捷联惯导系统级余度技术研究

为了防止捷联惯导系统由于长时间工作而导航精度变差，对导航系统之间的互补性进行了研究，介绍了SINS／GPS与SINS／DNS两套综合导航系统方面的内容．通过对系统误差、性能的分析及仿真，给出了组合导航子系统的故障检测与隔离算法．该结果表明，采用组合惯导余度技术在工程实践上确实可以解决捷联惯导系统长时间工作而导航精度变差的问题．     

GPS/SINS/CNS 组合导航在航天器上的应用

针对传统的惯性导航误差模型推导不适合空间应用以及GPS信号传输修正能力有限等问题,提出一种基于GPS/SINS/CNS的组合导航系统总体设计方案。在导航仿真系统中增加组合导航系统性能评估模块,推导了基于J2000坐标系的惯性导航误差模型,给出GPS、SINS与CNS的数学模型,利用扩展的卡尔曼滤波设计组合导航系统,对连续信号和信号中断两种模式进行了仿真。仿真结果表明,该导航系统能很好地满足航天器在轨运行的导航性能要求,能够为航天器提供高精度的测量与导航信息。     

空空导弹SINS/GPS紧组合导航系统仿真

为了满足空空导弹远程发射要求,采用基于伪距、伪距率的SINS/GPS组合导航系统作为空空导弹的中制导。建立了惯性器件和GPS的误差模型,设计了Kalman组合滤波器,用MATLAB软件对紧组合系统进行了仿真研究。仿真结果表明,紧组合导航系统导航精度满足空空导弹中制导设计要求。     

SINS/GPS紧密组合导航系统仿真研究

对紧密组合的SINS/GPS复合导航系统在高速、高机动弹道导弹上的可行性进行了分析研究。建立了紧密组合模式的SINS/GPS全系统的仿真模型,给出了GPS仿真器中导航星的位置计算、最佳导航星座选择及输出伪距的实现算法;选用伪距、伪距率为观测信息,分别采用输出和反馈校正两种模式,实现了基于伪距、伪距率的SINS/GPS紧密组合导航系统仿真。仿真验证表明,与松散组合模式相比,紧密组合导航系统收敛性好、导航精度高,能够很好地抑制弹道导弹在高机动飞行状态条件下惯导系统误差积累的现象,有较好的导航性能。     

SINS/TACAN/ADS/OES机载组合导航设计与仿真

设计了以中等精度捷联惯导系统（SINS）为主导航系统,大气数据系统（ADS）、塔康系统（TACAN）和机载光电瞄准系统（OES）三种导航系统作为辅助导航系统的机载组合导航系统。SINS／TACAN／ADS／OES机载组合导航系统由两部分构成：（1）采用联邦滤波器的SINS／TACAN／ADS组合部分;（2）机载光电瞄准系统对导航位置误差校正部分。以一条典型的飞行轨迹对所设计的SINS／TACAN／ADS／OES组合导航系统进行了全航线的仿真研究,仿真结果表明：SINS／TACAN／ADS／OES组合导航方案是可行的,可以利用现有的机载辅助导航系统来降低对惯性器件的精度要求,基本满足飞机导航系统的性能要求。     

SINS/低成本基地辅助测速组合导航技术研究

借鉴INS/GPS组合导航系统原理,文中提出了SINS/速度组合导航系统方案.在此方案中,利用基地辅助测速测得的速度信息作为导航系统的辅助信息,通过Kalman滤波来修正SINS系统的误差.仿真结 果表明组合系统导航精度基本达到目前实际应用的水平.应用此方案,只须利用能够提供速度信息的低成本基地辅助测速系统(空基如高空气球等空中平台,陆基如雷达站等)就能实现导航定位的功能,具有实际应用前景和深远意义.     

差分GPS/SINS超紧组合在线标定与误差补偿方案设计

为了进一步提高GPS/SINS超紧组合系统的导航和误差标定精度,设计了一种基于载波相位差分的GPS/SINS超紧组合导航系统方案。一方面,超紧组合通过SINS对GPS跟踪环路的辅助,可以降低载波环路噪声带宽,减小码相关间隔,提高载波环和码环的跟踪精度;另一方面,载波相位提供高精度量测信息作为组合导航观测量,能够准确标定和补偿IMU常值误差,进一步提高了组合系统的导航精度。     

远程AUV组合导航技术研究

AUV通常采用SINS/DVL组合导航系统导航,然而在大航程时存在很大的定位误差.针对远程AUV的大航程及在水下状态自主航行存在的问题,提出定时引入GPS信息达到提高导航精度目的.文中重点介绍一种采用SINS/DVL/GPS水下组合导航方式,通过定时引入GPS信息,提出组合滤波器设计方案,仿真结果验证了此设计方案可有效提高系统导航定位精度.     

SINS辅助GPS检测技术在弹载组合导航中的应用

针对弹载SINS/GPS深组合导航系统提出一种动态检测GPS信号有效性的方法。推导了基于卡尔曼滤波理论和GPS伪距、伪距率量测的SINS/GPS深组合导航算法,通过分析滤波器残差统计特性设计了基于残差χ2检验的GPS信号故障检测算法和基于切比雪夫大数定理的GPS信号故障隔离算法。理论和仿真分析表明:利用SINS辅助GPS故障检测可进一步提高深组合导航系统的动态抗干扰能力,在GPS单颗或多颗卫星数据出现故障的条件下有效保障组合导航系统的导航精度。     

GPS失锁情况下基于神经网络的组合导航算法研究

文中针对GPS/SINS组合导航系统中GPS信号失锁问题进行研究,采用基于神经网络的组合导航算法.在GPS信号失锁时间段内,用神经网络模拟GPS的信息,进行信息融合.文中给出了基于神经网络的组合导航系统模型,并进行了数学仿真研究,结果表明,引入了神经网络的组合导航系统,在GPS信号失锁时,能保证一定的导航精度.本文为组合导航系统中GPS信号失锁问题的解决提供了一种方法.     

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.     

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.