhen University,Shenzhen,518060,China Tianjin Key Laboratory for Advanced Signal Processing Civil Aviation University of China Intelligent Information Institute of ATR Lab Shenzhen University

In this paper,a novel adaptive interference suppression algorithm is proposed for high dynamic GPS (global positioning system) *** new method incorporates derivative constraints on the inter-ference DOA (direction of arrival) into power minimization approach,which could broaden the width of nulls in the interferences directions and adapt to the rapid change of the interference *** with the traditional wide nulling algorithm based on the derivative constraints,the new method does not have to know or estimate the DOAs of the desired signal and the *** new method is firstly discussed in the context of spatial processing,and then extended to space-time adaptive processing to mitigate wideband diffusive multipath *** of the new method is verified via simulation examples.

关键词： GPS interference cancellation adaptive arrays space-time adaptive processing high dynamic GPS receiver