Abstract:The control method of gridconnected operation is one of most important issues for ensuring the system reliable operation. First, the mathematical model of wind turbine and Liion battery is built, and the mathematical model of girdside converter and machineside converter are given under two phase synchronized rotation reference frame. The control methods of wind generation system and battery storage inverter are analyzed in detail. Finally, the effectiveness of proposed method is verified by simulation results.

Abstract:To control the location and direction of simulated sunlight, a control system for moving solar simulator is designed and tested. The digital input and output card + driver structure is used in the system. It’s controlled by computer through programming to control the status of xenon lamp power, speed and direction of the step motor. And remote control is completed based on UDP protocol. The experiment results show that the control system is reliable, and the accuracy of translational motion and vertical motion is better than 0.3 mm, the accuracy of azimuth motion and pitch motion is better than 5′, which can meet the anticipative requirements of solar simulator experiment system.

Abstract:An important aspect of the impact identification is the impact location identification. Accurately identify the impact location will help to determine the possible location of the damage, and accelerate the detection of the critical parts of the structure. Although there are someexisting recognition technologies, they either need a lot of training data, or require a lot of calculation and sensitive to boundary conditions. Establishing the relationship between impact force and impulse response, the present paper obtain the relation between the piezoelectric signal and energy flow (Poynting vector). Based on the important information of energy, impact location and their energy can be obtained. Finally, the simulation results confirm the effectiveness to the proposed method. This is a simple, computationally efficient method giving a solution to the bending wave propagation at any point of the structure whatever the location and waveform of the input force.

Abstract:According to the IEC600448 standard definition of merging unit, starting from the function of the merging unit, using the software of MATLAB to receive simulation of multi fault information of field power system, and sending the merging unit with FT3 frame format through the Ethernet, processing the received data with the merging unit with FPGA as hardware core, finally the data is sent to the two side of the device to receive the data realtime display through the Ethernet. The study based on the experimental platform, mainly described the structure and function of each module, including the MATLAB transmission module, FPGA receiving and optical fiber sending module and Manchester coding and decoding and data display module. The hardware platform is built and the test result of the software is given.

Abstract:As high temperature and high pressure environment both have a very important influence on production logging instrument performance, especially the temperature. The moisture content meter is the core of the coaxial phase method for water detection instrument. The research of the heatresistant circuit has a very important significance for the whole instrument. The phase discriminator is an important part , and it is composed of LM139 voltage comparator and D trigger,they are designed and optimized based on the principal of the moisture content. The circuit is realized by PCB method.Through the temperature experiment has reached the requirement of 140℃, and it improved the instrumet temperatureresistant level.

Abstract:When the small hydropower stations are linked with the power system, it becomes difficult to judge the type of the fault which causes the running of the hydropower station unsteadily. If the fault takes place in the distribution line which links to the hydropower stations, the reclosing always fails. In order to solve this problem, adopt nonvoltage to reclose and improve the traditional reclosing control logic. A new reclosing relay device based on programmable logic controller is designed to resolve the problem of the compatibility with the other relaying actions and to improve the success rate of reclosing. The simulation running of the device in Guangdong Province proves its effectiveness, the time setting and control strategy of the reclosing device has a certain significance for engineering applications.

Abstract:ST injury vector displayed in the compass was proposed to visualize the location and extent of myocardial ischemia. Analysis of ST deviations from the standard 12lead ECG allows for estimation a ST injury vector. The direction of this vector can be used to localize ischemia and the magnitude of the vector correlated with the extent of ischemia. Thirtytwo patients with myocardial ischemia were detected by the ST injury vector method. The result was compared with electrocardiogram, Kappa value was 0.903 6, sensitivity 96.2%, specificity 100% and accuracy 96.9%, positive rate of 81.3%,P>0.1; And compared with the coronary angiography, Kappa value was 0.7949, sensitivity 96.2%, specificity 83.3% and accuracy 93.8%, positive rate of 81.2%, P>0.1. It proved that there are high consistency and no significant difference between ST injury vector and electrocardiography and coronary angiography, and the accuracy is high. ST injury vector is valuable in the field of myocardial ischemia.

Abstract:In the velocity measurement of the spinning flying target, the receiving signal would be modulated by the microDoppler caused by the spinning of target, which would effects the measurement of motion parameter. The microDoppler with a property of time varying would different effects on the measurement of motion parameter under different conditions. In this paper the microDoppler model of cooperative spinning target is deduced with the operating mode of transponder. And the theoretical model of receiving signal is derived based on the microDoppler model. Then we have verified the microDoppler modulation and the effect of the frequency spectrum, and validated the correctness of the model through the simulation. At last the measurement interval applied to the measurement of different motion parameter is concluded by the analysis of the simulation.

Abstract:A FPGA based NAND Flash bad block management scheme is presented, on the basis of common bad block management of the nonvolatile NAND Flash memory. The scheme uses bad block replacement strategy to divide all blocks into Data block area and Good block reserved area. The bad block identification and replacement is realized through the establishment of indexbased bad block marking tables BBT (bad block table) and the bad block map RTT (reserved translate table). At the same time, the two tables are saved in the NAND Flash to guarantee the nonvolatile storage of bad block information and the highspeed performance query of bad blocks. Taking into account the bad block emerging, bad block identification, bad block information storage and highspeed replacement of bad block, this scheme is the complete solution for bad block management. Experiments showed that this strategy has the advantages of small bad block information capacity, fast replacement and high reliability.

Abstract:In order to overcome image shakes in the video of the camera mounted on the aerial platform, an improved feature estimation was proposed to remove effectively the inter frame jitter of the video sequences and to realize the electronic image stability. An algorithm combining scalespace FAST corner detector and improved SURF descriptor , is proposed in this paper. The video rotation is removed ,and the stable feature points of neighbor frames was extracted and the estimation of inter frame motion vectors was implemented. RANSAC was employed to solve the global motion vectors. Quadratic interpolation algorithm is adopted to get the stable video. The experimental result indicates that the PSNR of video sequence has improved about 5 db, which verifies that the proposed stabilized algorithm removes interframe jitter under complicated movement ,higher accuracy and stronger robustness.

Abstract:With the development of synthetic aperture radar realtime imaging system, more and more SAR imaging systems are based on FPGA. The transposition of image matrix data is one of the essential procedure of SAR imaging system, and its efficiency has been restricted the SAR realtime imaging system. This paper proposes a fast inplace matrix transposition algorithm based on FPGA. Firstly, matrix is segmented into submatrices of the same size. Secondly, an address sequence table which indicates submatrix address in pre and post transposition is calculated by computer in advance. Lastly, according to the address sequence table, submatrices are transposed on FPGA. The result of analysis and simulation shows that this algorithm occupies an extra 2% time span and 0.2% matrix space. This algorithm improves the efficiency of matrix transposition, reduces the burden of storage, which is important to the SAR realtime imaging system.

Abstract:Focused on trace gas detection technology based on cavity ring down spectroscopy in the DFB laser wavelength stability requirements,taking EPM1654 laser module for example, the unbalanced bridge circuit for temperature measurement based on NTC thermistors is deeply analyzed. The guantitative analysis and weights comparison of the temperature measurement error caused by a variety of factors, which include the nominal value of the error and drift of passive resistance of the device,the active operational amplifier offset voltage and drift,noise and quantization error of the AD converter,thermistor resistancetemperature nonlinear fitting,shows that the nominal value of the reference resistor error and drift is the primary factor affecting temperature measurement accuracy. By the comprision of temperature measurement accuracy of differernt bridge reference resistior,we find that within the ambient temperature, the NTC thermistor which has the similar resistance to the reference resistarce helps to reduce measurement error.

Abstract:In order to extract the information in the complex image of the visual prosthesis more accurate, a new focus subimage extraction method based the visual saliency and new edge detection algorithm fusing multiscale information of image edge strength are proposed. Firstly, it uses the GB method to calculate the image saliency map, and applying the double thresholding on the saliency map, the initial segmentation is modified by the morphology processing and the focus subimage is obtained finally. Secondly, considering the deficiencies of traditional single scale edge detection, the edge detection based on the fusion information of the mutiscale Sobel operators is proposed. The proposed complex image processing strategy not only simplifies the complexity of the encoding image information, but also improves the noise robustness of edge extraction algorithm.

Abstract:Over the past few decades, a variety of image annotation algorithms have been proposed. These methods either require a large amount of computation, or effect of labeling is not satisfactory. In this paper, an automatic image semantic annotation method based on novel Gauss mixture model with heterogeneous descriptors is proposed. The Gauss mixture model is built by the heterogeneous space,which is different from the others’. Specifically, each annotation word was described by the Gauss model at a plurality of feature space respectively, and formed “annotation word subdescriptor”corresponding to the subspace. Because the ability of each subdescriptor describing the different words is different, the machine learning method is used to integrate these subdescriptors to form a more effective “annotation word descriptor” for improving the accuracy of annotation. The proposed “annotation word descriptor” can effectively establish the relations between the image semantic concepts and visual features, and accurately describe the semantic content annotation, thereby improve the performance of image annotation. The experimental results confirm that the proposed method is effectiveness.

Abstract:In the system of space camera using CCD as the sensor, the matching design of signal processing circuit with the CCD sensor is crucial, and the performance of whole space camera is determined, so the matching analysis should be done after the design of CCD signal processing circuit is finished. Firstly, the typical structure of CCD signal processing circuit in space camera is introduced; then, the analyzing method of matching is proposed based on dynamic range; finally, this method is used in one space camera project and found some not suitable design in the circuit, the basis and suggestion of optimization in circuit design is provided.

Abstract:The typical characteristics of small unmanned helicopter are unstable, strong coupling and difficult controlling. In this paper, we designed and implemented a stability augmentation control system based on SelfAdaptive Fuzzy PID. First, a control principle of small unmanned helicopter was analyzed in theory and a stability augmentation control law was designed, which based on SelfAdaptive Fuzzy PID control methods. Second, the hardware based on DSP and software of the control system were completed and applied. Finally, during lots of experiments, we tested the feasibility and validity of the system. The results showed that the dynamic stability of small unmanned helicopter could be improved through the stability augmentation control system. In addition, the system could run stably and had high reliability.

Abstract:PID algorithm is one of the most classical algorithms in industrial control, and its branches include the location PID, incremental PID and PID based on neural network and genetic algorithm. Aiming at the problem that the influence of various kinds of interference by the work site in actual application makes the differential item very sensitive to data error and interference, four sampling center method is proposed for the error optimization to reduce the sensitivity of the system to interference, and is realized by C language code. Finally, the condusion is reached by analysis using LabVIEW that four samples centers algorithm can effectively reduce the interference of the second order differential item to the PID system，and reduce the impact of system malfunction and ensure system stability, especially in the switching of automatic control to manual control,which can be done seamlessly.

Abstract:Magnetic resonance coupling wireless power transmission technology enables power transmission by highfrequency magnetic resonance coupling efficiently and in long distance. Mutual coupling coefficient between coils transceiver affects the transmission efficiency and the transmission distance of the system directly. Space field strength synchronous detection is the most direct way to accurately analyze mutual coupling coefficient. In this paper, a spatial distribution of the magnetic field detection system has been designed based on Visual Instrument. The design of a digitized magnetic field sensor based on Faraday's law of electromagnetic induction has been introduced in detail, as well as the design of a sensor array, the communication protocol between the upper computer and the lower computer ,and the software for the upper computer.The experimental results showed that the detection system has more than 10 MHz bandwidth. The sensitivity of the magnetic field sensor is 530 V/T probably. What’ more, the system has the function of multipoint synchronous acquisition. The platform can satisfy the requirements for magnetic field detection in magnetic resonance coupling wireless power transmission system.

Abstract:After various reliability tests, the parameters of the mixer conversion loss is an important indicator of device performance. Based on the two fregueney conversion loss measuring method,which are spectrum analyzer method and vector network analyzer method,this paper analyzed the three main sources of the error of fregueney conrersion loss. Through the measured data of the two tests methods,the influence of the three kinds of error to the two methods and the corresponding error elimination technigue are analyzed,and the results show that the spectrum analyzer method has the characteristic of low instrument cost,simple operation,but more sources of error and less test stability,while the vector network analyzer method has the advantages of high stability and reliability,stable and accurate test data throughout the entire test band.

Abstract:By means of FT245BL,this paper achieves multipoint data acquisition on RS485 fieldbus through using notebook PC by Universal Serial Bus and using waveform graph directly express realtime processing data to analysis easily by hostcomputer writing with MFC. Detail the composition of the various parts of the system，including hardware circuit and hostcomputer software design. Then through collecting the data of development boards on both nodes on the RS485 fieldbus to simulate the sensor on RS485 fieldbus and show the waveform by hostcomputer .Finally,checking the feasibility of the system successfully.

Abstract:Mini IMU owns threeaxis gyroscope and triaxial accelerometer, so the robot posture can be displayed with it put in the robot. When crawlertype robot searches and rescues after catastrophe, the posture is vital to the unfamiliar topography. To solving this problem, we connect Mini IMU with main control circuit board,and the posture data within μC/OSII operation system of Freescale singlechip are sent to control box. The control box translate the data after receive them. Finally the robot posture can be displayed by OpenGL technology on the screen of the control box. When the design is completed, the robot was controlled to rotate, climb, and comparing the data received in the upper computer. The result of experiment is analyzed and assessed according to the error analysis. The system is timely, accurate and reliable.

Abstract:The robot application is a research hotspot, and the biped walking robot is a kind of bionic type robot, which can realize the walking，gait control and other related actions. In the paper, a biped race walking robot is designed through the technology of microcochip control and motor driven, and the hardware structure and program are given. The experimental results indicate that this design of biped walking robot can meet the design expectations and requirements. Through the 3 years of practice and expansion application , the designed biped robot has better stability, faster working speed, and the robot also has more simple structure and lower cost, which has extended certain application value and significance.

Abstract:With the development of society and the continuous improvement of living standards, people pay more attention to their own health problems. However, the traditional health monitoring equipment lack of effective health management capabilities.In this respect, this paper describes the hardware and software design of a portable health monitor in which a 32bit lowpower processor which based on CortexM4 kernel was used as the control core and the RTThread realtime operating system as the software platform. Functions such as heart rate measurement, the forehead temperature measurement, step count and energy consumption monitoring,health task management can be realized through the system. Then through the closedloop management mode of health checkintervention program’s generationintervention programs execution monitoringintervention assessment (health rechecking) to improve and promote health constantly.

Abstract:Acoustic communication in pipeline has certain application value in some special occasions. This paper presents the design and implementation of acoustic communication system in pipeline, which is intelligent, fast, and lowpower consumption. System design includes two parts, hardware design and software design.The system uses an ARM processor to code signal by mixing sounds of different frequencies and to decode mixing signals by FFT and peak detection. Experimental results show that the system can achieve rapid and reliable acoustic communication in pipeline.

Abstract:Aiming at the common detection problems of residual chlorine in water, the working principles and manufacturing method of residual chlorine sensor based on threeelectrode system have been introduced and studied, and this paper also proposed the design of online measurement instrument for residual chlorine. Based on Reference Electrode which has the ability of feedback control to make Working Electrode potential be stable and Counter Electrode made of spiralshaped silver wire, the newstyle trielectrode electrochemical sensor has better performance in wide measuring range and chemical reaction than bielectrode sensor. Experimental test result indicates that the online measurement system using residual chlorine sensor with three electrodes has stable performance in the 0~10 mg/L measurement and its linearity error is ±20.77 μg/L, which can be used for the online detection of free chlorine in drinking water，boiler feed water and sewage treatment.

Abstract:Turbine flowmeter is widely used in process measurement and control instrument. However, turbine flowmeter is susceptible to interference caused by fluid viscosity, and the measurement precision in practical applications cannot be ensured and the turndown ratio is limited. Aiming at the nonlinear characteristic of the turbineshedding sensor, a realtime digital signal processing system was developed based on MSP430, and the system obviously implements the nonlinear correction to vortex senor by storing the datas processed with linear interpolation of the sensor in the Erasable Programmable Read Only Memory. Meanwhile, the flowmeter also has a 4~20mA current output , frequency output and RS485 communication function which make it compatible with industrial instrumentation.

Abstract:Space optical facility is an important application of space technology. This paper investigates the attitude determination of a large space optical facility. It is assumed that the optical facility is installed on a space station and is controlled by the space manipulator. The precision of the attitude determination is important for the performance of the optical facility. The space manipulator’s coordinate system is presented, the attitude determination scheme of combination of the space manipulator, star sensors and optical fiber gyro is developed, the federal filtering algorithm is adopted, which effectively improve the precision of space optical facility’s attitude determination.

Abstract:This paper introduced the design principle and realization method of a kind of high precision optical power meter based on STM32, and gave its data processing and correction method. The optical power meter used STM32 as microcontroller, with the use of an InGaAsPIN photodetector to realize photoelectric conversion, and by the use of a lownoise photoelectric amplifier AD795 and highspeed multichannel analog switch to build circuit to achieve automatic range switching control in the measurement range of optical power, it can not only eliminated the nonlinear error of measurement, but also can improved the measurement dynamic range and accuracy. At the same time, use a 24bit ADS1232 ADC to achieve high measurement resolution, and with the help of data processing and modified technology to further improve the measurement accuracy, decrease the measuring error. The actual test results showed: the optical power meter has the advantages of low cost, high precision and reliable performance, can meet the demand of optical power test in engineering application.

Abstract:This paper introduces the method of network signal routing in printed circuit board (PCB) for Cat 6. The bandwidth in Cat 6 reaches 250 MHz, which is 1.5 times higher than Cat 5, so the problem of crosstalk is more serious. This design utilize interdigital capacitors which are widely used in microwave and radiofrequency field to successfully solve the problem of crosstalk, and this paper proposes a new method of designing interdigital capacitors in PCBs. Meanwhile, solid capacitors are not used in the design that it can reduce the cost of PCB effectively. Finally, the design is simulated by 3D highfrequency electromagnetic simulation software CST, which improves the efficiency and precision of the design.

Abstract:As a new method for radar target feature extraction and recognition, microDoppler effect can express more kinematic information of moving targets. However, microDoppler will result in defocusing and other disadvantageous effect on SAR imagery, which can’t be overcome by conventional methods. Through the research of the vibration and rotation of SAR target echo model, SAR micromotion unified target distance equation and SAR echo are summarized in this paper, and azimuth will present Sinusoidal Frequency Modulation (SFM) characteristics of periodic signal. At last, simulation results on point targets validate the proposed approach.

Abstract:In this paper, we analyzed the effects of carrier frequency offset for Weighted fractional Fourier transform (WFRFT) system under the time frequency fading channel. The expression of signaltointerference ratio (SIR) due to intercarrier interference (ICI) and intersymbol interference (ISI) is derived and the bit error rate (BER) performance of the BPSK modulation scheme are simulated for singlecarrier (SC), OFDM and WFRFTOFDM systems respectively. Simulation results show that when carrier offset exists, the WFRFT system has superiority over both SC and OFDM systems after choosing an optimal fractional order by experiment.

Abstract:In this paper, we investigate the effect of modulation rate on the energy efficiency (EE) of a twohop communication system with the assistance of a halfduplex decodeandforward (DF) relay, considering the given bit error rate (BER) and using MQAM modulation. First, we formulate the model of optimum transmission power, subject to the given BER. Then the minimized transmission power under the constraint of the given BER is obtained. For EE problem, the circuit power consumption of devices can not be ignored, so with the circuit power consumption considered, we derive and analyze the expression of EE based on the modulation rate. According to convex optimization theory, the fact that EE is a quasiconcave function of modulation rate has been proven. We find that when the modulation rate increases, the EE will first increases and then decreases. Finally, the theoretical analysis is corroborated by simulation results. We also show that the location of relay node has effect on EE.