查询词典 systematic sampling

A detection method of double-threshold constant false alarm movement object on double-base synthetic aperture radar includes finalizing distance compression of various pulse-sampling, dividing orientation time to be multiple CPI, carrying out FFT in each CPI to enter orientation frequency domain, comparing data amplitude of frequency channel at external of clutter region with the first threshold and outputting point trace, making coagulation on point trace, making Hough transform in point trace domain and making decision of the second threshold.

本发明涉及一种用于双基地合成孔径雷达的双门限恒虚警运动目标检测方法，其特征在于：1对每个脉冲采样完成距离压缩；2把方位时间分割成多个相干处理间隔；3在每个CPI内做快速傅立叶变换进入方位频域；4把杂波区外的频率通道的数据幅度和第一门限比较做判决并输出点迹；5点迹凝聚；6在点迹域做Hough变换并做第二门限判决。

Studying the positive definitiveness of the covariance matrix from discrete data is important to design the sampling plan and provides the base for the data analysis.However, there have been few outcomes about the positive definitiveness of covariance matrix, most of which have been restricted to the Covariance-matrix of continuous sample.

研究离散型样本协方差矩阵的正定性有助于判断是否可以降低样本的维数，有利于优化抽样个数，为抽样调查的优化设计方案提供一定的理论基础；为基于特征根的多元统计分析提供理论指导。

This thesis contributes to geometry compression in the following aspects: Proposes a method of progressive spherical mesh parameterization based on local parameterization by directly projecting the deleted vertices to its neighborhood. Based on spherical mesh paramterization, an adaptive subdivision remeshing method by progressivly redistributing of sampling points is proposed, by this means, the main geometry information of the original mesh can be captured with only a small amount of samples, it can also be used in mesh simplification. By regarding attributes binded on mesh vertices as geometry signals and transferring them onto a uint sphere by means of spherical mesh parameterization, meshes with different attributes are compressed with spherical wavelet successfully with high compression rate. As a kind of lossy geometry compression technique, two mesh simplification algorthimes are also presented in this thesis.

归纳起来，本文的主要贡献有：提出了以直接投影局部参数化方法为基础的网格累进球面参数化方法；在网格球面参数化方法的基础之上，提出了一种基于累进优化布点方案的网格细分采样方法，该方法可以用很少的采样点就可以捕获到网格的主要特征，因此我们也将其用于后面的网格简化工作当中；通过将网格顶点上定义的各种属性看成几何信号，并以网格球面参数化为手段将几何信号迁移到单位球面上，从而成功地实现了用球面小波对各种几何信号的压缩；作为一种有损压缩方法，本文还提出了基于统一距离的网格简化算法和基于重采样的网格简化算法。

Firstly, we use Gaussian kernel function to replace the Dirac delta kernel function, and embed the re-sampling into filtering to eliminate the impoverishment problem of the standard particle filter.

2为了解决光线变化的情况下，以及发生旋转、平移和尺度变化等姿态变化的运动目标的鲁棒跟踪问题，提出了一种基于自适应观测模型的粒子滤波跟踪算法。

The effects of data sampling methods, its density and distribution on the accuracy of DEM are presented.

阐述了原始数据的采集方法及其密度、分布对 DEM 精度的影响。

The digital processing front aims to demodulate I/Q signal and transform sampling frequency.

在数位处理前端的部份是将取样出来的讯号做I/Q讯号的解调变和取样频率的转换。

This design uses the monolithic integrated circuit to control 8 groups signals the sampling as well as the read-write process, uses the monolithic integrated circuit stored datum, uses the monolithic integrated circuit AT89S52 readout, through application software, 8 group signal demonstrations on hypothesized , and uses the light emitter diode demonstration.

本设计采用单片机控制8路信号的采样以及读写过程，采用单片机存储数据，采用单片机AT89S52读出数据，通过应用软件，将8路信号显示在虚拟示波器上，并且用发光二极管显示。

This design uses the monolithic integrated circuit to control 8 groups signals the sampling as well as the read-write process, uses the monolithic integrated circuit stored datum, uses the monolithic integrated circuit AT89S52 readout, through application software, 8 group signal demonstrations on hypothesized oscilloscope, and uses the light emitter diode demonstration.

本设计采用单片机控制8路信号的采样以及读写过程，采用单片机存储数据，采用单片机AT89S52读出数据，通过应用软件，将8路信号显示在虚拟示波器上，并且用发光二极管显示。

After roller compaction,the wet density of RCC would be measured by sampling from the digged pit or by nuclear densimeter.

碾压后，挖坑取样或采用核子密度水分计选点测量碾压混凝土的湿密度。

2 Hole size: densitometer structure, used to restrict the optical throughput and size of the sampling area..

3.2光孔大小：密度计结构中，用来限制光的通过量和采样面积的大小。

Chinese traditional virtue is humility and wariness,the compliment and praise to the others should be declination

中国人的传统美德是谦虚谨慎，对别人的恭维和夸奖应是推辞。如

We bought this house on the never-never.

我们以分期付款的方式买下这座房子。