Abstract:The gray wolf algorithm has the advantages of simple structure, clear concept, easy implementation, good global performance, etc., but it has the disadvantages of slow convergence and weak local search ability in the later period. In order to improve the accuracy and rapidity of the fault location of the distribution network, the grey wolf optimization algorithm is improved. First of all, because the network fault location method can represent the problem as 0~1 integer programming problem, the conversion function is introduced to solve the problem of location update in binary space. Then the dynamic weight strategy is introduced to balance the global search capability and local search capability of the algorithm and accelerate the convergence speed of the algorithm. Finally, a probabilistic perturbation strategy is added to avoid premature local convergence of the algorithm. In this paper, the feasibility and efficiency of the improved binary grey wolf optimization algorithm are verified by an example.

Abstract:In the process of longdistance electromagnetic signal transmission, atmospheric scattering will have a negligible effect on microwave transmission. In order to analyze this effect quantitatively, the turbulent atmospheric structure constant of the microwave section is obtained on the basis of the structure of atmospheric turbulence, and the humidity and temperature are considered simultaneously. Then the turbulence atmospheric scattering model is established based on the statistical random theory. The effect of atmospheric turbulence on the microwave transmission is simulated and analyzed by the parabolic equation. The simulation results show that the scattering effect caused by atmospheric turbulence tends to be obvious in the over the horizon. With the increase of the propagation distance, the amplitude of the field intensity along the propagation direction fluctuates randomly, and the atmospheric scattering effect will weaken with the increase of height.

Abstract:In order to reduce the damage of the ferromagnetic resonance overvoltage caused by resonance to the insulation of electrical equipment, this paper proposes a new type of distribution network device and control based on the reactive power compensation device and the reactive power compensation and harmonic elimination function integration. The method, through MATLAB/Simulink simulation software, verifies that the new control method can suppress the resonant overvoltage, and further analyzes and draws the conclusion based on the original reactive power compensation equipment by constructing a simple distribution network analog line and reactive power compensation equipment. By adding a zerosequence control path, a common mode voltage or a common mode current of a certain frequency and amplitude can be injected into the distribution network, thereby realizing the resonance overvoltage suppression function.

Abstract:For the problem of the signal distortion of active sonar signal source output signal, a compensation method of signal source based on the wave filter was proposed. First the nonlinear transfer function of power amplifier was acquired. Then the wave filter was constructed via the nonlinear transfer function. Finally, the output signal source signal without distortion was corrected according to the wave filter. Theoretical analysis and experimental results show that, under the condition of this paper experimental, the method can effectively solve the problem of the signal distortion of active sonar signal source output signal, improve the robust of signal source output signal in active sonar, and the estimation accuracy of frequency bandwidth is improved more than 40%.

Abstract:Based on the electricity information acquisition system, the realization of water, gas and heat information acquisition is of great significance to the construction of smart city. This paper presents a power information acquisition system based on fourtable data acquisition. Firstly, the architecture of the electric information acquisition system and the communication technology of electricity, water, gas and heat are proposed. Then, the scheme of constructing the fourtable set copying system is studied. This paper analyzes the collection scheme, feasibility analysis, networking technology and function of the system. In addition, a fuzzy analytic hierarchy process (AHP) is used to comprehensively evaluate the constructed fourtable set copying system. Finally, the construction of the fourtable collecting and copying system was carried out in a district of fujian, and the economic benefit analysis was carried out. The fuzzy comprehensive evaluation method was adopted to calculate the weight of each index, and the final comprehensive evaluation was conducted. The results show that the performance of the modified fourmeter system is greatly improved compared with that before the reform, which proves the practicability of the fourmeter system.

Abstract:For the practical issue of multisensor data fusion in target tracking, this paper combines the predicted values and the measured values weighted together. The optimal weight allocation method of Containing predicted values and measured values is presented. This method is equivalent to adding a sensor, which theoretically improves the accuracy of the fusion. At the same time, the maneuvering frequency function is established based on the firstorder difference vector of adjoining times and the current statistical model is improved. This change can improve the tracking effect. The measured results show that the maneuvering frequency function of this paper has a good performance on the tracking targets and the method combining with the measured values and predicted values is superior to the optimal weight allocation method of standard.

Abstract:Guide to the expression of uncertainty in measurement (GUM) is not suitable for uncertainty evaluation when the input and output variants are nonlinearly correlated or the output variant is not normally distributed. Aiming to this problem, adaptive Monte Carlo method (AMCM) is adapted for uncertainty evaluation of magnetic field radiated emissions measurement from 25 Hz to 100 kHz (RE101). At first, calculation steps for measurement uncertainty evaluation using Monte Carlo method (MCM) and AMCM are promoted. Then RE101 measurement uncertainty is evaluated by AMCM and GUM method respectively. By comparing the difference of coverage interval values of the two methods and the numerical tolerance, it is shown that the evaluation result of AMCM is more reliable, thus suitable for RE101 measurement uncertainty evaluation. The AMCM can be popularized to other electromagnetic compatibility (EMC) test items for measurement uncertainty evaluation, which improving measurement uncertainty evaluation reliability effectively.

Abstract:With the development of science and technology, sensor technology, especially magnetic sensor technology, has been more widely used in the military field. When many weapons and shells are used for longrange strikes, their own internal sensors will measure the surrounding environment variables, then the computer will control them to make more accurate strikes. In this process, the sensors will inevitably have some errors，which affects the accuracy of the military strike. Therefore,a compensation method of the thermal error based on magnetic sensor is proposed.Firstly, the thermal error drift model is designed by analyzing the thermal error of the sensor. Then the temperature sensor and the geomagnetic sensor are used measure the component data of the geomagnetism on the two sensitive axes at different temperatures, and The model derives the data for each sensitive axis after fitting the temperature drift coefficient. The simulation compares the different outputs of the magnetic sensor, and verifies that the method can effectively compensate the thermal error.

Abstract:For the impact of large scale electric vehicles connected to the micro grid, in parallel operation mode,the comprehensive optimization of operation cost of micro grid,environmental management cost and charging and discharging cost of electric vehicle user is selected as the objective function,considering the timespace distribution characteristics of electric vehicles, a scheduling scheme for orderly charging and discharging of electric vehicles under timesharing electricity price is proposed. A multiobjective economic scheduling model for micro grid system including wind, light, storage, fuel cell, micro gas turbine, electric vehicle and load was established, multiobjective firefly algorithm was used to solve the scheduling model and compared with multiobjective particle swarm optimization algorithm.Based on the MATLAB platform, a typical micro grid system is taken as an example for simulation,the scheduling period is one day,the results of an example verify the validity of the proposed scheme, model and algorithm.

Abstract:In electromagnetic haptic rendering system, the magnitude and accuracy of the electromagnetic force directly determine the performance and reality of the system. In order to verify the correctness of the magnetic element obtained by finite element simulation, a threedimension electromagnetic force measurement system based on microsensor is constructed. The relationship between the force of the magnetic element and the distance is studied by the actual coil. The experimental data show that the force of the magnetic element measured by the force measurement system is in agreement with the simulation result of the finite element analysis method. The threedimensional electromagnetic force measurement system proposed by this paper can verify the correctness of the model used by finite element analysis method, which is of great significance for promoting the development of electromagnetic haptic rendering.

Abstract:To increase the growth efficiency and quality of Hg1xCdxTe, a temperature control system for liquid phase epitaxy growth annealing furnace was designed. The system takes a programmable logic controller(PLC) as the logic controller, uses the Eurotherm Meter as the temperature control to regulate the temperature with the traic. PLC communicates with the Eurotherm meters through the Modbus protocol to collect analog data and deal with them, and then control the process of production. Useing the configuration software as the humancomputer interface to display the frame dynamically and record the data in the process of system operation. The annealing furnace is easy to operate, precise in temperature control and stable in practical application.

Abstract:For the traditional infusion device, it requires the medical staff to patrol and adjust the drip speed manually by the experience in the process of injection, existing fluid replaced or emergency found not timely and other problems. A security protection system including multiple slaves and host whose cores are ARM processor is designed, taking APP as the remote monitoring terminal. The system transmits the information such as drip speed and liquid level measured by the camera of multiple slaves to the host and APP to display orderly. The host and APP can control the servo motors on site and in the distance respectively, then the drop rate is precisely adjusted. The system can accurately detect multiple infusion devices and alarm the emergency situation timely, medical staff can set a reasonable drip speed through the host and APP. The results of experiments show that drip speed is automatically adjusted rapidly and accurately, and infusion information can be monitored in real time. The system can reduce the workload of medical staff and effectively improve the safety factor of infusion.

Abstract:In order to obtain the acceleration signal of the projectile under high overload conditions in the bore, a missileborne data acquisition system was designed. The highperformance Zynq7000 series SoC chip is selected as the control core, which combines with the programmable A/D conversion chip and large capacity Nand Flash memory, to complete the data acquisition. Through the comprehensive potting technology of the finished circuit board, the overall impact resistance of the system is improved. Through the analysis of the measured results, it is shown that the system can accurately obtain the change curves of the acceleration of the projectile.

Abstract:The performance of the actuator directly affects the closed loop comprehensive characteristics and flight safety of the UAV system.In view of the current situation that the digital actuator does not provide the bandwidth technical index and the actual demand of control law design,the principle and data processing method of bandwidth by using correlation measurement method are introduced, the design idea and scheme of using the UAV’s own equipment to integrate the actuator bandwidth test system is put forward, and the test process and precautions are summed up.Finally, the actuator is taken as an example,the frequency characteristic data obtained by the test is compared with the two standard order mathematical model of the actuator.It is found that the time delay of the measurement system leads to the phase error, and the bandwidth correction scheme of the actuator bandwidth is given. The approximate two standard order mathematical model of the actuator which is most consistent with the measured results is sought,and The bandwidth and damping ratio of the rudder under no load and load condition are obtained, It provides technical support for actuator selection and control law design optimization.

Abstract:Sensor performance has an important impact on accurate and efficient acquisition of traveling wave fault signals,to study the transmission characteristics of noncontact voltage sensors of different materials，Firstly,wavelet packet decomposition is performed on the acquired signal by wavelet packet energy spectrum method，Using matlab software to fit the different attenuation laws of the energy collected by different material sensors in the same frequency band to analyze sensor transfer characteristics;Secondly, using the matlab tool to write the calculation program of the incoming wave pulse width, judging the obvious degree of the acquired waveform according to the pulse width value and the attenuation of the original signal amplitude to judge the difficulty of signal acquisition;Finally, the accuracy of the positioning is analyzed from the perspective of positioning error;In summary, the magnesium metal sheet has good transfer characteristics in traveling wave ranging. This can provide an important reference for the selection and design of sensor materials.

Abstract:In an industrial environment, the output of a 0~20 mA analog circuit is unaffected by transmission line impedance, and remains robust against electromagnetic interferences, which lead to its widespread use. LM231 is a FrequencytoVoltage converter chip which realizes an analog output of 0~20 mA, the circuit achieves the characteristics of simple hardware and high precision. The circuit consists of a MCU which outputs a variable frequency signal, an optocoupler, a frequencytovoltage converter LM231, an amplifier and a voltagetocurrent converter. Due to thermal effects and errors in the electronic parts, the actual output of LM231 suffers deviations from the theoretical value. Such deviations can be calibrated by the least square method. By sampling a set of data from the circuit, minimizing the sum of squared deviations of sampled data, a best fit curve is obtained. It is shown that accuracy of the output is remarkably improved after this calibration process.

Abstract:Due to the large number of sensitive points of the flexible force sensitive sensor array, the output value of each sensitive point varies greatly. In order to solve the complex problem of sensor calibration, a fast calibration method based on BP neural network to establish a calibration classification model is given. The classification of sensitive points on the sensor array was calibrated. The BP neural network was used to train the classification model, and then the least squares method was used to fit each type of calibration curve. Through the validation sample, the classification accuracy of the classification model is over 98%. The experiment verifies that the calibration result of the algorithm is accurate. Calibration time is less than 1 s. The experimental results show that this method is ideal for calibration of largearea flexible force sensor, and it can be used to calibrate the flexible force sensor.

Abstract:At present, there is still a phenomenon of manual bag weighing on the modified plastic production line. In order to meet the needs of automatic loading into bags and online weighing, a set of highprecision online weighing system was designed. The system uses C8051F021 singlechip microcomputer as the main control chip of the system. The voltage signal in the material filling process is collected by two pressure sensors. Through the masterslave structure, the obtained data is transmitted to the upper computer through the serial communication interface. The PC software obtains the weight information after calibration of the sensors, and can control the charging mechanism through the host computer to achieve precise control of the charging process and improve production efficiency.

Abstract:The death of potted plants with water shortage is caused by various reasons. Based on the problem and the actual demand, a networked intelligent watering robot with multinodes is proposed and designed in the paper, which can realize to control the distributed watering of potted plants. The watering robot includes a flower watering robot body, a pot planting network wireless node and a wireless network module., which can walk automatically according to the predetermined path, and the potted plants are selected to watering, which improve the efficiency of the watering robots; the actual humidity of the potted plants are according to the wireless measurement and realtime transmission, which improve the realtime of the flowers watering. Automatic watering ensures the needs of each pot, and quantitative and ondemand watering can save water resources, realize the unmanned management, which play a role in environmental protection and energy saving. The multinodes wireless controls improve the efficiency of watering robots, and reduce the piping layout, resource conservation.

Abstract:When measuring turbine vibration, it is difficult to accurately measure small displacement because the sensor head is inconvenient to install and the signal is vulnerable to electromagnetic interference in traditional measurement methods. Optical fiber displacement sensor has the characteristics of small volume and being not affected by electromagnetic environment. Through the photoelectric conversion and signal conditioning amplifier it realizes online measurement of steam turbine vibration signals, Combined with LabVIEW software to do curves fitting of noise signal and to do with amplitude frequency characteristics with FFT processing, it eventually obtains high precision micro displacement measurement results. The measurement system has the advantages such as antiinterference, fast measuring speed, realtime recording of data, and it can realize the function of online measurement of micro displacement, the experiment suggests the vibration measurement range of 1~500 μm, accuracy of 05%, and dynamic range <1 kHz, which can meet the needs of the steam turbine vibration test.

Abstract:Because there is a high demanding on stability and safety for highspeed railway, bridge vibration monitoring radar is designed using interferometry and phase inversion techniques. It has advantages such as simple structure, operated easily, highprecision and high accuracy. Moreover, it can measure weak vibration in mm levels. Thus, it can solve the problem of complex processes, high cost, low accuracy, and low efficiency of conventional bridge monitoring methods. In addition, it can be applied into highspeed railway bridge monitoring regions. The monitoring experiment of Cool Water Mega Bridge of BeijingTianjin intercity highspeed railway proves that the radar is effective and right. It can not only obtain the realtime deformation of the bridge vibration accurately, but also can acquire the type of bridge vibrations.

Abstract:With the rapid development of urbanization, transportation plays a very important role in people′s life. Traffic lights can enhance road traffic management, reduce traffic accidents and improve traffic conditions. They are an essential part of transportation. In order to manage the traffic order more scientifically and efficiently, labview is the software development platform and the data acquisition card is the hardware foundation to complete the design of the intelligent signal system. System through the data acquisition card I/O interface for communication, data exchange, and in accordance with the algorithm for data processing. The system can achieve the normal operation of the traffic lights, realtime monitoring of traffic conditions, and according to traffic conditions control signal light onoff time and other functions, in order to achieve the intelligent traffic signal system provides a new way.

Abstract:A high resolution temperature gradient detection system based on manned submersible is proposed in view of the small changes in the temperature gradient of the sediment in the deepsea hydrothermal area and the difficulty of the fine underwater detection. The system mainly includes the temperature gradient probe and the electronic cabin, the probe and the electronic cabin are connected with water, the probe is equipped with high precision NTC thermosensitive components, and the electronic module is equipped with the precision signal conditioning circuit, the system control unit and the lithium battery module. In this paper, the signal conditioning circuit is designed in principle, which improves the system resolution, reduces the circuit drift and misalignment, solves the problems of poor interchangeability and weak output signal of NTC thermosensitive components. The system structure is analyzed by finite element analysis, the design structure is optimized and the weight of the system is reduced. Finally, the system test is completed in the laboratory. The system uses the calibration score of 005. The NTC thermistors at the temperature range is 0~5 degrees, the resolution is 0001 degrees, and the working water depth is 2 000~4 000 meters. The underwater test was carried out on a manned submersible in the Great Jubilee hot water area of the India Ocean in Southwest China. The experimental results show that the structure of the system is reasonable and can be worked together with the manned submersible, and the temperature gradient data of the deepsea sediment in the Great Jubilee hydrothermal area have been successfully obtained.

Abstract:In order to realize the requirement of wide field of view (FOV) when used to blind zone exploration, collision warning and so on for Vehicleborne millimeter wave radar system, a broad beamwidth microstrip antenna array was designed. The planar microstrip antenna was used for basic radiating element. Antenna array was formed with 3 element to improve the gain. Antenna array was back fed with coaxial cable. With specific feed network, made the ratio of feed power was 05∶1∶05, which improved the gain and suppress the sidelobe level. In addition, the parasitic element and slot were added to the antenna array, which broaden the beam width and improved the impedance matching performance of the antenna. The antenna was verified by 3D electromagnetic simulation software HFSS. The simulation results show that the antenna array can work from 224 to 258 GHz with a maximum gain of 94 dB. The first sidelobe level is lower than -20 dB. The Eplane and Hplane halfpower beamwidth are 49°and 81°, respectively. The overall size of antenna is 175 mm×119 mm×1308 mm. It is useful for planar application and miniaturized of equipment.

Abstract:Twoway relaying (TWR) will be faced with the problem of QoS degradation because of timevarying channel when it is applied to the future applications such as aeronautical adhoc network and vehicle adhoc network. The channel model has been built which consider the correlation between two data transmission phases. The optimal power allocation (OPA) strategy to improve system performance is proposed, where minimizing the system outage probability is used as the optimization objective. The results produced by the MonteCarlo simulation show that the proposed OPA strategy can enhance the system outage performance efficiently compared with equal power allocation (EPA) strategy under different signaltonoise ratio (SNR) and different channel correlation coefficient, and more performance enhancement can be obtained with smaller channel fluctuation. Therefore the twoway relaying with OPA can be deployed in the highspeed motion environment such as aeronautical adhoc network and vehicle adhoc network.

Abstract:A substrate integrated waveguide (SIW) Hplane horn antenna with wide band and high fronttoback ratio (FTBR) was designed. In order to improve the matching condition between horn aperture and free space, an integrated solution is suggested, which is based on a semicircular dielectric substrate and a metal piece along the horn aperture. The size of the antenna is 16λ×32λ mm, the impedance bandwidth is broaden and the FTBR is improved. The simulated results show that the proposed antenna operates with 21% impedance bandwidth ranging from 228 GHz to 282 GHz with S11 below -10 dB. The FTBR is greater than 13 dB at the frequency from 23 GHz to 26 GHz. The maximum gain of this antenna can reach 122 dB and the gain which have a considerable character can keep stable in a wide frequency range. Compared with other SIW horn antennas, this antenna has a simpler structure, and it is better in terms of wide bandwidth, higher gains and FTBR.

Abstract:Turbocode has received wide attention due to excellent error correction ability and performance near to the Shannon limit. In order to satisfy the realtime requirement of decoding, the multicore parallel processing and iterative computing capabilities of Intel′s many integrated core (MIC) processor and OpenMP′s ability to automatically parallelize programs are used to decode Turbocode. Then MIC migration and parallelization are used to the CPU program. While ensuring the decoding performance, the LogMAP algorithm with the polyline approximation is used and adjusted and simplified at the code level. For the actual satellite signal, using the databased MIC multithread parallel processing mode. Compared to the CPU processing, the calculation speed of the Intel Xeon Phi Coprocessor 7120 Many Integrated Core processor has nearly 60 times improvement. What is more, it can achieve 8 Realtime processing of the burst signal.

Abstract:Aiming at the flexibility and diversity of B1C signal acquisition, the nonmatching acquisition of TMBOC signal and BOC(1,1) signal is proposed. Firstly, the mathematical model of B1C signal is established, and the principle of algorithm research is mathematically deduced. Secondly, the detection probability of signal acquisition is analyzed, and the theoretical analysis of the signaltonoise ratio loss in nonmatching acquisition is given. The B1C signal is used for acquisition analysis. The simulation shows that the BOC(1,1) signal acquisition can obtain a higher peaktoaverage ratio, while the TMBOC signal has a better peaktoaverage ratio when capturing the B1C signal pilot component, but the overall peaktoaverage ratio is reduced by about 046 dB. The research of the algorithm provides a new idea for B1C signal synchronization.