基于磁强计/陀螺的卡尔曼滤波定姿算法

针对基于磁强计的组合导航研究中,须事先确定滚转角这一不足,提出了一种磁强计和MEMS陀螺组合确定姿态的四元数卡尔曼滤波算法。利用陀螺测量的姿态角速率,结合磁强计输出的地磁分量测量值,运用卡尔曼滤波算法对三个姿态角同时进行最优估计,而不需要先验假设。仿真误差分析表明:姿态角解算结果具有较小的误差,且不随时间积累。     

基于无陀螺捷联惯导系统的四元数算法

在捷联惯导系统中,针对以往解算姿态角精度不高、导航误差随时间积累较快、解算存在奇异、精度不高等问题,采用了一种四元数解算算法,该方法只需求解由四元数所表示的四个姿态运动微分方程。实验证明,该方法算法简单,易于操作,从一定程度上抑制了误差的积累。     

反跑道子弹药延时快速在线解算算法

为了降低布撒器弹载计算机子弹药延时解算程序实时解算时间,设计了一种基于BP神经网络方法的延时快速在线解算算法,利用Visual C++编制仿真程序,采用包含3个输入节点、8个输出节点和8个隐层节点的3层BP网络进行解算,并通过仿真计算进行了验证.仿真结果表明该方法计算结果误差小,精度满足指标要求.     

基于角增量提取改进算法的旋转矢量法

旋转矢量法应用于角速率陀螺时,将角速率转化为角增量产生了较大误差,为使旋转矢量法有效地应用于角速率陀螺的姿态解算,该文提供了一种改进的三子样旋转矢量法。该方法在经典三子样角增量提取算法上,增加了前后各1／3周期的节点,使得采样值更加有效利用。在不增加区问子样数的前提下,使每个有效节点至少被使用5次,大大降低了角速率向角增量转化的误差。仿真结果表明,该算法可以有效应用于角速率陀螺。     

基于基准角和补偿角的常规弹药滚转角磁探测算法研究

常规弹药发射过程中的高过载和飞行过程中的高速旋转使得陀螺仪等传统的姿态角测量系统无法正常工作,以地球磁场为测量基准,通过相关算法实时辨识弹丸的姿态角,具有一系列的优点.将弹丸的滚转角分解为基准角和补偿角,给出了处于射击平面内的弹丸滚转角解算方法并进行了误差分析.针对弹丸的摆动及地磁信号测量误差进行了仿真.仿真结果表明,该解算方法具有较高的精度,基本能够满足常规弹药简易制导滚对转角探测的需要.     

捷联惯导系统中补偿安装误差的优化算法研究

在无陀螺捷联惯导系统中。以高自旋弹丸运动姿态测试为研究背景，针对以往解算载体角速度精度不高。导航误差随时间积累较快的问题，提出一种新的十二加速度计配置方案。并在此方案下采用了一种提高角速度解算精度的优化算法，该方法运用阻尼高斯牛顿迭代法对加速度计的安装误差进行补偿修正。进行相应的仿真试验，并与理论值进行误差分析．证实了该方案的可行性和算法的有效性。     

基于地磁传感器的弹体姿态测量方法

针对现有求解弹体姿态角方法存在易受天气影响、不易分析解的存在性的不足,提出了一种基于地磁传感器的弹体姿态测量方法。该方法基于弹体坐标系及弹轴坐标系之间的转换关系求得弹轴坐标系上磁场强度,并通过迭代的方法解算出弹体姿态角,解决了常规利用磁传感器求解弹体姿态角难以分析解的存在性的问题。仿真结果表明,姿态角解算结果具有较小的误差,且不随时间积累,能实现对弹体的姿态测量。     

地磁信息的旋转弹姿态算法研究

针对小口径高转速旋转弹姿态测量问题,提出了一种利用纯地磁组合信息获取旋转弹姿态的算法。通过参考坐标系的关系构建姿态变换矩阵,建立姿态角的数学模型,并设计相应的纯地磁姿态算法,利用仿真软件得到三轴地磁信号来进行姿态解算。结果表明,本姿态算法可以实时解算较高长时精度的姿态角,可以为常规旋转弹药制导化提供姿态信息。     

基于地磁传感器测量的滚转弹药角速度估计

为了实时获得滚转弹药的飞行角速度,提出了一种基于地磁组件的角速度测量方法.该方法采用地磁传感器获得大地磁场强度在弹体三轴的投影及其变化率,并结合刚体转动运动模型,利用卡尔曼滤波器来获得滚转弹药的角速度.文中所提出的算法不同于其他的角速率估计器,不使用弹体的姿态,使得该算法适用于滚转弹药.仿真结果表明:该算法能很好的估计出滚转弹药的角速度,误差在允许的范围内,有较高的应用价值.     

基于目标轴线的成像引信测距算法

针对智能弹药对地面车辆的测距问题,提出了一种基于目标轴线的成像引信测距算法。将弹目相对姿态表示为测量坐标系和目标坐标系之间的相对位置角,利用目标轴线长度和夹角的透视投影关系完成弹目距离解算。算法采用弱透视透视投影模型简化了解算过程,利用相对位置角提高了解算精度。误差分析给出了弹目距离和相对位置角对测量误差的影响。对不同相对位置角和弹目距离下的图像仿真结果表明,测距相对误差小于3%,结果稳定。     

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.     

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.     

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.     

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。     

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.     

Design and Implementation of One Missile Visual Simulation System Based on OpenGL

The implementation of a missile＇s visual simulation system is explained that is developed with OpenGL（open graphic library） and the flight path and flight carriage in different stages of the missile are displayed. The establishment problems of the 3D scene are circumstantiated including the construction and redeployment of the model, creation of the virtual scene, setting of the multi-viewports and multi-windows etc. The missile＇s data driver, system flow, the modules and their mutual relations of the missile visual simulation system are discussed. The missile flight simulation results and effect of the scenes are given.     

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.     

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.     

Dynamic Encryption Technology in Ad-hoc Networks

A new dynamic encryption application in ad-hoc networks is proposed. The advantages of this method are its being able to use the previous ciphertext as a seed of a new encryption process, rendering the encryption process effective in all communication process by continuous dynamic key generation together with synchronization, and its capability to cut back on system bandages to a greater extent, which is valuable for the ad-hoc circumstance. In addition, the rationality and effectiveness of this novel encryption method have been verified by the test results.     

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.