Design of a Radar Signal Simulator Based on Virtex-Ⅱ Series FPGA

The si mulation of radar echo is a dynamic pro-cess,including generation,transmission and process-ing of the radar echo.Many techniques,such assemiconductor,computer and signal processing areusedin the process of si mulation.The si mulation ofradar echo is a combination of the digital si mulationtechnique and the radar technique.Its basic tech-niques include the computer and signal processingtechniques.Its object is to test the algorithmand thequality of theintegrated system,as well as to eval…     

Generalized ionospheric dispersion simulation method for wideband satellite-ground-link radio systems

A generalized ionospheric dispersion simulation method is presented to verify and test wideband satellite-ground-link radio systems for dispersion robustness. In the method, ionospheric dispersive effects on wideband radio waves are modeled as an allpass nonlinear phase system, thus greatly decreasing the need for signal priori information. To accurately simulate the ionospheric dispersion and reduce the implementation complexity, the system is decomposed into three new allpass subsystems: with a linear phase passing through zero frequency, a constant phase, and a nonlinear phase with zero-offset and quasi-parabolic form respectively. The three subsystems are implemented respectively by the combination of integer-interval delay and fractional delay filter, digital shifting phase and the complex-coefficient finite impulse response (FIR) filter. The ionospheric dispersion simulation can be achieved by cascading the three subsystems in a complex baseband and converting the frequency to a radio frequency. Simulation results show that the method has the ability to accurately simulate the ionospheric dispersion characteristics without knowing the signal priori information and has a low implementation complexity.     

基于核典型相关分析的多特征组合人脸识别

为了提高人脸的识别率,利用多特征和分类器之间的互补优势,提出一种基于核典型相关分析的多特征组合人脸识别方法（KCCA-MF）。提取人脸图像的LBP特征和Gabor特征,采用核典型相关分析算法对两种特征进行融合,以消除冗余特征,采用K近邻算法和支持向量机建立组合人脸分类器,并采用3个经典人脸库进行仿真分析。结果表明,相对于其他人脸识别方法,KCCA-MF提高了人脸识别的识别准确率和效率,可以满足人脸识别的实时性要求。     

关节型轮胎硫化抓取装置的动力仿真分析

论文针对轮胎硫化工序中装卸轮胎的工作需求,设计出一款关节型的轮胎硫化抓取装置。首先通过S型加减速速度控制算法对装置进行速度规划,求解出装置运转时末端的最大加速度,针对操作机的动力学逆问题运用ADAMS软件进行仿真分析,求解在给定末端点最大加速度运行情况下,各驱动器所必须提供给各主动关节的广义驱动力和关节的受力情况。结果表明,扭矩的变化曲线都较为平稳并未出现跳动以及频繁变向的情况,各关节受力大小合理并无突变和频繁变向的情况。为驱动器的设计提供了理论基础,验证了所设计的轮胎硫化抓取装置结构的可靠性和速度规划的合理性。     

超低压力启动止加阀

对现有止回阀的性能、结构进行了分析,设计了一种可以随意安装于各种方向的管道中的超低压力启动止回阀。     

消失模铸造法生产CA488发动机进气歧管

介绍了消失模法生产进气歧管的工艺过程、过程控制参数及主要设备。生产表明,采用ＥＰＣ法生产进气歧管,既提高了生产率又改善了铸件品质。     

珠江口盆地白云凹陷珠江组海底扇深水重力流沉积特征

珠江口盆地白云凹陷珠江组油气藏以其较大的规模、典型的海底扇结构、优越的储集性和巨大的油气勘探开发前景在国内外引起高度关注。 通过对白云凹陷 W 和 H 这 2 个气田珠江组各种原生沉积构造及古生物等相标志分析,确定了珠江组属于以深水重力流沉积为主的海底扇沉积体系;划分出内扇、中扇和外扇 3 个亚相,水道、水道间和前缘朵体等微相,颗粒流、碎屑流、近源浊流和远源浊流等重力流沉积类型;在对各类重力流沉积特征和分布规律进行详细分析的基础上,提出了集源、渠、汇三位一体的海底扇沉积模式。     

船舶密闭舱室油料气味检测与评估方法的研究进展

对船舶密闭舱室的油料气味问题的产生进行了论述,介绍并分析了船舶密闭舱室气体的采集方法和检测方法,并探讨了人体感官评价在油料气味研究中的特点与方法,为开展船舶舱室中油料气味的研究提供依据。