Target estimation using MIMO radar with multiple subcarriers

This paper analyzes the effect of waveform parameters on the joint target location and velocity estimation by a noncoherent multiple input multiple output (MIMO) radar transmitting multiple subcarriers signals. How the number of subcarriers influences the estimation accuracy is illustrated by considering the joint Cramer-Rao bound and the mean square error of the maximum likelihood estimate. The non-coherent MIMO radar ambiguity function with multiple subcarriers is developed and investigated by changing the number of subcarriers, the pulse width and the frequency spacing between adjacent subcarriers. The numerical results show that more subcarriers mean more accurate estimates, higher localization resolution, and larger pulse width results in a worse performance of target location estimation, while the frequency spacing affects target location estimation little.     

Speed-Sensorless Control Using Elman Neural Network

1. INTanDUCTIONControlling induction motor without sensor is available nowadays. In order to aclileve two-level closed lOops,i. e., digital current lOop and digital speed loop, it is necessary to sense.and digitize the motor phase currentand motor speed. Howver, the sensors involved have the followillg disadvantages. First, they aJre eXPensiveand make up a significan portion of the total cost. Second, they may result in electrical or mechaulcal fault.Based on speed estimation, it is pos…     

空气中低浓度铅对女工生殖机能影响的调查

目的：研究长期暴露在低铅环境下女工生殖机能是否受到影响。方法：单盲法问卷调查。结果：在空气铅浓度为0．035～0．048mg／m3作业环境中工作，接铅作业女工的月经先兆症状以及痛经、团经的发生率明显高于非铅作业女工（P＜0．05）。结论：空气中低浓度铅对女工生殖机能有一定影响。     

缠绕式提升机的支轮应力分析

本文首先对新型的缠绕式提升机的弹支卷筒结构进行了较为细致的分析，对其应力计算作了深入探讨，并推导出了适合于新型提升机的支轮的应力计算方法和公式，完善了卷筒强度的设计方法，进而对提升机主轴装置的计算机辅助设计提供了切实可靠的理论依据。     

论社会建构主义形成的理论根源

通过参考众多社会建构主义的相关资料,文章着重从社会建构主义形成的理论根源出发,阐述了社会建构主义形成过程中主要的理论背景,目的在于能够更清楚地了解社会建构主义产生的背景,从而更进一步地了解社会建构主义的相关理论.     

动态模糊集的函数生成集

给出了一种动态模糊集的函数生成集的概念，并讨论了它的性质。     

"两税合一"对苏州利用外资和经济发展的影响——基于苏州市FDI与GDP关系研究

介绍了苏州利用外资的现状,通过阐述苏州市1990-2006年的FDJ与GDP的格兰杰因果检验.分析了"两税合一"对利用外资和经济发展的影响,并提出了政策建议.     

武汉地区用电现场管理系统的应用

简述了武汉供电公司用电现场管理系统的安装及管理情况，详细地分析了其在远程抄表、电费管理及用电监测、线损管理等方面的应用，提出了下一步用电现场管理的目标及措施。     

Minimal symmetric submani folds in compact Riemannian symmetric spaces

A necessary and sufficient condition for a symmetric submanifold to be minimal in its ambient compact Riemannian symmetric space is given. By this condition a complete classification of nonminimal symmetric submanifolds in compact symmetric spaces is obtained.     

黑加仑色素的分离及组成初步鉴定

利用纸层析对黑加仑色素进行分离，并进行分析鉴定，初步推测黑加仑色素４个组分分别为矢车菊素－３－芸香糖苷（Ｃｙ－３－ｒｕｔ）、飞燕草素－３－芸香糖苷（Ｄｐ－３－ｒｕｔ）、矢车菊素－３－葡萄糖苷（Ｃｙ－３－ｇｌｕ）、飞燕草素－３－葡萄糖苷（Ｄｐ－３－ｇｌｕ）．