| Title |
Author |
Abstract |
| Image
Compression Technology |
ZHANG
Hai-yan,
WANG Dong-mu,
SONG
Ke-ou,
GUAN Bi-gen |
With
the development of information network and multimedia
technology, digital image, as a kind of the most important
media, is used much widely. Image compression becomes more and
more important for great deal of data. In this paper, some most
popular compression algorithms: JPEG, Fractal compression and
Wavelet compression are introduced, the advantages,
disadvantages and developments of these algorithms are
discussed, and some other compression algorithms are mentioned.
Then an algorithm is indicated that using Polar-Log coordinate
mapping as a preprocessor, which simulates the characteristic of
human visual, a higher compression rate can be obtained.
Finally, the conclusions and expectations of image compression
algorithms are given. |
| Nonlinear
Temperature Modeling and Prediction of MCFC Based on RBF Neural
Networks |
SHEN
Cheng,
CAO Guang-yi, ZHU Xin-jian |
According
to the drawback of the models existed which are too complicated,
we set up a nonlinear temperature model of MCFC using RBF neural
networks identification technology. The temperature characters
of MCFC stack are briefly analyzed. A summary of RBF neural
networks for the multi-input and multi-output (MIMO) nonlinear
system identification is discussed, and the identification
structure, algorithm and model training process are given in
detail. The validity and accuracy of modeling are tested by
simulations, and the comparison between RBF neural networks and
BP neural networks identification is given. The
simulation tests reveal the modeling method is feasible, and the
training of RBF networks is much faster than BP networks. The
modeling process avoids using complicated differential equation
groups to describe MCFC, and the input-output performance can be
quickly gotten by neuro-calculation, which makes it possible to
predict and control the temperature of MCFC online. |
| Theory
and Application of Visual Simulation Modeling for Complex
Engineering System |
ZHONG
Deng-hua, HU Cheng-shun |
Based
on the idea of gradation and modularization presented by
Zeigler, an object-oriented visual modeling method for complex
engineering system is proposed. Two gradation models are
constructed, whose understratum (CYCLONE) is encapsulated and
hidden and can be transplanted, and superstratum (CPM) is
oriented to users directly. The method is so universal that it
overcomes the complexity and speciality of the modeling for
engineering system. With the help of powerful VC++,
corresponding simulation modeling software is drawn up, whose
operation is easy and function is perfect, and it can meet
different requirement of different users. The successful
application of the software to practical engineering shows the
effectiveness of the method. |
| An
Object-oriented Development of Urban Traffic Simulation
Laboratory System |
Zou
Zhi-jun, Yang
Dong-yuan |
According
to the object-oriented software development concept, this paper
provides an entity analysis of the urban road traffic system
firstly and thereafter defines the main object classes of the
urban traffic simulation system. Furthermore, the static object
models which describe the static relation among object classes
and the dynamic object models which represent the operating
mechanism and control structure of simulation system are put
forward. Finally, based on the object modeling results, the
detailed object designs including the definition of objects’
attributes and functions are given. |
| A
Study
of
Tracking Filter Initiation Algorithm Based on 2-Step Estimation |
LIU
Gang, PAN Quan, ZHANG Hong-cai |
The
design of initial gate is a crucial problem in multi-target
track system. The ratio of measurement noise’s standard
deviations to sample period is considered for choosing the
method of filter initial in target tracking problems. Then the
prior knowledge of velocity is used for constructing a ring gate
of filter. Considering measurement noise for the ring gate, and
the character of matrix norm, a new tracking filter initial
algorithm based on 2-step estimation was developed. The
algorithm is illustrated via Monte Carlo simulation where a more
reliable confidence interval of gate is achieved over two other
algorithms. |
| Fuzzy
Neural Network-based Inverse Kinematics Problem of Robotic
Manipulators |
WANG
Hong-bin, SONG Zuo-shi,
WANG
Hong-rui |
Fuzzy
Neural Network(FNN) shows the advantages of both the Neural
Network and Fuzzy Logic, which can express the fuzzy and
quantilitive knowledge easily and has good learning capability.
A method based on FNN is firstly proposed in this paper, which
deals with the inverse kinematics problem of Robotic
manipulators. The fundamental idea of the FNN and specific
algorithm are given. The simulation results are presented for a
2-DOF rigid Robotic manipulators, which validate the
effectiveness and feasibility of the proposed scheme. |
| Simulation
Software of Control System Diagram Configuration Based on
Elements |
XUE
Fu-zhen, HOU Fei-li, LUO Chao |
This
paper introduces a simulation software of control system block
diagram configuration based on elements, including its
functions, implementation method and improved simulation
algorithm. In numerical computation, linear interpolation method
of Lagrange is introduced, which decreases greatly iteration
computation and preserves simulation accuracy with the original
algorithm. Using the visual simulation platform, user can easily
and quickly build the simulation models described by block
diagrams for linear system, nonlinear system, multivariable
system, multivariable system with smith predictor and sampling
system etc. Hence it offers a platform of simulation study in
order to analyze and design the complicated systems. This system
has the advantage of friendly interface and easy development. |
| Design
Method of Radial Basis Function Network Based on Improved Grads
and Mountain Clustering |
ZHOU
Shen, MA Zheng |
It
is proved that the three-layer artificial forward neural network
can, with a sufficient number of hidden-layer units, approximate
continuous functions to any degree of accuracy. But the key
issue is how we can construct these approximating networks and
how many hidden-layer units we need to approximate specific
functions within some specified error. To solve this problem, we
propose a improved fuzzy clustering on the basis of Radial Basis
Function Network’s structure to orient the position of
RBFN’s central points. This fuzzy clustering method constructs
density curve of the training data, sorts out the densest point
which means point posses the maximum density value one by one
from the gridding points defined through even plotting of training region. After that, we
use nonlinear least square algorithm to find a new recursive
learning algorithm which fully make use of the second order
information of the RBFN to approximate the objective functions.
This hybrid algorithm is proved effective in approximating a
mono-peak function and the peculiarity curves of different
pumping stations. We also show that the approximation rate and
accuracy can meet our desired expectation. |
| Hybrid
Flow-shop Scheduling Approach Based on Genetic Algorithm |
WANG
Wan-liang,
YAO Ming-hai,
WU
Yun-gao,
WU Qi-di |
Hybrid
flow-shop scheduling problem (HFSP) is expansion of general
flow-shop scheduling problem. It is more complex than general
flow-shop scheduling problem because there are parallel machines
on some operations. In this paper, a new method solving hybrid
flow-shop scheduling problem based on genetic algorithm is
proposed. A new coding method for the hybrid flow-shop
scheduling problem is proposed. Corresponding crossover and
mutation operators are given. These operators can easily keep
the feasibility of solution. They can also satisfy the
stochastic demand of genetic algorithm by itself. Finally, an
example of production scheduling problem for metalworking
workshop in a car engine plant is given. The results show the
effectiveness of the algorithm. |
| Design
and Simulation of Fuzzy Control Algorithm of Traffic Level of
Service |
Xu
Li-qun, Jiang Fu |
Level
of Service is basically concerned with the quality of service
provided by a roadway and it is very important to keep the
expected level of service on road with rapidly rising traffic
flow, especially under traffic congestion. A control algorithm
of signal timing at intersection of link, which can control the
traffic volumes into link by modifying the signal timing at
intersection of link, is designed for keeping the expected
traffic level of service of link by using fuzzy control theory
in this paper. Simulation analysis indicates that the fuzzy
control algorithm of signal timing of intersection can reflect
well traffic engineers’ ideas about making decisions, and it
is also proved that the signal timing must be adjusted with the
dynamic traffic volumes in order to keep the expected level of
service of link. |
| Parameter
Optimization and Simulation for Fuzzy Tree Model Based on Genetic
Algorithm |
YUE
Yu-fang, MAO Jian-qin |
Improved
from back propagation of fuzzy tree model, a kind of Takagi-Sugeno fuzzy
model, this paper proposes a new parameter optimization method
based on genetic algorithm (GA). Two keys are to select the way
of determination for parent nodes’
α
and to
select what variables as genes on chromosome. Benchmark
simulations illustrate that the method have less sensitization
for initial parameters and well evolution efficiency. On the
same precise level, new method can simplify partition of data
space and decrease computational load. |
| Fast
Track Initiation Algorithm in Clutter Environments Based on
Hough Transform and Logic |
WANG
Guo-hong,
SU Feng, MAO Shi-yi,
HE
You |
Track
initiation is the key problem of target tracking. The paper
presents a new track initiation algorithm which is based on
Hough transform (HT) and logic-based track initiator. In the new
method, HT is used first to eliminate clutters, so as to produce
a environment of low false alarm. And then tracks are initiated
by using the 3/4 logic-based method. Simulation shows that the
proposed method in this paper is effective in fast track
initiation and is superior to HT based track initiator and logic
based track initiator. |
| On
the Bussgang Class Blind Equalization Algorithms Based on
Tricepstrum Initialization |
Wang
Feng, Zhao Jun-wei
,Li Hong-sheng, Guo
Ye-cai |
The
bandwidth of the underwater communication channel is very
limited. Compared with the adaptive equalization algorithms,
blind equalization needs no training sequence, so that save lots
of band width, which makes it very suitable for the scenarios of
high data rate underwater communication and multipoint
communication. Blind equalization algorithms of Bussgang class
have the advantage of computing efficiency and disadvantages of
slow convergence rat sensitivity to initialization conditions.
Improper initialization will lead the algorithms converge to
local minimum. The polyspectra algorithms converge fast and
always converge to global minimum, but the computational
complexity made them unsuitable for hardware implementation. A
new method based on tricepstrum initialization is discussed in
this paper. According to the cepstrum –cumulant equation, the
cepstrum parameters are calculated from a data set, and the tap
weights estimated directly for the initialization of Bussgage
class algorithm. This method accelerates the convergence rate of
the Bussgang class algorithms, and ensures them converging to
global minimum. Through computer simulation of shallow water
channel equalization, the efficiency of the method is proved. |
|
Genetic
Optimization Algorithm
of Tactical Missiles Shooting
Sequence in Attacking Single Target Based on Modified Genetic
Algorithm |
WANG
Min-le,
GAO Xiao-guang |
Aiming
at the problem of optimizing tactical missiles shooting sequence
in attacking single target, the mathematical analysis of
tactical missile shooting process is given, and then a modified
Genetic Algorithm is presented through designing natural number
encoding scheme and gene exchange-based genetic operators, so
the intelligent optimization of tactical missile operational
effectiveness is realized. The experiment results show that the
new algorithm’s convergence speed and optimization effect have
advantages over the traditional algorithms. |
| Change
Simulink/Stateflow Model to HLA Federate |
TIAN
Xin-hua, FENG Run-ming,
WENG
Gan-fei, HUANG Ke-di |
This
paper presents the utility and process of changing Simulink/Stateflow
model to HLA federate, and describes the principle and method
which the transformation from Simulink/Stateflow model to HLA
federate depends on, including object-oriented encapsulation of
model, HLA-wrapper, modifying scheduler of run-time interfaces
and time management of model. At last, the paper describes SMIT
(Simulink Model Import Tool) which can automatically transform
Simulink/Stateflow model to HLA federate, including its use-case
and architecture. |
| Application
of Agent-Oriented Method in Computer
Generated Force |
WANG
Hui-xia, WANG Xing-ren |
Computer
Generated Force (CGF) is an intelligent autonomous entity; it
has the ability of sensoring, communication and collaboration.
Agent-oriented method can be used to instruct the developing of
CGF system. The main issues involved in the researching and
developing CGF system are the structure of agent; behaviors of
sensoring, cognitive and decision-making; and multi-agent
system. This paper first presents the basic concept of agent.
The characters of agent to be used in computer generated force
system are summarized. Some questions about designing and
construct CGF system are discussed. In addition, cooperation
between agents is discussed in this paper. A conceptual model of
CGF based on Agent-Oriented method is presented at the end of
the paper. |
| Simulation
for a New Real-time Ethernet MAC Protocol |
SHEN
Gang, LI Yong-nan, WEI Zhen,
XU
Xiao-ming, HE Xing, ZHANG Wei-dong |
OPNET
is a powerful general-purpose network simulator which is widely
used in protocol design, optimization and evaluation. This paper
introduces a method for modeling broadcast protocols in OPNET by
illustrating a simulation for a new real-time Ethernet MAC
protocol. The network model is composed of nodes and links. Node
models describe behaviors of nodes which are composed of
interlink modules. Module functions are described by finite
state machines (FSMs). The paper introduces how to construct
node models and link models. The detail FSM implements of the
MAC module are presented. The simulation results demonstrate
that the protocol is correct and effective. |
| Reusing
Methods in the Distributed Virtual Battlefield Simulators |
ZENG
Liang, ZHENG Yi, LI Si-kun |
This
paper describes reusing methods in the distributed virtual
battlefield simulators. First we discuss the structural module
method to design the virtual battlefield simulators, then use
class module method to discuss reusing methods in the
distributed virtual battlefield simulators. The samples
illustrate that using the methods in this paper to design
distributed virtual battlefield simulators is convenient and
reusing well. |
| Realization
and Analysis of the Air Attack Module in the Simulated
Antiaircraft Training System |
LU
Bo, HUA Zu-yao |
Limited
by
external conditions, training on the real equipment, which is
costly, can only be applied in some special ways. Nevertheless
the operation training can be fulfilled efficiently by means of
the training simulator. To present a vivid target and simulate
to electronic countermeasure which will be exist in the modern
battlefield without fail is an extremely important link in
simulated antiaircraft training. Based on the simulated army
antiaircraft training system developed at home, this paper
describes the constitution and the information exchange
mechanism of the simulated air attack module in it. Besides the
model method and realization technic of creating landform
through 3DEM, control of the aircraft’s behavior and plan of
flight course as well as the electronic countermeasure
simulation are also included. |
| Software
Design of Some Type Missile Launching Control Training
Simulating System Based on Event-oriented Simulation |
WANG
Jie, ZHANG Duo-lin, HAN Hua-ting, SHI Jian-jun |
On
the basis of analysing simulating system function and software
demand, the paper gives the software design of some type missile
launching control training simulating system which adopts the
simulation strategy of the event scheduling method, and
event-oriented simulating method and database technology. By
means of database technology, event management and save of
disposal results are accomplished, the problem that a large
number of signals bring about the complex logic construction of
the software is solved, and dynamic database solves real-time
problem of simulating system. Simulating system command, and
command event list, and fault simulating event list are formed
in main control program; and at same time, clock pushing is also
completed, input signal and output control signal are dealt with
in selecting and control program. The whole simulation process
of the launching system, and the real-time supervision and
replay of the operating process are realized. It is clear to the
software construction, and convenient to maintenance and
transplantation, running results show the event scheduling
method and event-oriented simulation model are very viable and
valid, so the method of designing simulation software can be
used in other simulating system. |
| The
Training Simulator of Container
Crane |
WANG
Chong-hua,
LIANG Gang,
LIANG
Cheng-ji |
In
this paper, the background and practical significance of
research and application of training simulator of port machinery
are presented. And based on virtual reality and program logic
control system (PLC), the new training simulator of container
crane is built up. In addition, the system structure, operation
principle and functions of the simulator are introduced. |
| A
Software Mode Based Operator Training System for Hydroelectric
Plant |
YU
Tao, BAO Jie,
DENG Qi-wei,
SHEN
Shan-de,
ZHU Shou-zhen |
The
paper presents a practical software-mode-based operator training
system for a hydroelectric plant.
The architecture of the system is briefly introduced. The
modeling and simulation of a hydroelectric plant is also
discussed. Afterward, the integrating methodology of the system
is provided in coordination with the internal software structure
of the system. The application to a hydroelectric plant in South
China demonstrates the operator training system can satisfy the
training needs. |
| Training
and Simulation System of Shipborne Crane |
Zhang
Jie, Zhang Rui, Du
Yan, Li Wen-xiu |
Based
on the synthetical study of the characteristics and work
condition of a new kind of shipborne
crane, this paper puts up with an overall structure of a
simulation and training system for the shipborne crane. And all
the component parts are simulated in a computer according to
their mathematical model. It also presents the main function and
characteristic of the simulation system. It is a necessary and
creditable simulation model not only for the building of a pure
real model but also for the further study on the characteristic
of the shipborne crane.
What’s more, this simulation system has a signality of
directing of work on the sea and training for the operators. |
| Double
Valves Compensation Feedback Control in Fin Stabilizer Load
System |
LIU
Zhuo-fu,
LI Fu-yi, PENG Xia-fu |
The
article analyses the characteristics and effects of redundant
force in general load system, and puts forward a method of
double valves compensation feedback control to depress the
redundant force by analyzing the generation mechanism of the
redundant force. Analysis and simulation results show that
double valves compensation feedback control can be effective to
compensate redundant force of load system, greatly improve the
performance of robust and trace,
and ideally depress redundant force of general load system. |
| Research
on Selection and Interaction For set of Complex 3-D Entities in
Simulation Model |
TONG
Li-li, LIU Xiao-ping |
Among
the commercial graphics packages of Computer Aided Design, there
are some limitations about display and selection of complex 3D
entities. In this paper, a new method which check relationship
between point and region is proposed. It based on and improved
on radial algorithm about scan-transition-fill in computer
graphics. Paper study interactive techniques for complex 3-D
multi-entities also. Experiment result at the end of the article
verifies the effectiveness of presented approach. |
| Virtual
Battlefield Simulation of Infrared Imaging Guiding Missile |
WANG
Xue-wei, XIONG Zhang,
SHEN
Tong-sheng, ZHOU Xiao-dong |
The
battlefield environment of the infrared imaging guiding missile
includes the target, backgrounds and interference which are
detected by the guider. A simulation method was introduced to
generate the virtual battlefield which was generated by five
interactive models: target, background, interference, sensor and
atmosphere. The targets and interference were combined into the
backgrounds by analyzing their infrared radiant characteristic
using the CIG to generate the successive infrared images. It can
achieve the arbitrary changing of the battlefield. The
battlefield adaptability of the guiding system can be evaluated
in laboratory after the guider simulation module is added in. |
| An
MPEG-4 Compliant Speech Animation System |
WANG
Xun,
ZHANG Dao-yi,
DONG Lan-fang,
CHEN Guo-liang |
Based
on the MPEG-4 compliant facial animation system we developed, an
MPEG-4 compliant speech animation system was designed and
implemented. The MPEG-4 is the first international standard at
facial animation. In this paper, we give the definition of the
standard and the structure of our MPEG-4 compliant speech
animation system and then, describe in detail the key techniques
in implementation, including facial animation, the definition of
Chinese viseme, viseme transmission, expression transmission,
viseme and expression blending, and speech-animation
synchronization. Because the computing method is simple and the
communication cost is small, the system can produce high-quality
speech animation with expression in an ordinary microcomputer |
| Dynamic
Scheduling of Batch Processes Based on Simulation of Petri Nets |
LI
Hui-fang, FAN Yu-shun |
Batch
processes usually exist in a dynamic and complex environment.
The objective or subjective disturbance, as well as inherent
process changeability, will lead to the changing of various
process parameters, such as the perturbation of processing
times, the changing of raw material quality, etc. These changes
may make the existing static scheduling lose its optimality and
even become unfeasible. So, it is required to consider dynamic
scheduling with quick responsivity to unexpected events so as to
catch the real time changes in production environment. For
the deviations of
processing times more often occurring in batch processes, a
dynamic rescheduling method is put forward in this paper by
integrating with rule-based schedule and Petri net simulation.
This method can effectively catch the deviations of processing
times and then improve the scheduling performance. It indicates
a new direction for the research in dynamic scheduling of batch
processes. Some simulation examples are demonstrated for this
method. |
| ColuSimu:
A Simulation Software for the Research of Model Reduction and
Control of Distillation Columns |
WANG
Wei-bo, LI Shu-rong |
ColuSimu
is an integrated visual simulation software for the research of
model reduction and control of distillation columns, which is
developed by us on the basis of theoretical results in this
area. It contains simulation modules for the research of model
reduction, control structures, nonlinear control based on
full-order model and nonlinear control based on reduced-order
model. It is easy to perform various simulation studies on
distillation columns by the software. |
| Chebyshev
Fit of Propeller Properties across Four Quadrants and
Realization of All-round Movement Simulation along X-shift of
DSV |
LI
Dian-pu, WANG Zong-yi, CHI Hai-hong |
A
Chebyshev fit expression across four quadrants for a propeller
in Deep Submergence Vehicle is given concretely and is changed
to ordinary polynomial expression. The dynamic simulation models
of propeller corresponding four quadrant work are given.
Therefore, it becomes practical to express static and dynamic
properties of shift load of the DSV propulsive motor. On this
basis, the dynamic propulsive models of DSV across four
quadrants are set. The simulations show the results are very
close to the practical test data and the correctness and
effectiveness of above results are proved. |
| Run
Simulation of Self-mechanized Gun Using Adams Tracked Vehicle |
MA
Ji-sheng, YAN Shi |
In
this paper, a dynamic model of a self-mechanized gun is created
by adding rotating gun turret, cradle assembly and recoil gun
barrel to the tank model in ATV. There are 2 track systems in
this model and each track system is constituted of 1 idler, 6
roadwheels, 1 sprocket, 3 support rolls and 84 segments. The
whole model has 1051 freedom degrees. The forces acting on the
idler, roadwheels, sprocket, support rolls and segments are
discussed in detail. 4 simulations are implemented under the
following conditions: (1) setting the same rotation speed for
the 2 sprockets, letting the gun cross an obstacle.
(2) setting the same drive torque for the 2 sprockets,
letting the gun run on a plain road. (3) setting drive torque
for one sprocket and 0 for another sprocket, letting the gun
turn on a plain road. (4) setting drive torque for the two
sprockets with the same amount and different sign, letting the
gun turn on a plain road. Based on the above analysis, the
capability of the gun can be judged quantificationally. |
| Integrated
Control Simulation for Power System with Superconducting
Magnetic Energy Storage |
GE
You, LI Chun-wen |
For
single machine infinite bus power system with superconducting
magnetic energy storage (SMES), this paper constructs
differential algebraic equations (DAE) system model on the
Simulink platform of Matlab. Combined inverse system method and
small signal model of a SMES unit, SMES integrated controller is
designed. The Simulink platform-based simulations under two
conditions show that proposed controller can improve power
system transient performance effectively. |
| An
Approach to Multitask Scheduling for Underwater Vehicle Guidance
Simulation System |
LIU
Wei-dong, GAO Li-e, XU De-min,
SHENG
Meng, KONG Feng |
A
new approach is introduced for simulation of underwater
vehicles. The dynamic model, control and guidance equations of
the underwater vehicles are discussed, and the P/T model for
this multitask system is described in details. In order to make
the multitask scheduling be realized by system management
scheduler of the Operating System, modified solutions for join
and fork models are presented. Finally, some simulation results
are given to demonstrate the validity of the proposed methods. |
| Computer
Simulation of A Complex Crank Rocker Arm Mechanism Moving |
Shao
Lu-Shou, Jiao Jun |
Due
to complex mechanical motion of the crank rocker arm of rice
transplanter, we depend on miscellaneous math inference in
teaching, which is insipid and indirect. With variation of
parameters and motion rod, its motion is volatile. Through
simulink, we establish mathematical modeling and carry out
simulation, output graphs of motion locus,transplant rice
seedlings' velocity and acceleration. At the same time we
simulate results of mechanical optimum design and provide their
graphs. These
simulation results, videotape of static and dynamic state of
crank rocker arm mechanism and practice in farmland have been
used in multi-media teaching and receive good effect. |
| Design
and Study of Observer for Linear Systems with Unknown Input |
YAN
Wei-dong,
LU Tian-sheng,
YU-Yan |
For
a class of linear systems with unknown input, this paper
develops a new observer of state /unknown input and its existing
condition. The strict verification to the observer is given.
Through a example of linear system, using the proposed method,
the observer of the linear system is designed. The simulation
result shows that this kind of observer using only measured
output, can asymptotically estimate the system’s state and
unknown input to any desired accuracy. |
| Design
of Discrete Fuzzy System Using New Fuzzy Controller and Observer |
WU
Zhong-qiang, GAO Mei-jing |
Based
on T-S fuzzy dynamitic model, the design analysis for discrete
system using linear supervise controller in state space
framework, has been studied. The global fuzzy model has been
newly divided into some subspace by membership. Using subsection
Lyapunov function method, the defect of solving a common
positive matrix P in formerly is overcome and the Riccati
equation in trouble needs not to be solved. The fuzzy observer
is designed for system in which has immeasurable state variable
in general. It is completed by using mature linear system theory
to control complex nonlinear system. The fuzzy controller and
observer are simple, and suit for engineering use. |
| A
Low Probability of Intercept Direct Sequence
Spread Spectrum Systems |
LUO
Wei-bing, WANG Yong-sheng |
Some
special detector, such as square detector and bit delay
detector, can easily detect traditional Binary
Phase-Shift-Keying (BPSK) modulation signal of direct sequence
spread spectrum (DSSS) systems, which was a dormant disadvantage
of carry-wave hiding. A new modulation can improve the
performance of low probability of intercept (LPI) for DSSS
systems by a multi-level pseudo-noise (PN) code. Performance of
LPI in the new way has been simulated by SystemView software and
compared the result with the traditional BPSK modulation. As
result, the modulation can effectually avoid the detection by
square detector and bit delay detector. |
| Fuzzy
Control System Design of Multi-phase Traffic Signals in Isolated
Intersection |
CHEN
Shu-yan, CHEN
Sen-fa, HUANG Yi |
It
is not necessary
for
fuzzy control
to
built exact
mathematic model about the controlled object, so fuzzy control is applicable
especially
to control urban traffic with great random
characteristic.
Having
the
problems of multi-phase and time backwards be
considered,
the traffic
signal control employing fuzzy
control method in isolated
intersection is discussed, and a fuzzy control
method is proposed which uses current phase and next
phase vehicles waiting queue to determine each phase time. With
the emphasis on design of the two-dimensional fuzzy controller,
the fuzzy control system
design scheme is given. Watch
Dog in Mcs96 is exploited to ensure the system stability and to
raise resisting interference capability of the system. Because each
phase time is determined once according to the result of fuzzy
inference about real time data of crossing, this system can be
used at intersection with time
backwards
equipment, and it has favorable practicability. |
| A
New Approach to the Sliding Mode Control Based on Fuzzy Reaching
Law |
JIANG
Kun, ZHANG Jing-gang |
A
scheme of the sliding mode control based on fuzzy reaching law
for a class of nonlinear systems with uncertainties is proposed
in this paper. Since the proper fuzzy logic control is applied
to the reaching law, the quality is improved. At the same time,
the chatting phenomenon is avoided. Simulation results show that
the control system exhibits not only strong robustness and
better quality control but also avoiding the chatting
phenomenon. |
| Improved
Adaptive Generalized Predictive Poleplacement Weighted
Controller |
CHEN
Li-zhi, CAI Qing-sheng, FANG Jin, ZHANG Quan |
An
important problem worthy of being noticed is how to decrease
calculative quantity and ensure real-time problems while the
application of predictive control. The generalized predictive
poleplacement weighted controller of the literature has been
improved in this aspect, but it is still required to solve
closed loop pole equations on-line, and the calculative quantity
is still large. In this paper, a new scheme is proposed, which
uses recursive algorithm with small calculative quantity to
identify parameters of above-said equations, and at the same
time, the recursive algorithm about Diophantine equations of
literatures is popularized. The application indicates the
validity of the scheme. |
