基于计转数炮口初速的数理统计外推法

针对直线外推法反推的虚拟初速与雷达测得炮口初速存在系统误差且需要对这一误差进行补偿的问题,提出一种基于计转数炮口初速的数理统计外推法。该方法基于大量试验结果进行数理统计,得出空炸炸点精度最高的引信测速应增加的百分比,从而将引信测得初速反推到炮口初速,通过修正引信空炸时间使空炸炸点精度提高。实验验证结果表明,基于计转数炮口初速的数理统计外推法在炸点偏差和炸点的密集度方面都比一般采用的直线外推法精度更高,提高了引信的定距空炸精度,验证了所提方法的有效性。     

半隐身弹丸对雷达的隐身性能研究

为了实现弹丸对炮位侦察校射雷达隐身的目的,研究弹丸对雷达隐身的技术,在弹丸外形隐身的设计上采取全隐身和半隐身两种结构方式。全隐身弹丸是完全依据外形隐身设计规范而设计的,其结构为次口径碟形隐身弹丸,虽然其隐身效果突出,但牺牲了弹丸威力和精度。为了在保持弹丸威力和精度前提下实现雷达隐身的目的,采用全膛隐身弹丸结构,弹丸前定心部表面不涂覆吸波材料、直接接触炮膛,成为半隐身弹丸。设计制造X波段、S波段半隐身弹丸,并在试验中利用炮位侦察校射雷达搜索、跟踪半隐身弹丸,检验半隐身弹丸对雷达的隐身效果,试验结果证明半隐身弹丸的确具备隐身性能。     

雷达装备实战化检验

为推动军事代表在雷达装备领域开展实战化检验工作,从雷达装备实战化检验的概念定义、项目设置、认识误区3个方面进行研究.明确了雷达装备实战化检验的概念定义和项目设置,提出了雷达装备实战化检验应作为符合性检验有效补充的论断,为军代表深入开展雷达装备实战化检验奠定了理论基础,也可对其他装备开展实战化检验提供借鉴参考.     

蒙特卡洛法在导弹末制导雷达对目标的位置捕获概率估计中的应用

根据导弹末制导雷达搜捕参数的设计, 采用蒙特卡洛法估算了每种设计状态下末制导雷达对目标的全程位置捕获概率及一次捕获概率, 同时对所有统计试验的计算结果进行了精度评定.结果表明, 其统计参数值的估计误差满足工程设计要求, 从而检验了末制导雷达搜捕参数设计的正确性与准确度.     

蒙特卡洛法在导弹末制导雷达对了标的位置捕获概率估计中的应用

根据导弹末制导雷达搜捕参数的设计，采用蒙特卡洛法估算了每种设计状态下末制导雷达对目标的全程位置捕获概率及一次捕获概率，同时对所有统计试验的计算结果进行了精度评定．结果表明，其统计参数值的估计误差满足工程设计要求，从而检验了末制导雷达搜捕参数设计的正确性与准确度．     

雷达嵌入式大气折射修正仪

大气折射效应是影响雷达精确定位和测速的主要误差源之一.为了提高雷达的探测精度,通过建立全国各地地面折射率与空中大气折射率剖面的相互关系,以及选择较高精度的折射误差修正方法,设计了一种由地面折射率仪、全国大气折射率剖面与地面大气折射率关系数据库、数据处理单元和雷达数据接口等组成的雷达嵌入式大气折射修正仪.仿真结果证实,采用雷达嵌入式大气折射修正仪后,不仅可使大气引起的雷达折射误差修正精度提高到94%以上,而且具有实时、快速等特点.该设备可直接应用到在役雷达系统和正在生产的雷达中,以提高雷达的探测精度.     

雷达性能检验和鉴定中复杂电磁环境构建的研究

复杂电磁环境已成为信息化战场的显著特点。为了打赢未来信息化战争,在复杂电磁环境下进行雷达性能检验和鉴定显得尤为必要。明确雷达性能检验和鉴定中复杂电磁环境的构成要素,把握雷达性能检验和鉴定中复杂电磁环境的构建原则和方法,分析了雷达性能检验和鉴定中复杂电磁环境的构建流程的现实意义。     

某型雷达电视跟踪测量系统及精度分析

雷达对目标进行近距离、高精度实时轨迹测量时,雷达的跟踪精度受地面杂物、角闪烁等因素影响较大,测量精度无法得到保证。文中介绍了某型雷达电视跟踪测量系统,该系统在近距离跟踪状态下使用电视跟踪,可提高跟踪精度。文中对系统的测量精度进行了分析。     

高机动雷达方位标定方法

雷达探测方位精度是系统的重要性能指标,方位标定精度是雷达探测方位精度提高的前提,从高机动雷达方位标定的设计要求出发,介绍了雷达方位标定的方法以及各种方法的优缺点,并在此基础上总结了方位标定的设计步骤,并进行了寻北仪标定和GPS标定相结合的雷达方位标定系统设计,在满足高机动雷达使用要求的前提下,提高了方位标定的使用可靠度,对今后雷达的方位标定设计都具有一定的参考意义。     

跟踪雷达精度检飞试验标准值修正方法

为了分离炮瞄雷达跟踪精度检飞试验中出现的体效应误差,提出一种采用GPS和光电经纬仪的标准值数据修正方法。分析了跟踪雷达精度检飞试验中测角精度统计误差产生的原因,介绍了GPS数据的修正方法,详细给出以光电经纬仪为标准设备的系统误差、随机误差统计的数据处理方案,并以某型雷达精度检飞为实例,对2条检飞航路的一次差进行处理得到对标准值数据修正结果。分析结果证明：该2种方法可以在跟踪雷达精度检飞试验数据处理中有效消除体效应误差,从而提高被试雷达精度统计结果的准确度。     

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.     

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.     

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.     

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.     

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.     

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.     

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.