一种小型雷达数字信号处理系统研究

介绍了一种小型雷达的数字信号处理系统的研究工作。描述了该数字信号处理系统的功能、组成和工作原理，其中着重分析了系统硬件和软件的设计，最后给出数字信号处理系统在该雷达中应用的试验结果。结果表明，利用数字信号处理比传统的模拟信号处理具有优越性：便于运用先进的信号分析和检测算法，改善对目标信号截获信噪比，提高截获能力和跟踪精度，而且可以用软件程序实现复杂的抗干扰算法。采用数字化信号处理技术简化了硬件设计     

爆破式ARM 对典型雷达目标的毁伤效果研究

为分析爆破式反辐射导弹（anti-radiationmissile,ARM）对典型相控阵雷达目标的毁伤效果,对ARM爆破战斗部的引战配合进行研究。在分析空地反辐射导弹末段弹道特性及爆破式战斗部毁伤机理的基础上,建立了爆破式ARM对典型目标触发起爆和近炸起爆时的毁伤模型,并采用Monte-Carlo仿真方法确定了近炸起爆的最佳起爆高度及不同起爆方式的导弹单发毁伤概率。仿真结果表明：对于天线高度较高的目标适宜采用近炸起爆,对于天线高度较低的目标适宜采用触发起爆。     

基于DSP的碰炸优先无线电引信信号处理技术

从连续波多普勒引信对地面装甲目标的实测目标回波信号出发，应用MATLAB信号处理工具对其进行了时频综合分析，得出了在不同交会条件下的信号幅度频率变化特征，提出了一种无线电引信对目标碰炸优先作用的策略算法，以提高无线电近炸引信对目标的毁伤效能。在此基础上，设计了实用的数字信号处理器（DSP）系统电路来实现该策略，并探讨了软硬件设计中的关键问题。     

多普勒式近炸引信

本发明是关于炸弹等在到达离目标地所规定的高度时才起爆的飞行体(弹体)的多普勒式近炸引信。一般情况下,为了检测装有无线电近炸引信炮弹的高度,在接近大地等无限平面和设定的目标地时,弹体要产生多普勒电压E、如公式(1)     

高速衰减正弦信号的采样及曲线拟合方法

为了更加准确地对起爆脉冲电流进行测量,提出一种起爆脉冲电流衰减正弦信号的采样及曲线拟合方案。通过上位机软件对ISA总线读取暂存于FIFO中的采样数据,设计了基于高速ADC＋FIFO的数据采集模块,并对某武器系统输出的单次衰减正弦信号进行采样存储,根据采样结果进行曲线拟合。拟合结果表明：该方法可精确测量被测信号的幅度与周期,并绘制出信号波形。     

AGC电路在深弹主动声近炸引信接收机中的应用

为了使深弹主动声近炸引信接收机准确地检测出回波信号．提高接收机的灵敏度．设计了深弹主动声近炸引信自动增益控制（AGC）系统。通过对检波后的回波信号进行采样．经过A／D变换．采样值送入单片机内部进行比较、判别、计算．然后输出可控制信号幅度的增益码去控制AGC电路的受控级，实现对回波信号的增益控制．从而使得输出信号幅值稳定在一个窗口内．供后续电路处理。试验结果表明，该电路工作稳定，效果良好，达到了系统设计要求。     

跳频多普勒无线电引信信号处理器设计

信号处理器是跳频引信的一个核心电路。为了提高引信的可靠性,检测精度。抗干扰能力,必须考虑设计合理的信号处理器。文中充分利用了目标信号的频率、幅度和增幅速率这三个特征量．设计出具有幅度检测、增幅速率检测、带外干扰信号检测的信号处理器。理论分析和试验结果表明,该信号处理器能够使引信对目标信号的识别能力和抗干扰能力有较大提高。     

水声探测技术在火箭式深弹引信中的应用

一种水声近炸引信,适用于对鱼雷等水下目标实施拦截杀伤的火箭式深弹系统,设计中解决的技术问题有:对水下目标的识别技术、有效的测距方法及抗冲击过载技术。所采用的方法是通过对水下目标辐射噪声信号的能量检测、识别和能量变化的比较以及目标所发出的不同线谱的频率来判断和识别目标。验证试验表明,能对不同目标进行识别,并适时发出起爆信号。     

基于软件无线电的中频频谱监测方法的优化

针对卫星通信系统中对固定中频频段进行在线频谱监测的需求,提出一种中频直接采样,并进行数字信号处理的方法。该设计采用多相抽取滤波、信道划分等多种优化处理方法,克服了数据速率过高的瓶颈,最大限度简化了设计,减少了费用。     

高炸高引信总体技术方案研究

针对高炸高引信的使用特点设计了总体技术方案，将微弱信号检测理论和跟踪滤波技术引入高炸高引信的信号处理，理论分析和仿真结果表明，本系统对噪声具有很强的抑制能力并能有效地检测出目标信号。     

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.     

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.     

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.     

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.     

Experimental Research on Output Performances of Giant Magnetostrictive Actuator

The paper introduces the performances of magnetostrictive actuators and its applications, discusses the design methods for the structure and internal magnetic circuit of a giant magnetostrictive actuator, and makes tests on the output displacement and force characteristics for an actuator using homemade magnetostrictive material. The experimental result shows that the actuator has satisfactory output precisions and ranges in transient and stable states, and can be used in lowfrequency vibration control system of precise equipment.     

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.