A Void Reference Sensor-Multiple Signal Classification Algorithm for More Accurate Direction of Arrival Estimation of Low Altitude Target

There exists MUSIC （multiple signal classification） algorithm for direction of arrival （DOA） estimation. This paper is to present a different MUSIC algorithm for more accurate estimation of low altitude target. The possibility of better performance is analyzed using a void reference sensor （VRS） in MUSIC algorithm. The following two topics are discussed： 1） the time delay formula and VRS-MUSIC algorithm with VRS located on the minus of z-axes; 2） the DOA estimation results of VRS-MUSIC and MUSIC algorithms. The simulation results show VRS-MUSIC algorithm has three advantages compared with MUSIC： 1） When the signal to noise ratio （SNR） is more than - 5 dB, the direction estimation error is 1/2 as much as that obtained by MUSIC; 2） The side lobe is more lower and the stability is better; 3） The size of array that the algorithm requires is smaller.     

Algorithm for Multi-laser-target Tracking Based on Clustering Fusion

Multi-laser-target tracking is an important subject in the field of signal processing of laser warners. A clustering method is applied to the measurement of laser warner, and the space-time fusion for measurements in the same cluster is accomplished. Real-time tracking of multi-laser-target and real-time picking of multi-laser-signal are introduced using data fusion of the measurements. A prototype device of the algorithm is built up. The results of experiments show that the algorithm is very effective.     

ERP系统实施DEMO的制作与演示

对目前一些ERP系统提供商在为客户实施ERP系统时,对DEMO制作和演示的一些关键环节进行了探讨,为相关工作提供一些参考.     

基于IP技术的井下人员定位系统的设计与实现

提出了一种基于以太网技术的井下人员定位系统,并且以Visual C 作为开发工具,基于矢量制图的方式,设计了系统的图形组态模块,该模块包括图元的绘制、拖动、放大和缩小等具体属性。另外还描述了主要类的设计,充分运用了VC 语言的封装性、继承性和虚拟多态性。     

引导园林新潮的切尔西花园展

切尔西花展是英国最著名的花展，展示花园多由知名的园林设计家设计，其思想独特，风格各异，手法多样，反映了当今园林设计的前沿设计，对今后的园林发展起着重要的推动作用，庭院花园多由园林设计新秀设计，具有独创性，可为其他设计者提供借鉴作用，透视切尔西花展能为我国的园林发展提供有益的启示。     

集体式突围表演--当前中国建筑的一种现象

中国建筑界的实践状况就是一场正在进行着的“集体式突围表演”。截取了当代中国建筑现场的三次展览事件,探讨了突围从个体到集体,从自发、自觉走向表演的发展趋势。突围与表演在当前具有同样的现实意义,但表演因其非日常性与示范性将成为当代中国建筑的迷津。     

一种新的钻井中油气层快速检测技术——OSA和P—K矿场应用介绍

本文简单介绍了从EBH公司引进的快速油显示分析仪和孔隙度—渗透率分析仪的工作原理和流程。在分析了测试结果后认为,上述仪器具有快速提供大量地质信息的优点,所提供的信息可以满足钻探的需要,并且作者对该仪器的使用提出了进一步的改进意见。     

风冷热泵机组冬季运行的可靠性

分析了造成风冷热泵机组在长江流域地区冬季运行不可靠的原因,提出了对机组除霜控制技术和管路设计方面的改进意见,并就机组布置提出了新的看法。     

Radiation synthesis and characterization of polyacrylic acid hydrogels

The pH-sensitive polyacrylic acid （PAA） hydrogels were synthesized by gamma-ray irradiation at an ambient temperature. The influences of dose, monomer concentration, cross-linking agent content, pH, and ionic strength on the swelling ratio （SR） of the PAA hydrogels were investigated in detail. The results show that the SR of the hydrogel decreases with an increase in the dose, monomer concentration, and cross-linking agent content. In alkaline solution, the SR of the hydrogels is much higher than that in acid solution. Also, the ionic strength can influence the SR of the hydrogels. The more the concentration, the lower the SR.     

基于VC和Matlab的PID仿真软件实现

结合VC和Matlab各自的优点,采用混合编程技术实现了基于PID控制系统的仿真软件,通过对PID参数进行配置以达到对系统的调节,软件给出了系统性能指标并对系统输出曲线进行了动态显示。