双轴旋转激光捷联惯导系统在线标定技术

激光捷联惯导系统中陀螺和加速度计误差是影响系统导航精度的关键因素,结合双轴旋转激光捷联惯导系统自身的结构特点,提出了一种以速度误差和位置误差作为量测信息的双轴旋转激光捷联惯导系统在线标定方法,该方法可以在静态及行进等不同状态下完成在线标定。车载试验结果表明,在外场没有试验室标定设备如标定平板、高精度转台的条件下,按文中设计的标定路径及标定方法,可以准确估计出激光陀螺和加速度计的各项误差参数。该标定方法对标定环境、标定设备要求较低,且方法原理简单、易于实现。     

基于高阶卡尔曼滤波的激光捷联惯导系统级标定方法

随着激光捷联惯导系统的不断发展,系统对于误差标定的精度要求也在不断提高。在现有系统级标定算法的基础上,全面考虑了惯性器件零偏、安装误差角、标度因数误差、加速度计二次项、内杆臂等误差,并在计算速度和位置误差观测量时考虑了外杆臂误差,提高了激光捷联惯导系统误差模型的准确性,并基于此设计了一种基于高阶卡尔曼滤波算法的系统级标定方法。通过实验验证表明,与分立式标定方法相比,所提出的系统级标定方法具有更高的标定精度,能够满足高精度激光捷联惯导系统的标定需求。     

基于系统标定理论的机械和光学惯导统一标定算法

针对传统标定算法依赖转台精度的缺点,文中从导航速度误差与惯性仪表误差参数的基本方程出发,深入分析了导航速度误差各方向分量与光学惯导误差参数的关系,给出了标定位置选取的原则;并在光学惯导系统标定的理论基础上,详细推导了导航速度误差与机械惯导陀螺零偏的关系,结合机械惯导输出模型,深入分析了过载系数的辨识方法,统一了机械和光学惯导的系统标定算法。仿真结果表明,该方法辨识精度高,降低了对转台的定位精度的要求,提高了标定设备的使用性。     

一种捷联惯导系统的陀螺在线标定方法

提出一种捷联惯导系统的陀螺零偏在线标定方法。在静止条件下采集惯导系统在两个近似水平位置输出的速度信息和方位信息,利用扩张状态观测器提取惯导系统速度误差的微分信息,通过算法估计陀螺零偏。仿真结果表明:该方法可行且标定精度能够满足捷联惯导的要求。实物验证表明:该方法实现简单,可有效估计陀螺零偏,提高惯导系统导航精度,为工程应用带来较大便利。     

利用导航信息标定捷联惯导系统误差系数的方法

提出了利用导航数据反推捷联惯导误差系数的一种新的标定方法。推导了标定模型，给出了陀螺和加速度计标度因数误差的标定位置，并对标定模型进行了详细的分析。     

双星导航与捷联惯导系统在快速载体组合制导中的应用研究

利用卫星导航信息修正惯导信息是一种常用的信息融合方法。以捷联惯导(SINS)为基础，结合双星定位系统的特点，为了满足高动态载体高精度定位的需求，对于所提供的导航信息要求提供对应的延迟时间。分别建立了SINS和双星系统的导航方程，分析了它们的误差组成与特性。以此为基础，把双星导航与惯导导航数据中的位置差数据建立成时变参数的时间二次多项式形式，根据它们采样周期不一致的特点，并且双星导航数据时间间隔存在一定随机性的问题，采用递推最小二乘法(RLS)对位置误差模型的参数进行估计，进而得到临近周期实时补偿的位置与速度误差函数，与SINS数据复合就得到了融合后的高精度数据。该方法不需要对于误差的先验知识有所了解。『方真结果说明了这种方法的有效性。     

捷联惯导系统陀螺安装误差的精确标定方法

给出了一种实用的高精度捷联惯导陀螺安装误差标定方法。该方法利用了加速度计测角原理.测试出转台台面与转轴的非正交角,在陀螺的安装误差计算中消除了非正交角引起的误差,实际测试结果表明,安装误差的标定精度高达角秒级。该方法已广泛应用于多个捷联惯导系统的标定。     

捷联惯导/天文组合导航

为了有效提高惯性导航精度，文中介绍了一种基于星敏感器的捷联惯导组合导航方法。首先分析了捷联惯导／星敏感器组合导航系统的工作原理。其次，对组合导航系统进行建模，分析系统误差，通过捷联惯导和星敏感器的输出构造量测值，建立系统的误差状态方程和量测方程。最后，利用间接卡尔曼滤波，估计出组合导航系统的误差状态量，进而修正捷联惯导系统的位置、速度和姿态角。最终，通过对仿真结果的分析证实了该方法的有效性。     

利用导航信息标定捷联惯导系统误差系数的方法

提出了利用导航数据反推捷联惯导误差系数的一种新的标定方法.推导了标定模型,给出了陀螺和加速度计标度因数误差的标定位置,并对标定模型进行了详细的分析.     

图像辅助导航系统中量测矩阵的确定

文中基于准三维模型对惯导系统误差校正的思想，利用摄像机成像系统和捷联惯导系统（SINS）相结合的方法．着重对量测矩阵进行推导。然后，采用离散卡尔曼滤波方法进行导航误差估计，并用估计出来的误差对惯导系统的输出进行修正．在一定程度上提高了导航精度，理论上大大降低了导航成本。     

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。     

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.     

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.