多输入多输出(MIMO,Multiple-Input Multiple-Output)雷达用多个发射天线同时发射多个独立信号照射目标,并使用多个接收天线接收目标回波信号.本文研究了MIMO雷达中参数估计的稳健性问题.本文应用幅度相位估计(APES,Amplitude and Phase...多输入多输出(MIMO,Multiple-Input Multiple-Output)雷达用多个发射天线同时发射多个独立信号照射目标,并使用多个接收天线接收目标回波信号.本文研究了MIMO雷达中参数估计的稳健性问题.本文应用幅度相位估计(APES,Amplitude and Phase EStimation)技术,利用目标的方位角最大似然估计值,得到了衰落向量的APES估计算法.考虑到方位角估计的不准确性,借鉴稳健的Capon波束形成器的设计思想,本文推导了衰落向量的稳健的APES估计算法.仿真实验表明,衰落向量的APES算法与稳健的APES算法性能十分接近.因此,衰落向量的APES估计算法是稳健的.展开更多
Space-time adaptive processing（STAP） has been proven to be one of the best techniques capable of detecting weak moving targets in strong clutter environment and has been widely applied in airborne ground moving targ...Space-time adaptive processing（STAP） has been proven to be one of the best techniques capable of detecting weak moving targets in strong clutter environment and has been widely applied in airborne ground moving target indication（GMTI） radar.This paper applies an amplitude and phase estimation（APES） approach to two aspects of the STAP algorithm.Firstly,APES is applied to accurately describe the clutter characteristic in angle-Doppler domain.Then,APES is incorporated into the standard STAP algorithm to improve its performance without increasing transmitting/receiving channel and pulse number.The experimental examples show that the detection performance can be improved by using the APES technique,as well as the high computational complexity can be avoided.展开更多
In the science fiction novel titled The Planet of the Apes （1963）, Pierre Boulle tells a story about a completely reversed world where the apes dominate the humans. Coming from the normal world that is ours, a small...In the science fiction novel titled The Planet of the Apes （1963）, Pierre Boulle tells a story about a completely reversed world where the apes dominate the humans. Coming from the normal world that is ours, a small group of people is totally embarrassed and confused by observing this strange world. On the planet of the apes that they have discovered, it is the apes that are more intelligent than the humans. On the earth, it was the other way around. That observation results in their perplexity. The two communities, human and simian, bear with one another the relationship that corresponds to what Lotman calls ＂enantiomorphic pairings＂. In this context, a series of questions deserves to be raised： Is a ＂common language＂ possible between the two communities in the enantiomorphic pairings？ If the answer is yes, under what conditions could they succeed in opening up a space where they can have something in common？ In rereading The Planet of the Apes with reference to Lotman＇s semiotics of culture, we would like to formulate a response to those questions. Our claim is that the experience of finitude of one＇s own language can make possible an access to the new form of universality requisite for the cross-cultural communication： commonality without common points.展开更多
基于RSSI(Received Signal Strength Indication)位置指纹的Wi-Fi室内定位现已被大量应用于各类基于位置信息的服务中。但指纹定位的精度受到RSSI信号的剧烈波动影响,难以满足高精度位置信息服务的需求。为克服该困难,提出一种结合虚拟A...基于RSSI(Received Signal Strength Indication)位置指纹的Wi-Fi室内定位现已被大量应用于各类基于位置信息的服务中。但指纹定位的精度受到RSSI信号的剧烈波动影响,难以满足高精度位置信息服务的需求。为克服该困难,提出一种结合虚拟AP技术与高精度CNN(Convolutional Neural Network)判别模型的定位方法。该方法通过距离比定位得到虚拟AP的位置,并将该信息与RSSI融合作为数据增强CNN模型的输入,确定样本的位置。设计实验方案采集实际的用户终端RSSI数据,构建指纹定位的数据集,验证所提出的指纹定位方案的有效性。实验结果表明,在该数据集上,所提出的方法在确定区域时的准确度达到91%,并将95%的定位误差控制在2 m以内。对比现有的定位方案,所提出的方案在定位精度上有显著提升。展开更多
针对金刚石滚轮是一种回转体零件以及其加工制造过程中信息化集成程度低等特点,对金刚石滚轮的特征信息提取、特征加工方案决策、数控程序后置处理等关键技术进行了研究,采用了产品模型数据交换标准STEP AP 242,实现对金刚石滚轮的制造...针对金刚石滚轮是一种回转体零件以及其加工制造过程中信息化集成程度低等特点,对金刚石滚轮的特征信息提取、特征加工方案决策、数控程序后置处理等关键技术进行了研究,采用了产品模型数据交换标准STEP AP 242,实现对金刚石滚轮的制造特征信息提取,使用STEP AP 242和PDM相结合的集成方式,将金刚石滚轮三维模型作为制造加工信息的载体,并选择SolidWorks作为CAD和CAM软件,以及选择Aras Innovator作为PDM平台,使用C#编程语言和数据库技术开发了金刚石滚轮CAD/CAPP/CAM/PDM集成系统,并进行了实例验证。展开更多
目的对3个遗传性痉挛性截瘫(hereditary spastic paraplegia,HSP)患者家系的临床表现及致病基因进行分析。方法对甘肃省妇幼保健院(甘肃省中心医院)收集的3个HSP患者家系进行基因分析。结果家系1中先证者为FA2H c.159_176delGGCGGGCCAGG...目的对3个遗传性痉挛性截瘫(hereditary spastic paraplegia,HSP)患者家系的临床表现及致病基因进行分析。方法对甘肃省妇幼保健院(甘肃省中心医院)收集的3个HSP患者家系进行基因分析。结果家系1中先证者为FA2H c.159_176delGGCGGGCCAGGACATCAG(p.Arg53_Ser59delinsSer)纯合变异导致的常染色体隐性痉挛性截瘫35型,家系2中的先证者为AP4B1 c.1399G>T(p.Glu467Ter)纯合变异导致的常染色体隐性痉挛性截瘫47型,家系3中先证者为SPG11 c.7023C>G(p.Tyr2341Ter)的纯合变异导致的常染色体隐性痉挛性截瘫11型。其中,AP4B1 c.1399G>T(p.Glu467Ter)位点为尚未报告的变异。根据美国医学遗传学与基因组学学会(American College of Medical Genetics and Genomics,ACMG)指南,该变异的致病性评级为致病性变异。结论本研究丰富了HSP致病基因AP4B1的变异谱,为提高临床对HSP患者的认识与诊断能力提供了基础性数据。展开更多
文摘多输入多输出(MIMO,Multiple-Input Multiple-Output)雷达用多个发射天线同时发射多个独立信号照射目标,并使用多个接收天线接收目标回波信号.本文研究了MIMO雷达中参数估计的稳健性问题.本文应用幅度相位估计(APES,Amplitude and Phase EStimation)技术,利用目标的方位角最大似然估计值,得到了衰落向量的APES估计算法.考虑到方位角估计的不准确性,借鉴稳健的Capon波束形成器的设计思想,本文推导了衰落向量的稳健的APES估计算法.仿真实验表明,衰落向量的APES算法与稳健的APES算法性能十分接近.因此,衰落向量的APES估计算法是稳健的.
文摘Space-time adaptive processing（STAP） has been proven to be one of the best techniques capable of detecting weak moving targets in strong clutter environment and has been widely applied in airborne ground moving target indication（GMTI） radar.This paper applies an amplitude and phase estimation（APES） approach to two aspects of the STAP algorithm.Firstly,APES is applied to accurately describe the clutter characteristic in angle-Doppler domain.Then,APES is incorporated into the standard STAP algorithm to improve its performance without increasing transmitting/receiving channel and pulse number.The experimental examples show that the detection performance can be improved by using the APES technique,as well as the high computational complexity can be avoided.
文摘In the science fiction novel titled The Planet of the Apes （1963）, Pierre Boulle tells a story about a completely reversed world where the apes dominate the humans. Coming from the normal world that is ours, a small group of people is totally embarrassed and confused by observing this strange world. On the planet of the apes that they have discovered, it is the apes that are more intelligent than the humans. On the earth, it was the other way around. That observation results in their perplexity. The two communities, human and simian, bear with one another the relationship that corresponds to what Lotman calls ＂enantiomorphic pairings＂. In this context, a series of questions deserves to be raised： Is a ＂common language＂ possible between the two communities in the enantiomorphic pairings？ If the answer is yes, under what conditions could they succeed in opening up a space where they can have something in common？ In rereading The Planet of the Apes with reference to Lotman＇s semiotics of culture, we would like to formulate a response to those questions. Our claim is that the experience of finitude of one＇s own language can make possible an access to the new form of universality requisite for the cross-cultural communication： commonality without common points.
文摘针对金刚石滚轮是一种回转体零件以及其加工制造过程中信息化集成程度低等特点,对金刚石滚轮的特征信息提取、特征加工方案决策、数控程序后置处理等关键技术进行了研究,采用了产品模型数据交换标准STEP AP 242,实现对金刚石滚轮的制造特征信息提取,使用STEP AP 242和PDM相结合的集成方式,将金刚石滚轮三维模型作为制造加工信息的载体,并选择SolidWorks作为CAD和CAM软件,以及选择Aras Innovator作为PDM平台,使用C#编程语言和数据库技术开发了金刚石滚轮CAD/CAPP/CAM/PDM集成系统,并进行了实例验证。
文摘目的对3个遗传性痉挛性截瘫(hereditary spastic paraplegia,HSP)患者家系的临床表现及致病基因进行分析。方法对甘肃省妇幼保健院(甘肃省中心医院)收集的3个HSP患者家系进行基因分析。结果家系1中先证者为FA2H c.159_176delGGCGGGCCAGGACATCAG(p.Arg53_Ser59delinsSer)纯合变异导致的常染色体隐性痉挛性截瘫35型,家系2中的先证者为AP4B1 c.1399G>T(p.Glu467Ter)纯合变异导致的常染色体隐性痉挛性截瘫47型,家系3中先证者为SPG11 c.7023C>G(p.Tyr2341Ter)的纯合变异导致的常染色体隐性痉挛性截瘫11型。其中,AP4B1 c.1399G>T(p.Glu467Ter)位点为尚未报告的变异。根据美国医学遗传学与基因组学学会(American College of Medical Genetics and Genomics,ACMG)指南,该变异的致病性评级为致病性变异。结论本研究丰富了HSP致病基因AP4B1的变异谱,为提高临床对HSP患者的认识与诊断能力提供了基础性数据。
