基于广义解析法的动基座粗对准

动基座条件下捷联惯导系统由于动态环境的影响,采用传统的解析法进行粗对准会出现较大误差,针对这一问题,通过捷联惯导比力方程变形和引入辅助速度信息,提出了一种基于广义解析法动基座粗对准方法。进行了动基座条件下的仿真,在粗对准时间不大于200s的情况下,方位角对准精度达到了0.357°,水平角对准精度0.006°,满足进一步采用线性滤波方法进行精对准的要求。该方法算法简单,计算量小,精度高,具有一定的工程应用价值。     

里程计辅助的 SINS 行进间对准方法

为实现车载捷联惯导系统在行驶条件下的初始对准,提高车载武器系统的机动能力,提出一种里程计辅 助的捷联惯导系统行进间自主式对准方法。通过推导载体坐标系下的速度积分方程,利用姿态矩阵的链式法则,将 惯导初始对准转化为初始姿态的最优确定问题,进而采用 QUEST 算法求取初始姿态矩阵,并给出了算法的离散化递 推模型,实现了导航前一刻的行进间自主对准。仿真结果表明：该算法在无需任何先验姿态信息的条件下,能实现 捷联惯导系统的行进间快速高精度对准。     

捷联惯导系统传递对准中的时间补偿算法

为了减小或消除时间延迟的影响,提高系统动基座传递对准精度,提出了一种捷联惯导系统传递对准过程中对主、子惯导间信息传输时间延迟的补偿算法。该算法利用子惯导导航解算过程中的相关数据和延迟时间,对传递信息中因时间延迟产生的误差进行补偿修正,并用修正后的主惯导信息进行动基座传递对准。车载试验结果证明,该方法可有效提高系统传递对准精度,减小传递对准时间,补偿算法有效可行。     

自主式车载捷联惯导行进间对准方案设计

车载武器系统行进间初始对准的性能对提高武器系统生存能力有着重要意义。对已有的几种车载捷联惯导行进间对准方法进行论述,并对其适用性进行分析。在此基础上,设计了一种自主式车载捷联惯导行进间对准方案。将里程计航位推算得到的位置信息和利用电子地图进行地形匹配得到的位置信息分别作为观测量,经过分散式信息融合方法,使车载捷联惯导系统能够满足复杂车况下行进间对准快速、精确的要求。     

高精度激光捷联惯导行进中方位对准技术

为适应现代战争的需要,特别是现代战争的快速反应,惯导系统需要在很短的时间内完成粗对准后,在行进过程依靠简单的外部信息完成精确的寻北工作,这样能够显著提高系统的灵活性和机动性.介绍了高精度捷联惯导采用速度匹配对准方案实现行进中高精度方位对准,不需要对载体提出特别机动要求,在10m in内完成方位对准,方位对准精度优于3.3′secL.试验证明,该行进中对准方案能够实现高精度的水平及方位对准,具有良好的实际工程应用效果,达到了理论对准精度水平.     

惯导系统在动基座上的对准研究

动基座上惯导系统初始对准,系统信噪比弱,干扰信号强度较大,有用量测信号强度小,对准过程收敛慢。为提高惯导系统在动基座上的对准精度及对准快速性,设计了基于位置信息观测及递推滤波参数估计的对准方案,通过开路粗对准及舒拉调谐闭路估计精对准,实现游移方位惯导系统在动基座上的平台调平、航向确定及陀螺漂移测定,车载试验结果表明,所设计的方案,达到了较好的效果。     

游移方位激光捷联惯导系统传递对准方法

为解决舰船行进过程中的动基座传递对准问题,介绍游移方位激光捷联惯导系统传递对准的2种方法。以舰载激光捷联惯导系统作为主惯导系统,飞机激光捷联惯导系统作为子惯导系统,并通过卡尔曼滤波器进行仿真,分析了这2种不同的方法。仿真结果表明,2种方法均能满足传递对准精度的要求以及实际工程上的应用。结果表明该方法具有一定的工程应用价值。     

舰载导弹捷联惯导动基座方位对准技术研究

给出了采用角速度匹配的动基座对准原理及数学模型,针对舰载导弹捷联惯导系统直接进行方位对准的难题,提出了采用局部基准的间接方位对准技术途径,摇摆试验和舰载试验表明采用该技术显著提高了方位对准精度和快速性。     

采用速度匹配的动基座初始对准试验研究

对采用速度匹配方式进行动基座初始对准的原理及用 GPS 接收机提供的高精度水平速度分量辅助捷联惯导完成调平和方位对准的车载试验进行了分析、研究;给出了有代表性的仿真及试验数据、曲线。     

捷联惯导舰载动基座方位对准技术

本文给出了采用角速度匹配的动基座对准原理及数学模型，针对舰载导弹捷联惯导系统直接进行方位对准遇到的问题，提出了采用局部基准的间接方位对准技术途径，摇摆试验和舰载试验表明采用该技术提高了方位对准精度和快速性。     

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.     

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.