自适应DBF与空间谱估计

讨论了自适应数字波束形成(DBF)技术和超分辨空间谱估计技术,并提出了一种基于信号协方差矩阵特征分解的时-空二维信号高分辨谱估计算法。以上技术应用于相控阵雷达系统,可以精确获得多个运动目标的方位信息和多普勒信息。文章最后给出了计算机模拟结果。     

多传感器信息融合技术

多传感器信息融合是Ｃ＾３Ｉ系统和电子综合战系统中的关键技术，本文从信息融合分类出发，讨论了单传感器的信息融合决策理论和技术以及多传感器信息融合原理，提出了多传感器信息融合专家系统，着重讨论贝叶斯法用于二元检测的分布式多传感器信息融合的检测方式。     

Study of GNSS-measured ionospheric total electron content variations generated by powerful HF-heating

The purpose of this work is to report the experimental evidences for the influence of perturbations in the electron density in the dayside mid-latitude ionosphere, that are caused by high-frequency heating of the F2 layer, on the GNSS signals. The experiments were carried out at the Sura heater (Radio Physical Research Institute, N. Novgorod). During the sessions of ionospheric heating with different time modulations of the radiated power the rays linking the navigational satellites with the ground receiver intersected the heated region. Variations in the total electron content (TEC) were studied; these variations are proportional to the reduced phases of navigational signals. It is shown that with the square-wave modulation of the radiated power (with periods of 1, 6, 10 and 15 min), perturbations with periods of the main modulation of heating and its harmonics appear in the spectrum of TEC variations. Examples are presented of identification of the heating-induced variations in TEC, including determination of the amplitudes and time characteristics of these variations.     

浅议信息时代高校校报的发展

在以网络为代表的新媒体无孔不入的今天,传统的报纸面临着巨大的压力,同样新媒体对高校校报的冲击无疑也是巨大的。如何在竞争激烈的新媒体时代继续引领校园舆论,是所有高校校报人所引以深思的问题。列举了信息时代以网络为核心的新媒体对高校校报的冲击,特别是在读者获取信息的方式、读者阅读兴趣、读者阅读习惯等方面的巨大影响;分析了高校校报和网络媒体在内容、形式等方面各自的长处和特点,并初步提出了高校校报机构调整和加深内涵建设等应对措施。     

基于T-S模糊模型的模糊大系统的混合滤波

针对非线性大系统内部过程参数的检测估计,采用连续模糊大系统模型,利用lyapunov定理和分布式处理方法,给出了模糊大系统的H2/H∞混合滤波器设计方法。该方法在保证滤波误差系统全局稳定的同时,具备了H2/H∞性能。通过求解线性矩阵不等式,可以得到滤波器参数。最后,用一个数值例子验证了该方法的正确性和有效性。     

棘爪扁簧断裂故障分析及制造工艺的改进

通过设计计算、对比分析、工艺复装、工艺试验等方法对棘爪扁簧使用中断裂故障进行了分析,并针对性地从设计、工艺两方面进行了改进,经鉴定与试车验证,措施有效,为航空发动机同类零件的研究提供了经验。     

基于STM32的视频流图像更新方法的研究

对基于STM32系统低速(工作主频72MHz)视频流处理显示更新方案的研究。结合图像处理基本理论,分析传统的显示方法的不足,并提出一种新的视频流图像更新的方法,通过一定的实验数据和理论结果,验证该方法可行性。     

A shortcut to marking 3D target curves on curved surface via a galvanometric laser scanner

Marking arbitrary three-dimensional(3D) target curves on given objects with curved surface is required in many industrial fields, such as fabric prepreg placement in composite material part fabrication, product assembly, surface painting for decoration, etc. A shortcut to the solution of this intractable problem is proposed by utilizing a galvanometric laser scanner(GLS) with the aid of a camera. Without using the existing tedious GLS calibration procedures,the proposed method directly establishes a mapping between the 3D coordinates of the laser spots on the object surface and the control voltages of the scanner. A single-hidden layer feedforward neural network(SLFN) is employed to model the mapping. By projecting a dense grid of laser spots on the object to be marked and simultaneously taking only one image, the SLFN model is trained in minutes via a linear solving mechanism. Experiments demonstrate that the trained SLFN model has a good generalization performance for marking 3D target curves. The 3D laser marking errors on experimental objects are less than 0.5 mm. The proposed method is especially suitable for on-site use and can be conveniently extended to multiple GLSs for marking large complex objects.     

气动钣金快速成形机的研制

针对电动钣金成形机制造成本高、效率低、易产生死点的问题,提出一种采用气液增力装置代替液压传动系统的气动钣金成形机设计方案。气液增力装置采用精密气压转换阀控制,实现行程平稳控制和加工成形过程平稳加载,显著提高了生产效率;配套研制的多种无齿收缩成形模具,可加工不同形状钣金件并获得更好的表面质量。该技术在钣金快速成形方面的研究处于国内领先水平,已获得3项国家专利。