基于自适应时频分布的瞬时频率估计算法

为了改善噪声条件下信号瞬时频率的估计方差及减少瞬时频率估计的计算量，提出了基于信号自适应最优核时频分布的瞬时频率估计算法及一种改进算法。在改进算法中，计算自适应时频分布时，综合利用线性时频分布（Gabor变换）和正交时频分布（Wigner- Ville变换）的特点生成一种基于信号的自适应时频分布。仿真和实际数据处理结果表明，改进算法同基于信号的自适应最优核时频分布的瞬时频率估计算法相比具有计算量小、方差接近的优点。     

改进粒子滤波算法研究

重采样思想能解决粒子滤波中的粒子退化问题，但却导致粒子多样性丧失的现象，使描述状态后验概率密度的粒子不够充分。围绕如何增加粒子的多样性，已提出的改进算法包括MCMC移动步骤及正则化粒子滤波（RPF）算法。讨论2种改进算法的基本思想及步骤，通过对一典型标量非线性系统的仿真实验，分析改进算法的性能特点。实验结果表明，2种改进算法都有效增加了粒子的多样性，缓解了粒子匮乏问题。     

超宽带SAR利用改进CS算法成像

在原始Chirp Scaling（CS）算法的基础上．详细推导了改进CS算法．并利用改进CS算法对超宽带合成孔径雷达（UWB SAR）进行成像。将成像结果与原始算法的成像结果比较后，其结果证明该算法突破了原始算法的局限性．能对大处理角的超宽带合成孔径雷达成像。     

闪烁噪声环境下目标跟踪的UPF算法研究

介绍了一种改进的粒子滤波（PF）算法——无味粒子滤波算法（UPF）。该算法结合UKF（unscented Kalman filter）和PF算法，利用UKF对非线性系统的处理能力，用UKF得到粒子滤波的重要性采样密度函数，从而克服了PF没有考虑最新量测信息和UKF只能应用于噪声为高斯分布的不足。在给出的闪烁噪声统计模型基础上．将UPF、PF算法在雷达目标跟踪中进行了比较，仿真结果表明该方法可以取得比标准的粒子滤波更快的滤波收敛性和更高的滤波精度。     

基于粒子群算法的仿真任务共同体服务选择算法优化研究

在研究粒子群算法（ PSO）及其改进的DGOSS算法、STCSSA算法基础上,从仿真任务共同体的定义、服务选择界定及服务品质（ QoS）描述出发,改进设计了PSO的惯性权重动态调整策略,建立了一种优化的仿真任务共同体服务选择算法（ ITCSSA）;通过仿真对比验证表明：ITCSSA算法较DGOSS算法、STCSSA算法有更好的收敛速度、精度和适用性,对于多用途仿真系统的资源分配优化具有一定的参考价值。     

人工神经网络的MB─P学习算法及其在毫米波辐射计目标识别中的应用

简要地介绍了人工神经网络的一种改进的误差后向传播学习算法（ＭＤ─Ｐ）。并将这种算法用于毫米波辐射计目标识别系统，仿真结果表明，其分类精度很高，具有较高识别率。     

基于LM优化算法的BP神经网络目标识别方法

误差反向传播算法（Back-propagation简称BP算法）是当前前馈神经网络训练中应用最多的算法。针对BP算法存在局部极小点，收敛速度慢等缺点，通过采用基于优化理论的Levenberg-Marquardt（LM）算法来改进BP算法。对提取的目标瞬态特性特征归一化后作为BP神经网络的输入，通过Matlab仿真对网络进行调整，并将训练好的网络进行军事目标识别。结果表明，该方法合理可行，且收敛速度快，预测精度高，为目标识别提供了一种新方法。     

固定指数加权模糊自适应EKF研究及其应用

为了改善扩展卡尔曼滤波（EKF）算法在机动目标跟踪中的跟踪性能，文中研究了一种固定指数加权模糊自适应扩展卡尔曼滤波技术，通过监视理论残差和实际残差的协方差一致程度。应用模糊推理系统不断调整滤波协方差，对扩展卡尔曼滤波器（EKF）进行在线自适应控制．最终实现最优估计。仿真结果表明，改进的算法稳定性高，精度得到明显改善．用于弱机动目标跟踪效果较好。     

最小均方误差波束赋形算法及其改进算法的性能分析

介绍了最小均方（Least Mean Square，LMS）算法及其改进算法：变步长LMS（Varied Step Size LMS，VSSLMS）算法和稳健变步长（Robust VSSLMS，RVSSLMS）算法，并根据波束赋形算法必须具有较快的响应速度和收敛速度的要求，用Matlab重点对每个算法的稳态误差和步长变化情况进行仿真比较。仿真结果进一步证明了RVSSLMS算法具有更小的稳态误差和更快的收敛速度，更具有实用价值。     

基于一种新型神经网络的姿态控制故障诊断方法

在导弹姿态控制系统的故障检测和诊断中，针对BP神经网络自身存在的收敛速度慢等缺点，介绍了一种新型神经网络——带偏差单元的递归神经网络的结构及算法。将它和一改进算法的BP（称为FBP）网络分别用来对同一导弹姿态控制系统进行故障诊断，结果表明，这种算法提高了故障诊断的快速性，增加了诊断的准确性，故障诊断的正确率优于FBP神经网络。     

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.     

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.     

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.     

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.     

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.     

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.     

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.