Command filtered integrated estimation guidance and control for strapdown missiles with circular field of view

In this paper,an integrated estimation guidance and control(IEGC)system is designed based on the command filtered backstepping approach for circular field-of-view(FOV)strapdown missiles.The threedimensional integrated estimation guidance and control nonlinear model with limited actuator deflection angle is established considering the seeker's FOV constraint.The boundary time-varying integral barrier Lyapunov function(IBLF)is employed in backstepping design to constrain the body line-of-sight(BLOS)in IEGC system to fit a circular FOV.Then,the nonlinear adaptive controller is designed to estimate the changing aerodynamic parameters.The generalized extended state observer(GESO)is designed to estimate the acceleration of the maneuvering targets and the unmatched time-varying disturbances for improving tracking accuracy.Furthermore,the command filters are used to solve the"differential expansion"problem during the backstepping design.The Lyapunov theory is used to prove the stability of the overall closed-loop IEGC system.Finally,the simulation results validate the integrated system's effectiveness,achieving high accuracy strikes against maneuvering targets.

基于反射的Command模式实现Undo/Redo

针对经典Command模式在实现Undo/Redo功能时的两个缺陷,提出了基于反射的Command模式实现Undo/Redo的设计思路和实现方法,给出了该方法的数据模型,说明了事务处理的过程。

广灭灵(Command)防除大豆田杂草试验

广灭灵通用名为Fenoxan,化学名为2—(2—氯苯)甲基—4,4—二甲基—3—异(口恶)唑烷酮。系美国FMC公司近年开发的一种选择性除草剂。受农业部农药检定所委托,1986～1988年我所进行了广灭灵防除大豆杂草的试验。现将结果报告如下。一、材料与方法 (一)供试药剂:72％广灭灵乳油;48％氟乐灵乳油(意大利产);70％赛克津可湿粉(西德拜耳公司产)。 (二)试验处理: 1.播前处理:

MVC与COMMAND设计模式的应用

通过实现“模拟银行”转帐功能,详细阐述了在JSP与Servlet技术开发中,对MVC与COM-MAND设计模式的使用.

应用Command模式实现短信互动程序设计

介绍一种采用XML描述流程,应用Command模式实现短信互动流程的程序设计方法。详细介绍了如何用XML描述流程以及如何用Command模式实现自定义流程的执行。该设计方法使维护人员只需修改XML文件就可以自动实现流程变更。

VB中ADO对象的Command对象用法探讨

本文阐述ADO对象的Command对象用法,并给出编程实例。

COMMAND.COM命令处理文件的结构与使用

众所周知,DOS是个人计算机的核心软件,是计算机硬件资源和软件资源的管家,而命令处理文件COMMAND.

KBA Commander宽幅轮转胶印机版卡机构检修

KBA Commander宽幅轮转胶印机版卡机构在进口设备中比较少见,其独特的设计理念会给每个检修者留下深刻的印象。KBA Commander宽幅轮转胶印机版卡机构由版卡、定位销、间隔挡块、开夹气囊、气囊及衬层钢片、气阀等部件组成,在设备运行过程中遇到的较多故障是连接开夹气囊的气管因老化而出现破裂漏气,导致版卡打不开。一旦遇到这种情况,对大多数检修者来说就是一种煎熬!本文,笔者根据多年来的实际操作,分享自己的感受和解决技巧,供同仁参考借鉴。

使用Command设计模式实现编辑器的RedoUndo

设计模式是对于共性问题成功的解决方案,采用设计模式可以减少系统设计的复杂度,提高系统开发的效率[1]。Command模式是常用的23种设计模式中的一种。Command模式是将"动作"进行抽象,将与动作有关的所有信息进行封装,从而实现调用操作的对象与知道如何实现该操作的对象解耦。RedoUndo是现代编译器中必不可少的一种工具,可以提高工作效率。详细探讨了如何使用Command模式实现RedoUndo以及各种扩展。

基于MVC和Command设计模式的线号打印机软件系统开发

分析线号打印机软件需求和MVC框架设计的优势,充分利用Command设计模式的灵活性,将线号打印机的特定内容通过预定义的标记来适应不同的需求,由此提出一个基于MVC的软件系统。该系统为用户提供良好的交互界面,给线号打印机应用提供了有力的支持。

Observer模式与Command模式在条码采集系统中的应用研究

结合条码采集系统的设计与开发，探讨了设计模式中的Observer模式与Command模式，结果表明：使用Observer模式进行数据管理，使用Command模式进行功能管理，可以增强系统代码的重用性、灵活性和模块化，提高了系统开发效率。

Command and Control Cities in Global Space-economy Before and after 2008 Geo-economic Transition

The global economic downturn caused primarily by the US sub-prime mortgage crisis in 2007 engendered revenue loss of the multinational corporations. Existing studies have yet to depict the detrimental impacts on city＇s command and control functions induced by the sub-prime mortgage crisis together with its residual wave of global economic recession on the global spatial economy. Recent and previous studies have produced an ＇instant history＇ of the global spatial economy before the global economic downturn undermines the global economy in late 2008. How- ever, the waxes and wanes of major cities＇ command and control functions on the global economic arena before and after the outbreak of financial crisis and its associated geo-economic transitions are still poorly understood. This paper attempts to contribute a new set of customized data to update and fill in the gap in the literature with the investigation of the command and control functions of cities arotmd the world from 2005 to 2009. Particular attentions are paid to the time-space relationship of the geo-economic transition that can capture the recent historical images of the com- mand and control situation of different cities in the world.

Adaptive optimization of agile organization of command and control resource

Adaptive optimization is one of the means that agile organization of command and control resource （AOC2R） adapts for the dynamic battlefield environment. A math model of the adaptive optimization of AOC2R is put forward by analyzing the interrelating concept and research. The model takes the adaptive process as a multi-stage decision making problem. The 2-phases method is presented to calculate the model, which obtains the related parameters by running the colored Petri net （CPN） model of AOC2R and then searches for the result by ant colony optimization （ACO） algorithm integrated with genetic optimization techniques. The simulation results demonstrate that the proposed algorithm greatly improves the performance of AOC2R.

A GIS-based Earthquake and Tsunami Emergency Command System for Seaside Cities

In this paper the geographical information system （GIS） is applied to earthquake and tsunami emergency work and an earthquake and tsunami emergency command system （ETECS） for seaside cities is developed which is composed of a basic database and six subsystems. By employing this system, the responsible municipal departments can make rapid prediction before the occurrence of earthquake or tsunami, make commanding decisions concerning the disaster-fight during the disastrous event, and make rapid estimates of the casualties and economic losses. So that the government could conduct relief work in time and planning for future disaster reduction and prevention.

Differential geometric guidance command with finite time convergence using extended state observer

For improving the performance of differential geometric guidance command(DGGC), a new formation of this guidance law is proposed, which can guarantee the finite time convergence(FTC) of the line of sight(LOS) rate to zero or its neighborhood against maneuvering targets in three-dimensional(3D) space. The extended state observer(ESO) is employed to estimate the target acceleration, which makes the new DGGC more applicable to practical interception scenarios. Finally, the effectiveness of this newly proposed guidance command is demonstrated by the numerical simulation results.

Command Filtered Finite/Fixed-time Heading Tracking Control of Surface Vehicles

This paper investigates the heading tracking problem of surface vehicles with unknown model parameters.Based on finite/fixed-time control theories and in the context of command filtered control,two novel adaptive control laws are developed by which the vehicle can track the desired heading within settling time with all signals of the closed-loop system are uniformly bounded.The effectiveness and performance of the schemes are demonstrated by simulations and comparison studies.

Parameter identification of inertially stabilized platforms using current command design

Accurate parameter identification is essential when designing controllers for inertially stabilized platforms （lSPs）. But traditional identification methods suffer from observation measurement noise and operating restrictions of ISPs. To address this issue, a novel identification method based on current command design and multilevel coordinate search （MCS） algorithm without any higher order measurement differentiations was proposed. The designed current commands were adopted to obtain parameter decoupled models with the platform operating under allowable conditions. MCS algorithm was employed to estimate the parameters based on parameter decoupled models. A comparison experiment between the proposed method and non-linear least square method was carried out and most of the relative errors of identified parameters obtained by the proposed method were below 10%. Simulation and experiment based on identified parameters were conducted. A velocity control structure was also developed with disturbance observer （DOB） for application in disturbance compensation control system of an ISR Experimental results show that the control scheme based on the identified parameters with DOB has the best disturbance rejection performance. It reduces the peak to peak value （PPV） of velocity error integral to 0.8 mrad which is much smaller than the value （10 mrad） obtained by the single velocity controller without DOB. Compared with the control scheme based on sweep model with DOB compensation, the proposed control scheme improves the PPV of velocity error integral by 1.625 times.

Formal Analysis of Trusted Platform Module Commands for Compromising User Key

The Trusted Platform Module （TPM） is a dedicated hardware chip designed to provide a higher level of security for computing platform. All TPM functionalities are implemented in TPM corntrends to achieve specific security goals. We attempt to analyze the security properties of these commands, especially the key management API. Our study utilizes applied pi calculus to forrmlize the commands and determine how their security properties affect TPM key rmnagement. The attacker is assumed to call TPM comrmnds without bounds and without knowing the TPM root key, expecting to obtain or replace the user key. The analysis goal in our study is to guarantee the corre- sponding property of API execution and the integrity of API data. We analyze the security properties of TPM commands with a process reduction method, identify the key-handle hijack attack on a TPM newly created key, and propose reasonable solutions to solve the problem. Then, we conduct an experiment involving a key-handle attack, which suc- cessfully replaces a user key with an attacker＇s key using lmlicious TPM software. This paper discloses the weakness of the relationship between the key handle and the key object. After the TPM software stack is compromised, the attacker can hunch a keyhandle attack to obtain the user key and even break into the whole storage tree of user keys.

Geo-Spatial Database Creation for Wazirabad Canal Command Area

GIS assist in specific planning and decision-making processes in irrigation through the input, spatial analysis and output of relevant information. The real strength of GIS is its ability to integrate information. This integration power makes the scope of GIS almost infinite. The unique integration capability of GIS allows disparate data sets to be brought together to create a complete picture of a situation. GIS technology illustrates relationships, patterns and connections that are not necessarily obvious in any one data set but are amazingly apparent once the data sets are integrated. GIS also helps us to assess the performance of the irrigation command areas. GIS based system helps a canal to analyze the spatial information about its engineers and farmers to improve planning, management and supply of water resources to its corresponding blocks. In order to manage the water efficiently in the command area, it is needless to say that calculation and evaluation of water demands in detail at block and minor level to be given overriding priority. Blocks and Chak boundaries can be delineated from the Digital Elevation Model using GIS techniques. These boundaries will help to plan and allocate the water resources to improve the water allocation strategies and in turn water use efficiency and can make inter-canal comparisons. The delineated block boundaries can be refined exactly using the drainage, topography and existing canal network in GIS platform.

Application of Hidden Markov Models in Speech Command Recognition

In this study,vector quantization and hidden Markov models were used to achieve speech command recognition.Pre-emphasis,a hamming window,and Mel-frequency cepstral coefficients were first adopted to obtain feature values.Subsequently,vector quantization and HMMs(hidden Markov models)were employed to achieve speech command recognition.The recorded speech length was three Chinese characters,which were used to test the method.Five phrases pronounced mixing various human voices were recorded and used to test the models.The recorded phrases were then used for speech command recognition to demonstrate whether the experiment results were satisfactory.