基于IMM-UKF的雷达/红外分布式加权融合算法

在雷达/红外复合制导机动目标跟踪背景下,针对非线性机动目标融合跟踪存在滤波器易发散问题,提出一种基于交互式多模型无迹卡尔曼滤波(IMM-UKF)的分布式加权融合算法。IMM具有对不同目标机动模式自适应跟踪的能力;UKF对观测数据进行滤波估计,避免了计算雅克比矩阵,克服EKF滤波方法受滤波初值影响大、易发散的缺点;分布式融合算法提高了系统抗干扰能力及对目标跟踪的有效性和跟踪精度。仿真结果表明:该算法在处理非线性系统机动目标跟踪融合结果误差均得到减少,更能提高目标跟踪滤波精度,增强了系统稳定性。     

固定指数加权模糊自适应EKF研究及其应用

为了改善扩展卡尔曼滤波（EKF）算法在机动目标跟踪中的跟踪性能,文中研究了一种固定指数加权模糊自适应扩展卡尔曼滤波技术,通过监视理论残差和实际残差的协方差一致程度。应用模糊推理系统不断调整滤波协方差,对扩展卡尔曼滤波器（EKF）进行在线自适应控制．最终实现最优估计。仿真结果表明,改进的算法稳定性高,精度得到明显改善．用于弱机动目标跟踪效果较好。     

基于消隐记忆SCKF的交互式多模型算法

针对交互式多模型算法(Interacting Multiple Model,IMM)在机动目标跟踪时,因模型不准确导致的滤波误差增大问题,提出了基于消隐记忆平方根容积卡尔曼滤波(Memory Attenuation Square Root Kalman Filter,MASCKF)的交互式多模型算法(IMM-MASCKF)。该算法在模型滤波中引入消隐记忆滤波理论,通过消隐记忆因子增大新息在滤波中的比重,改善了滤波器对目标机动的动态性能,提高了滤波精度。仿真结果表明,该算法可以实现对机动目标的有效跟踪,且与常规交互式多模型算法相比减小了滤波误差。     

方差模糊自适应卡尔曼滤波及其应用

卡尔曼滤波用于高机动目标跟踪随滤波时间的增大,滤波方差及增益对目标机动噪声的适应性差,滤波误差较大.文中研究了一种方差模糊自适应卡尔曼滤波技术,根据滤波新息幅值大小直接调解滤波方差,强化了滤波算法对目标机动噪声的适应能力.仿真结果表明,改进的算法稳定性高,精度得到明显改善,用于高机动目标跟踪拦截系统效果较好.     

基于交互式多模型的水下机动目标跟踪

为了解决水下机动目标跟踪的实时性和可靠性问题,在交互式多模型(IMM)的框架下对水下机动目标跟踪进行了分析,建立了目标运动方程和观测方程。交互式多模型滤波算法的选择直接影响到跟踪的精度,在跟踪滤波方面,针对交互式多模型滤波过程中观测方程非线性对滤波性能的影响,分别将扩展卡尔曼滤波(EKF)和无迹卡尔曼滤波(UKF)2种滤波算法与交互式多模型算法相结合。仿真结果表明,交互式多模型算法与UKF算法结合的滤波精度更高,能够更有效、可靠地达到跟踪机动目标的目的。     

基于长航时飞行器的SINS/GNSS自适应组合导航算法

当GNSS出现故障时,SINS/GNSS组合导航系统的输出误差就会增加,影响导航系统的性能.在此情况下,为了使组合导航系统的输出更加准确,文中论述了一种量测修正算法.该算法通过检查卡尔曼滤波残差,调整量测更新过程中观测量的权值,对状态量进行修正,减少了观测量异常对输出结果的影响.最后对量测修正算法以及简化的Sage-Husa自适应算法进行了仿真.仿真结果表明,两种方法得到的误差均优于标准卡尔曼滤波.     

基于模糊交互多模型的机动目标跟踪方法

文中提出了一种模糊IMM（FIMM）算法,通过模糊逻辑推理得到IMM算法模型集中各滤波模型的匹配度,即模型的概率,代替IMM算法中通过交互组合计算模型概率的方法,该方法不需要IMM算法中的模型先验概率及马尔可夫转移概率,从而降低了算法的复杂程度。仿真结果表明,和标准IMM算法对机动目标的跟踪效果相比,文中提出的模糊IMM算法具有更高的跟踪精度,更快的收敛速度。     

抗野值自适应卡尔曼滤波在频率标准上的应用

针对频率标准受器件老化、电磁干扰或机械振动冲击等影响导致其输出频率产生异常的问题,提出一种抗野值自适应卡尔曼滤波算法.该算法在传统卡尔曼滤波算法的基础上,增加抗野值因子对滤波方程的数据进行加权,根据平均频率误差的协方差变化自适应调整修正权值,增加当前测量值在滤波中的占有比重而不改变原有属性.仿真结果表明:该算法不仅具有...     

一种提高雷达导引头对机动目标跟踪性能的自适应滤波算法

为了提高地空拦截弹雷达导引头对机动目标状态估计的精度,在增加系统观测量的基础上,提出了一种针对机动目标跟踪的自适应滤波算法。利用量测残差统计值估计目标的机动状态,自适应的调整状态方程机动频率和加速度极限值;同时利用观测噪声统计估值器,调整观测值方差大小。仿真试验结果表明该算法具有良好的机动目标跟踪性能,并能自适应变化较大的观测噪声。     

一种快速跟踪机动目标的并行算法

针对机动目标的跟踪问题,采用一种完全解耦的卡尔曼滤波跟踪算法,即速度滤波器和加速度滤波器并行独立运算,加速度滤波器的输出用于校正速度滤波器的结果。根据探测到的目标机动性情况,加速度滤波器可实时切换。降低了滤波维数,从而使计算量和存贮量减少,提高实时性。仿真结果表明,该算法具有很好的跟踪性能。     

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.