一种改进的加权融合算法

加权融合算法由于实现起来特别容易,所以在实际工程上得到了广泛的应用。但其加权因子直接影响融合结果,导致算法性能很不稳定。通过对多传感器航迹估计融合算法的深入研究,提出了一种改进的自适应加权融合算法,解决了算法性能不稳定的问题。仿真结果表明,文中改进的算法性能优于其他加权融合法。     

基于模糊神经网络的CMA盲均衡算法

文中提出的新算法是基于模糊神经网络设计控制器改进恒模算法。首先从理论上分析了模糊神经网络控制器实现方式．并用它进行控制步长控制．形成一种基于模糊神经网络的CMA盲均衡算法．通过计算机仿真验证了改进算法的收敛性能，结果显示相对于CMA算法．新算法在性能上有一定的提高。     

一种超宽带无线电引信回波信号处理算法

针对UWB (uhra-wideband)无线电引信回波信号被高频噪声覆盖的问题,提出了一种基于误差反馈控制的变步长LMS(least mean square)自适应滤波算法.将现有两种算法中的常系数变为关于误差的函数提出了步长与误差之间的非线性模型,并运用MATLAB对新算法的性能进行了分析.仿真结果表明:新算法在收敛速度和稳态误差方面得到了很大的改善.新算法性能良好,对超宽带无线电引信回波信号处理得到了令人满意的效果,便于实际应用.     

两点式数据关联算法在多目标跟踪中的应用

针对联合概率数据关联算法在计算量上的组合爆炸问题,引入了一种新的基于线性规划的两点式数据关联算法。在分析新算法基本原理的前提下,将其性能与传统的联合概率数据关联算法进行了比较,从理论上证明了该算法是一种全新的关联算法j并将两点式数据关联算法应用到多目标跟踪中,通过仿真验证了新算法在数据关联精度及运行时间方面优于传统算法。     

非高斯噪声环境中基于梯度范数的自适应滤波算法

针对传统最小均方类算法在非高斯噪声中自适应滤波性能下降的问题,提出了一种基于梯度范数的变步长归一化最小平均P范数算法.算法将α稳定分布作为非高斯噪声分布模型,依靠梯度范数与均方权值偏差(MSD)的关系自适应调整步长,加快收敛速度的同时减小稳态误差,理论推导证明了算法的有效性.仿真结果表明,在非高斯噪声条件下,该算法具有更好的收敛性能和抗突变能力以及更小的稳定误差.     

惯性稳定平台的扰动观测器/不完全微分PID复合控制

为提高惯性稳定平台控制系统的稳态性能,提出了一种扰动观测器与不完全微分PID相结合的复合控制算法。利用扰动观测器将控制系统中存在的外部扰动观测出来并补偿到原系统中,在增强系统扰动抑制能力、提高鲁棒性的同时,提高系统稳定精度。仿真结果表明:扰动观测器/不完全微分PID复合控制算法可显著改善惯性稳定平台的稳态性能,对比于常规PID校正方法,复合控制方法不仅提高了系统的响应速度,而且显著提高系统的扰动抑制能力,提高稳定精度。     

基于奇异值分解的秩截短多站时差定位算法

在分布式多站时差定位系统的研究中,现有定位算法存在的定位模糊、无解、不稳定、运算量大等问题.为了解决这些问题,提出了一种基于奇异值分解的秩截短多站时差定位算法.仿真和实际应用都验证了新算法的有效性.新算法有效地利用了定位方程组系数矩阵的先验秩信息,不但提高了定位精度,而且还增加了可观测性.     

一种空时自适应处理的降维矩阵改进算法

针对现有空时自适应处理(STAP)难以同时兼顾数据采样与性能,提出了一种STAP的降维矩阵改进算法,并给出了这种矩阵的具体构成。该算法的降维矩阵选取结合了局域联合处理方法(JDL)在主波束周围选取辅助通道性能稳定和广义相邻多波束法(GMB)辅助通道对准主波束选取针对性强的特点。仿真实验表明了该算法相比JDL和GMB方法在性能有所提升的同时也兼顾降低了数据采样要求。     

基于新的加权互相关的图像匹配

为了提高红外图像和可见光图像匹配的鲁棒性,提出一种新的基于结构张量的加权互相关算法。传统的基于边缘的归一化互相关算法仅仅利用边缘点进行匹配,新算法不仅利用边缘点,而且将图像边缘点附近的结构信息嵌入到匹配算法中。实验结果表明,新算法在抗噪能力、匹配性能等方面均优于传统的归一化互相关算法。     

浅海多时频调制频移键控水声通信算法性能仿真

研究了一种采用多频码元进行固定时延编码的浅海多时频调制频移键控水声通信算法(MTFSK—Mutiple Time Frequency Shift Keying),并结合建立的浅海水声信道模型对算法进行了仿真研究。仿真结果表明:MTFSK算法性能稳定可靠,误码率小于10~(-4)。     

Nitrosation and Nitration of Tetraacetyldibenzylhexaazaisowurtzitane

Tetraacetyldibenzylhitane (TADBIW) was subjected to debenzylation by nitrosating with inorganic materials available commercially to synthesize tetraacetyldinitrosohexaazaisowurtzitane (TADNSIW). TADNSIW was purified, and its structure was determined by FTIR, 1H NMR, MS and element analysis. The debenzylation reaction of TADBIW gave quantitative benzaldehyde as a by-product. This indicates that the reaction produces an imine cation as an intermediate. Hexanitrohexaazaisowurtzitane (HNIW) was prepared from unpurified TADNSIW with the yield over 96.0 % and the purity more than 98.0 %. And the mechanism of the reaction from TADNSIW to HNIW is proposed to be oxidation of nitroso and nitration of acetyl on the molecule of TADNSIW, This reaction system involved is simple, and the reaction can complete within a short time and under mild conditions. The product can be easily to separate and the waste disposed readily.     

A Robust Algorithm for Watermarking 2D Vector Maps with Low Shape-Distortions

The technique of watermarking has been introduced into 2D vector maps for many potential applications such as protecting the copyright of important GIS （geographical information system） data and tracing the data source of military maps. In most previous works, although the validity of the map data could be preserved during the embedding procedure, the shape-distortions of the map elements are usually neglected which would tend to degrade the invisibility of the watermarking schemes. A shape-preserving algorithm for watermarking 2D vector maps is presented in this paper. A 1D distance sequence extracted from the original map is adopted as the cover data instead of 2D coordinates. A watermark bit is represented by changing the distributions of the cover data. The embedding procedure induces lower shape-distortions than in former works. Experimental results indicate better invisibility of the proposed scheme, as well as its robustness to certain attacks such as map simplification, interpolation, additive noise and most geometric transforms.     

Open Rule-setting System Applied to Conceptual Design of Engines

Open rule-setting method advanced in this paper concentrates on providing designers of engines with a convenient way to express their design innovations and develop the expected prototypes in the early CAD stage, and constitute effective models for the following analysis process of CAE and CAPP. The problems arisen in the process of conceptual design with the traditional experience-based development method are analyzed. Based on those analyses, open rule-setting method is presented and some associated technical problems are discussed. The functional framework of open rule-setting system was built as software engineering methods. The speciality of the engine product as a kind of complex product and the requirement of the engine product based on its structural particularity to rule-setting system are considered carefully. A demonstration is supplied to illustrate how the open rule-setting method enhances the efficiency and quality of the engine conceptual design.     

Research on Linux Network Device Driver

By analyzing the working principle of Linux network device driver, discussing the Linux network driver structure and its key technologies, the general network driver structure and its design methodologies in Linux system are summarized. Through modifying the network device driver of Linux device driver 3rd version snull, c and improving the COW technology, the Zero-Copy technology in Linux （kernel version 2.6.11 ） is implemented. In the end, the success test tells us that the thorough analysis of network device driver is the foundation of many applications, and it also provides a certain improvement to a lot of real applications, even to military application development.     

Method for Measuring Velocity of Warhead Fragments Based on Photoelectric Detection

For measuring velocity and impacting position of single fragment of warhead, a non-contact measuring method is proposed, in which a six-light-screen array, a position indicator, a multi-channel chronograph and a computer are used.The principle of measurement is described. The key device of the system is a light screen array sensor which consists of six light screens allocated with certain geometrical parameters. When the fragment flies through the light screen array, the time of passing through each of the screens is recorded by the multi-channel chronograph. According to the time data and the geometrical parameters of the array, the velocity vector and the location of the fragment can be calculated immediately. The presented method can be used to locate the fragment and to measure the real velocity on its flying direction. It can also be used to measure the velocity of a fragment swarm after the system is engineered further.     

数码电子雷管中影响点火头性能因素分析

阐述了数码电子雷管中,点火药剂细结晶三硝基间苯二酚铅（LTNR）的制备工艺;从点火药剂的种类、加入黏合剂的质量分数、桥丝直径、点火头的电阻值、防潮漆的蘸涂等方面对点火头性能的影响因素进行了探讨;通过震动试验、并联起爆试验、延期精度检测与考核,试验结果表明：一次性合成的细结晶LTNR是制造数码电子雷管点火头较为理想的点火药剂,按技术要求生产的点火头性能指标能够满足行业标准要求。     

Improvement and Experiment of the Reamer in Vibra Cutter Against Wave Edge of Titanium Sheet Alloy Parts

By analyzing the influencing factors of part quality making of sheet alloy of titanium by vibra cutter, the shape of upper reamer is set as cylinder and wedge-shaped form, and the lower reamer as plain and hemicycle form, and its main structural parameters are defined as well. Then it is validated further that such improved vibra cutter reamer can be used to process curve-edged parts of titanium alloy sheet. The experimental result shows that the titanium alloy sheet parts processed by above equipment have no sharpen angles for convex parts and evident crevasse of concave-edged part. In summary, such improvement can eliminate the free-waved edge and improve the manufacture quality of titanium alloy sheet parts greatly.     

Experimental Study on the Small Flyer Initiating Behavior of Fine-grained Explosives

The initiating behavior of fine-grained explosives by small flyer is studied. The diameter of small flyer in this device is 1 ram. The test results indicate that the granularity of explosives has great effect on its flyer initiating sensitivity.The flyer initiating sensitivity of the fine-grained explosives is higher and the critical initiating energy is lower than that of common explosives. For common explosive, the flyer initiating sensitivity increases as the density is reduced. But for the fine-grained explosive, the test results are exactly opposite.     

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.     

Influence of Installing Error on the Surface Shape Precision of the Axial Symmetry Aspheric Workpiece in Lapping

A method to calculate the surface shape error, which is caused by the installing error between the workpiece and the lapping tool in the process of form lapping, is proposed. The mathematical model which the installing translation error influences on the workpiece surface shape error is established. The changing rule of the error is simulated through the calculating example of the paraboloid workpiece. The results indicate that the surface shape error of the workpiece is increasing with the increase of the installing translation error, it is also increasing gradually along the center point of the curve surface to the edge, and the influence is severer to the curve surface with great curvature than that of the small curvature when the translation error is the same.