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。     

捷联惯导系统动基座初始对准研究

建立了捷联惯导系统动基座对准的误差模型,利用分段定常系统可观测性分析理论和方法对系统动基座初始对准时的可观测性进行了全面分析.并采用卡尔曼滤波技术,对系统在各种运动基座初始对准情况下的平台误差角进行了估计,给出了方差仿真曲线,比较了静基座与在这些运动情况下的卡尔曼滤波器的估计效果.仿真结果表明,在捷联惯导系统动基座初始对准过程中,可以通过载体线运动和角运动的改变来提高系统的可观测性和状态变量的可观测度,从而提高估计的精度和速度.     

一种里程计辅助车载捷联惯导行进间对准方法

提出一种车载捷联惯导行进间对准方法。以里程计信息为辅助,将行进间对准过程分为粗对准和精对准,以惯性坐标系作为捷联惯导解算的参考基准并借助里程计信息进行粗对准,采用10状态Kalman滤波器进行精对准,观测量采用捷联惯导解算的速度与里程计解算得到的速度之差。进行仿真试验和实车试验,试验结果表明：该方法实现了行进间初始对准,兼容静基座及晃动基座初始对准,对行车路线及行进方式不做要求,捷联惯导在25 min内实现了和静基座对准相同的精度,对准精度与对准的时间正相关,对准时间越长对准精度越高。     

强跟踪滤波在捷联惯导动基座初始对准中的应用

捷联惯导系统动基座初始对准的研究中是假定运载体做恒定运动,而实际中运载体会改变运动状态．一些参数随之发生突变．使用卡尔曼滤波会造成跟踪误差增大。针对该问题,提出并设计了应用强跟踪滤波技术的捷联惯导系统动基座初始对准方案。通过数字仿真,将卡尔曼滤波与强跟踪滤波的性能进行比较,证明该方法具有精度高、抗干扰、跟踪能力强的特点。     

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。     

动基座惯导系统快速初始对准方案

由于动基座的非匀速运动,给惯导系统平台的调平带来了附加误差.通过分析动基座在水平方向的运动加速度,推出了惯导系统平台调平等效误差角模型,并给出了一种快速初始对准方案.     

惯导系统动基座对准技术评述

惯导系统动基座对准是武器系统的一项关键技术,技术含量高、难度大,已成为各国研究的热点课题之一.概述了动基座对准的基本原理,国内外发展历程和概况,最后阐述了工程实际中仍需研究的几个问题.     

惯导系统动基座对准技术评述

惯导系统动基座对准是武器系统的一项关键技术，技术含量高、难度大，已成为各国研究的热点课题之一。概述了动基座对准的基本原理，国内外发展历程和慨况，最后阐述了工程实际中仍需研究的几个问题。     

捷联惯导系统动基座对准中的可观测性分析与研究

建立了捷联惯导系统动基座对准的误差模型，利用分段定常系统可观测性分析理论和方法对系统动基座初始对准时的可观测性进行了全面分析，定性地得出了载体不同运动对系统可观测性的影响结果。分析结果表明，在动基座对准过程中，无论载体是线运动还是角运动，在一定条件下都能够提高系统的可观测性，进而提高卡尔曼滤波器的估计速度和精度。并采用卡尔曼滤波方法，对平台误差角进行了估计，给出了仿真曲线，验证了分析结论。这为研究捷联惯导系统的快速精确对准方法奠定了理论基础。     

不同机动方式对机载武器系统传递对准性能影响研究

建立了“速度＋姿态角”匹配下传递对准滤波器模型。详细研究了不同机动方式对机载武器捷联惯导系统传递对准性能的影响，并对计算机仿真结果进行了深入的分析。该研究成果为实现机载武器动基座快速精确初始对准技术在工程中的应用提供了理论依据。     

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.     

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.     

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。     

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.