一种小型化单通道被动毫米波成像制导技术

为实现被动毫米波成像制导技术的小型、低成本的实用化要求,提出一种新型的小型化单通道被动毫米波成像技术.通过被动毫米波成像制导技术的原理介绍,辐射计天线温度的计算,交流全功率毫米波辐射计的原理介绍,输出信号特征分析,以及辐射计输出信号采样系统的原理介绍,系统地进行了该项毫米波被动成像制导技术的研究.     

开关扫描技术在被动毫米波成像中的应用

针对透镜焦平面全通道被动毫米波成像系统所用接收机数量多,成本高等问题,将开关扫描技术引入被动毫米波成像.在透镜天线焦平面上设置2维馈源天线阵列,多个馈源天线通过开关共用一个毫米波接收机,通过开关选择来完成对景物的扫描成像.系统中毫米波接收机采用直接检波式接收机,聚焦透镜采用组合透镜系统,馈源天线及毫米波器件采用低温共烧陶瓷(LTCC)技术集成.分析表明,这种开关扫描被动毫米波成像系统是可行的,系统所用接收机数量大大减少,成本降低.     

毫米波辐射计探测直升机研究

介绍了一种圆锥扫描体制的毫米波辐射计探测识别直升机的方法，在分析被动毫米波探测直升机工作原理的基础上，建立了辐射计探测直升机目标的数学模型。根据波形特点给出了目标识别方案，这种毫米波被动敏感器可以较准确的探测识别直升机，这种方法较成像等技术容易实现，适于智能地雷应用。     

毫米波焦平面阵列成像技术

毫米波焦平面阵列成像系统是毫米波被动成像领域最新发展起来的一种重要体制,其应用已从一般民用向军事上的武器制导系统发展。本文在分析其成像原理的基础上,给出了这一体制的系统结构和电路组成,并对其应用及意义作了具体介绍。     

用于隐匿武器检测的PMMW焦平面成像系统设计

介绍了被动毫米波焦平面成像系统的工作原理；并以机场，海关等处的安检为应用背景。给出了一种用于隐匿武器检测的焦平面系统的详细设计过程及实验数据。     

PMMW装甲目标图像提升小波去噪与特性分析

毫米波被动探测技术在反装甲导弹和末敏弹的制导中起着重要作用.针对毫米波被动探测目标图像是灰度级形式,且毫米波被动探测的限制是图像的分辨率,给出了毫米波被动探测装甲目标的提升小波去噪.为进一步刻画毫米波被动探测目标辐射的表征方法,在分析毫米波被动探测能力的基础上,给出了目标毫米波被动探测隐身要素分析,并给出了3 mm被动辐射计探测双层隐身迷彩装甲目标的实验数据与辐射分布图,及其毫米波被动探测辐射特性分析.     

近程毫米波合成孔径辐射计成像系统分析

设计了一套用于近程被动成像的毫米波合成孔径辐射计( MMW-SAR)系统，由在水平和垂直方向上扫描的一对辐射计以及后端的信号处理系统组成，可对几米内的目标成像。文中给出了成像系统的总体结构和成像算法；并提出近程成像的特点是需要相位补偿；并首次在直角坐标系下推导了合成孔径成像公式，简化了表达式和相位补偿运算；另外在计算相关函数时提出采用多相滤波算法，有效地克制了相关函数虚部的波动，提高了成像质量和系统效率。     

毫米波成象传感器

本文介绍美国研制的3毫米辐射计成象系统。在雨、雾、云天和存在烟雾、尘埃的战场环境中,红外和光学传感器已不能用的情况下,毫米波成象具有独特的优越性。被动毫米波探测与计算机数字处理结合起来,给所探测地面绘出了清晰可辨的“彩色”图象。实验证明:毫米波成像完全可用于警戒和遥感。     

PMMW装甲目标滤波去噪与辐射特性分析

毫米波系统具有全天候或低能见度条件下工作的能力,但毫米波被动探测图像的限制是分辨率。维纳滤波是对退化图像进行有约束处理的一种有效算法,文中给出了毫米波被动探测装甲目标的维纳滤波去噪。为进一步刻画毫米波被动探测目标辐射的表征方法,在分析毫米波被动探测能力的基础上,建立了目标毫米波被动探测辐射截面分辨能量体的新概念,并给出3mm被动辐射计探测单层隐身迷彩装甲目标的辐射截面能量分辩体的实测与分析研究。     

毫米波被动探测目标定位方法研究

说明了毫米波系统有着较微波、红外、光学系统不同特性的优点.针对涂层隐身问题,研究了探索毫米波被动辐射计探测涂层隐身技术.考察了毫米波被动探测目标的定位与计算方法.给出了毫米波被动探测距离公式,以及毫米波被动探测定位概率原理研究.然后根据探测的目标天线温度数据,给出了探测目标辐射温度的计算方法和定位计算方法.     

Expert Systems Aimed at General Design of Projectiles

Expert systems aimed at the general design of projectiles can implement a series of intelligent designs, such as the design of HE shell, the scheme expounded and proved, the emulation analysis and calculation, etc. Aiming at the product design feature, the expert system adopts the object-oriented knowledge representation and all kinds of inference control engines to describe and reason the relevant knowledge regarding the product through the microcomputer. It embodies the foundation of emulation analysis and simulated manufacturing of the shell. It makes use of the method that knowledge expression is combined with condition of inference to carry out the overall design and emulation and reference.The paper gives the ways through which the functions can be achieved, gives the modularization of reference and the design methods of systematization, puts forward the method of knowledge expression and working interface, and supplies a platform for similar products of the shell category that can be quickly designed.     

Three-dimensional Numerical Simulation of Combustion Field in the Combustion Chamber

In order to study the effect of rotation on the combustion in the underwater vehicle, a two-phase turbulent combustion process is described with Reynolds stress turbulence model, eddy-dissipation turbulent combustion model, P-1 radiation model and particle tracking model of liquid. The flow in the rotating combustion chamber is simulated at two different working speeds, 0 r/min and 1 000 r/min by Fluent software. The temperature, gas velocity, static pressure of wall and fuel concentration are computed and compared. The results show that the combustion in rotating combustor is faster and more effective.     

Software Communication Architecture Implementation and Its Waveform Application

This paper attempts to do a research on the development of software defined radio（SDR） based on software communication architecture（SCA）. Firstly, SCA is studied and a whole reference model of SCA3.0 core framework （CF） is realized; Secondly, an application-specific FM3TR waveform is implemented on the platform of common software based on the reference model; Thirdly, from the point of view of real-time performance and software reuse, tests and validations are made on the above realized CF reference model and FM3TR waveform. As a result, the SCA-compliant SDR has favorable interoperability and software portability and can satisfy the real-time performance requirements which are not too rigorous.     

Parameter Identification for the Valve Control Cylinder System of a Hydraulic Manipulator

In mechanical, hydraulic and electronic systems, the determination of system parameters is often challenging because liquid parameters often change significantly, due to variations in working and environmental conditions. Therefore, it is of significant practical importance to identify those parameters through experimental procedures. A systematic approach to identifying parameters in the valve controlling cylinder system of hydraulic manipulators is provided. It first derives the transfer function of the system, and then uses P control of PID control to predict system parameters. The predicted parameters are further validated using PID control. The prediction through simulation using MatLab language is utilized, which agrees well with experimental results.     

Dynamic Simulation of the Tank Gun Recoil Response

By using the ATV module of MSC. ADAMS, the dynamic simulation of recoil response of tank gun is analyzed.How the recoil force affects the bodywork and the suspension during gun firing, as well as the changing status of the gun muzzle‘s velocity are gained. All results and analyzing methods are offered for the designing basis of optimizing tank vehicle-gun match. The constructive exploration is beneficial to improving the general capability of tank.     

Survey of Controllable Suspension System for Off-road Vehicles

The controllable suspension system can improve the performances of off-road vehicles both on road and cross-country. So far, four controllable suspensions, that is, body height control, active, semi-active and slow-active suspensions, have been developed. For off-road vehicles, the slow-active suspension and the semi-active suspension which have controllable stiffness, damping and body height are more appropriate to use. For many years, some control methodologies for controllable suspension systems have been developed along with the development of modern control theory, and two or more original control methods are integrated as a new control method. Today, for military or civilian off-road vehicles, the R&D of controllable suspension systems is ongoing.     

An Efficient Key Agreement Framework to MANET

Protocols for key management are compared and evaluated from the point of view on mobile ad hoe networks （MANET）. The issues of fault-tolerance and efficiency of key distribution protocols for group communications in MANET are addressed. Most key distribution protocols existing today are primarily designed for wlre-line networks. These protocols either fail to work as intended or cannot work at all when they are applied to the demanding environment of MANET. Parameters and performance of different protocols are analyzed, and then a fiat is given out, on which new protocols or existing ones are designed and modified, so that they can be robust, scalable and efficient in MANET.     

Finite Element Analysis of Fretting Behavior Between an Engine Cylinder Block and a Main Bearing Cap

The finite element analysis of the fretting behavior between a cylinder block and a main bearing cap is presented. The stresses, relative fretting slip, fretting friction work parameter W and crack initiation location parameter G on the fretting contact surface of the cylinder block are obtained and analyzed. It shows that the fretting fatigue problem of the cylinder block can be quantitatively explained by W or G. The effects of pretightening force, friction factor and material combination of the cylinder block and the main bearing cap are studied. The computational results indicate that the fretting fatigue of the cylinder block can be allayed by increasing the elastic modulus of the cylinder block, but not by changing the other two factors.     

A Physical Model of Electromagnetic Force from PEMA Acted on Metal Projectiles

Electromagnetic armor is a new conceptual combat vehicle technology, which improves remarkably the defensive capability and maneuverability of vehicles. The authors present definitely to apply the electromagnetic theory to analyze the electromagnetic armor. Based on electromagnetics, the experienced expression of projectile and the physical model of PEMA （passive electromagnetic armor） are obtained when electric current flows through the system, and a computer sim- ulation is given.     

The Kinematics Analysis of the Hydraulic Mine-clearing Mechanical Manipulator

Through analyzing the kinematics of the hydraulic manipulator operating system, according to the rules for set-ing up the D-H coordinate system, the generalized coordinate of the manipulator system is established. The rotating and moving joints are selected from the mechanism as joint variables. Each generalized transformation matrix of joints is worked out. The kinematics equation at the finger end of the manipulator is calculated. The obverse solution for the manipulator is gained. The geometrical operating parameters and primary technical specification of the manipulator system are simulated through the computer. The simulative result has shown that the manipulator operating system meets the working task requirements. This research provides theoretical basis for optimizing structural parameters of the manipulator operating. So it also is justified the feasibility for mechanical manipulators to be used in the engineering equipment platform of the hydraulic excavator.