This letter delnonstrates the structure of the passive radar using TV signals. Because the TV signal is a kind of pseudoperiodic signal, the matched filtering of color TV signals would yield high sidelobes which cause...This letter delnonstrates the structure of the passive radar using TV signals. Because the TV signal is a kind of pseudoperiodic signal, the matched filtering of color TV signals would yield high sidelobes which cause the range ambiguity. To overcome this problem, the mismatched filter is proposed to suppress the correlation sidelobcs of matched filtering of TV signals. By utilizing the iteration process, this method could achieve the required peak sidclobc level. The impacts of the noise and target movement on mismatched filtering are also analysed, Simulation results are included to demonstrate the effectiveness of the proposed technique.展开更多
THERE＇S good news for football fans in Africa who have been sighing over the end of 2016 UEFA Eu- ropean Championship, Now they can switch to watch- ing Chinese Super League （CSL）, China＇s highest tier of professi...THERE＇S good news for football fans in Africa who have been sighing over the end of 2016 UEFA Eu- ropean Championship, Now they can switch to watch- ing Chinese Super League （CSL）, China＇s highest tier of professional football, which kicked off its 13th edition in March with the finale scheduled on November 5.展开更多
数字电视前端信号异常,是影响数字电视用户观看效果和质量的重要故障因素。引起数字电视前端信号异常故障的原因是多方面的。对此,主要从混合光纤同轴电缆(Hybrid Fiber Coax,HFC)光电混合网故障、同步数字体系(Synchronous Digital Hie...数字电视前端信号异常,是影响数字电视用户观看效果和质量的重要故障因素。引起数字电视前端信号异常故障的原因是多方面的。对此,主要从混合光纤同轴电缆(Hybrid Fiber Coax,HFC)光电混合网故障、同步数字体系(Synchronous Digital Hierarchy,SDH)主干光纤环网系统问题以及马赛克现象三个方面,具体分析引起这些故障的原因,特别对HFC光电混合网故障和马赛克现象问题的几个不同故障类型进行详细的阐释,并分析故障的排查方法。结合一个故障案例处理过程,介绍数字电视前端信号异常故障的排查流程和解决措施。最后,针对数字电视前端信号异常故障,从前端设备选择及安装等方面提出日常防护措施。展开更多
A compressive near-field millimeter wave(MMW)imaging algorithm is proposed.From the compressed sensing(CS)theory,the compressive near-field MMW imaging process can be considered to reconstruct an image from the under-...A compressive near-field millimeter wave(MMW)imaging algorithm is proposed.From the compressed sensing(CS)theory,the compressive near-field MMW imaging process can be considered to reconstruct an image from the under-sampled sparse data.The Gini index(GI)has been founded that it is the only sparsity measure that has all sparsity attributes that are called Robin Hood,Scaling,Rising Tide,Cloning,Bill Gates,and Babies.By combining the total variation(TV)operator,the GI-TV mixed regularization introduced compressive near-field MMW imaging model is proposed.In addition,the corresponding algorithm based on a primal-dual framework is also proposed.Experimental results demonstrate that the proposed GI-TV mixed regularization algorithm has superior convergence and stability performance compared with the widely used l1-TV mixed regularization algorithm.展开更多
文摘This letter delnonstrates the structure of the passive radar using TV signals. Because the TV signal is a kind of pseudoperiodic signal, the matched filtering of color TV signals would yield high sidelobes which cause the range ambiguity. To overcome this problem, the mismatched filter is proposed to suppress the correlation sidelobcs of matched filtering of TV signals. By utilizing the iteration process, this method could achieve the required peak sidclobc level. The impacts of the noise and target movement on mismatched filtering are also analysed, Simulation results are included to demonstrate the effectiveness of the proposed technique.
文摘THERE＇S good news for football fans in Africa who have been sighing over the end of 2016 UEFA Eu- ropean Championship, Now they can switch to watch- ing Chinese Super League （CSL）, China＇s highest tier of professional football, which kicked off its 13th edition in March with the finale scheduled on November 5.
文摘数字电视前端信号异常,是影响数字电视用户观看效果和质量的重要故障因素。引起数字电视前端信号异常故障的原因是多方面的。对此,主要从混合光纤同轴电缆(Hybrid Fiber Coax,HFC)光电混合网故障、同步数字体系(Synchronous Digital Hierarchy,SDH)主干光纤环网系统问题以及马赛克现象三个方面,具体分析引起这些故障的原因,特别对HFC光电混合网故障和马赛克现象问题的几个不同故障类型进行详细的阐释,并分析故障的排查方法。结合一个故障案例处理过程,介绍数字电视前端信号异常故障的排查流程和解决措施。最后,针对数字电视前端信号异常故障,从前端设备选择及安装等方面提出日常防护措施。
基金supported in part by the National Natural Science Foundation of China under Grants No.62027803,No.61601096,No.61971111,No.61801089,and No.61701095in part by the Science and Technology Program under Grants No.8091C24,No.80904020405,No.2021JCJQJJ0949,and No.2022JCJQJJ0784in part by Industrial Technology Development Program under Grant No.2020110C041.
文摘A compressive near-field millimeter wave(MMW)imaging algorithm is proposed.From the compressed sensing(CS)theory,the compressive near-field MMW imaging process can be considered to reconstruct an image from the under-sampled sparse data.The Gini index(GI)has been founded that it is the only sparsity measure that has all sparsity attributes that are called Robin Hood,Scaling,Rising Tide,Cloning,Bill Gates,and Babies.By combining the total variation(TV)operator,the GI-TV mixed regularization introduced compressive near-field MMW imaging model is proposed.In addition,the corresponding algorithm based on a primal-dual framework is also proposed.Experimental results demonstrate that the proposed GI-TV mixed regularization algorithm has superior convergence and stability performance compared with the widely used l1-TV mixed regularization algorithm.
