Frequency modulated continuous wave(FMCW)radar is an advantageous sensor scheme for target estimation and environmental perception.However,existing algorithms based on discrete Fourier transform(DFT),multiple signal c...Frequency modulated continuous wave(FMCW)radar is an advantageous sensor scheme for target estimation and environmental perception.However,existing algorithms based on discrete Fourier transform(DFT),multiple signal classification(MUSIC)and compressed sensing,etc.,cannot achieve both low complexity and high resolution simultaneously.This paper proposes an efficient 2-D MUSIC algorithm for super-resolution target estimation/tracking based on FMCW radar.Firstly,we enhance the efficiency of 2-D MUSIC azimuth-range spectrum estimation by incorporating 2-D DFT and multi-level resolution searching strategy.Secondly,we apply the gradient descent method to tightly integrate the spatial continuity of object motion into spectrum estimation when processing multi-epoch radar data,which improves the efficiency of continuous target tracking.These two approaches have improved the algorithm efficiency by nearly 2-4 orders of magnitude without losing accuracy and resolution.Simulation experiments are conducted to validate the effectiveness of the algorithm in both single-epoch estimation and multi-epoch tracking scenarios.展开更多
本文以空间任意分布的传感器阵列为例,提出一种有效的二维波达方向(Two-Dimensional Direction of Arrival,2D DOA)检测算法。在分析MUSIC算法原理以及谱峰分布特征的基础上,通过步长设置,由局部逐步逼近全局最优,成功进行2D DOA检测,...本文以空间任意分布的传感器阵列为例,提出一种有效的二维波达方向(Two-Dimensional Direction of Arrival,2D DOA)检测算法。在分析MUSIC算法原理以及谱峰分布特征的基础上,通过步长设置,由局部逐步逼近全局最优,成功进行2D DOA检测,避免了穷尽搜索。仿真结果表明,在信噪比、快拍数、阵元个数变化下本文算法具有很高的检测效率。展开更多
It is a great challenge to use digital technology to inherit and reproduce Xinjiang Qiuci music and dance authentically. The thesis displays the cultural beauty of Qiuci music and dance through the change of vector im...It is a great challenge to use digital technology to inherit and reproduce Xinjiang Qiuci music and dance authentically. The thesis displays the cultural beauty of Qiuci music and dance through the change of vector images controlled by bones. The concrete methods are： first, get video images, do edge detection; then set up 2D character model based on anime studio, and build the skeleton according to the level, make key frames; finally use vector animation performance with the help of platform. Compared with Flash, this method is more flexible and natural. By setting up the skeleton libraries, it could lay the foundation for intellectualized design animation performance.展开更多
针对通信感知一体化(Integrated Sensing and Communication,ISAC)系统中基于正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)不同星座概率调制的目标距离、速度与角度估计面临的时延-多普勒耦合及波形适配性不明确等问...针对通信感知一体化(Integrated Sensing and Communication,ISAC)系统中基于正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)不同星座概率调制的目标距离、速度与角度估计面临的时延-多普勒耦合及波形适配性不明确等问题,文中提出了一种融合二维快速傅里叶变换(2D-FFT)与多重信号分类(Multiple Signal Classification,MUSIC)算法的联合参数估计算法。首先,设计了基于2D-FFT的距离与速度估计算法,通过频域-时域联合变换解耦时延-多普勒耦合项,实现多目标场景下的参数分离;其次,利用MUSIC算法对ISAC信号进行处理,基于子空间正交性提升到达角(Angle of Arrival,AoA)估计精度;最后,通过仿真对比了通信最优的复高斯分布与感知最优的QPSK两种星座分布下的性能。结果表明,所提算法可有效实现目标参数的高精度估计,且在相同信噪比下QPSK星座的估计精度优于复高斯分布。本文研究为OFDM-based ISAC系统的参数估计算法设计与波形选择提供了理论依据与仿真支撑。展开更多
随着雷达干扰机应用需求的日益增加,传统阵列设计与测向算法存在以下关键局限:均匀阵列信息冗余度过高、阵列物理孔径受限导致估计精度受限、对相干信号源处理性能显著劣化。为此,本文提出了一种基于空间平滑预处理与MUSIC(Multiple Sig...随着雷达干扰机应用需求的日益增加,传统阵列设计与测向算法存在以下关键局限:均匀阵列信息冗余度过高、阵列物理孔径受限导致估计精度受限、对相干信号源处理性能显著劣化。为此,本文提出了一种基于空间平滑预处理与MUSIC(Multiple Signal Classification,多重信号分类)算法的二维复合均匀阵列相干信号DOA(Direction of Arrival,到达方向)估计方法,旨在突破传统阵列设计的限制,以及解决相干信号带来的DOA性能下降问题。具体而言,空间平滑技术利用均匀阵列的平移不变特性,有效改善相干信号引起的协方差矩阵秩亏损问题;二维复合均匀阵列通过稀疏化阵列排布,在相同阵元数量条件下扩展有效孔径,从而提升DOA估计的分辨率。在实验中,结合二维空间平滑方法和MUSIC算法,在二维复合均匀阵列上对相干信号进行DOA测向,结果表明:空间平滑方法有效抑制了相干信号的干扰,且二维复合均匀阵列较传统均匀阵列在相同阵元规模下展现出更优的DOA估计性能,验证了方法的有效性。展开更多
基金funded by the National Natural Science Foundation of China,grant number 42074176,U1939204。
文摘Frequency modulated continuous wave(FMCW)radar is an advantageous sensor scheme for target estimation and environmental perception.However,existing algorithms based on discrete Fourier transform(DFT),multiple signal classification(MUSIC)and compressed sensing,etc.,cannot achieve both low complexity and high resolution simultaneously.This paper proposes an efficient 2-D MUSIC algorithm for super-resolution target estimation/tracking based on FMCW radar.Firstly,we enhance the efficiency of 2-D MUSIC azimuth-range spectrum estimation by incorporating 2-D DFT and multi-level resolution searching strategy.Secondly,we apply the gradient descent method to tightly integrate the spatial continuity of object motion into spectrum estimation when processing multi-epoch radar data,which improves the efficiency of continuous target tracking.These two approaches have improved the algorithm efficiency by nearly 2-4 orders of magnitude without losing accuracy and resolution.Simulation experiments are conducted to validate the effectiveness of the algorithm in both single-epoch estimation and multi-epoch tracking scenarios.
文摘本文以空间任意分布的传感器阵列为例,提出一种有效的二维波达方向(Two-Dimensional Direction of Arrival,2D DOA)检测算法。在分析MUSIC算法原理以及谱峰分布特征的基础上,通过步长设置,由局部逐步逼近全局最优,成功进行2D DOA检测,避免了穷尽搜索。仿真结果表明,在信噪比、快拍数、阵元个数变化下本文算法具有很高的检测效率。
基金Supported by National Natural Science Foundation of China(61163044)Xinjiang Uygur Autonomous Xinjiang Science and Technology Projects(201191215)Philosophy and Social key Fund Project(12AZD118,12AZD120)
文摘It is a great challenge to use digital technology to inherit and reproduce Xinjiang Qiuci music and dance authentically. The thesis displays the cultural beauty of Qiuci music and dance through the change of vector images controlled by bones. The concrete methods are： first, get video images, do edge detection; then set up 2D character model based on anime studio, and build the skeleton according to the level, make key frames; finally use vector animation performance with the help of platform. Compared with Flash, this method is more flexible and natural. By setting up the skeleton libraries, it could lay the foundation for intellectualized design animation performance.
文摘针对通信感知一体化(Integrated Sensing and Communication,ISAC)系统中基于正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)不同星座概率调制的目标距离、速度与角度估计面临的时延-多普勒耦合及波形适配性不明确等问题,文中提出了一种融合二维快速傅里叶变换(2D-FFT)与多重信号分类(Multiple Signal Classification,MUSIC)算法的联合参数估计算法。首先,设计了基于2D-FFT的距离与速度估计算法,通过频域-时域联合变换解耦时延-多普勒耦合项,实现多目标场景下的参数分离;其次,利用MUSIC算法对ISAC信号进行处理,基于子空间正交性提升到达角(Angle of Arrival,AoA)估计精度;最后,通过仿真对比了通信最优的复高斯分布与感知最优的QPSK两种星座分布下的性能。结果表明,所提算法可有效实现目标参数的高精度估计,且在相同信噪比下QPSK星座的估计精度优于复高斯分布。本文研究为OFDM-based ISAC系统的参数估计算法设计与波形选择提供了理论依据与仿真支撑。
文摘随着雷达干扰机应用需求的日益增加,传统阵列设计与测向算法存在以下关键局限:均匀阵列信息冗余度过高、阵列物理孔径受限导致估计精度受限、对相干信号源处理性能显著劣化。为此,本文提出了一种基于空间平滑预处理与MUSIC(Multiple Signal Classification,多重信号分类)算法的二维复合均匀阵列相干信号DOA(Direction of Arrival,到达方向)估计方法,旨在突破传统阵列设计的限制,以及解决相干信号带来的DOA性能下降问题。具体而言,空间平滑技术利用均匀阵列的平移不变特性,有效改善相干信号引起的协方差矩阵秩亏损问题;二维复合均匀阵列通过稀疏化阵列排布,在相同阵元数量条件下扩展有效孔径,从而提升DOA估计的分辨率。在实验中,结合二维空间平滑方法和MUSIC算法,在二维复合均匀阵列上对相干信号进行DOA测向,结果表明:空间平滑方法有效抑制了相干信号的干扰,且二维复合均匀阵列较传统均匀阵列在相同阵元规模下展现出更优的DOA估计性能,验证了方法的有效性。
