Abstract:In order to solve the problem of engineering verification and evaluation of large radar system, a simulation system of radar integrated test bed is designed. In view of the diverse radar working mode and characteristics of large complex electromagnetic environment, the use of digital simulation technology, the design of radar detection space target and interference of the sparse distribution, radar environment in radar detection space distribution or distribution environment and radar echo modeling, constructs a set of comprehensive test platform of radar simulation system. The test results show that the simulation system of radar integrated test design using digital simulation technology of the strong versatility, low cost, convenient use, solves the complexity and cost of large radar system evaluation in real life gradually rising problem.

Abstract:As a new type of power transmission technology, wireless energy transmission provides a convenient charging way for the rapid growth of electronic products. The large power driving circuit, charging distance and efficiency have been factors restricting the application of wireless charging technology. In order to solve these problems, the equivalent circuit of wireless charging is analyzed theoretically based on the theory of magnetic coupling wireless energy transmission, and the main factors that affect the charging efficiency are discussed. Using STM32 microcontroller as control core, a wireless power transmission charging experimental platform is built through the design of high power H bridge driving circuit and rectifier circuit. Based on this platform, factors affecting the system performance analyzed, including the operating frequency of the system, the distance of wireless charging and the relay coil. The results show that the system function of the wireless energy transmission charging platform is relatively complete. With the certain 24 V driving voltage and the certain charging distance of 2 cm, the load receiving power can reach 2.5 W.

Abstract:In order to improve the operational efficiency of the substation staff switching, reduce labor costs and reduce the power accident caused by misuse, developed a service robot. The robot local side is based on Android software, combined with operation ticket tasks and an innovative positioning method based on scan code, making sure that it can accurately reach the appropriate workplace and assist staff complete switching operation. The paper takes fuzzy PID control algorithm to ensure the robot run along the predetermined path. Staff can monitor the actual state on remote terminal, which is based on LabVIEW software. After put into operation, the service robot can help to improve work efficiency, reduce power accidents, promote the intelligent development of the power grid, and it has huge application prospects

Abstract:This paper presents some problems of noise margin test methodin the MIL-STD-883K use. Based on the analysis of the noise margin test methods used in the industry, the differences, advantages and disadvantages of the methods are compared. Analyzing the reason why noise margin test in the standard method is rarely revised, the paper proposes the applicability of the noise margin test methods in MILSTD883K and the industry, and revision directionsforour corresponding standard in China. The test results show that maximum product criteria and dynamic maximum equal criteria are applicable in a wide range, and can be used in the corresponding standards in China.

Abstract:Single event upset (SEU) is one of the most common faults caused by the radiation environment of space instrument, and solar activity is an important factor affecting the space radiation environment of the space instrument. In order to analyze the effect of solar activity on the single event upset of space instrument in this paper, the relation between the solar activity changes of the 24th solar cycle and the onorbit single event upset data are studied, which are collection from 48 instruments in three different low orbit satellites during March 2010 to April 2015. By combining the sunspot and SEU we found a negative relation between the solar activity with the SEU and the SEU curve after a specified delay had a strong correlation with the sunspot curve during the activity period, the lower the orbit, the better the correlation. This finding provides an important reference value for the prediction of the single event upset of space instrument. The reliability of the instrument in the space environment can be predicted and evaluated by observing the change of the solar activity for a specific period of time, so as to avoid the space radiation risk by designing the anti radiation reinforcement scheme.

Abstract:Radio remote control is the use of radio frequency signals for remote control of the remote control equipment. This paper introduces a design method of wireless remote control switch system, and describes the structure and working principle of the system.In order to reduce the traditional wireless remote control switch in the process of coding and decoding errors,improve accuracy of wireless remote control and reduce the power consumption,the volume, and so on.The system directly use mpu6050’sdata as the switch control signals,use stm32f103zet6 as main control chip,and use nRF24L01 as wireless transceiver module,the system design a wireless remote control lighting electrical switch based on mpu6050,including hardware and software design, and the hardware simulation was carried out by keil,and experimental verification of the whole system was carried out. Simulation and experimental results show that the system realizes the function of controlling the electric switch,improve the accuracy of the wireless remote control switch,and reduce the power consumption and volume of the wireless remote control switch.

Abstract:ThroughWall detection is usually in the external environment with many scatterers. Whether metal objects or people exist or not has different effects on wall parameters inversion, and further affects the accuracy of locating and imaging through the wall. Different external environment is simplified different scenes. A model of electromagnetic wave propagation through the wall is built according to the theory of electromagnetic wave propagation and the Fresnel equations, and the theory and procedure of extend prony method for enhancement resolution in a SFCW throughwall radar and wall parameters inversion fast algorithm are described. A method of wall permittivity and thickness inversion is presented, and the experiment is performed in multiscenes. At last, the results of the experiments are contrasted with the true value. It is concluded that the method is highly adaptable in different scenes, and the wall parameters calculated are valuable references of throughwall detection in reality.

Abstract:Based on the indepth study of the current situation of the container temperature control system, the cost of the container temperature control system is high, low precision and adaptive error. Combining the fuzzy PID control algorithm with the container temperature control system, the fuzzy PID control theory of the container temperature is put forward creatively. Based on the fuzzy PID control principle, a temperature adaptive fuzzy PID controller is designed. Based on the fuzzy PID algorithm in detail and the theoretical analysis and the actual container temperature control combined fuzzy PID control system applied to ultimately build a container temperature control, and the system into system simulation in MATLAB/Simulink environment, through the comparative analysis of the simulation results, verify the feasibility of the controller accuracy and stability.

Abstract:In order to measure the frequency of a sinusoidal signal in high precision, the article designs a digit frequency meter based on FPGA (field programmable gate array). Besides measuring frequency, the device can also measure the time interval of two square signals and the duty ratio of a pulse signal.With FPGA and MCU (micro control unit) as the kernel, the meter adopts the method called ‘Parallel MultiWays Counting Method’ to realize the high precise measurement. Specifically, signals would input FPGA after high frequency amplification module and high frequency comparing module. And then signals would be divided into multiways to decrease frequency by different times and be counted synchronously. Finally, MCU would select the mostaccurate result and get the final result after computing. After the test, the meter can measure the frequency of a sinusoidal signal from 1 Hz to 199 MHz and from 10 mVrms to 1 Vrms with the relative error not above 0.0001%; the meter can measure the time interval of two square signals from 50 mV to 1 V and from 100 Hz to 1 MHz with the relative error not above 1%; the meter can measure the duty ratio of a pulse signal from 50 mV to 1 V and from 1 Hz to 5 MHz with the relative error not above 1%. Therefore, the meter has thefeature of high precision, wide frequency range and wide amplitude.

Abstract:In the modern war, the intelligence of conventional ammunition is of great significance. However, in the process of intelligent transformation, in the face of high overload, high speed test environment, the traditional inertial devices has been unable to meet the engineering requirements in many aspects.Such as the range, precision and cost. The geomagnetic field is a regular stable field, It has important applications in the fields of earth science, aeronautics and astronautics, resources exploration, transportation and communication, national defense construction, earthquake prediction and so on. According to the characteristics of the rotational speed of conventional ammunitionthe,geomagnetic data is collected by the combination of the geomagnetic sensor. The moment of zero crossing of geomagnetic signal is calculated by software algorithm,and then settle the projectile rotation speed. The feasibility of this method is proved by experiment.

Abstract:In order to meet the test requirements for low speed flow field, based on the seven hole probe velocity measuring principle, this paper designed a set of multichannel probe velocity measuring system by sevenhole probes, which is given a detailed design of the embedded hardware circuits,upper and lower computer software system. which is based on the Modbus communication protocol, improved the consistency of pressure measurement data through the pressure coefficient of sensor calibration. The probe calibration experiment was carried out in the low speed wind tunnel, by analysis the results of probe calibration wind tunnel experiment, the absolute error of the probe’s pitch angle and azimuth is 0.2o. On the basis of the results, this paper puts a further analysis on the probe aperture and sensor measurement errors to the effects of measurement results.

Abstract:Now that the present tramcar braking method shows out many problems, such as low energy recovery rate, poor braking effect, bad antijamming ability and single recovery way, we studied the braking method, energy recovery, energy transfer and storage, improved present tramcar braking method, redesigned tramcar braking energy recycling system. This system uses super capacitors as energy storage, taking advantage of short charging time and large current discharge of super capacitor, fundamentally overcoming the traditional braking resistor issues like large heat release and low energy efficiency. The recovery energy of this system can provide energy to other tramcars on the same line by DC/DC converter and can also provide energy to other auxiliary systems through DC/AC inverter，which greatly improves the stability, reliability and recovery efficiency of the system. Matlab/Simulink Simulation results show that this system through the recovery of braking energy, improving energy efficiency of the tramcars and load capacity and stability of local power grid. The system has the features of simple operation, long service life and also has a good application and popularization value.

Abstract:It is an important part of the Smart car that using mobile Internet technology provides locationbased services for automotive users. In the current field of automotive services, applications only provide basic services such as positioning and navigation. There is few application provided more personalized service for automotive users. For the convenience of automotive users to fix the vehicle's location in realtime and let automotive users know the information in a vehicle, on the basis of deep analysis of the current situation of mobile applications on the vehicle side, the paper put forward and realized the design scheme of an automotive service system based on Android.The system is divided into the information management module and the map module. Information management module provides the user of the vehicle a stage to display the information of formaldehyde, PM2.5 and PM10. Map module uses Baidu Maps API to achieve the functions of the fixing position for the user of the vehicle, driving directions and searching for nearby services.In practice, the system that has high positioning accuracy and accurate route planning can work steadily. Compared with the traditional map, it can refresh vehicle location in real time, its functional design is more suitable for motorists.

Abstract:Singlephase ground is an accident that often occurs in low voltage distribution systems of chemical company, this paper analyzes whether the high voltage side of the transformer over current protection can play a role in the lowvoltage side ground fault protection by calculating, then analyzes how to set ground protection at the low voltage circuit breaker of the total line and the branch line, discusses how to achieve rapidly removal of singlephase ground current with useing ground fault protection in each electrical circuit breakers to. Finally, at low total incoming circuit breaker and feeder breakers cancel out the trunk ground fault protection, and the use of the circuit breaker when the general conclusion of each load circuit breaker ground current is greater than the instantaneous current.

Abstract:Aiming at problems that the teaching of theory is too abstract,video displaying is too simple and lacking of interactive link,and physical demonstration teaching equipment cost is too high,.existing in the process of teaching of flowmeter,we design a flowmeter 3D simulation teaching system.In the design of the system,we make the ultrasonic flowmeter of π type pipe sections to be the research object. Firstly,we use the modeling tools of 3DMAX to make the 3D modeling of it.Then we import the modelings that it is disposed by applying colors to a drawing into Unity3D machine software.Next, we make the lower computer system that can control the displaying of teaching. Finally,let’s the lower computer system to communicate with the PC system.And this system realize the function of the 3 D dynamic displaying of ultrasonic flowmeter and the interactive teaching simulation.This system makes full use of 3D modeling technology of virtual reality technology and the advantage of 3D interaction techniques,bring the sense of reality to teaching, enhancing the students' enthusiasm for learning,improving the learning efficiency of students,shortening the training cycle,and educing the teaching cost.

Abstract:The spatial domain building method is used to generate rough soil surface with Alphastable distributions，the characteristic of electromagnetic scattering from rough soil surface in the condition that the tapered wave incidence by using method of moment. The varying relationship of scattering coefficient with scattering angle is numerical calculated, the influence of the stability coefficient, normalized scale parameter, crosscorrelation length, the incident wave frequency, and moisture of soil on the scattering coefficient is analyzed. The results show that the influence of the stability coefficient, normalized scale parameter, crosscorrelation length, the incident wave frequency, and moisture of soil on the scattering coefficient is obvious, and the different laws are obeyed.

Abstract:In view of the limited channel bandwidth of wireless network control systems (NCSs), a codesign method of eventtriggered scheme, signal quantization and state feedback L2 control are proposed. Initially, in consideration of wireless network timevarying delay, an eventtriggered communication scheme is put forward, and the mathematical model of quantization control for linear systems is established. Furthermore, based on this model and by applying a new Lyapunov function and linear matrix inequality method, criterion for the delaydependent L2 quantization stabilization and criterion for the codesign of both the state feedback gain and the trigger parameters are derived. Finally, the effectiveness of the proposed method is verified by simulation.

Abstract:Nowadays, the development trend of the global smart grid is swift and violent and its core technology is gradually improving.At the same time, the Chinese government devotes develop smart grid in order to stimulate the economy.Smart meters due to is very close to the life ofthe vast number of consumers living with electricity, so its application technology is also widely popular among residents.Through the development of smart grid, smart meter has been quite popular as its smart terminal.In addition to a number of basic power calculation functions, they have some more new intelligent functions in order to apply to the development of new energy and the requirements of smart grid, which is different from the previous use of the meter,such as bidirectional data communication, the control technology of user side, multiple rate twoway metering and anti powerstolen etc.In this paper, the measurement method of single phase intelligent electric meter is studied.The voltage and current signals transform analog signals to digital signals by means of the high precision analog to digital converter. Then, the signals get through the high pass filter and the sampling filter, filtering out the DC gain and high frequency noise,then they can get the required voltage and current sampling data.After the voltage and current data are multiplied, the instantaneous active power can be obtained,and the average active power output gets through the low pass filter output.In addition, the voltage and current sampling data can get the effective value of voltage and current through the square circuit, low pass filter and square circuit respectively. The active power can be obtained through the integration of time, and the active energy can get.

Abstract:Aiming at the modeling of complex terrain and large scale scene of transmission line, this paper discusses the virtual terrain rendering optimization algorithm. On the basis of collecting the terrain elevation data in the location and range of the transmission line, Delaunay triangulation is generated by divideconquer algorithm and pipeline technology. Moreover, a method of optimal parameter selection based on genetic algorithm is introduced to solve the problem of triangular surface with Gauss's surface equation. And the threedimensional visualization of transmission line is achieved on the platform of Qt and OpenGL. Simulation result shows that this algorithm is effective for the virtual visualization of the real terrain of transmission lines.

Abstract:In order to solve the problem of nonstandard installation and low training efficiency in oil pumping unit，the virtual simulation system is developed which is based on virtual reality technology. Research on tower type pumping unit，using 3ds Max to create models which is required in pumping installing virtual scene and using Premiere editing animation video，using Microsoft Visual Studio to develop exam system. Finally using Unity 3D to build virtual scene and develop the virtual system of oil pumping installation．Results shows that virtual simulation system can effectively regulate the installation operation and improve the training efficiency． It shows that the virtual simulation system can overcome the boring classroom teaching and avoid security risks brought by real operation, effectively regulating the installation operation, greatly improving the efficiency. The application of virtual reality technology in equipment installation and training has a promising future.

Abstract:HDMI is widely used in the field of digital multimedia, limited to its highspeed transmission characteristics, it can’t be tested by the traditional ATE directly. We design a HDMI test method and develop a functional test module to decode chip and synchronous calibration as the core, the module can realize the control and analysis, signal communication and monitoring mechanism. By embedded into the integrated circuit test system with VXI bus, the function and DC parameters test can be realized relatively complete. The test results indicate that this method is stable and reliable, the test efficiency is high.

Abstract:The pulsed magnetic field measurement is an important researching content of the electromagnetic protection field and the basis in electromagnetic pulse (EMP) study. A new probe is designed using GMR chips. It has many advantages, such as, simple structure, small volume, wide measuring range, high frequency response etc. After calibration by experiments, the probe can be used to measure threedimensional pulse magnetic fields, intensity range of -40~+40 Gs, frequency range of 0~1 GHz. The magnetic signals, after converting into voltage signal, are collected and stored in SD card by TMS320F28335 DSP. Finally, through the CanBus network, the distributed pulse magnetic field measurement system is proposed. Experiments show that the system has advantages of small volume, flexible configuration, the large capacity of measuring point, strong antijamming capability.

Abstract:Radar digital IF system is the core component of radar receiving system, its performance directly affects the efficiency of the whole radar system. The hardware test platform and software control program of a portable digital IF test system are introduced. Through the A/D signal data acquisition and I/Q data test of the weather radar digital intermediate frequency, the analysis of the digital IF A/D Signal and I/Q data FFT frequency domain analysis interface and Time Data time domain analysis interface graphics, can quickly analyze, process and display, can be accurate and efficient completion of the weather radar digital IF testing and maintenance; the system completely Which solves the condition that the radar station can not be equipped with expensive equipment such as spectrum analyzer, shortens the time and effectiveness of the technical support, and improves the service guarantee aging of the weather radar, thus providing a new solution to the onthespot test security system of the weather radar Program.

Abstract:This article introduces the design and implementation process of the vessel ship satcom stations multiplex spectrum monitoring system, introduces the overall design ideas, gives the system hardware design structure composed of frequency conversion and calibration + frequency spectrum analysis and calibration + display and control. According to the system requirements and combined with actual situation, this paper introduces the design idea of comprehensive test software which realizes the capabilities of ship borne satellite communications multichannel spectrum signal’s online monitoring with vessel, realtime analysis and testing RF signal of ship borne C, Ku/Ka satcom station, realtime distributing test data and alarm information using LAN. The system improves the reliability and maintainability of the satellite communication system, and gives strong guarantee for safe and reliable operation of the system. Tests show that the system design is simple, stable and reliable, meets the functional requirements.

Abstract:In order to provide the basic data of shipping security, marine production safety and military activities of Guangdong，Guangdong Provincial Meteorological Bureau takes the lead in the research and development of the ship automatic weather data acquisition system. Through application of the technology of STC MCU,digital conversion, timer interrupt and serial communication, the function modules such as signal acquisition, data quality control, Beidou communication configuration and remote parameter modification are constructed, the system realizes the realtime collection of temperature, relative humidity, wind direction, wind speed, air pressure and other metadata, uploads data through the Beidou terminal and corrects error running parameters remotely. And comparing with the observation data of the oil automatic platform, it validates the accuracy of the system data acquisition. The actual result indicates that the ship automatic weather data acquisition system is of high precision,stable and reliable, and meets the needs of meteorological services betterly.

Abstract:Intelligent pipe gallery is the “neural network” of smart cities, The safe and stable operation of the intelligent pipe gallery have important significance to the development of the city, the industrial production and our daily life. Based on embedded system technology, the disaster early warning system for intelligent pipe gallery is designed. We select the STM32F107 Interconnected microprocessor, this System can monitor the environmental information such as gas concentration, temperature and so on. It will monitor power pipeline and gas pipeline and other key regions completely，and also has the functions to alarm when parameter values exceeds the threshold and to start the emergency devices. It has important significance to stable operation of the intelligent pipe gallery and our daily life. Additionally, the system can be linked with video monitoring system，it can combine the big data generated by the Intelligent pipe gallery with the urban management, to promote development of smart city.

Abstract:The wide application of ATLAS language lies in its characteristics of signal basement,test object orientation,independent of test equipment,etc,and is general language in test field for writing test program and descripting test requirements.Design procedures are described in detail in this paper,and VC++6.0 software is used to write the indicator’s automatic test program of magnetic heading system heading precision and it is achieved by ATLAS language,at last, by GPTS3.0 general automatic test platform and ATLAS language to realize the automatic test program of indicator.Test results show that autotest system of a indicator based on ATLAS language could get predicted results.

Abstract:In the detection of the concentration of the solution system of ultrasonic time difference method, only the detection precision time parameter reaches microsecond, which influence the accuracy of the system, in order to improve the detection accuracy of solution concentration, the ultrasonic phase difference method to detect the concentration of the solution. Based on the ultrasonic phase difference model, with MSP430F2272 MCU as the processor, dual ultrasonic transceiver for detection device design solution concentration measurement system of ultrasonic, the digital phase detector AD9901 ultrasonic detection by standard sample solution and the solution to be measured by the corresponding phase difference, converted by the SCM calculated concentration. The experiment shows that the system error is less than 1%, and the device has stable performance and simple structure, which meets the requirements of the expected design.

Abstract:Piezoresistive pressure sensor is easily affected by temperature to make zero drift and sensitivity drift. To reduce the influence coming from temperature, the reasons of the temperature drift error was analyzed at first. Then a hardware temperature compensation method and a software temperature compensation method based on MAX1452 were introduced for the temperature errors and the noliner of the sensor. The principles of the temperature compensation based on MAX1452 and executive processes were emphatically described. Finally, these two temperature compensation methods were compared and analyzed through temperature test and temperature cycling test, the results show that the software temperature compensation method was a more excellent method, the measurement accuracy in the range of -40～60 ℃ is smaller than 0.5%.

Abstract:Wireless mesh network is a new system of wireless information exchange network, due to the immature solution of communication protocols, there is no unified communication solutions. The existing routing protocol each have their own shortcomings,after analyzing the advantages and disadvantages of various types of protocol, proposeda routing algorithm based on multi transceiver which is able to avoid those busy nodes and to reduce network latency. Under the new system, mesh node would choose routing mainly based on ETT(expected transmission time) of every routing rather than minimum hops, which would provide a better way to choose routing that is able to avoid increasing partial network congestion while increasing network throughput.With thehelp of simulation software OMNeT++4.0, we can found that the new routing system has some advantages in networktraffic occasions comparing with traditional routing system.

Abstract:This paper proposed a novalutralwideband (UWB) bandpass filter (BPF) based on miscrostrip multimode resonator. The filter consists of a miscrostripstubloaded threemode resonator and a pair of novel dumbbellshaped defectedground structure for harmonic suppression. In addition, the stub of the threemode resonator is modified into a stepimpedance stub to achieve the desired band width. A crossfinger feeding structure with a backgroundaperture compensation technique is also used in this filter design to strengthen the energy coupling. The simulatedresults of the proposed UWBBPF show a 3 dB passband with a fractional bandwidth over 81.8% (within 4.04~9.63 GHz), insertion loss lower than 0.2 dB, return loss over 24 dB and 10 dB stopband extending to higher than 30 GHz. The passband of the BPF also shows a very sharp skirt property because of the transmission zeros at both the lower and upper side of the passband. The UWB spectrum mask issued by the Federal Communication Commission(FCC) is satisfied well by the designed BPF. The structure of the proposed UWB BPF is quite compact (smaller than 0.5λg×05λg at the central frequency) and easy to fabricate at low cost because its minimum stripwidth and minimum gapwidth are both 0.1 mm.

Abstract:The issue of spectrum leasing between primary and secondary users combining queueing theory have been studied in cognitive radio. The paper formulate a duopoly model based on sharing access mechanism of M/M/1 queueing model. Considering both pricing and heterogeneous secondary users access selection problem, we analyze the spectrum selection strategy for maximizing the revenue of POs and minmizing the cost of users, and the optimal pricing based on noncooperative competition and cooperative game is structured. A unique Wardrop equilibrium is reached by heterogeneous secondary users for this spectrum selection. The convex optimization and the Lagrange dual approach is proposed to solve the optimization of cooperative game. The revenue and pricing strategy for both noncooperative competition and cooperative game are compared via numerical simulations.

Abstract:In this paper, a method of calculating the creepage distance of insulators based on 3D reconstruction technique is proposed. First of all, the TSDF data within the threedimensional voxel grid are obtained by the framework of KinectFusion algorithm. Then the effective contour points representing the creepage distance are extracted in the twodimensional section obtained by symmetrical cutting. Then we traverse the effective contour points to calculate the creepage distance of insulators. The innovation lies in the construction of threedimensional model of the insulator, changing the shape of irregular objects into voxel to compute and process. The experiments show that the method is fast and accurate, and the average error remained at about 2.7%. Validated by experiments, our approach can bring the convenience to the measurement and production. In addition, the repeated measurements due to the inaccurate result are avoided.

Abstract:In order to solve the current image matching algorithm in identifying goals, rotation, scaling workpiece has the problem of matching positioning success rate is not high, is proposed in this paper based on the analysis and moment invariant features of rotary workpiece contour matching algorithm. First of all, using the adaptive binarization of image preprocessing, and traverse the image contour, contour sequence was extracted and area computation, realize to rule out the impurity interference. Then by calculating image moment invariant features of contour sequence, establish function matching degree, compared with template target moment invariant features, complete the rotating zoom workpiece target matching. Test results show that compared with the current image matching algorithm, the target is zoom, rotate interference, in this paper, matching algorithm has a higher success rate.

Abstract:Type of tire defects directly determines whether the tire is defective products or waste, which has important reference value for tire grading, it is vital to explore high performance tire defect classification method. First, collecting five common types of defects and a normal images from a typical tire manufacturing, namely beltforeignmatter, sidewallforeignmatter, beltjointopen, cordsdistance, bulksidewall and normalcords, was used to perform the tire defect classification experiments. And downsampling or upsampling the images in the dataset to a fixed resolution of 127×127. And then designing depth network which contains 5 convolutional layers, 3 maxpooling layers, 3 fullyconnected layers. Finally, training and testing the designed depth network with defect samples collected. Experimental results showed that the method proposed has higher recognition rates for tire defects than other algorithms, the averaged rate of recognition is high to 96.51%.

Abstract:In view of steganography and anti steganalysis ability requirements, the zerosteganography techniques to hide information is proposed, and the theoretical model based on the sample type zerosteganography is derived. In addition, the robustness and pretreatment of the steganography is analyzed，considering the discrete cosine transform(DCT) and chaotic sequence of their respective advantages,the zerosteganography algorithm of pictures based on PCT trans form and chaotic sequence is put forward. The method hides the payload based on relationship between the cover image dct dc coefficient and the payload preprocessing encryption, instead of directly embedding payload into the cover image. The results under MATLAB environment show that the proposed algorithm has a large embedding capacity, strong robustness, and great ability to resist steganalysis analysis.

Abstract:In order to improve the efficiency of the preceding vehicle identification, a preceding vehicle identification algorithm combined Haarlike features and Adaboost algorithm was proposed. Based on massive amounts of offline training sample set, effective vehicle contour and texture characteristics was extracted, Haarlike characteristics was used to describe the goal. Adaboost machine learning algorithms was used to trained classifier, the sample characteristics of cascade classifier was built, and the test object was used to detect the vehicle existence. The experimental result shows that the algorithm based on Haarlike features and Adaboost algorithm in the paper has a high detection rate of above 91%, and average detection speed of 28 ms, it can well adapt to the uncertain factors such as environmental interference and vehicle type, improve the robustness of the preceding vehicle detection, also meet the requirement of the safe driving in the longitudinal dimensionality.

Abstract:In traditional monocular visual odometries, there are many false match points, low match accuracy, large amount of computation during the feature extraction process of the traditional monocular visual odometry. This paper presents an improved monocular visual odometry model based on the SURF algorithm. The feature points between two adjacent frames are detected and matched with the SURF algorithm. The RANSAC algorithm is applied to remove the error feature points. Then, the rotation matrix R and shift vector T between two adjacent frames are calculated to accomplish the motion estimation. The experiment results show that the computing speed is accelerated by 11.2% and 10.38% in the curve motion and the straight motion, respectively, with the proposed visual odometry estimating model.

Abstract:To solve the difficult problem of microwave amplifier hot network parameters measurement, advantages and disadvantages of the traditional loadpull method and the cold measuring method by VNA are analyzed, and a method of microwave amplifier hot network parameters measurement at output port based on dualsource VNA is given. By setting the two source of a VNA to keeping the tiny offset of working frequency and testing frequency, the hot network parameters at output port can be measured directly with a traditional dual port calibration. Matters needing attention are given, and the method has been applied to the domestic VNA products.

Abstract:in the sensors used for path recognition in intelligent robot, the laser sensor is widely used because of its high precision and strong realtime. In this paper, for the intelligent vehicle which needs to recognize the black and white path, a set of 18 laser sensors were designed. And in sensor placement and path identification, these laser sensors were divided into 3 teams for time sharing multiplexing, and different values were assigned for different black wire positions. Then for different values, the desired pulse values for steering engine and current pulse values were debugged. With the difference of these two pulse values, the error was obtained. Thus PD control was adopted. Finally, it was shown by practical debugging that this layout of sensors, path identification and processing method can effectively identify the road information, and make the direction control accurate and smooth.

Abstract:Currently, the stable optical interference type methane detector performance, long life, but due to manual reading, the low degree of automation, before the test, in order to prevent the emergence of large temperature changes in pressure calibration zero drift, scale values and must be Location temperature measured close to the inlet Lane, pinch release methane suction ball cleaning chamber, then zeroing. This device is not intuitive readings, human error is large enough to hold the data. Based on this, the use of image analysis and information processing, is proposed as a photoelectric conversion element using CMOS noncontact measurement, CMOS output signal after analogdigital conversion become highspeed digital image data to achieve CMOS digital image data by the DSP collection, storage, and image data for interference analysis algorithms, and ultimately to achieve highprecision measurement of methane concentration.

Abstract:The navigation computer is designed for initial alignment and navigation computing in strapdown inertial navigation system (SINS). It is the key part of system, and it is made up of chips with high performance and accuracy. By using DSP and FPGA technology, the circuit of navigation computer is designed. Through sequence control and program design, the problems of DSP bootloading, communication, pulse signal counting and navigation computing are solved. According to longtime experimental test, the result shows that the computing error is less than e-10 and speed error is less than±0.5 m/s. The maximum radial error is 0.490 8 nm. And the navigation accuracy is 0.5 nm in 24 hours. The circuit suits the demand of realtime and accuracy for navigation computing. Therefore it is important to navigation system.