Research and implementation on RS-485 serial communication between digital servo controller based on DSP and CPLD of BLDCM and PC control software. Motor moves according to Host software’s given actuation instructions; Host software using the virtual instrument LabVIEW, sends control instructions, displays, saves and tabulates feedback data such as displacement and current. The test results prove that the system has a good servo and real time monitoring performance.

Model-Based Design is an efficient approach for complex embedded control systems,which provides a general design and test platform.Verification and test play a pivot role in system design process and keeping the quality of products.In accordance with the application of the Model-Based Design and Verification and test in the design of practical system,a detailed analysis on each step during the model-based test and validation is presented,including static test,dynamic test,and the test in host and target environment.Finally,the test and validation for a flight control software is presented in order to prove that the system design meets the requirements.

The research of the model and feature of ramjet engine is an important task,which is effictive to ramjet engine investigation and control system design.In this paper,the mathematic model of ramjet engine was established for feature calculation,and a ramjet engine simulation model was built based on simulink.The calculation results of different flight conditions were analyzed,especially the influences of various inlet conditions on the shock-wave intensity.The model's reliability was verified through comparison with the model parameter in GasTurb which indicated that the model can be used in ramjet initial overall design.

The real time extension system(RTX) is adopted to implement data acquisition so as to resolve the problem that data acquisition is not real time under Windows environment.The driver of the A/D card is implemented in RTX real time environment to configure the card registers,and the card timers are used as triggers of data acquisition.The acquired data are sent to the shared memory where it is shown in figure by the LabWindows/CVI user interface.

TMS320C2000 series DSP,which fitted control using well,has integrated AD converter.A compensating method is proposed to enhance the converting precision,by adding reference signal and programming algorithm,calibrate the existing gain error and excursion error.The material calibrating method is given,and the method is validated on F2812 DSP chip.The experiment result indicates that the method taking effect to compensate the error,enhancing the converting precision at a large extent.

Link duration is an important metrics to measure the mobility of mobile Ad Hoc network and it directly influences the performance of networks and the routing protocols.But no exact calculating method of link duration has been proposed at present.This paper proposes a calculating model which adapts to many mobile Ad Hoc network mobility models,derives the exact statistic distribution equation of link duration and some calculating equations of metrics to measure mobility(such as average link duration,path duration and link change rate),analyzes the contribution of mobility model direct metrics to the link duration.The correctness of the equation is validated by simulations using ns-2 simulator.This research provides theoretical foundations for calculating path duration,designing mobile Ad Hoc network routing protocols,measuring mobility and researching on performance of network protocols.

Redundancy technology is very important to improve the reliability and the security of system.A new method of treble-re- dundancy CCDL system is introduced.First,the system architecture and the basic principle are introduced briefly.Second,the point communication which works under the system-VxWorks is presented in detail.This treble-redundancy system can improve reliability and security effectively,the hardware system has the traits of real-time and practicality.

Ad Hoc network has become increasingly important in military and commercial applications.However, the dynamic properties of the Ad Hoc network are so complicated and troublesome that Ad Hoc network performance efficient measurement method is still dubious.In this paper, on the basis of analysis of the Ad Hoc network’s dynamic properties and traditional network measurement and Network Tomography technologies, an Ad Hoc network performance measurement architecture and some key problems are presented.

The basic principle of serial port communication between computer and microcontroller is summarized. It detailed expatiate hardware and software of PC104 and microcontroller.

Grid Computation is a distributed parallel computing system,acquired a high performance,high throughout and high efficiency computing platform by network connecting.As a large-scale grid service's important component,Grid network's monitoring and performance measurement play a major role for grid performance,load balance and task scheduling.While there are several approaches for grid monitoring,surprisingly,a very little research effort aimed at analyzing the monitored data for getting Grid Network performance measurement.On the basis of analysis of characteristic of the grid performance and the drawbacks of the GloPerf tool and the traditional network measurement technologies,this paper proposes a novel Grid Network performance measurement theory based on Network Tomography.The results of this paper present new theoretic foundations for measurement of grid network's performances.