一种新的激光陀螺捷联惯导系统的误差参数标定方法

为了提高激光陀螺捷联惯性导航系统的导航精度，对惯性器件误差进行了原理上的分析和说明，并针对由国内某型激光陀螺构成的惯性测量器件进行了误差分析。在此基础上建立了精确的误差模型，并采用多位置标定法标定出了加速度计的误差系数，采用分立标定法标定出了陀螺的误差系数。     

基于AR模型的光纤陀螺建模方法研究

作为新一代的光学陀螺仪,光纤陀螺的性能决定着惯性参考系统的精度,为了提高光纤陀螺的精度,本文提出了利用时间序列分析法中的AR模型[1]对光纤陀螺零漂数据进行分析,采用最小二乘法对数据进行了处理和拟和,并在此基础上应用卡尔曼滤波算法对建模后光纤陀螺的漂移数据进行了滤波,有效地抑制了光纤陀螺中的随机误差,得到了陀螺信号的常项漂移趋势,提供了一种符合工程应用要求的光纤陀螺漂移模型。     

陀螺稳定平台的滑膜变结构控制实验研究

针对高精度陀螺稳定平台快速隔离扰动、稳定视轴的要求,设计了以挠性陀螺为惯性传感器的双轴陀螺稳定平台.介绍了该平台的结构,分析了影响平台稳定精度的因素,并针对速率陀螺反馈加传统PID控制不能实现稳定角度无静差的问题,尝试了一种滑膜变结构控制策略.试验结果表明,采用滑膜变结构控制方法后,陀螺稳定平台精度可提高50％以上.     

一种新的激光陀螺捷联惯导系统的误差参数标定方法

为了提高激光陀螺捷联惯性导航系统的导航精度,对惯性器件误差进行了原理上的分析和说明,并针对由国内某型激光陀螺构成的惯性测量器件进行了误差分析.在此基础上建立了精确的误差模型,并采用多位置标定法标定出了加速度计的误差系数,采用分立标定法标定出了陀螺的误差系数.     

多元回归分析法在光纤陀螺标定中的应用

全面系统地介绍了多元回归分析理论，给出了相应的计算公式，并将其成功应用在光纤陀螺标定中。以光纤陀螺标定为例，检验了拟合方程的正确性以及各个因素对量测的显著性，为提高惯性器件测量精度、组合导航精度打下基础。     

加速度计的动态特性对无陀螺微惯性测量组合性能影响的研究

本文以压阻式加速度计为例,探讨了其动态特性对无陀螺微惯性测量组合的影响.首先,建立了9个加速度计的无陀螺微惯性测量组合模型,并推导了该模型的导航方程,然后根据加速度计的动态特性改进了其导航方程,最后进行了仿真验证.从仿真结果可以看出,对于相同的加速度计,输入信号的动态特性越强,惯性组合的误差越大.因而选用动态特性好的加速度计有助于提高无陀螺微惯性测量组合的性能.本文为无陀螺微惯性测量组合走向实用化,提供了理论依据.     

半球谐振陀螺与光学陀螺的比较

近来在波音747飞机上成功的飞行试验证明,半球谐振陀螺可以与惯性级[0.01(°)/h]及环形激光陀螺相比拟。为了增加半球谐振陀螺产品的种类,Delco电子仪器公司正在开发两种小型半球谐振陀螺,这两种产品是专门为了低成本惯性测量装置和中成本惯性导航设备而设计的。介绍了小型半球谐振陀螺的惯性级和战术级传感器及其辅助电子线路的基本设计。为降低电子线路的成本并保持1ppm(10~(-6))的精度,重点介绍了数字控制和处理技术。由于低成本惯性测量装置的产品具有很强的竞争性,所以有必要将环形激光陀螺和光纤陀螺传感器与新型半球谐振陀螺传感器对照进行比较。     

捷联惯性测量单元配置方案及比较

在多加速度计测量运动体角运动信息原理的基础上,对无陀螺和单陀螺捷联惯性测量单元的配置方式进行了研究,给出了20多种配置方式;对几种典型配置方式进行了误差分析和比较,得出如下结论:①适当的9加速度计方案和单陀螺方案具有同一数量级精度;②载体转动角速度Ω=10 rad/s,加速度计安装点距载体质量中心距离ρ=20 cm,惯性测量单元连续工作30 s钟情况下,在无陀螺和单陀螺捷联方案中,要求加速度计综合精度约为1.2×10-6m/s2;最后,文章给出了一种新的测量高速三维转动体运动信息的6加速度计无陀螺方案。     

提高惯性仪表精度的途径

惯性仪表的精度是指惯性仪表允许误差的大小,允许误差小,就是精度高,允许误差大,就是精度低。本文主要介绍提高惯性仪表精度的重要性以及国外提高惯性仪表精度的主要途径。一、提高惯性仪表精度的重要性惯性仪表的精度对惯导系统的精度影响很大。单是陀螺的误差就占整个系统误差的16～     

基于惯性系下陀螺误差在线估计修正的惯性与星光组合导航方法

传统惯性与星光组合通常需要将惯性系下的星光姿态信息转换到导航坐标系进而与惯性导航系统进行姿态组合,由于姿态信息转换过程中通常需要引入地理位置信息实现转换,从而不可避免地引入转换误差,无法充分发挥高精度星光姿态信息对惯性导航误差的修正作用。考虑到陀螺原始输出信息和星光姿态信息均能直接在惯性参考坐标系下测量获得,设计了一种基于惯性系下陀螺误差在线估计修正的惯性与星光组合导航方案。通过建立基于惯性系下陀螺误差估计修正的惯性与星光组合导航数学模型,直接在惯性系下对陀螺漂移误差进行在线开环跟踪估计;通过对陀螺误差实时修正,能够有效减小由于陀螺漂移所带来的惯性导航系统解算误差。仿真结果表明,该方案能够有效估计出陀螺的漂移误差,进而有效提高了惯性导航系统精度。     

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.