为了在试验室环境下实现对高分辨距离像的回波模拟和成像验证,构建了多散射点和宽带LFM(Linear Frequency Modulation)回波信号模型,描述了回波模拟过程中关键的时域卷积和精确延时实现方法。根据被试设备不同的信号带宽形式,应用宽带...为了在试验室环境下实现对高分辨距离像的回波模拟和成像验证,构建了多散射点和宽带LFM(Linear Frequency Modulation)回波信号模型,描述了回波模拟过程中关键的时域卷积和精确延时实现方法。根据被试设备不同的信号带宽形式,应用宽带回波模拟器对相应的高分辨距离像回波进行了射频实现。通过与目标特性建模软件的数字仿真结果进行对比,验证了高分辨距离回波模拟的逼真度。以某飞机类扩展目标为研究对象进行了仿真验证,实现了优于0.1 m的距离分辨率。展开更多
Cluster analysis is a process to classify data in a specified data set. In this field,much attention is paid to high-efficiency clustering algorithms. In this paper, the features in thecurrent partition-based and hier...Cluster analysis is a process to classify data in a specified data set. In this field,much attention is paid to high-efficiency clustering algorithms. In this paper, the features in thecurrent partition-based and hierarchy-based algorithms are reviewed, and a new hierarchy-basedalgorithm PHC is proposed by combining advantages of both algorithms, which uses the cohesionand the closeness to amalgamate the clusters. Compared with similar algorithms, the performanceof PHC is improved, and the quality of clustering is guaranteed. And both the features were provedby the theoretic and experimental analyses in the paper.展开更多
文摘为了在试验室环境下实现对高分辨距离像的回波模拟和成像验证,构建了多散射点和宽带LFM(Linear Frequency Modulation)回波信号模型,描述了回波模拟过程中关键的时域卷积和精确延时实现方法。根据被试设备不同的信号带宽形式,应用宽带回波模拟器对相应的高分辨距离像回波进行了射频实现。通过与目标特性建模软件的数字仿真结果进行对比,验证了高分辨距离回波模拟的逼真度。以某飞机类扩展目标为研究对象进行了仿真验证,实现了优于0.1 m的距离分辨率。
文摘Cluster analysis is a process to classify data in a specified data set. In this field,much attention is paid to high-efficiency clustering algorithms. In this paper, the features in thecurrent partition-based and hierarchy-based algorithms are reviewed, and a new hierarchy-basedalgorithm PHC is proposed by combining advantages of both algorithms, which uses the cohesionand the closeness to amalgamate the clusters. Compared with similar algorithms, the performanceof PHC is improved, and the quality of clustering is guaranteed. And both the features were provedby the theoretic and experimental analyses in the paper.
