英语翻译To appreciate the significance of the proposed spatial CSbasedmethod in the array signal processing framework,itcan be compared to the conventional methods of the fielddirectionality estimation.According to the conventional methods,the be

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英语翻译To appreciate the significance of the proposed spatial CSbasedmethod in the array signal processing framework,itcan be compared to the conventional methods of the fielddirectionality estimation.According to the conventional methods,the be

英语翻译To appreciate the significance of the proposed spatial CSbasedmethod in the array signal processing framework,itcan be compared to the conventional methods of the fielddirectionality estimation.According to the conventional methods,the be
英语翻译
To appreciate the significance of the proposed spatial CSbased
method in the array signal processing framework,it
can be compared to the conventional methods of the field
directionality estimation.According to the conventional methods,
the beamforming was typically utilized for the noise
filed directionality estimation,and 2-D azimuth sector was
scanned via generation of consecutive directional beams.As
a result,the azimuth resolution was a strong function of the
beamwidth and the array length.According to the proposed
CS-based method,outputs of each array element (rows in
the sensing matrix Φ) provide measurements for the spatially
compressive sensing reconstruction process.Therefore,the
number of available measurements is proportional to the array
length M.According to the compressive sensing theory,the
number of measurements that is required to reconstruct the
J-compressible signal is
M ≈ c2J/(logN)4 ,(15)
where N is the maximal number of distinguishable in the
bearing space signals.The expression in (15) means that for
the given array length M and the field directionality sparsity
J,the maximal number of the array responses to distinct
plane waves is N,which determines the angular resolution
of the estimated field directionality.The exponential relation
in (15) provided the potential for significant improvement in
the angular resolution.
V.SIMULATION RESULTS
The performance of the proposed spatial CS-based field
directionality estimation approach is evaluated in this section.
Consider a ULA with M = 30 elements,and inter-element
spacing d = λ/2.In the first considered scenario,five strong
far-field point sources received at the following bearing angles:
θ = [33o,60o,76o,90o,120o] with signal-to-noise ratios
(SNR):[20,10,15,20,15] dB,were simulated.In [12],the
WS was proposed and it was shown that this method outperforms
other field estimation methods.In this scenario,field
directionality estimation performance of the CS-based method
was compared to the WS.For the WS,a field directionality
was obtained from four array orientations 70o,80o,90o,100o.
Fig.1 shows an estimated field directionality for the CS and
the WS-based methods.This figure shows that the CS-based
estimator outperforms the WS estimator.

英语翻译To appreciate the significance of the proposed spatial CSbasedmethod in the array signal processing framework,itcan be compared to the conventional methods of the fielddirectionality estimation.According to the conventional methods,the be
为领会提出的基于空间CS的方法在阵列信号处理框架内的意义,可将其与常规的场方向性估计方法进行比较.根据常规方法,波束形成典型来说被应用于噪声场的方向性估计,而2维方位矢量则通过发生连续的定向波束来扫描.因此,方位分辨率是波束宽度和阵列长度的强函数.根据提出的基于CS的方法,每个阵列元件(传感矩阵Φ中的行)的输出都提供用于空间压缩传感重构过程的测量值.因此,可获得的测量值的数目与阵列长度M成正比.根据压缩传感理论,为重构J-可压缩信号所需的测量值的数目为
式中N为象限空间信号中可分辩的最大数目.式(15)的表达式意味着,对于给定的阵列长度M和场方向性稀疏度J,对不同平面波的阵列响应的最大数目是N,这决定了被估计场方向性的角度分辨率.式(15)中的指数关系为角度分辨率的明显改善提供了可能.
5 仿真结果
所提出的基于空间CS的场方向性估计方法的性能在本小节做了评价.考虑一个带有M=30个元件的,元件间间隔d=λ/2的ULA.在第一个考虑的情况中,仿真了在以下象限角:θ=[33°、60°、76°、90°、120°],以以下信噪比:[20、10、15、20、15]dB接收的5个强远场点源.在文献[12]中,WS被提出,并已证明,此方法胜过其他场估计方法.在本情况下,基于CS的场方向性估计方法与WS法做了比较.对于WS法来说,场的方向性由4个阵列取向70°、80°、90°、100°获得.图1示出了基于CS的方法和基于MS的方法所估计的场方向性.此图证明了基于CS的估计量要由于WS的估计量.

为理解假定的CS为基础的意义
方法在空间阵列信号处理的框架内,
可以相比该领域的传统方法进行
方向性的估计。按照传统方法,
波束赋形是典型的利用的噪音
提出的方向性估计,同样地,2 - D方位部门
通过连续扫描定向顾及。
因此,方位分辨率是一个功能强大
波束和数组的长度。根据
压缩传感理论,每个数组元素的产出(...

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为理解假定的CS为基础的意义
方法在空间阵列信号处理的框架内,
可以相比该领域的传统方法进行
方向性的估计。按照传统方法,
波束赋形是典型的利用的噪音
提出的方向性估计,同样地,2 - D方位部门
通过连续扫描定向顾及。
因此,方位分辨率是一个功能强大
波束和数组的长度。根据
压缩传感理论,每个数组元素的产出(在行
传感矩阵Φ)为空间测量
压缩传感提供了重建进程。因此,
可用测量数量与M长度成正比阵列
根据压缩传感理论
测量数字,需要重建
可压缩信号
M≈c2J /(logN)的4,(15)
其中N是在轴承空间(的信号)中可区分的的最大数量 。
(15)的表达,就是要为
给定数组的M长度和外地的方向性稀疏度
J的数组的最大数量的反应。不同
平面波是N,它决定了角分辨率
估计方面的方向性。该指数的关系
在(15)提供了潜在的改善
的角分辨率的显示。
五,模拟结果
本节将对以CS为基础的现场
方向性估计方法进行评估。
考虑到ULA 及M = 30元素的线阵,元素
间的空间d=λ/ 2。在第一次审议中,五个强
远场点来源在以下轴承角度被接受:
θ= [33o,60度,76o,90度,120o]信号的信噪比
(信噪比):[20,10,15,20,15]分贝,被模拟。在[12]中,
WS被提出来,结果表明,该方法优于
其他领域的估算方法。在这种情况下,异地
方向性的CS为基础的理论与WS为基础的理论
是相近的。对于WS,有一个外地方向性
获得4个阵列方向70o, 80o, 90o, 100o。
图表 1显示了一个CS和WS为基础的方法的估计领域的方向性 。
这个数字表明,CS为基础的估计量胜过WS为基础的估计量。

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