Applied Mechanics and Materials Vols. 668-669

Abstract: It designs an image acquisition system of the camera based on FPGA. It uses a CMOS image sensor as the sensitive chip and controls the timing of image collection by designing the FPGA. FPGA transfers captured image into a PC to display. It uses the I2C bus to initiate CMOS sensor. A problem of cross-clock is solved by asynchronous FIFO. By the ping-pong operation based on two SDRAM chips to solve the problem of high speed data cache. The FPGA chip communicates signal data with PC by Ethernet port. The experiment proved that the system is able to collect 2048×1536 resolution images in a speed of 12fps.

Abstract: According to the current application of human-computer interaction interface is more and more complex requirements, implementation method of μC/GUI Chinese font based on the ARM embedded operating system with Cortex^TM-M4F kernel is designed, to download the font by PC and embedded system USB to expand FLASH memory, the μC/GUI kernel code is modified and the GB2312 Chinese characters codec driver is added, this makes up for technical blank of Chinese display in embedded system with μC/GUI library, to provide an efficient and flexible solution for no character of LCD in embedded system. The method provides a reference implementation for other LCD controllers driver and font library transplantation in μC/GUI. Experiments show that, the design method of extended Chinese font provides reference for interactive LCD driver transplantation and font realization; it has better practicability and universality in environment of μC/GUI system.

Abstract: A novel compact Ultra-Wide Band (UWB) microstrip-slotline transition utilizing high impedance chip resistor is proposed and analyzed. The reactance introduced by the microstrip open end and slotline short end, which is the main limitation to the bandwidth in the traditional structures, is minimized in the design. The model is analyzed with the method of equivalent circuits and simulated by the commercial software HFSS. To test the performance of this transition a back-to-back structure is fabricated. The measurement results show that the bandwidth of 45 octaves can be obtained while the insert loss is better than 0.7dB within the band.

Abstract: Front-Lighting system of intelligent automobile can automatically provide the shape of lighting which is needed by car in present situation. Adjust and control the shape of lighting in bend. It can take different actions and automatic adjustment to the changes of vehicle driving, according to the road condition, time interval and weather variation .and thus it can realize the control. The paper introduces the AFS system structure diagram, working principle, and working process. It plays an important role in running safety at night.

Abstract: The optical cable identification device is based on Sagnac interference principle, which is able to sense the optical phase shift.Phase modulation can improve the sensing sensitivity.In this paper,the feasibility of the piezoelectric ceramic used as phase modulator and its application in optical cable identification device have been analyzed theoretically. We have designed a PZT phase modulator by using P-5 type piezoelectric ceramic tube.Finally, the modulation principle of the PZT phase modulator has been tested by using optical cable identification device. The PZT phase modulator has a good linearity at 10KHz,the PZT phase modulator can be applied in the Sagnac optical cable identification device.

Abstract: To improve the reliability and integration of relay protection devices in power, the system on chip design for multi-principle of relay protection on FPGA is proposed. The data acquisition, digital signal processing, hardware protection algorithm, FPGA and MCU process scheduling, MCU and peripheral devices communication are designed, the hardware compilation model is set up by QuartusII on FPGA, and the simulation and experimental verification are performed. The results show that the proposed system can improve the speed of hardware protection and reduce the volume of the device, and has reconstruction on architecture.

Abstract: A new fast design method for active filter is proposed which is different from the conventional ones, as the conventional methods such as the application of manual calculation tends to be time-consuming, complex and pone to error in determination of active filter’s transfer function, also the application of table look-up can only apply to the filter of limited order less than 10. This fast method is illustrated in detail by a practical example of high pass filter. First, transfer function can be rapidly calculated in MATLAB, then the filter circuit performance simulation is presented through EDA, the results show that the proposed method enhances the efficiency of the design as it is fast, precise and direct, what’s more, the fast method is of practical guiding significance to active filter’s design, especially for high order ones.

Abstract: This paper combine Zigbee technology and RFID (Radio Frequency Identification ) technology together in order to design a controler circuit scheme that can flexible networking, RF drive, environmental parameters data acquisition, industrial control in one of WSID equipment. Described in detail the main circuit board Arduino, active RFID reader module Nrf24LE1 and CC2530 Zigbee module circuit design and the embedded software design and PC software design, the experimental results show the effectiveness of the system.

Abstract: Unmanned aerial vehicle (UAV) flight control system often needs the acquisition of sensor signal in analog form. In that case, the accuracy of the analog signal acquisition has a very important influence on the UAV flight control system. During the collection of analog signal, noise can have a negative effect on the accuracy of this collection, so we need to filter out the noise. However, some kinds of noise cannot be filtered out with hardware filters, which makes it necessary to combine oversampling technology and digital filters. In this paper, we make use of own-designed circuit to discuss some relative problems about the improvement of the analog data acquisition accuracy with oversampling technology which Verify the effectiveness of the oversampling method by comparing the traditional sampling method and the oversampling technology.

Abstract: In order to avoid the complex mathematical modeling and ensure the reliability of avionics system verification, this paper has designed an interfaces emulation and verification platform of avionics system based on QAR data. Platform includes 2 parts: Emulator and Simulator. Simulator generates the flight environmental data which is come from QAR and transforms the data into excitation signal of devices. Emulator emulates the interface features of avionic devices according to the ICD and can be replaced with real devices. By comparing the actual input-output data of devices with QAR theoretical data, this platform can evaluate the running performance of avionic systems or devices and the rationality of the ICD.