Abstract:In order to resolve the moment disturbance to the fast response of tracking moving targets of the stabilized platforms, 2DOF robustness internal model controller is designed with the part disturbance observer on the foundation of the robustness IMC. First, based on robustness IMC, improve on the system with the part disturbance observer. Following, introducing the controller with no contacting to the error while combining 2DOF controller, to make the disturbance rejected ability and tracking ability apart. At the precondition of assuring the systemic robustness, improve the antidisturbance ability and tracking ability. Ultimately, some simulations and experiments were carried out. While outside frame of the platforms was no movement, inside frame of the platforms does sinusoidal movement with the 0.5 Hz, 1°/s, the 2DOF internal model controller overcome the effect of the friction moment, make the system having better inputrespond characteristic; while outside frame of the platforms does sinusoidal movement with the 1Hz, 6°/s to make the disturbance of the velocity, the stabilization precision of platform is increased from 0.03° to 0.004°.The method is testified to improve the antidisturbance ability when assure the good inputrespond characteristic.

Abstract:In order to ensure the safe operation of power grid, external power supply reliability and the various types of electrical work in an orderly manner, it is necessary to monitor the various parameters of transmission line realtime. This paper introduces a wireless monitoring system of high accuracy threephase electric energy measurement based on chip ATT7022C, using STC90C58AD as CPU, communicating with kingview monitoring interface by CC2530 ZigBee wireless network. That can real time monitor the current, voltage power, and other electric parameters in transmission line and make corresponding treatment such as reactive power compensation or disconnect the transmission lines. The intelligent monitoring system is integration of the measurement and control technology, wireless communication technology and modern electronic technology. It has good realtime performance, low power consumption, high accuracy and other characteristics. It can meet the eletric power system for monitoring the power parameter.

Abstract:With the development of information society, the demand for locationbased services becomes outstanding. With the analysis and comparison of different indoor and outdoor positioning technology, a system combining locationbased Beidou, communication and timing of the three functions and RFID indoor positioning technology is designed. The system is the integrated use of the Beidou satellite system, sensor technology, wireless communication technology, data mining and processing technology. The system uses a joint approach of the Beidou satellite systems and RFID technology to obtain location information and time information. The system mainly consists of two parts, the systemside service platform and the implementation of positioning and multimode communication client. The System uses the client to collect position, time information and their own identifier information, and processes the information by the platformside as needed. The system can provide a unified space and time information service for the public with a precise location information service, time information services and high communication reliability.

Abstract:Sonic tool maintenace and testing of electronic circut need the acoustic wave signal that the sound system probes supply,but as the abnormal signal caused by the degrees of coupling in the sink and in cased well of the sound system ,so the testing work will encount some influence.To solve this problem,this artile designs a set of electonic simulation sound system which can link sound electronic circut directly ,this system can make four wave signals under the action of the pulse producing by the sound,the jet lag of the wave signal and the first wave parameters such as amplitude can realtime display, and which can make precise adjustment by the keys. The experiment test and practical application show that each metric of the simulation sound system meets the design requirements. The system is small size and simple operation ,so it is very suitable for the scene and the use of various.

Abstract:In order to design a moving target fast tracking system with respect to a timelimited and stable tracking process, especially when the shape of moving objective or its environment condition change, a new approach based on matching local feature points named KPM (key points matching) is first proposed, and local Multiscale feature extraction and matching technology for images are also been researched. First, based on SURF (speeded up robust features) algorithm, interest points and vectors are presented. Second, combine nearest purifying and consistency purifying to move out features outside the target area, so that we can decrease the failed matching and improve the tracking precision. Finally, generate target affine transform matrix and update the moving parameter of the target. Experimental results indicate that KPM is mostly able to achieve a stable tracking while with the monitored target rotating, scale changing, and also the environment illumination glittering. Moreover, it can satisfy the system requirements of tracking stability, higher precision and antijamming.

Abstract:A control strategy of voltage balancer which is suitable for DC microgrid load unbalance is proposed to provide a stable and reliable DC power for DC microgrid system clients. According to voltage balancer main circuit topology, the small signal model of voltage balancer was established through state space averaging method. PWM control technology and PI sectors were introduced on the basis of the analysis of the circuit model to achieve the output voltage balance control and ensure the stability of the output of the balancer. It also suppresses the influence of load disturbance on the DC output voltage. A prototype with capacity size of 15 kW was built in MARTALB simulation software and the case of load variations on voltage balancer was simulated to verify the proposed method. Simulation results show the correctness of the theory and validity of proposed control strategy.

Abstract:For testing sequence design of large complex system, a differential evolution algorithm (DE) based on a hybrid strategy was proposed firstly.By LOV rules,real space was mapped to a discrete apace of testing sequence;The random mutation strategy and perturbation of small probability strengthened the exploration and development of the algorithm;The local dynamic operator was introduced to improve the convergence rate. Through an example other algorithms were compared to verify the effectiveness of the algorithm.

Abstract:Because azimuth and elevation difference channels are not orthogonal in monopulse angle tracking system, this paper presents a new digital phase calibration method by using two NCOs to compensate the azimuth and elevation phase differences to reduce the error of angle estimation with indepth study of the angle error extraction principle in I/Q processor. With an analysis of the precision of angle tracking under different calibration methods, the feasibility of the new method can be validated. As a simulation result, the precision of dualchannel monopulse angle tracking system can be improved.

Abstract:In order to overcome the slow speed of image encryption for android phone, an image block encryption algorithm based on pixel xor is proposed for the Android Phones. In this algorithm, the classic RC4 algorithm in cryptography is modified, and then applied to this paper’s encryption algorithm. Firstly, the original image is divided into blocks. Then, the improved RC4 algorithm is applied to the operation between the adjacent two subblocks, thereby changes the value of pixels. Finally, the image is scrambled by logistic map. Experimental results show that the image has a noiselike characteristic and a flat histogram after the original image is encrypted, and that the algorithm has an enough large key space, a very high sensitivity to the key and a fast speed of image encryption for android phone and the encrypted image has a good randomness and has a low correlation between two adjacent pixels.

Abstract:Increasing commercial camera resolution and detection sensitivity make it possible to observe the target space, And adopt the method of multiple unit array can further expand its field of view. Before the information fusion there must be a time registration to the acquisition of multichannel image; because the storage medium, such as CF card, the time registration can only use the relevant information in the image by postprocessing. This paper proposes a method by using multiple image sequence in transformation relationship, which can finish the time registration without the criteria that each image must of the same view. And it can effectively overcome the effects of noise and error matching, verified by the experimental registration accuracy can reach millisecond level.

Abstract:A control and communication system is designed for he 8arm MicroResistivity Scanning Imaging Tool. Based on DSP TMS320F2812, the system is able to decode the downlink commands from ground , to communicate with the other circuit modules, to control the acquisition of auxiliary data and to package and upload the logging data. The hardware design of the system takes advantage of DSP’s serial interfaces to simplify circuit structure and makes the system small enough for the narrow space of the logging tool. Meanwhile, the control processes and procedures are considered. The well logging data show that the system is reliable and could meet the demand of microresistivity scanning imaginglog.

Abstract:In order to be able to measure the parameters of the movingcoil geophone at any time in the lab and field construction site, based on DC excitation method, this paper gives a design scheme of movingcoil geophone parameter tester using Cyclone Ⅲ EP3C40F780 and ADS1282 as its hardware. As the main controller of the tester,The field programmable gate array(FPGA) receives data from ADS1282 and sends them to PC through Ethernet. After being processed by software, parameters of geophone will be got and saved. In this paper, a series of LGT20D geophones were tested by this tester. The results show that the geophone parameter tester has high accuracy in smalldamping geophone test.

Abstract:In order to avoid the FPGA language HDL code cumbersome, in this paper, by using Simulink integrated toolkit Xilinx FPGA unique System Generator module series, around three servo motor control application has carried on the simulation and experimental research. First of all, according to three kinds of servo motor control PWM signal waveform, the Simulink block diagram was established based on System Generator; Second, the Simulink simulation results correctly generated on the basis of HDL code; Then, using the ISE ModelSim simulation supporting software of HDL code test; Finally, on the basis of the ModelSim simulation results right code to load the FPGA hardware, and by using the ChipScope Pro PWM signal test. Accordance with the experimental results and simulation results, show that the method is simple, has a certain practical application value.

Abstract:An implementation of data transmission system based on FPGA gigabit Ethernet is designed with Xilinx VC707 evaluation board. The board integrates MAC hardcore and PHY chip, therefore supplying the foundation for Ethernet data transmission. The design also implements the UDP/IP protocol stack and allows data transmission based on UDP protocol between the host computer and the system. Besides, the data could be cached with the DDR3 that evaluation board possesses. Practices certify that the system is capable of implementing highspeed and accurate data transmission.

Abstract:AS5643 high speed serial bus is proposed to meet the realtime high speed data transmission application requirements in aviation aircraft building upon the foundation of IEEE 1394b protocol which ameliorates and enhances its realtime capability, certainty, reliability and message delivery mechanism. To promote the application of AS5643 technology, a study is conduct on AS5643 protocol to design the AS5643 LLC IP core transmission node conformed to the protocol based on FPGA. We build an integrated system with several nodes to validate the functions and performances of AS5643 node by using the test equipment to monitor and analyse the transactions on the serial bus. The experiment and test results show that this AS5643 LLC IP core conforms with AS5643 protocol which can achieve reliable high bandwidth of data transfer in the aeronautic application field.

Abstract:In view of the state of current market which the automobile tire pressure monitoring system uses the separate designed tire pressure sensor, micro controller and wireless, it has caused the problems such as large volume, cumbersome installation, short service life and high failure rate. This article is based on the SP37 sensor designed and developed by Infineon, which reduces the size of the system measurement module, controlled product manufacturing costs, as well as improves the measurement accuracy, reliability and stability of the system.The TPMS system can display the realtime tire pressure data and warn timely when danger comes in the running process. In the tire pressure testing of automotive field measurement,the system performed stably and achieve the desired purpose. Experimental data show that this design has many advantages such as good stability, high accuracy, and low system power consumption.

Abstract:In order to solve the problem of magnetic anomaly detection (MAD), many scholars have proposed the corresponding detection methods. These methods can only detect the presence or absence of the target, while obtaining anomaly signal itself can achieve the goal of locating and identifying the target. In this paper, the magnetic anomaly signal extraction model based on airborne platform and the frequencydomain correlation extraction algorithm based on convolution blind source separation (CBSS) are proposed. The extraction of weak magnetic anomaly signal is implemented. Simulation results demonstrate the feasibility and effectiveness of the proposed method.

Abstract:Traditional haze detector haze when calculating the concentration in the air only consider the scattering of light suspended solids, without considering the effects of humidity on haze concentration. Aiming at the shortcomings of traditional haze detector, this paper presents an algorithm that contains concentrations of haze and humidity parameters amendment, designed to complete the haze detection system. To reduce the impact of environmental factors, haze detection system uses a closed optical system and a constant optical power control and designs the optical transmitter module, optical receiver module, temperature and humidity control module, control module, air sampling and optical module, monitors components. By experimentally measured concentrations and haze linear relationship between the intensity of the scattered light using aerosol generator, the linear correlation coefficient is 0.976 5. By detecting the concentration of PM2.5 in the atmosphere, finally proves that the haze detector can work effectively.

Abstract:Traditional dust sensor is low precision and its precision keeping is poor in case of out door using, to resolve these problems, a multilaser dust detection method is studied based on Mie light scattering principle and a dust concentration detection system is designed . The optical measuring principle of dust detection system is introduced, luminous flux and particulate concentration calculation method is studied, and parameters of the measuring system are optimized. Moreover, a multilaser dust detection system is designed and the relationship between light transmittance and dust thickness is analysis. Experiment is performed compared with national measurement point and PPD4NS dust sensor, the result show that maxim relative deviation of the new system compared with national measurement point is 8.5%, the measuring accuracy is improved greatly compared PPD4NS.

Abstract:Laser fuse is an important part of modern laser homing system.The technology is rarey used in airtoair missile.The applicatiaon investigates the design of analog filters and DSP filters that reduce the influence of extraneous noise in data acquisition systems.The pulse constantcurrent source for the semiconductor laser is designed.Mathematical model for precision analysis was formulated to evaluate the performance of the presented approach.A contrast was given to test the effectiveness of the method.The experiment results show that the noise of drive source is reduced by 50% in the inproved control, which is specified as high control precision and good stability.

Abstract:A lownoise and wideband amplifier was designed for the weak laser echo signal. We chose the CFB differential operational amplifier THS4509 with low noise and high bandwidth as the core component; a twostage amplification circuit was adopted in order to obtain a larger gain, and a transmissionline voltage transformer was used to change the output signal from doubleended to signalended. To reduce the noise, we used a lowpass elliptic filter with the best transition zone features to filter out the noise outside the band. The experiences demonstrated that the amplifier had the characteristics of 40 dB gain, 120 MHz bandwidth, and its noise was less than 10mV(pp). It could effectively amplify the weak laser echo signal reflected by the different target objects even with a variety of reflectivity. Furthermore, the amplifier with the above characteristics performed better in solving the problem of long distance and low reflectivity, and its maximum measuring rang can reach 450m proved by actual tests

Abstract:Aiming at the application of highspeed data transmission, a system is designed to realize PCIE interface based on Xilinx FPGA. The system uses the PCIE hard core integrated on FPGA, develops the PCIE device driver using WinDriver under Windows 7 operation system, caches the data using DDR3 SDRAM and realizes highspeed data transferring with Direct Memory Access(DMA) between a host PC and a Xilinx FPGA board using Verilog hardware description language. The system has been verified on Xilinx VC707 development board and the result shows that the highspeed transmission system based on lane 1 PCIE interface can reach 154 MB/s throughput in DMA read and 169 MB/s throughput in DMA write for a DMA transfer size of 8 MB. The system can satisfy the requirements of reliability and efficiency during data transmission.

Abstract:Aiming at the issue of fault prediction technique of power electronic circuits’ a method based on characteristic parameter data and particle swarm optimization nonhomogenous grey model (PSONGM) for the prediction of power electronic circuits was proposed. The proposed PSONGM model can predict the development trend of fault feature parameters prediction, and judge the reliability life. Based on the buckboost circuit experiment, the new method can trace the characteristic parameters’ trend and can be effectively applied in fault prediction of power electronic circuits.

Abstract:A wireless communication system which is using iPhone mobile phone terminal and RT5350 module to transfer instruction and data to each other is proposed in the paper. The system establishes a wireless LAN platform, regarding the STM32 microcontroller and the RT5350 module as the hardware platform, the intelligent mobile phone which equipped with IOS system as the client, combining the TCP/IP protocol and serial transmission protocol and implementing the wireless transmission of video data stream, the mobile phone control instruction, and associated data. This system not only realizes the down transmission of the control instruction, but also realizes the upload transmission of data information. After testing, the wireless communication system can smoothly watch the video collected by camera , control the hardware without error and transmit data without error within a range of 35 meters, and the two transmission process does not interfere with each other.

Abstract:Aiming at the limitation of existing coal mine safety monitoring system, such as poor expansibility, longtime response and the relatively poor ability of monitoring moving objects, the article proposes a monitor platform which is developed by technology of IOT(Internet of things) to apply in the coal mine safety production. The platform is mainly composed of ZigBee wireless sensor networks, networking access server and PC visualization software system. It can be used to process, transmit, display and feedback information collected by various monitoring sensors. Through the test of mine simulation platform and undermine field test, it shows that the design enables the measuring and controlling of environmental parameters in coal mine and precise personnel positioning, it can be used to a valuable reference to the design of coal mine production safety monitoring.

Abstract:The actual rough land surface is simulated with the exponential type distribution rough surface, the wideband forward electromagnetic scattering from rough land surface under UWB Gaussian pulse electromagnetic wave incidence is studied using FDTD. The curves of forward electromagnetic scattering coefficient varied with frequency are obtained by numerical calculation, and compared with result under harmonic field source. The forward electromagnetic scattering coefficient varying with frequency is analyzed under the difference of the correlation length and the rootmeansquare of rough land height fluctuation, the moisture capacity of soil, the incidence angle. The characteristics of the wideband forward electromagnetic scattering from rough land surface are obtained. The numerical results show that the influence of various parameters on the forward electromagnetic scattering coefficient is obvious. Moreover, forward scattering coefficient with the changes of the incident polarization modes is also significantly different.

Abstract:Twodimensional oblique incidence problem of layered half space is generally translated into onedimensional condition to process, however, the effectiveness of this treatment method is closely related to the size of the angle of incidence. In this paper, the oblique incidence angle size of a onedimensional corrected processing method is researched, in the same time, using this method the impact on the time domain, frequency domain characteristics of the reflected wave is researched caused by dielectric constant , conductivity and dispersion characteristics of medium. The conclusion has a good guidance for FDTD analysis of layered half space and engineering applications such as the inversion of ground object.

Abstract:In DTNs, nodes do not have endtoend connections for long periods of time. Therefore,in order to provide reliable communications in the intermittent connection environment,intermediate nodes are required to store data packets for long periods of time. Enough buffer capacities and energy is the key to work of DTN network.The dispersion of nodes to make it difficult to implement. in this paper, we propose a social grouping based protocol(GBP) among the network nodes to maximize data delivery ratio while minimizing network overhead by efficiently spreading the packet copies in the network. Firstly, we introduce the principle of GBP, then using Opportunistic Network Environment (ONE) simulation software to compare the performance of Epidemic algorithm, Spray and Wait algorithm, PRoPHET algorithm, MaxProp algorithm and GBP. By comparing packet delivery cost, rate of messages delivered and average dealy, it finds that the GBP performs better. At last, the weaknesses of this paper and further improvement are also discussed.