关于导弹精度快速评定方法的探讨

根据文献中提到的导弹制导精度快速评定方法,讨论了在飞行试验中由于试验样本数量、试验条件控制诸因素的制约,运用有关导弹快速精度评定的具体实施方法时,进行落点偏差数据检验方法和精度指标检验方法选择的问题.     

导弹武器系统飞行试验测量误差分析与处理

从导弹武器系统飞行试验的落点精度与误差的基本概念入手,分析了样本数据中的误差对精度评定的重要影响,给出了消弱系统误差的方法,并提出异常值的处理方法及检验准则.     

导弹命中精度仿真试验及评估方法研究

探讨了在导弹命中精度评估过程中,依靠实弹靶试弹道数据检验精度仿真模型、仿真技术、试验设计理论和数据统计理论实现命中精度的全面评定的可行性.仿真模型校验方法、仿真试验方案设计以及精度数据统计方法是主要技术重点.依据文中流程方法,可以指导技术人员进行导弹命中精度的评定.     

飞行试验弹落点检验域的划定

对飞行试验弹的落点检验域如何划分进行了初步探讨，给出了不考虑系统偏差时适合导弹精度评定的落点检验域的划定范围，并描述了该域所应在的位置及其形状，最后以某型号为例，说明了这种划定的意义     

炮射导弹落点精度评定

文中根据炮射导弹的射击特点，分析了炮射导弹落点精度的概念及其相关指标．提出了评定炮射导弹落点精度的方法。     

基于先验融合的Bayes递归精度评定方法

制导工具误差分离与落点精度分析是武器精度评定中最为关心的问题之一.为充分融合观测信息进行精度评估,在对制导工具误差系数的测试值进行先验融合的基础上,结合遥外弹道观测数据求解制导工具误差系数,并将相应的制导工具误差与弹道差的Bayes实时融合结果进行了比较.建立了递归的落点精度评估方法,将由地面测试先验导出的落点先验与落点观测数据进行加权融合,给出落点评定结果.理论分析和仿真计算表明,信息融合后得出的评定结果更加稳健.     

一种基于神经网络的迭代制导方法研究

利用神经网络强大的函数逼近能力进行落点偏差预报,仿真表明在一定精度要求下可以解决落点偏差实时计算问题.在此基础上,将导弹落点偏差视为当前速度、位置及待增速度的函数,并在当前状态下线性展开,利用需要速度的概念及文中所提供的方法可快速迭代确定出导弹实时待增速度,仿真表明迭代次数一般不超过3次,然后利用闭路制导关机及导引方法对导弹实施控制.由于以"真实"落点偏差为基础,大大减小了制导方法误差,提高了导弹射击精度.     

导弹命中精度评定和评定精度快速分析方法

根据国际、国际标相关规定和蒙特卡罗数字仿真方法，提出了导弹命中精度评定和评定精度的快速分析方法，可进行弱本异常值分析，落点的纵向偏差与横向偏差的正态性分析，落后的纵向偏差与横向偏差的相关性分析，导弹园概率偏差分析，以及园概率偏差评定结果的精度分析，并且编写了规范的计算程序，该方法可以方便的应用于导弹命中精度分析。     

助飞反潜鱼雷落点精度的Bayes评估方法

针对助飞反潜鱼雷落点精度指标特点(采用标准方差σ表示)以及评估该指标过程中遇到的本舰定位误差过大的实际问题,提出对该指标采用验前信息的二项分布Bayes假设检验方法进行综合评定;采用数据预处理方法将舰位定位偏差分离.算例表明:该方法能有效利用试验数据,对助飞反潜鱼雷落点精度指标进行科学充分的评定和估算.     

弹道导弹加表逐次通电误差分析和修正

加速度计误差在很大程度上决定了导弹的落点误差,对加速度计标定系数进行误差分离和补偿可以有效提高导航精度.在分析加速度计误差传播模型基础上,利用导弹特殊时刻的相关信息,对加速度计K0x和K1x项误差进行分离和补偿.仿真计算表明,这是一种很有效的修正方法,可以有效提高导弹的落点精度.     

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.     

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.     

Design and Analysis of Test Schemes of Static Postponing Time on Shrapnels Used to Riot Control

The test scheme of static postponing time given in our actual national military test standard on shrapnels used to control riot is a nine-point test scheme on the combined action of three kinds of temperatures and three kinds of pressures,the consumed ammunitions are more excessive. Statistic analysis and tentative checkout about a lot of test data are done,feasibility gists are put forward for optimizing of the test design scheme. The optimizing design and data analysis of test scheme of the item are done by managing uniformity design theory, two scientific and reasonable six-point test schemes are confirmed. The feasibility and reliability of the optimizing design schemes put forward above are proved ulteriorly by test validating. The gained schemes not only have good design uniformity and little ammunition wastage and meet the test demand, but also have better forecast ability for the result data of other points using the mathematic models from the actual test points.     

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.     

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.     

Design of Non-fragile Satisfactory Estimator for Linear Continuous Perturbed Stochastic Systems

The design problem of non-fragile estimator is addressed for a class of perturbed linear continuous systems. The perturbations occur on the plant and estimator parameters. The estimator designed should force the error system to achieve the desired decay rate and force the steady error variance less than the specified upper bound irrdevancy of the admissible plant perturbations and estimator perturbations. Consistency problem of the decay rate with the variance upper bound is first considered via linear matrix inequality （LMI） approach. The solution of the estimator parameter under specifications to be consistent is then discussed. The consistency condition of specifications and estimator parameter solution are transformed to feasible or minimum problems subject to a set of LMI respectively. The method is illustrated by a numerical example.