星载全方位SAR联合图像配准和DEM提取方法

为了利用单颗合成孔径雷达(SAR)卫星单航过录取数据实现数字高程模型(Digital Elevation Model, DEM)的高精度提取,基于星载全方位SAR获取的多角度图像序列,提出了多角度SAR图像序列配准和DEM提取联合处理方法。该方法根据小方位夹角图像对间配准偏移量与大方位夹角图像对间配准偏移量之间的关系,以及配准偏移量与目标高程之间的关系构建线性方程组,利用最小二乘方法解算该方程组,同时获取配准偏移量和目标高程。仿真数据处理结果验证了该方法的有效性和精确性。     

俯仰角-多途时延联合定位算法误差分析

利用目标俯仰角和多途时延联合对目标定位适用于小尺度平台,具有重要的应用价值。通过数值仿真分析了接收深度测量误差、目标俯仰角测量误差、多途时延测量误差和海水声速测量误差等因素对目标定位精度的影响。得出结论:目标俯仰角和多途时延的测量误差是影响目标定位精度的主要因素,而接收深度和海水声速测量误差属于次要因素。     

基于异步量测的多雷达方位误差配准算法

在多雷达数据处理系统中,系统误差是影响目标跟踪和数据融合质量的一个重要因素,且正北方位误差是系统中影响较大的系统误差.针对实际系统中,不同雷达对同一目标的量测大多是异步这一现状,文中提出了采用卡尔曼滤波器进行异步量测的方位误差配准,该算法可将时间对准、位置和方位误差估计同时完成,实时进行方位误差的配准处理.通过仿真验证了算法的可行性和有效性.     

单平台主／被动雷达制导异步数据融合算法研究

为改善主／被动雷达对目标的跟踪性能，在主／被动雷达双模制导模式下，对主／被动雷达的测量数据进行融合处理。由于主／被动雷达测量周期不同，导致主／被动雷达测量数据不同步，文中对于不同步的信息、采用基于最小二乘法的时间配准方法，使之信息同步；对同步后的主／被动雷达数据采用带反馈的卡尔曼滤波算法，由于被动雷达仅测得目标的角度信息，而主动雷达可得到目标的角度和距离信息，本文将融合中心的状态估计和预测协方差反馈给被动雷达。仿真结果表明，融合中心能够实现对目标的状态估计，且反馈的利用可以明显改善局部传感器的估计精度，能够有效地减小系统动态误差。     

实时弹道数据处理时间修正分析

根据地面测量设备的测量原理，结合测控系统实时信息传输体制，分析了数据测量中隐含的时延问题，并进行了定量的描述。针对时延从弹道处理和软件实施两方面进行了剖析，提出了可行的时延修正方法，对提高实时数据的处理精度有一定的指导作用。     

雷达系统误差协同配准算法研究

雷达系统误差的配准方法受公共目标选取、目标运动预测、异步时间对齐等因素的影响，在实际应用中受到较大限制。利用数据链网络的通信功能和时间同步功能，论文提出了一种协同的配准算法，利用飞机自身构造的虚拟坐标系，获得配准的高精度基准源，实现对雷达的有效系统误差估计。算法基于Kalman滤波器实现，对存储和计算能力要求不高并具有良好的收敛性能，其估计精度较好，而且对采样周期没有要求，符合数据链和战术互联网的实际传输要求。     

靶场末区多传感器数据配准研究

从工程应用观点出发研究靶场末区多传感器数据融合系统设计,通过分析各传感器的特点,给出了一种具有全天候和可靠测量的靶场末区融合系统结构;主要研究了融合系统中光电经纬仪时间和空间的数据配准方法,并给出靶场末区多传感器数据融合处理的主要步骤.试验结果证明,该融合系统能够提高落点测量的可靠性和精度.     

鱼雷实艇靶末弹道测量算法分析与误差仿真

提出了一种同步工作方式下鱼雷实艇靶末弹道测量的线性、非线性算法，分析了测量误差，并进行了误差仿真，给出了误差分布曲线．仿真结果表明，基阵位置误差和时延测时误差对定位精度影响较大，测声速误差的影响较小，而系统的姿态修正误差对定位精度的影响不容忽视．     

一种基于固定目标进行误差配准的方法

文中在假定系统误差不断变化的基础上,提出了一种使用固定目标进行误差配准的方法,该方法能有效的消除随机量测噪声对配准效果的影响,算法简单、有效.仿真表明该方法在配准精度和运算时间上都明显优于其他几种误差配准算法.     

动态事件触发机制下多智能体系统固定时间跟踪

针对受扰非线性多智能体系统跟踪控制问题，提出一种基于动态事件触发机制的固定时间积分滑模控制方法。设计与相对状态信息相关的新型积分滑模面且提出分布式控制协议，基于测量误差和滑模面构造动态变量和动态事件触发函数。采用固定时间稳定性原理证明，若选取适当的控制参数则可使多智能体系统在固定时间内实现动态事件触发机制下的跟踪控制，且避免Zeno现象。该控制方案能够有效抑制系统扰动的影响，减少多智能体系统通信和计算资源的消耗，且避免收敛时间对系统初始状态的依赖。仿真结果表明，新提出的动态事件触发控制器使得多智能体系统在固定时间内实现跟踪控制，降低触发频率而节省资源，更适用于实际应用。     

Stability of the Third Generation Intensifier under Illumination

The stability under illumination of transmission-mode GaAs photocathode sealed in the third generation intensifier is investigated by use of spectral response testing instruments. The variations of spectral response with the illumination times under weak and intense illumination are compared. The variations of photoemission performance parameters are also characterized. The results show that during initial several weak illuminations photocathode behaves no evident decay and a maximum sensitivity is achieved, while under intense illumination the sensitivity of photocathode begin to decrease largely at the first illumination. The calculated performance parameters show that the variation of surface escape probability with illumination times is a direct cause of instability of photocathode. It is also found that under intense illumination peak wavelength is moved towards short-wave and peak response is decreased, which shows that the ability of long-wave response of photocathode is decreased.     

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.     

Passive Acoustic Radar for Detecting Supersonic Cruise Missile

A Passive Acoustic Radar is presented as a necessary complement to electromagnetic wave radar, which will be expected to be an effective means for detecting cruise missiles. Acoustic characteristics of supersonic flying projectiles with diverse shapes are expounded via experiment. It is pointed out that simulation experiment could be implemented using bullet or shell instead of cruise missile. Based on theoretical analysis and experiment, the ““acoustic fingerprint““ character of cruise missile is illustrated to identify it in a strong noise environment. After establishing a locating mathematical model, the technique of acoustic embattling is utilized to resolve a problem of confirming the time of early-warning, considering the fact that velocity of sound is much slower than that of light. Thereby, a whole system of passive acoustic radar for detecting supersonic cruise missile is formed.     

Super-resolution Restoration of Remote-sensing Images

A novel image restoration scheme, which is super-resolution image restoration algorithm Poisson-maximum-afterword-probability based on Markvo constraint （MPMAP） combined with evaluating image detail parameter D, has been proposed. The advantage of super-resolution algorithm MPMAP incorporated with parameter D lies in the fact that superresolution algorithm MPMAP model is discrete, which is in accordance with remote-sensing imaging model, and the algorithm MPMAP is proved applicable to linear and non-linear imaging models with a unique solution when noise is not severe. According to simulation experiments for practical images, super-resolution algorithm MPMAP can retain image details better than most of traditional restoration methods; at the same time, the proposed parameter D can help to identify real point spread function （PSF） value of degradation process. Processing result of practical remote-sensing images by MPMAP combined with parameter D are given, it illustrates that MPMAP restoration scheme combined PSF estimation has a better restoration result than that of Photoshop processing, based on the same original images. It is proved that the proposed scheme is helpful to offset the lack of resolution of the original remote-sensing images and has its extensive application foreground.     

Design and Simulation of TF and TA Controller for Missile

A nonlinear terrain following(TF) and terrain avoidance(TA) controller is proposed for missile control systems. Based on classical TF algorithm (adaptive angle method), a new method for TF controller is proposed by using angle of attack. A method of obtaining terrain outline data from digital elevation map (DEM) for TF control is discussed in order to save store space. A TA algorithm is proposed by using bank-to-turn technique. The block control model, which is suitable for backstepping design, is given for nonlinear model of missile. Making full use of the characteristics of the system and combining block control principle and backstepping technique, a robust controller design method is proposed. Uncertainties in every sub-block are allowed, and can be canceled by using the idea of nonlinear damping. It is proved that the state tracking errors are converged to a neighborhood of the origin exponentially. Finally, nonlinear six-degree-of-freedom simulation results for the missile model are presented to demonstrate the effectiveness of the proposed control law.