基于神经网络的超精密车床圆柱度误差补偿技术研究

根据所研制的超精密亚微米车床的具体特点，提出了一种基于神经网络的工件圆柱度误差补偿方法，并据此建立了误差补偿控制系统，实验结果证明所提方法简单易行，在超精密车削中应用前景广阔。     

铝合金精密机箱整体铸造计算机模拟

介绍利用计算机模拟方法进行精密铸造整体机箱工艺设计的结果。     

Optimal Cooperative Sensing using a Team of UAVs

The authors investigates the joint optimal estimation of both the position and velocity of a ground moving target (GMT) using pulse Doppler radars on-board unmanned aerial vehicles (UAVs). The problem of cooperative estimation using a UAV team and the optimization of the team's configuration to achieve optimal GMT position and velocity estimates are addressed. Based on the Cramer-Rao bound, the minimum achievable error variance of the GMT position and velocity estimates is derived. The expression of the minimum achievable estimation error variance for unbiased estimation provided by the Cramer-Rao bound is minimized yielding the optimal configuration of the UAV team. Our solution is complete in that it addresses various GMT tracking scenarios and an arbitrary number of UAVs. Optimal sensor geometries for typical applications are illustrated     

500MHz超高速智能计数／定标器

在原子核科学其它许多高技术应用中，对脉冲信号进行计数和定标是一种最基本和应用最为广泛的数据获取方法。随着科学技术的发展，对计数／定标器（Ｃｏｕｎｔｅｒ／Ｔｉｍｅｒ）计数分辨力和仪器的智能化提出了越来越高的要求。目前，在国内核物理及其它科学技术领域所应用的计数／定标器的计数分辨力都不高，通常在１００～２００ＭＨｚ范围。本文报导我们最新研制的一种结构简单、性能优良的、计数率为５００ＭＨｚ的超高速计数／定标器，重点将介绍它的设计原理、研制技术和初步应用结果。     

Dimension reduction for array processing with robust interference cancellation

We present a robust solution for data reduction in array processing. The purpose is to reduce the computation and improve the performance of applied signal processing algorithms by mapping the data into a lower dimension beamspace (BS) through a transformation. Nulls steering to interference are incorporated into a transformation using the subspace projection technique, and the BS spatial spectrum estimation accuracy is evaluated and maximized with a measure. The derived transformation tries to preserve the full-dimension Cramer-Rao bounds (CRBs) for the parameters of interest while rejecting undesired signals effectively. When compared with an optimal method and an adaptive approach, simulation results show that significant improvements are obtained in terms of BS direction-of-arrival (DOA) estimation root-mean-squared error (RMSE), bias, and resolution probability.     

Ultra-wideband technology and random signal radar: an ideal combination

Ultra-wideband radar and random signal radar are two types of newly-developed radar systems. This paper introduces the special advantages of the combination of ultra-wideband technology and random signal radar to the international radar community. It shows that these two radar systems have a very close relationship in nature and can gain significant benefits from each other. It can be anticipated that the random signal modulated waveform will open many potential possibilities for the applications of ultra-wideband radar systems to civilian operating environments.     

Eclipse插件开发技术浅探

Eclipse平台是一个开放源码的、可扩展的、基于Java的集成开发环境(IDE).Eclipse本身不提供强大的用户功能,其全部功能都是利用其插件(Plug-in)机制来实现的.本文基于Eclipse平台的体系结构,重点分析了在Eclipse平台下进行插件开发的原理,并实现一个简单插件来展示eclipse插件开发的全过程.     

测液体粘滞系数的一种方法

本文介绍了一种测液体粘滞系数的方法－“落球法”，该方法装置简单，原理清楚，有利于拓宽学生的视野，培养和提高学生的实际技能和处理数据的能力。     

一种新的切换超平面设计法

本文在文献［１］、［４］的基础之上针对线性系统提出了一种切换超平面的鲁棒设计法。该方法考虑了系统参数的变化，具有强的鲁棒性。设计实例给出了将该方法用于某型海防导弹高度控制回路的仿真结果，其结果是相当令人满意的。     

Data fusion of multiradar system by using genetic algorithm

Detection system with distributed sensors and data fusion. are increasingly being used by surveillance systems. There has been a great deal of theoretical study on decentralized detection networks composed of identical or non-identical sensors. To solve the resulting nonlinear system, exhaustive search and some crude approximations are adopted. However, those methods often cause either the system to be insensitive to some parameters or the suboptimal results. In this paper, a novel flexible genetic algorithm is investigated to obtain the optimal results on constant false alarm rate data fusion. Using this approach, all system parameters are directly coded in decimal chromosomes and they can be optimized simultaneously. The simulation results show that adopting the proposed approach, one can achieve better performances than the reported methods and results