1) spatial spectrum
空间谱
1.
the Application of Adaptive Channel Equalization in MUSIC Spatial Spectrum and Resolution Ability;
自适应通道均衡在MUSIC空间谱及分辨率中的应用
2.
The impacts of channel phase mismatch on spatial spectrum estimation algorithm;
通道相位失配对空间谱测向算法的影响
3.
The spatial spectrum technique based on MUSIC algorithm is mainly discussed as well as its application in the vehicle-carried direction-finding system of UAV.
介绍了一种基于MUSIC算法的空间谱估计技术,对其算法原理与过程进行了详细分析,并给出了它在车载无人机测向系统中的应用。
2) MUSIC spatial spectrum
MUSIC空间谱
1.
The expression of MUSIC spatial spectrum based on noise subspace was presented.
MUSIC空间谱估计突破了常规波束形成中的锐利限,能够对目标进行高精度方位估计。
2.
Higher precision direction of arrival(DOA) estimation can be obtained by iteratively searching the maximum of the MUSIC spatial spectrum using initial parameters obtained by array manifold estimation with a single vector hydrophone.
利用3个矢量水听器组成了三元矢量阵,对比了矢量阵自初始化MUSIC算法和MUSIC空间谱估计以及常规波束形成的性能。
3.
Experimental results show that the performance of DOA estimation using MUSIC spatial spectrum is improved comparing with that using conventional beamforming.
为了检验矢量阵MUSIC空间谱方位估计算法的性能,进行了三元矢量阵的外场试验,对比了MUSIC空间谱估计以及常规波束形成的性能。
4) spatial spectrum
空间频谱
1.
Influence of the observed-scene structure and noise on the precision of correlating Hartmann-Shack wavefront sensing is systematically analyzed,where the scene structure is described with spatial spectrum,and the signal-noise-ratio(SNR) is described with the ratio of the root-mean-square(RMS) of image grey variance to the root-mean-square of noise.
以空间频谱描述图像结构,以图像灰度起伏的方均根值与噪声方均根值之比表示信噪比,系统分析了目标图像结构和噪声对相关哈特曼-夏克波前传感精度的影响。
2.
Often Misunderstandings arise that the spatial spectrum of a linear physical system of finite size is discrete and the spatial spectrum of a linear physical system of infinite size is continuous, i.
常有这样一种错误概念:以为有限物理系统的空间频谱是离散的,而无限物理系统的空间频谱是连续的,即认为一个物理系统的离散或连续的空间频谱特征只取决于该系统的尺寸是有限或无限。
3.
Based on the wave equation,we have developed the theory on harmonic generation of phase aberrated laser with nonuniform intensity profile by applying the spatial spectrum analysis to deal with the nonlinear coupling.
从波动方程出发,应用空间频谱方法处理位相畸变光束的非线性耦合问题,建立了适用于位相畸变且空间光强不均匀光束的谐波转换的理论模型。
5) spatial frequency spectrum
空间频谱
1.
Imitated the optical system of Rowland circle structure, the Rowland sphere structure is built in this paper, the Rayleigh-Sommerfeld diffraction scalar integral formula of electromagnetic wave is simplified on the Rowland sphere structure, the computational formulas of spatial frequency spectrum and diffractional far field distribution from the weakly guiding optical fiber LP mode are derived.
仿照罗兰圆光学系统构造罗兰球光学系统 ,在罗兰球中简化电磁波的瑞利 索末菲标量衍射积分公式 ,推导出折射率阶跃分布的弱导光纤LP模衍射场分布和空间频谱的计算公式。
2.
The spatial frequency spectrum of intensity distribution on the focal plane is analyzed,which shows that the uniformity can be further improved by controlling the low frequency spatial modulations in the focal spot.
基于对均匀照明系统焦面输出光强分布的空间频谱分析,从空间频域的角度,指出通过控制焦斑中的低频调制成分,能够进一步提高实际均匀照明的效果。
3.
In this paper, the performance of the diffractive optical element (DOE) for beam smoothing is analyzed by using the spatial frequency spectrum.
采用空间频谱方法分析了衍射光学束匀滑器件的焦面光强分布 ,重新定义了光能利用率及顶部不均匀性两个参数 ,由于其定义的溯源性 ,能够真实准确地评价束匀滑器件的设计性能。
6) frequency spectrum
空间频谱
1.
The frequency spectrum and light intensity distribution of the dielectric planar waveguide diffracted field are educed,they are described by the sinc function.
在平面坐标系中简化电磁波的瑞利 -索末菲标量衍射积分公式 ,推导出折射率对称阶跃分布的介质平面波导的基模衍射场分布的计算公式 ,给出由sinc函数形式描述的端口衍射场空间频谱和光强分布。
2.
The frequency spectrums of dielectric and metal cladding waveguide are deduced.
从电磁波的瑞利-索末菲标量衍射积分公式出发,利用罗兰圆结构特殊的光学性能,在平面坐标系中简化标量衍射积分公式,推导出横截面折射率阶跃分布的平面波导端口衍射场分布的计算公式,并导出常用的对称结构介质平面波导和金属平面波导端口衍射场的空间频谱,阐明平面波导端口衍射场就是驻波衍射场的本质。
补充资料:空间谱带展宽
分子式:
CAS号:
性质:气相毛细管色谱中的一种现象,是引起色谱峰变形的主要原因之一。它所引起的色谱峰展宽程度与保留时间是成比例的,并导至峰的分裂,且重现性很差。在冷柱头进样中,引起空间谱带展宽主要有三方面原因:进样体积过大、样品的溶剂选择不当和洗提温度过高。只要采取相应措施如:进样体积少于2μl,选择的样品溶剂可以润湿固定相膜,柱温稍高于在载气进口压力下的溶剂沸点,则此现象是可以减免的。通常采取在入口处加一段没有涂层的保护柱来更好地消除此现象。
CAS号:
性质:气相毛细管色谱中的一种现象,是引起色谱峰变形的主要原因之一。它所引起的色谱峰展宽程度与保留时间是成比例的,并导至峰的分裂,且重现性很差。在冷柱头进样中,引起空间谱带展宽主要有三方面原因:进样体积过大、样品的溶剂选择不当和洗提温度过高。只要采取相应措施如:进样体积少于2μl,选择的样品溶剂可以润湿固定相膜,柱温稍高于在载气进口压力下的溶剂沸点,则此现象是可以减免的。通常采取在入口处加一段没有涂层的保护柱来更好地消除此现象。
说明:补充资料仅用于学习参考,请勿用于其它任何用途。
参考词条