Table of Content

15 October 2019 Volume 32 Issue 10

  

Artificial Fish Swarm Algorithm Based on Multiuser Detection for Data Relay Satellite System

CHEN Xiaoguang,WU Zhilu,JIANG Xu,ZHANG Xiaojun

Electronic Science and Technology. 2019, 32(10):  1-6.  doi:10.16180/j.cnki.issn1007-7820.2019.10.001

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With the development of space technology, future relay satellite systems need to provide code division multiple access communication services for multiple user spacecraft. Therefore, multi-user detection techniques were employed to suppress the multiple access interference. In this paper, the artificial fish swarm algorithm was introduced into the multi-user detection of the relay satellite system. By simulating the preying behavior, swarming behavior and following behavior of artificial fishes, the multiple access interference was minimized iteratively. In order to speed up the convergence speed of the artificial fish swarm algorithm, the results of decorrelating multiuser detection were employed as initial values of the artificial fishes. The results showed that the bit error rate of the artificial fish swarm algorithm based multiuser detection method could approach 10 ^-6 at the SNR of 10 dB, and its performance was better than traditional multi-user detection method in terms of bit error rate, near-far effect and user capacity.

Gear Simulation Processing and Modal Analysis Based on UG Secondary Development

ZHANG Yanfei,DU Maohua,ZHANG Xiaoqin,CHENG Zheng

Electronic Science and Technology. 2019, 32(10):  7-12.  doi:10.16180/j.cnki.issn1007-7820.2019.10.002

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The traditional gear cutter design has a large amount of calculation and a long trial cycle, which is difficult to adapt to the market competition. In this paper, based on the NX software platform, the gear simulation process was realized through the combination of the secondary development method and the database technology. Based on the principle of hobbing processing, VC6.0 was used as the secondary development tool, and the seamless connection between NX interface and database was realized by using MFC data transfer technology. The modal analysis of the simulated machining gear was carried out to verify the system design. The modal analysis of the simulated gears was carried out to verify the rationality of the system design. Finally, the system construction was completed, and the simulation processing of the gear was realized.

Sparse Adaptive Compressed Sensing Channel Estimation in Millimeter Wave MIMO Systems

WANG Fengling,WU Yun,ZHI Jia

Electronic Science and Technology. 2019, 32(10):  13-16.  doi:10.16180/j.cnki.issn1007-7820.2019.10.003

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With the sparse characteristics of millimeter-wave MIMO systems, channel estimation can be transformed to the problem of sparse signal reconstruction. When solving the problem of millimeter-wave MIMO sparse channel estimation, the traditional OMP method requires the signal sparsity as a priori information, which is difficult to meet in practical systems. The StOMP algorithm was introduced in this paper. The threshold was determined according to the sparse prior information known by the signal. Combined with the dynamic threshold adjustment, a new StOMP-D algorithm was proposed to realize the sparse adaptive millimeter-wave MIMO channel estimation. The simulation results showed that compared with the traditional LS method, the performance of the proposed algorithm was significantly improved, and the performance of the OMP method with known sparsity was very close. It had obvious advantages when the sparsity was unknown.

Simulation Study of Floating Experimental Torpedo Floating Bags under the Action of Wave on the Sea Surface

QIAO Yahui,LI Shiyun,LI Lingxi

Electronic Science and Technology. 2019, 32(10):  17-21.  doi:10.16180/j.cnki.issn1007-7820.2019.10.004

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In order to more reasonably evaluate the survivability of the floating bag device of a special torpedo, a three-dimensional numerical flume was established based on the finite element method and the commercial software Fluent. The boundary wave method and the source item method were used to realize the wave-making and wave-eliminating functions of the water tank, and the wave conditions of the sea area in the operation of the lightning-floating device were simulated. On this basis, the fluid-solid coupling model of the interaction between wave and thunder floc structure was established to analyze the influence of ocean waves on the survivability of the thunder floc structure. The simulation results showed that the wave generated by the three-dimensional numerical flume had good stability and repeatability, and the position and value of the maximum stress response of the floating bag were obtained, which provided an important numerical reference for the design and improvement of the experimental torpedo with floating bag device.

Design of Hardware Platform for UWB Positioning System

LIU Qi,SHEN Feng,WANG Rui

Electronic Science and Technology. 2019, 32(10):  22-27.  doi:10.16180/j.cnki.issn1007-7820.2019.10.005

Abstract ( 473 )   HTML ( 14 )   PDF (1338KB) ( 64 )  

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A hardware platform based on UWB positioning system was designed for further studying the wireless positioning technology based on UWB. The hardware platform is based on the modular design idea, using STM32 as the main controller and communicating with DW1000 RF chip through SPI bus. The UWB RF circuit was designed layout around of DW1000, with the use of full external antenna. The hardware platform designed GPRS wireless communication mode and adopted the TOA positioning mode, and reserved the GPIO peripheral extension interface. The measured results showed that the farthest communication distance was 110 m in LOS environment, the RMSE error of 100 m in the same environment was 20.2 cm, and the positioning error in indoor NLOS environment was 20 cm, which satisfied the research needs of indoor high-precision positioning technology.

Multi-Objective Particle Swarm Optimization Based on Multi-population Dynamic Cooperation

YU Hui,WANG Yujia,CHEN Qiang,XIAO Shanli

Electronic Science and Technology. 2019, 32(10):  28-33.  doi:10.16180/j.cnki.issn1007-7820.2019.10.006

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Aiming at the complex multi-objective problems, a multi-objective particle swarm optimization algorithm based on multi-population dynamic cooperation was proposed. In this algorithm, multiple populations were set up to search independently at the same time, thereby effectively improving the search ability of the algorithm. In addition, in order to further ensure the diversity of the population, the algorithm divided the population into two sub-populations by dynamic clustering strategy, and changed the updating mode of subpopulations. Furthermore, dynamic learning samples and differential mutation were used to further prevent the algorithm from falling into local optimum. A series of standard test functions were simulated to verify the effectiveness of the algorithm on multi-objective problems. In addition, comparing the algorithm with five existing algorithms, the results showed that the algorithm has obvious advantages in diversity and convergence.

Study on Electromagnetic Properties of Fe/Cr Doped Monolayer MoS₂ Based on First Principle

QING Xiaomei,ZHEN Siqi

Electronic Science and Technology. 2019, 32(10):  34-38.  doi:10.16180/j.cnki.issn1007-7820.2019.10.007

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In this paper, the first-principle calculation shows that Cr/Fe δ-type doping was an effective method to adjust the electromagnetic properties of single MoS₂ layer. Different from ferromagnetic semi-metallicFe δ-type MoS₂, Cr and Fe alternately co-doped MoS₂ exhibited semi-ferromagnetism. The 3d orbits of Cr and Fe are strongly coupled with the p state of their nearest neighbor S. The virtual hopping between them followed the GKA rule. Therefore, the antiferromagnetic superexchanged interaction between Cr and Fe results in the ferromagnetic properties of the system. The results showed that three-dimensional doping in monolayer MoS₂ provided an effective way to generate one-dimensional spin-polarized transmission channels.

Forecast and Analysis of Tobacco Leaf Feeding Uniformity Based on Neural Network MIV Algorithm

CHEN Lin,YUAN Ruibo

Electronic Science and Technology. 2019, 32(10):  39-42.  doi:10.16180/j.cnki.issn1007-7820.2019.10.008

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In order to predict and analyze the uniformity of tobacco leaf feeding under different working conditions, a method based on MIV algorithm was proposed in this paper. The neural network training was carried out on the process parameters of tobacco leaf feeding, and the correlation between each parameter and feeding uniformity was calculated by using MIV. The key index influencing the uniformity of feeding was found, and the error was less than 5%. The key indexes that affected the uniformity of feeding were the opening of discharge, process flow, gas pressure and feed liquid flow. The discharge opening, industrial flow and feed liquid flow were negatively correlated with the feeding uniformity. The gas pressure was positively related to the uniformity of feed. The neural network obtained by MIV method was more predictive.

Method of Estimating Star Sensor Attitude Angle Deviation Based on Star Position Error

ZHANG Yong,HE Yiyang,YOU Sihai

Electronic Science and Technology. 2019, 32(10):  43-47.  doi:10.16180/j.cnki.issn1007-7820.2019.10.009

Abstract ( 247 )   HTML ( 2 )   PDF (769KB) ( 26 )  

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When the traditional arctangent method is used to estimate the attitude deviation of the star sensor, there are problems such as the large amount of calculation that affects the real-time performance of the algorithm. Aiming at these problems, a new method that directly estimates the star sensor attitude angle deviation via the star position error was proposed in this study. The mathematical relationship between the star sensor attitude angle deviation and the star position was deduced based on the measurement theory of star sensor. Furthermore, in the condition of small field of view, the simplified quantitative formula between the star sensor attitude angle deviation and the star position was obtained. The simulation results indicated that the calculation speed of the proposed method was 25% faster than that of traditional method. Besides, the calculation accuracy of the new method was greater than traditional method. Theoretical derivation and simulation experiments demonstrated that the proposed method owned advantages such as small amount of calculation, good real-time performance and high precision, indicating the proposed method had certain engineering application value.

Simulation Analysis of Electro-hydraulic Proportional Control System for Cathode Rod Pulling Out of Lead Electrolysis Based on AMESim

SONG Bo,YUAN Ruibo

Electronic Science and Technology. 2019, 32(10):  48-53.  doi:10.16180/j.cnki.issn1007-7820.2019.10.010

Abstract ( 212 )   HTML ( 4 )   PDF (948KB) ( 30 )  

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In the lead electrolysis production, the cathode conductive rod on the cathode plate is extracted and collected for reuse after the electrolysis is completed. At present, most of the manufacturers in China still take manual methods for extraction in this process. In this paper, a rapid, stable and effective cathode rod extraction equipment for lead electrolysis was designed by electro hydraulic proportional technology. Using AMESim software, three important systems of rod pulling, turnover and lifting were simulated and analyzed. The simulation results showed that the hydraulic cylinder of the rod pulling mechanism pulled out in 1.5 s and recovered in 1.5 s. The distance was 300 mm.The maximum turning angle of the turnover mechanism was 91.8° degrees, and the running cycle time was 9 s. The lifting mechanism moved intermittently in motion, falling 10 mm per time for 1.5 s. The system output at each stage was greater than the maximum demand of the equipment. The simulation results showed that the system was accurate in positioning and time control, and the output was sufficient, which could completely meet the design requirements.

Two Degree of Freedom PID Parameter Optimization Based on GA-PSO Fusion Algorithm

WU Yankai,ZHANG Wei,MA Yingman,LI Jiayang

Electronic Science and Technology. 2019, 32(10):  54-59.  doi:10.16180/j.cnki.issn1007-7820.2019.10.011

Abstract ( 268 )   HTML ( 3 )   PDF (916KB) ( 42 )  

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In industrial process control systems, the tuning of PID parameters have direct influence on the quality and efficiency of production. Aiming at the difficulty of PID parameter adjustment, an intelligent fusion algorithm combined with genetic algorithm and particle swarm optimization was proposed, and the proposed algorithm was applied to tuning parameters of two-degree-of-freedom PID controller. The algorithm introduced particle swarm optimization algorithm into the mutation operator of genetic algorithm, which fully exploited the advantages of two single intelligent algorithms and made up for the shortcomings of both. The simulation results showed that the proposed algorithm could be applied to tuning PID parameters and excellent performance index values in the process of adjusting the PID parameters. Moreover, it had better control effects on target value tracking characteristics and external disturbance suppression characteristics.

Solving the Problem of Replacement Flow Shop Scheduling Based on Improved Cuckoo Algorithm

BING Xiaofeng,TAO Yifei,DONG Yuanyuan,SUN Sihan

Electronic Science and Technology. 2019, 32(10):  60-64.  doi:10.16180/j.cnki.issn1007-7820.2019.10.012

Abstract ( 223 )   HTML ( 9 )   PDF (959KB) ( 33 )  

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Aiming at the problem of displacement flow shop scheduling under actual working conditions, the standard cuckoo algorithm was improved with the goal of minimizing the completion time. In order to improve the stability of the optimized solution and the computational accuracy of the algorithm, the proposed algorithm introduced the elimination probability into the dynamic adaptive mechanism. Besides, the proposed algorithm also introduced the local search into the differential evolution mechanism, and applied the NEH algorithm in the initial population generation. The improved cuckoo search was applied to solve the permutation flow shop scheduling problem under actual working conditions. The results showed that compared with the simulation optimization results of the standard cuckoo search, the improved cuckoo search had better stability and higher precision.

A Functional Electrical Stimulating System for Upper Limb Functional Rebuilding Based on Surface Electromyography and Communication Principle

WANG Haipeng,RUAN Weihua,WANG Lanying,CAO Cong

Electronic Science and Technology. 2019, 32(10):  65-69.  doi:10.16180/j.cnki.issn1007-7820.2019.10.013

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In this paper, a contralateral surface electromyography controlled functional electrical stimulation system was designed for upper limb motor functional rebuilding. The proposed system utilized the decoding method based on threshold and refractory period and the principle of sensor and communication. Because the output stimulus pattern was transformed from the recorded volitional sEMG activity, the system could make the force generated by stimulated limb trace the recorded limb’s motion. The prototype also had traditional FES function with surface electrode stimulation and electro-acupuncture stimulation output interfaces. The proposed system was tested in healthy subjects and the measured results illustrated that the extension torques generated by stimulated and recorded wrist joints were similarly same (correlation coefficient was 0.925 4 and RMSE was 0.184 3). The experimental results showed that the prototype could enable the volunteers to complete the reconstruction of the wrist extension function, indicating that the prototype system had important clinical significance for the rehabilitation of upper limbs.

A Method of Communication Between Embedded Configuration Touch Screen and Non-standard Communication Protocol Equipment

DING Laiwei,DONG Biao,LI Pengcheng,DU Haijiang

Electronic Science and Technology. 2019, 32(10):  70-74.  doi:10.16180/j.cnki.issn1007-7820.2019.10.014

Abstract ( 212 )   HTML ( 8 )   PDF (814KB) ( 19 )  

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Many power electronic devices adopt non-standard communication protocol, making them unable to communicate with the upper machine directly. This paper introduced a method to solve the communication problem between embedded configuration touch screen and non-standard communication protocol equipment. The method uses the script-driven development tool provided by the embedded configuration software to write the device driver of the non-standard communication protocol. Then the device driver was loaded into the embedded configuration software to realize the communication. The test results showed that the communication between embedded configuration touch screen and non-standard communication protocol equipment was correct by using the device driver, and the sampling values received by embedded configuration touch screen were right and refreshed correctly. At the same time, the instruction was sent to equipment correctly and the equipment could change its mode following the instruction.

Research on Corrosion Detection Technology of Power System Grounding Grid

YANG Benyi

Electronic Science and Technology. 2019, 32(10):  75-78.  doi:10.16180/j.cnki.issn1007-7820.2019.10.015

Abstract ( 295 )   HTML ( 15 )   PDF (655KB) ( 59 )  

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Traditional virus detection systems, network firewalls, and intrusion detection systems can only detect most of the known threats, but cannot detect potential problems in the network. To this end, the paper proposed a penetration test method based on attack graph. Firstly, considering the factors such as attack duration and attack type, the existing attack graph method was improved, and a new attack graph technique was proposed. Secondly, based on the actual application, the path, time, cost and method of the attack were based on the actual application. Based on the comprehensive considerations, the optimal attack path selection strategy of attack graph was proposed. Finally, the penetration test model based on attack graph was designed and tested. The test results showed that the penetration test algorithm could better simulate real-world attacks in the real world, and could evaluate the current state of the device, which could be applied in the actual penetration test.

Design of Cabin Environment Monitoring and Control System Based on Internet of Things

ZHANG Peng,SUN Hongyan

Electronic Science and Technology. 2019, 32(10):  79-82.  doi:10.16180/j.cnki.issn1007-7820.2019.10.016

Abstract ( 335 )   HTML ( 22 )   PDF (766KB) ( 46 )  

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The traditional cabin environment monitoring and control system was simpler and simpler in function. It was difficult to wiring because of the special environment and space problems, and it was easy to appear potential safety hazards. Therefore, the cabin environment monitoring system based on the Internet of Things technology was designed, and the intelligent monitoring system was formed by the integration of the Internet of Things technology and wireless sensor network. Real-time monitoring cabin temperature and humidity, illumination brightness, smoke concentration, video monitoring, monitoring data wireless transmission, real-time display. Through the analysis of experimental data, it was proved that the system is intelligent and accurate, and the accuracy and stability of the cabin fire alarm were obviously improved.

Electronic Identity Authentication and Comparison Device for Motor Vehicles Based on Smart Phone

SHAO Heyi

Electronic Science and Technology. 2019, 32(10):  83-86.  doi:10.16180/j.cnki.issn1007-7820.2019.10.017

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Aiming at the problem of large volume, inconvenience to carry and move of traditional vehicle identification system, this paper developed an electronic vehicle identity comparison device based on smart phone, which was composed of a portable ultra-high frequency RFID card reader, smart phone, mobile phone APP and background data server. The device made full use of the functions of smart phone shooting, data processing and communication, and cooperated with the use of micro-RFID reader. It was convenient to carry, could simultaneously completed the dual recognition of motor vehicle electronic and traditional license plate, could completed data comparison in real-time networking, low price, stable work and so on. It was very convenient for inspectors to carry and use with them, and could completed the flow of motor vehicle identity. Motion inspection, illegal investigation and punishment of violations of rules and regulations, investigation and punishment of stealing and robbing licensed vehicles.