Abstract:LT codes can dramatically enhance the network throughput as a rateless code. By Analyze the application of LT codes, according to the characteristic of transmission data with different priorities, aiming at the performance deficiency of equal error protection LT(EEPLT) codes, propose the design of unequal error protection LT(UEPLT) codes with different weight priority. The proposed different weight priority UEPLT codes provide different protection level to data layer. The performance is judged by the decoding overhead and bit error rate(BER) of standard picture transmission. The results of simulation show that the UEPLT codes can recover most of high priority data with extremely low decoding overhead, and have a better bit error rate (BER) performance than the equal error protection (EEP) LT codes with a reasonable overhead. Further more, the performance of UEPLT codes with parabolic priority is better than the UEPLT codes with linear priority.

Abstract:The counting function is commonly used in the industrial production. Recently, we are requested to add the counting function to a number of resistance sorters being used by a factory. The improved resistance sorter can help the management of the factory compute the workload of workers. After test the resistance sorter, we decide to design a counting system which consists of a signal acquisition circuit and a electronic counter. Statistics the number of resistors with the counting system is fast and reliable. It’s better than artificial statistical methods. The counting system which has a simple structure and a small size is easy to operate. The resistance sorter with the counting system meets the factory’s requirements.

Abstract:The cutoff frequency is soluted based on electromagnetic field theory, and network line is presented to analyze the relationships among coaxial connector’s cutoff frequency, the outer diameter of the inner conductor, the inner diameter of the outer conductor and the relative permittivity of the filled medium on the condition that impedance matched between coaxial connector and coaxial cable, which shows their relationships apparently. Finally, Three ways proposed so as to expand its working frequency band effectively. In addition, coaxial fixture at fixed size is studied in the field of electromagnetic parameters measurement, the result has shown that samples filled in the coaxial fixture are difficult to make the connector’s impedance exactly match with cable’s, and coaxial connector’s working frequency band reduces while the permittivity of test samples improved.

Abstract:Magnetic resonance coupling wireless transmission technology is a topic at the forefront in the field of power transmission . The technology enables power transmission by highfrequency magnetic resonance coupling. High frequency magnetic field is the media of realization of wireless power transmission. 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. A highspeed, wideband sample holder is the key to achieving high spatial frequency magnetic field strength synchronous detection. From the principle of the sample holder of ,the paper analyses of the impact of different operating modes and capacitance material within the sample holder to the performance of the sample and hold amplifier circuit in detail. Moreover, the paper discusses the spatial highfrequency magnetic field signal characteristics and requirements of the sample holder. On this basis,we designed a highspeed sample holder. In addition, we analyzed its performance under different experimental models in detail.

Abstract:Based on the principle of impedance measurement of currentvoltage method and digital measurement thought, a kind of DSP impedance measurement system is proposed. This system takes DDS signal source as the measurement excitation, sampling the signals at both ends of standard resistance and measured impedance components, and then put the sampled signal into DFT. Finally, the measured signals are separated to false or true through relevant computation and the measurement result is gained. By setting the sample frequency and number, the measurement error caused by the frequency leakage of signal is effectively avoided in the system. Upon the measurement experiment, several reasons for main measurement error and effective method to reduce the error are put forward, and consequently the relative error is kept in ±1%. Compared with the method that applies phase sensitive detector and time to digital converter to measure the impedance, this system ensures the measurement accuracy and significantly simplifies the hardware circuit and software design.

Abstract:Battery equalization management module is one of the most important function modules of battery management system, it can avoid inconsistency by realtime balance management according to the battery status information, which not only improve the battery group capacity utilization rate but also slow down the aging speed of battery group in a certain extent. This paper deeply analyzes the domestic and foreign equalization technology, and compares their advantages and disadvantages as well as applicable occasions according to the equalization circuit, control strategy and system structure of the three aspects , lists the research status of different methods, combined with the battery equalization technology research problems to be solved in series, the direction of its development is prospected.

Abstract:The nonlinearity of RF power amplifiers when they amplify signals causes distortion，which makes a negative influence on the performance of the communication systems seriously. To improve the third order intermodulation distortion，a new analog predistortion was introduced. This predistortion used the concept of complete matching IMD3 generator and two times fundamental frequency offsetting, which eliminated the fundamental frequency of IMD3 generator and reduced interference of the fundamental frequency to three harmonics. The circuit used the concept of pushing power and dualring structure. It optimized IMD3 of the L frequency range of the GaN amplifier obviously to improve the linearity of amplifier. By using the ADS2009U1 software, in the 950MHz single tone signal testing environment, the experiments show that the PAE of this system reached 52.1%. Furthermore, in the 945 MHz and 955 MHz dual tone signal testing environment, IMD3 gains the improvement of 15 dB. This predistortion realized the optimization of linearity in low efficiency loss.

Abstract:For the complexity of the problem of weak signal detection under the communication environment, lockin amplifier technique is used. The weak signal as input is for coherent reception with the phase reference signal that is adjustable, the noise mixed with an AC signal is transformed into a narrowband DC signal. System consists of a signal preprocessing circuit, a reference signal phaseshifting circuit, a phasesensitive detection circuit, the narrowband lowpass filter module. Wherein the reference signal phase shift circuitry provides the reference signal with the same frequency demodulation to improve the accuracy of phasesensitive detection circuit AC signal into a DC signal, the narrowband lowpass filter is used to remove broadband noise, accuracy is improved by many times for phasesensitive detection circuit measurement and least squares linear. This method ensure that the SNR is greater than 60 dB. when the signal magnitude within 10 μV-1 mV, detection error does not exceed 6% when noise is mixed with.

Abstract:In view of the disadvantages of some complex industrial installation environment and saving cost in general inverter, a simple vector control inverter which based on STM32 is proposed. The design of hardware and software were given. The hardware optimized design of it’s structure, so it more smaller、lighter and easy installation. The principle of SVPWM modulation and it’s realized on STM32 were described. Thus it combine with fieldbus technology can bring flexible and precise control in disperse system. The experimental result show that the system has less harmonic ware,real time control function,energysaving and reliable.

Abstract:The paper designs a new highprecision digital controlled alternating constantcurrent source system (ACCS), which is based on direct digital synthesis techniques. The system consists of the low frequency sine signal generator(SSG) and the constantcurrent circuits, in which SSG builds on STM32 Microprocessor and the constantcurrent circuits designs is in use of feedback based on power amplifying circuit, in order to achieve high output precision and high amplitude stability. The results show that the new ACCS can provide output current with controlled amplitude, frequency, phase, the output length, with characteristics of higher stability and precision, as well as lower noise.

Abstract:With the development of the office automation, and in order to adapt to the trend of development, liberate more human, improve the efficiency, maximum reduce manmade factors, this paper states how to use comprehensive informational technologies of modern computer network, database , to research and design a whole set of multifunctional and comprehensive management information system, which includes management of samples receive and dispatch, the management of measurement/calibration cost, the management of testing process, the management of testing reports, the query platform of samples measurement/calibration facing to the needs of clients. This System uses B/S and C/S mixed mode, With Delphi language and SQL2005 database for the development and implementation. Practical application shows that the system is security , stability, and its UI is userfriendly. the effect is good, very good to improve the efficiency of laboratory tests and daily work of intelligent management.

Abstract:According to the Reusable Launch Vehicle (RLV) is unpowered and with low lifttodrag ratio during Terminal Area Energy Management phase (TAEM), this paper studies a new trajectory design method based on number of trajectory. At first, this paper establishes 3DOF model of the sample RLV for trajectory design and simulation. Next, considering the flight task of TAEM, this paper design the flight corridor to express the restriction and also design the trajectory based on heightfly distance. Then, the trajectory database was built. At last, the nonlinear simulation environment is built in the MATLAB environment. The results show that the trajectory online selection is reasonable and the trajectory is robust.

Abstract:In accordance with the requirements of aviation motor reliability test, in order to improve the detection precision of the motor, this paper designed a kind of practical operation situation of aviation motor control system, adopts oil cooling method, designs and uses of Siemens S7200 series PLC module for the main control module, a touch screen interface design software for WinCC flexible, through the touch screen to monitor system of realtime data, realtime and dynamic display system of the collected runtime test parameters, observation of the whole system operation, alarm, analysis and control in case of emergency. Simulation results show that the control system can well realize realtime monitoring of the parameters in the oil source system, improve the detection efficiency and precision of air motor, achieve automation and intelligent system.

Abstract:The terahertz radar is getting more and more attention from researchers because of the high resolution it can obtain. The design scheme of a linear frequencymodulated continuouswave terahertz radar operating at 0.22 THz band is proposed in this paper with the experiment results. Lownoise high dynamic range detection comes from the heterodyne RF architecture of the radar. The transmitter of the radar employs direct digital waveform synthesis technology in the baseband to obtain a reliable fast scanning LFMCW source, the scanning speed of which is 40 μs with instantaneous bandwidth of 14.4 GHz. The result of dechirping is coincided with the theoretical value. The fast scanning speed and wide bandwidth characteristics make the radar an ideal candidate for highresolution security inspection and nondestructive detection.

Abstract:Proposes a method which is based on C4.5 algorithm to recognize the parking plot. First, we should record the driving trajectory of the car by the sensors of smart phone in order to obtain the data, such as GPS data,velocity,accelerated velocity , etc. Then it is necessary that to have the data processed to improve the precision with several means , such as remove the flying spot , compensation algorithm , Kalman Filter and so on . The next step is to get the data further processed through C4.5 algorithm in order to acquire the state of the car . Finally , the algorithm of recognizing the parking plot is used to make sure whether the spot is a parking plot or not . The results of the processing shows that the method that mentioned above is effective to find the potential roadside parking plot .

Abstract:This paper presents proposes a corner detector method based on anisotropic Gaussian directional derivative filters to extract the crude outline of image. Firstly, multidirection anisotropic Gaussian directional derivative filters are used to extract the variation of gray change information, and then the crude outline is extracted by using the gradient correlation of pixels. Finally, we construct the autocorrelation matrix on the basis of the extracted crude outline and normalize eigenvalues of the autocorrelation matrix, then the product of normalized eigenvalues is served as the measure of corner extracting. Experiments show that the algorithm is noiserobust and locationaccurate.

Abstract:Image inpainting is greatly applied in invarous areas. In order to find the algorithm which is easy to implement and can repair the conventional damage of image rapidly. A large number of algorithms are researched in this paper. Finally an image inpainting algorithm based on sample block is selected through the experimental comparison. Still it has improved here. At last an image inpainting system on the improved algorithm has been developed in MATLAB . The system is tested. And it shows that the system has very good effect in repairing the texture image and structural image damage through the experimental results. And the image restoration speed is also faster than the existing system. Especially for removing obstructions caused by the effect of repairing damaged areas. So the system is worth popularizing.

Abstract:ISAR (Inverse Synthetic Aperture Radar inverse synthetic aperture radar) is a kind of high resolution imaging radar, the imaging process is a heavy task of processing the high density computing and a large amount of data. GPU has dozens of times the CPU floatingpoint computation capacity and transmission bandwidth.The development of CUDA technology makes the multithreads, single instruction GPU architecture can quickly for parallel computing.This paper presents an efficient method of non coherent imaging using the parallel characteristic of GPU on the CUDA platform and realizes the parallel imaging processing.Compared with the general GPU processing method, the processing speed can achieve realtime imaging effect, and the operation rate is obviously improved.

Abstract:In recent years, the rise of the theory of compressed sensing signal sparsity requirements, so sparse representation of the signal received unprecedented attention. Taking into account the real signal is often nonsparsity, and compressive sensing theory must meet the requirements of the measured signal sparsity or meet at a certain sparseness orthonormal base, so sparse representation of the signal becomes very important. This paper studies explored the sparse representation of the binary mask pretreatment. The algorithm combines the binary mask the human eye is not sensitive to the removal of the DCT coefficients to improve the measurement sparsity factor in subjective image without compromising quality. Experimental results show that our proposed method reduces pretreatment CS reconstruction time and improve the quality of the reconstructed image.

Abstract:This paper presents a language identification system based on GMMUBM algorithm, the system combines the border of Yunnan radio regulatory characteristics, depending on the frequency, receiving location, etc., using different identification sublibraries for the identification of crossborder signal can be better improvement of crossborder due to poor signal quality monitoring to lead to a simple algorithm using GMMUMB recognition rate not high. After Mans monitored for crossborder recognition experiment actual signal, identifying the effect of significantly improved, demonstrate the effectiveness of the system.

Abstract:One embedded diagnostics system for radar is designed based on the requirements of fault detection, diagnosis and maintenance. The paper introduces the theory of design, diagnosis strategy and method of realization from system frame and software architecture two aspects. The system realized BIT monitor, automatic testing and integrated fault detection via an embedded structure design and philosophy of software refer to constructional element. The system is provided with generality, portability and expansibility. The application has proved the system stable performance, easy operation and maintenance, has a higher application value.

Abstract:Now UART and Ethernet are widely used in applicationembedded systems, such as data acquisition equipment and instrument. This paper introduces a design in which the MCU controls the CH376 to read or write files from a USB flash disk, and provides schematic diagram of hardware and part flow sheet of the program. It is proved to have several advantages such as low cost, easy application and stable running. The solution fits the application especially in measuring system and data acquisition equipment.

Abstract:Aiming at the problem of bad realtime, slow processing speed, short transmission distance and the shortcoming that it cannot be composed of the monitoring net in the security of building, a remote controlling system for the security of building based on the STM32F103ZET6 microcontroller is designed. After the STM32 microcontroller achieves realtime data including temperature, humidity, CO2, O3 and smoke scope from the sensors, it will actively connect to the Web server through the Internet, and then, any device who can also connect to the internet could access the Web server through any browser and control the STM32. On this way ,it can get the local data and achieve the reliable remote control and information exchange for the building. If there is a fire or the environment of the building is not well, the STM32 will send alarm signal to the Web server, at the same time the firefighting equipment and other devices will be opened to keep the building safe. After field test, the system can achieve realtime data accurately and be able to control the environment efficiently . It proves the feasibility and stability of system.

Abstract:In order to help teacher master the remaining time of current class, improve teaching efficiency, the time can be calibrated remotely. A teaching time management system is designed. Realtime clock chip (DS1302) is used as reference time, the system is prewritten curriculum schedule, and recording the Beijing time and remaining time. ZigBee wireless network is built to send control commands to each node. The working principles of the system, the hardware design and software workflow are analyzed. The experiment turns out that the date acquisition and procession can be done by the system reliably, and remote control is realized, improving the applicability of the system.

Abstract:In the performance test of capacitive transducer, due to parasitic capacitance and electromagnetic shielding problems, it’s difficult to ensure the precision of capacitance value, so design a switched capacitor network to solve this problem. First, building the switched capacitor network module, through choosing low parasitic capacitance components and designing multiple layers PCB boards, can reduce the parasitic capacitance and improve the capability of electromagnetic shielding. Then, building 6 choose 1 module for data acquisition and processing. Furthermore, building processing central module based on STM32 for system control, data analysis and storage. Finally, carrying out different capacity value tests on capacitive transducer. The test results showed that the accuracy of capacity value reached ±0.04 pF in switched capacitor network module, and acquisition accuracy reached 4 mV. The experimental results verify the reliability and accuracy of this test system, and it provides an important reference for further development.

Abstract:An external memory is necessary to store data and status files for new automatic weather station. This fixed format files are filled with time and the character “” when the time has not arrived yet. This paper introduces a solution that uses the asynchronous copy method to solve the problem that the station can not collect meteorological data normally when the SD card files are being generated. And the generated files meet the new automatic station file format. The experiment results proved that the collector works well and the collected times are not affected and the files sampling data is 100 percent right compared with the software data.

Abstract:This article expounds the research of the spectrophotometer used in determined the chemical oxygen demand(COD),discusses the research method of the optical system and electronic system.Optical system using symmetrical Czerny Turner system, and use the holographic plane diffraction grating as light splitting element, which improves the spectral energy and spectral resolution.Electronic systems using the high speed high accuracy logarithmic amplifier log114, improves the detecting precision and response speed.Use the COD standard solution calibration Instrument,Compared with HACHDR6000,that proved the COD detection system’s performance and accuracy are stable and reliable.

Abstract:We introduce the WebGL technology and Three.js which is one of WebGL application framework, we also describe the design and implementation of basic structure and each module of interactive platform，and propose an algorithm of loading 3D model to load the OBJ model by parsing data of model’s vertex, face, normal vector and so on. At last we do the multbrowser testing and loading speed testing, the result shows that this platform can run correctly on Firefo, Chrome and Opera without modifying any code, its loading speed is fast and the platform can display the model smoothly.

Abstract:In order to adapt to the fishery remote radio frequency communication, this paper puts forward a fishery enforcement system based on the remote ZigBee design and BeiDou Navigation Satellite System. Ultralowpower controller adopted Atmel product AT86RF230 effectively solves the disadvantages of the traditional remote RFID and broadens the application of RFID system. Test results show that the system runs stably and reliably, sending and receiving data accurately, increasing identification distances, which improves the overall performance obviously.

Abstract:Realtime and online detection of reverse osmosis (RO) membrane pollution is a key problem, but few researches was done in this area home and abroad. In this paper, the research of measuring the fluidflow of RO membrane by using RTD is outlined, and the diagnose system of spiralwound reverse osmosis is introduced, and data acquisition, display and processing of RTD response signal for RO membrane module are completed using LabVIEW software, and detection experiments and data analysis under the same condition of new and old membrane are done. The results showed that this method could realize realtime online diagnosis of RO system and be widely applied to RO seawater desalination projects.

Abstract:Near field communication is a kind of short distance wireless communication technology based on the development of the wireless radio frequency technology. In view of the present can not meet the requirements of data transmission in a mobile terminal of large capacity, high efficiency of the problem, in this paper, the main methods to realize high speed communication is presented in this paper. The analysis of near field characteristics of antenna coupler FDTD computing model bynear field coupling way. The modulation of Gauss pulse feed, by FDTD simulation method,analyzed in detail for different position coordinate corresponding timedomain waveform andspectrum, electromagnetic coupler and at the same time shape compared so as to obtain the optimization model. It has certain reference value to the conclusions of the study design of highspeed nearfield communication antenna.

Abstract:Because of the UWB(Ultrawideband) channel multipath sparsity, its estimation is based on sparse assumption. It usually adopts the compression channel sensing technology. However, in the indoor environment, scattering which is caused by multi obstacle environment often leads to ultra wideband channel presents a sparse and dense hybrid mode. Therefore, in consideration of the scattering characteristics of the case, based on the STOMP (stagewise orthogonal matching pursuit) compressed sensing algorithm, this paper proposes a novel channel estimation method which called STOMPMMSE. The algorithm overcomes the assumption based on sparse which ignore the scattering component of the channel, improving the accuracy of channel estimation. The simulation results show that the method proposed can help ultra wideband hybrid channel which contains scattering component to obtain the estimation error smaller.

Abstract:For the realization of the end to end secure encrypted communication of voice,this paper proposes a new voice encryption algorithm,which can penetrate RPELTP compression encoder. In the sender,the algorithm scrambles with the voice signal in frequency and time domain based on DCT transform domain .In the receiving end, it decrypts and reconstructs the signal. Opreation process is limited in real number domain and does not involve the phase estimation problem,it avoids the loss of voice data.The results show that the encryption algorithm can realize the nonnoise signal of the encrypted voice,maintains the characteristics of the speech signal, meets the requirements of input signal to penetrate RPELTP compression encoder.Reduce the encrypted speech intelligibility further, improve the quality of the decrypted voice.