惯性导航系统动基座对准对舰舰导弹捕捉概率的影响

采用惯性导航系统的舰舰导弹作为海战场最重要的攻击武器,能否快速准确地在舰艇上对导弹捷联惯性导航系统进行初始对准,是影响舰舰导弹捕捉概率的重要因素。动基座对准误差导弹捷联惯性导航系统作为的初始误差,会随着工作时间增长不断累加,导致末制导雷达开机时导弹散布误差和航向误差角不断增大,将致使末制导雷达的捕捉概率下降。基于动基座初始对准误差对导弹飞行控制误差的影响,以目标位置误差圆分布为基础,建立舰舰导弹捕捉概率计算模型,通过不同条件的参数设置,仿真计算出某型舰舰导弹动基座初始对准误差对目标捕捉概率的影响。结果表明捕捉概率近似线性下降,下降值约为静基座对准时的4.2%~6.5%.     

惯性/星光制导误差分离的可观测度研究

基于捷联惯性测量组合和星敏感器的“惯性+星光”复合导航方式综合了两种导航方式的优点,可以实现组合导航的高动态和高精度。研究了惯性/星光组合制导捷联安装的系统误差模型及其可观测度分析方法,计算了在不同位置进行误差分离的系统状态可观测度,并通过数学仿真证明了该分析方法的有效性,可应用于惯性/星光制导方案在线分离惯性失准角和安装误差角的方案快速论证。     

具有抗雷达关机能力的空地反辐射导弹发射方式的研究

采用被动雷达寻的加捷联惯性制导复合制导方案做为反辐射导弹对抗雷达关机的措施,应用广义卡尔曼滤波法解决了惯导轴指向误差的修正问题。在此基础上研究了导弹的发射方式,并给出了仿真算例。     

一种捷联未制导系统的优化设计

研究了一种新型捷联未制导系统,含有一个捷联式导引头,一套捷联式惯性传感器,其中的三个速率陀螺和三个线加速度计是导航、制导、驾驶仪部分共享的测量元件.给出了在惯性坐标系中估计目标相对导弹运动状态的捷联未制导方案,导出了该类系统的结构及数学模型,提出了广义卡尔曼滤波器及最优制导律的设计计算方法,最后用数字仿真验证了该系统对付近距、大机动目标的可行性.     

双位置初始对准技术在车载捷联惯导系统中的应用研究

针对车载捷联惯导系统的特点, 采用双位置初始对准的技术方案实现其初始对准.重点介绍了双位置初始对准及陀螺测漂的基本原理, 进行了大量的实验研究, 并采用改良卡尔曼滤波算法进行实验数据的处理.实验结果表明, 双位置对准方案消除了陀螺常值漂移和加速度计零偏对对准精度的影响, 提高了对准精度, 并且在对准的同时标定出陀螺常值漂移和加速度计零偏, 在导航状态给以补偿, 有效地提高了导航定位精度.     

一种捷联未制导系统的优化设计

研究了一种新型捷联未制导系统,含有一个捷联式导引头,一套捷联式惯性传感器,其中的三个速率陀螺和三个线加速度计是导航、制导、驾驶仪部分共享的测量元件.给出了在惯性坐标系中估计目标相对导弹运动状态的捷联未制导方案,导出了该类系统的结构及数学模型,提出了广义卡尔曼滤波器及最优制导律的设计计算方法,最后用数字仿真验证了该系统对付近距、大机动目标的可行性.     

一种基于小波的导弹静基座初始粗对准方法

目前战术导弹广泛采用捷联惯导系统。该系统在导弹发射前要经过初始对准，由于陀螺和加速度表的噪声很大，影响初始对准的精度，为减小噪声影响，文中将小波消噪理论应用到导弹捷联惯性制导系统的初始自对准中。研究显示，小波分解滤波可以显著减小惯性器件的噪声，利用经过消噪的信号进行初始对准，滤波器的收敛速度加快，在相同对准时间内精度有明显提高。     

空空导弹惯导系统传递对准中飞机惯导系统参数的应用

讨论了空空导弹捷联惯导系统传递对准中主惯导系统导航参数的应用问题,讨论了在火控系统中建立惯性系的原理和计算方法,指出采用惯性基准系在窗帘导弹传递对准中的优缺点。     

最优两位置对准在SINS自对准中的应用

捷联惯性系统的初始对准一直是国内外的研究热点,本文利用一种新的解析粗对准方法和最优两位置对准进行惯导系统的自对准,不仅提高了系统的可观测性,而且提高了对准精度。     

近程地地导弹捷联式系统的显式制导方程

前言捷联式惯性制导系统就是不采用平台,直接把陀螺和加速度表安装在弹体上来敏感导弹的运动,用数字计算机来进行坐标转换,求出导弹相对惯性空间的速度和位置,从而实现制导和控制。捷联式系统具有成本低、寿命长、可靠性高的优点,已受到苏、美各国的普遍重视。由于新型敏感元件(挠性陀螺、激光陀螺、挠性加速度表等)和大、中规模集成电路的高速数字计算机的出现,使得捷联式系统得以在工程上应用。近几年来,在航空、航天活动中,捷联式系统正受到越来越多的重视。     

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.     

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.     

Robust Graded Sliding Mode Tracking Control for Low Speed Spinning Ballistic Missiles

The nonlinear dynamic model of spinning ballistic missiles is established during the first boosting phase of the missile. Based on the conventional backstepping sliding mode control and the assumption of a two time-scale separation of missile dynamics, a graded sliding mode controller is designed with two sub-sliding surfaces which have invariability to external disturbances and parameter perturbations, and a matrix which comprises three first order low pass filters is introduced to prevent ＂explosion of terms＂. Owing to the upper bounds of the uncertainties are difficult to obtain in advance, adaptive laws are introduced to estimate the values of the uncertainties in real-time. Eventually, the numerical simulation results given to show the proposed controller can ensure the steady flight of missiles.     

A Study on the Estimation of Aeroheating upon the Warhead Nose at Supersonic Speed

An expression for estimating the aeroheating on a warhead nose at different supersonic speeds is proposed by incorporating CFD （computational fluid dynamics） and the least-square method. Compared with the traditional estimation formula, the expression is more accurate, convenient and can be used in the optimized design of warheads. The error from the result obtained in the test of a ball cartridge flight is less than 3 %. It satisfies the engineering requirements.     

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.