Chun Yang Wang

Fuzzy Fractional Order Proportional Integral Controllers for UAV Lateral Attitude Control System

This article is based on the theory of fractional calculus control, and put forward a kind of fractional order PI controller design method for lateral attitude control system of unmanned aerial vehicle (UAV) model. And the unit step response of the control system is analyzed in the simulation to improve the UAV flight control system stability and robustness. Use the controller parameter tuning method and combined with fuzzy reasoning to design IOPID controller, FOPI controller and fuzzy fractional order PI controller. Then, by exploiting Matlab, the frequency domain response and unit step response characteristics of the different control systems can be plotted. The results verified that the designed fuzzy fractional order controller for the attitude control system is effective.

Robust Fractional Order Proportional Integral Control for Large Time-Delay System

In this paper, a new control method for large time delay system is proposed. Firstly, the decreasing time delay controller is used to remodel large delay time plant into small delay time plant. Then, a fractional robust proportional-integral controller (FOPI) is designed, using the phase margin and cut-off frequency at a specified point in the Bode plot of flat robust conditions, to guarantee the desired control performance and the robustness of the high order system to the gain order system. For comparison between the fractional order proportional integral controller and the traditional integer order PID (IOPID) controller, the IOPID controller is also designed following the same proposed tuning specifications. The simulation results indicates that the both designed controllers work efficiently. Furthermore, the FOPI controller makes the large time-delay system get better control effect, the system has high robustness, adaptive ability and anti-jamming ability.

A New Method of Doppler frequency and DOA Estimation Based on Gradient-time-delay

This paper proposes that arrays of spatio-temporal data matrix was constructed by the arrays of the received signal delayed in time gradient, Meanwhile, applying the method of ESPIRT to get the twiddle factor of the received signal array element and the array element of the time and the space, finally get the final information of Doppler frequency and the information of arrival angle though applying least squares method.

Design of Zigbee Wireless Transmitter Based on C8051F350

The wire transmissions are commonly used in traditional industrial transmitters, but it has the problems like wiring complexity and inconvenience of installation. The design of zigbee wireless transmitter based on C8051F350 is proposed in this paper, which introduced hardware and software, meanwhile, plenty of experiments have been put forward to test it. The result of these experiments shows that it has the features of low power consumption, flexible networking and scalability. This design solves the problem of field wiring, and it has the advantages of lower cost, easy field-installation and operability.

The Design of Image Acquisition System Based on CMOS Image Sensor USB Interface

The system selected OmniVisiON companys CMOS chip OV7620, it is an integrated color camera chip, a 640 × 480 (300,000 pixels) image matrix. Considered that the CPLD control system is similar to the DMA mode of data transmission; Cypresss USB 2.0 chip is used by CY7C68013 chip. Finally, it is become the microcontroller firmware and device driver. The paper presents the design of Image acquisition system based on CMOS image sensor USB interface. Design an image acquisition and transmission system, and describes its firmware as well as the development of USB device drivers and PC-side application .

A Method for Designing Low Peak to Average Power Cognitive Radar Waveform

In this paper, the basis function of TDCS system (Transform Domain Communication System) is used to design cognitive radar transmitter waveform. Based on the noise environment, the waveform can be adjusted adaptively. Then after clipping to reduce the PAPR (Peak to Average Power Ratio) of radar echo signal, the obtained signal is used as the next launch of the radar signal. The cognitive radar transmitter requires a nonlinear waveform to improve the efficiency of radar transmitter power amplifier, so reducing the PAPR of signal is essential. This paper presents the gray complementary sequence is applied to TDCS communication systems, and then it needs to reduce PAPR of signals by clipping. Proven, PAPR of the transmitted signal is maintained at about 3.25dB, and the signal has a low probability of intercept, high anti-interference ability and distant target detection range.

Refined Optimization Analysis of 2G/3G Mode Switching

With the continuous development of the 3rd generation telecommunication, the requirement of fluent switching is taken more consideration. The paper presents the relevant parameters and the implication of 2G/3G mode switching in CS domain. Proposes the optimization analysis of the basic principle of 2G/3G mode switching in CS domain, suggests a method using neighboring CIO to refine the origin switching methods, with the analysis of typical case by using the specific implementation process of neighboring CIO, the refined method proved to be of actual value and high efficient

Boiler Make-up Water Treatment System Based on KingSCADA

The technique process of boiler make-up water treatment is introduced briefly in the article. Combining with the practical production, a system based on KingSCADA and PLC is designed for the treatment of boiler make-up water. The traditional water treatment system is optimized. The modularization of the software design of the system disposition configuration, control points configuration, reports and trend curve and etc. were realized.

The Influence of On-off Shift Solenoid Valve's Design Parameters on Electromagnetic Force

The integrated transmission device of tank and armored vehicles is controlled by the electro-hydraulic control device, and the On-off shift solenoid valve is just the key component in it. As to models of different air gaps and voltages, through the magnetic circuit partitioning method and the finite element method, the relationship between design parameters and the electromagnetic force is got, and the reference ranges of voltage and gaps for steady electromagnetic force are also obtained from the results, which supply the theoretical basis for the design of structure of the solenoid valve.

Arbitrary Integer Frequency Divider Based on Single Chip Microcomputer

Arbitrary integer frequency divider based on single chip microcomputer proposed an arbitrary integer frequency divider design scheme within 100 for digital clock signals. Microcontroller detected the parity of the points frequency which was inputted by the external keyboard, and then controlled the switching controller switched the point frequency circuit between odd points frequency circuit and even. Therefore, a circuit design could solve problem along with the changing of the circuit and the heavy labor for changing the frequency num that existed in traditional divider .So it greatly reduced the cost.