ID 原文 译文
48516 本文借助分数阶傅里叶变换完成距离压缩和方位压缩,分别在能量聚集性最佳的分数阶谱域提取散射点的距离像和横向像,获得良好的聚焦效果。 In this paper, by means of fractional Fourier transform to complete the distance and azimuth compression, compression respectively in energy aggregation optimal fractional extraction scattering spectrum domain point distance and horizontal like, get good focusing effect.
48517 最后,通过对GRECO软件模拟数据的处理,验证了本文方法的有效性。 Finally, through to the GRECO software simulation data processing, verify the validity of this method.
48518 提出了一种基于Worldview-Ⅱ多光谱遥感数据的纹理特征提取方法。 Is proposed based on a Worldview - Ⅱ multi-spectral remote sensing data of texture feature extraction method.
48519 该方法针对Worldview-Ⅱ的8个波段,通过主成分分析(principle component analysis,PCA)变换进行多光谱遥感数据压缩,针对压缩后的数据特点建立主成分灰度差频空间(gray level difference frequency space,GLDFS),并利用GLDFS对多光谱遥感数据进行纹理特征提取。 The method for Worldview - Ⅱ eight band, through the principal component analysis (principle component analysis, PCA) transform for multispectral remote sensing data compression, according to the characteristics of the compressed data to establish a principal component grayscale difference frequency space (gray level difference frequency space, GLDFS), and use the GLDFS texture characteristics of multi-spectral remote sensing data are extracted.
48520 实验结果表明,与传统的灰度共生矩阵(gray level co-occurrence matrix,GLCM)单波段纹理分析方法相比,该方法能够保持多光谱数据之间的协同关系,具有更高的分类精度和执行效率。 The experimental results show that with the traditional gray level co-occurrence matrix (gray level co occurrence matrix, GLCM) than single band texture analysis method, this method can keep the cooperative relationship between multispectral data, has higher classification accuracy and the execution efficiency.
48521 提出了一种具有最优误码率性能的变换域通信系统基函数门限设计方法。 Put forward a kind of transform domain communication system with the optimal bit error rate performance basis function threshold design method.
48522 首先分析干扰存在条件下变换域通信系统调制及解调信号的组成,推导出系统误码率与基函数门限的关系式, First analysis of the interference exists under the condition of transform domain communication system of modulation and demodulation signal, the relation between the system bit error rate is deduced and the basis function threshold,
48523 然后以误码率最小化为准则,采用遍历搜索门限的办法对系统的最优误码率进行求解,从而得到基函数的最佳门限。 and then to ber minimizing criterion, using traversal search threshold method to solve the optimal system ber, the best threshold basis function is obtained.
48524 仿真结果表明,采用该方法得到的系统误码率是全局最优的,且适用于各种干扰条件的基函数门限设计,具有较低的计算复杂度。 The simulation results show that the system bit error rate is achieved by the method of global optimal, and suitable for all kinds of interference conditions the basis function of threshold design, has lower computational complexity.
48525 挠曲变形是影响传递对准精度的重要因素之一,在对准过程中载体的机动会引起挠曲变形模型较大的参数误差和系统模型噪声统计特性的不确定性,现有基于单一模型的滤波方法在解决这类问题时存在局限性。 Flexure deformation is one of the important factors that affect the transfer alignment accuracy, carrier of motor in the process of alignment error will cause large deflection model parameters and noise statistical characteristics of the system model uncertainty, based on a single model of filtering methods have limitations in dealing with this kind of problem.