传感器网络中结合分类信息的多目标关联算法

多传感器多目标跟踪系统的关键技术之一是航迹关联,应用于传感器网络时更为复杂。提出结合分类信息的基于图模型航迹关联算法,把目标分类信息和运动学信息相结合来提高关联效果。它利用分类混淆矩阵确定分类结果似然函数,修改基于图模型的航迹关联算法的顶点兼容函数和连线兼容函数。对多传感器网络的多目标跟踪情况仿真．比较仿真结果说明结合分类信息确实提高了关联正确率。     

多目标定位水池实验研究

介绍了一种多目标定位方法——ESPRIT-CORR 方法,设计了一套多目标定位水池实验方案,进行了水池实验,经过数据处理和信号处理后,给出了多目标定位实验结果,并对结果作了分析。通过对2个和4个目标的多目标定位水池实验表明,本文的方法在真实水下环境中是有效的。     

一种基于灰关联的目标运动要素解算方法

针对线导鱼雷远距快攻的特点,探讨了一种纯方位条件下基于灰关联的快速获取目标运动要素的方法：将目标初距和速度进行合理划分,根据实测目标方位变化量计算舷角值,由此组合成不同的标准目标态势类,并通过仿真得到标准目标方位序列集。将实测目标方位序列作为参考序列,标准目标方位序列集作为比较序列进行灰关联分析,得出与实测目标方位序列关联度最大的标准目标态势类,将此标准类反演即可得出目标运动要素。大量的仿真试验证实,该方法能在相对短的时间内得出一定精度的目标运动要素,从而实现线导鱼雷的远距快攻。     

基于双圆锥阵的水下目标被动定位方法

针对目标航行深度未知的水下目标被动定位,提出了基于双圆锥阵列的水下被动定位方法,解决了常规超短基阵无法实现被动目标距离估计的问题。双圆锥阵列是通过上下两个七元圆锥阵组合实现,可完成水下未知航行深度目标的方位角、俯仰角和目标距离的被动估计。仿真证明了该方法的有效性和可行性。     

目标纯方位定位方法研究现状分析

纯方位定位方法因其测量实现较为简单,在低成本定位系统应用方面前景广阔。针对动态目标定位这一研究热点,从方位测量方法、动态目标运动模型、滤波估计算法方面对近年文献的研究现状进行了总结,并阐述了相关原理。方位测量方面,重点分析了光学测量和无线电测量;动态目标模型方面,在运动模型建模的基础上讨论了多模型算法;滤波估计算法方面,针对测量模型的非线性、噪声特性不准确、非高斯白噪声、测量值异常四个问题,阐述了目前的研究成果。最后探讨了纯方位定位的发展趋势。     

基于蒙特卡罗的无线传感器网络战场目标定位模型

针对目前我军使用GPS全球定位系统存在的不足,在对无线传感器网络进行分析的基础上,建立基于蒙特卡罗（Monte Carlo,MCL）的无线传感器网络定位算法模型。分别对MCL、质心和Amorphous 3种算法进行比较,并以蒙特卡罗定位算法为例,研究估计误差与网络参数及算法间的关系。结果表明,MCL算法误差最小。     

一种新的两站多目标无源定位与跟踪模型

为了改善两站无源定位与跟踪算法的性能,在研究了现有的无源定位与跟踪技术以及人的两只眼睛如何协同对目标定位和跟踪的基础上,设计了分辨信息生成与属性关联算法,结合方位数据关联算法和扩展卡尔曼滤波器,初步构建了相对完整的两站多目标无源定位与跟踪的智能仿生新模型,并对有效定位范围和误差分布进行了分析。初步的仿真试验证明该算法对目标数量和队形适应能力强,定位跟踪精度高,同时将计算量控制在较小的规模内。     

利用接收电视信号的多站系统进行目标定位以克服距离模糊

较短的不模糊距离是以电视信号为辐射源的双基地探测系统所面临的难题之一,本文深入研究了利用测量距离和的目标定位方法克服距离模糊的机理,提出了根据发射源的最大辐射距离,来确定最大不模糊可测椭球面的最优方法,指出了基线距离与最大不模糊可测空域的变化关系,对充分发挥辐射源的威力和选择最大不模糊可测空域提出了一条有效的途径.     

交叉定位中去除虚假目标的一种新算法

针对测向交叉定位系统数据关联中存在虚假定位的问题,提出一种改进的分层快速关联算法.该算法先通过挖掘各传感器的相互位置关系与其对同一目标所形成方位量测之间的几何规律,利用候选关联的方位量测构造检验统计量,进行方位粗关联,排除了大部分虚假候选关联,减小了运算量;再对剩余候选关联进行分层组合,提取出正确的关联集合.仿真结果表明,文中算法可快速、准确的排除虚假定位点.     

分布式多传感器多目标航迹关联处理算法研究

系统综述分布式多传感器多目标航迹处理的4种算法：序贯航迹关联算法、最近邻域航迹关联算法、K近邻域航迹关联算法,以及修正的K近邻域航迹关联算法。对这些理论方法用MatLab仿真进行理论分析实验,实验结果证明其具有可行性。     

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.     

Stability of the Third Generation Intensifier under Illumination

The stability under illumination of transmission-mode GaAs photocathode sealed in the third generation intensifier is investigated by use of spectral response testing instruments. The variations of spectral response with the illumination times under weak and intense illumination are compared. The variations of photoemission performance parameters are also characterized. The results show that during initial several weak illuminations photocathode behaves no evident decay and a maximum sensitivity is achieved, while under intense illumination the sensitivity of photocathode begin to decrease largely at the first illumination. The calculated performance parameters show that the variation of surface escape probability with illumination times is a direct cause of instability of photocathode. It is also found that under intense illumination peak wavelength is moved towards short-wave and peak response is decreased, which shows that the ability of long-wave response of photocathode is decreased.     

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.     

Passive Acoustic Radar for Detecting Supersonic Cruise Missile

A Passive Acoustic Radar is presented as a necessary complement to electromagnetic wave radar, which will be expected to be an effective means for detecting cruise missiles. Acoustic characteristics of supersonic flying projectiles with diverse shapes are expounded via experiment. It is pointed out that simulation experiment could be implemented using bullet or shell instead of cruise missile. Based on theoretical analysis and experiment, the ““acoustic fingerprint““ character of cruise missile is illustrated to identify it in a strong noise environment. After establishing a locating mathematical model, the technique of acoustic embattling is utilized to resolve a problem of confirming the time of early-warning, considering the fact that velocity of sound is much slower than that of light. Thereby, a whole system of passive acoustic radar for detecting supersonic cruise missile is formed.     

Super-resolution Restoration of Remote-sensing Images

A novel image restoration scheme, which is super-resolution image restoration algorithm Poisson-maximum-afterword-probability based on Markvo constraint （MPMAP） combined with evaluating image detail parameter D, has been proposed. The advantage of super-resolution algorithm MPMAP incorporated with parameter D lies in the fact that superresolution algorithm MPMAP model is discrete, which is in accordance with remote-sensing imaging model, and the algorithm MPMAP is proved applicable to linear and non-linear imaging models with a unique solution when noise is not severe. According to simulation experiments for practical images, super-resolution algorithm MPMAP can retain image details better than most of traditional restoration methods; at the same time, the proposed parameter D can help to identify real point spread function （PSF） value of degradation process. Processing result of practical remote-sensing images by MPMAP combined with parameter D are given, it illustrates that MPMAP restoration scheme combined PSF estimation has a better restoration result than that of Photoshop processing, based on the same original images. It is proved that the proposed scheme is helpful to offset the lack of resolution of the original remote-sensing images and has its extensive application foreground.     

Design and Analysis of Test Schemes of Static Postponing Time on Shrapnels Used to Riot Control

The test scheme of static postponing time given in our actual national military test standard on shrapnels used to control riot is a nine-point test scheme on the combined action of three kinds of temperatures and three kinds of pressures,the consumed ammunitions are more excessive. Statistic analysis and tentative checkout about a lot of test data are done,feasibility gists are put forward for optimizing of the test design scheme. The optimizing design and data analysis of test scheme of the item are done by managing uniformity design theory, two scientific and reasonable six-point test schemes are confirmed. The feasibility and reliability of the optimizing design schemes put forward above are proved ulteriorly by test validating. The gained schemes not only have good design uniformity and little ammunition wastage and meet the test demand, but also have better forecast ability for the result data of other points using the mathematic models from the actual test points.     

Design and Simulation of TF and TA Controller for Missile

A nonlinear terrain following(TF) and terrain avoidance(TA) controller is proposed for missile control systems. Based on classical TF algorithm (adaptive angle method), a new method for TF controller is proposed by using angle of attack. A method of obtaining terrain outline data from digital elevation map (DEM) for TF control is discussed in order to save store space. A TA algorithm is proposed by using bank-to-turn technique. The block control model, which is suitable for backstepping design, is given for nonlinear model of missile. Making full use of the characteristics of the system and combining block control principle and backstepping technique, a robust controller design method is proposed. Uncertainties in every sub-block are allowed, and can be canceled by using the idea of nonlinear damping. It is proved that the state tracking errors are converged to a neighborhood of the origin exponentially. Finally, nonlinear six-degree-of-freedom simulation results for the missile model are presented to demonstrate the effectiveness of the proposed control law.     

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.     

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.     

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.