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      Volume 23, No. 3 | 2025
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      • NIE Boyu,LIU Yong,LU Hongda,ZHU Shaoyuan,LYU Xin

        2025,23(3):189-196, DOI: 10.11805/TKYDA2024335

        Abstract:

        To address the issues of complex structure and high fabrication difficulty associated with compact multi-beam antennas in the terahertz frequency band, a terahertz Luneburg lens antenna and a partial Maxwell Fisheye(PMFE) lens antenna operating in the 355 GHz band are proposed. Both antennas use a periodic metallic bed-of-nails structure to realize a gradient refractive index surface wave lens with a minimum structural dimension of 60 μm. To regulate the beam direction in the non-scanning plane, corrugated rings are loaded on the edges of the surface wave lenses. In addition, the waveguide feeding array and the surface wave lens are designed as one piece to ensure structural integrity. High-precision 3D printing(10 μm precision) combined with magnetron sputtering are employed to realize the metallization of two surface wave lenses and low-cost realization of terahertz antenna prototype. The simulated results show the beam scanning capability of ±60° and ±72° for the Luneburg lens antenna and PMFE lens from 350 GHz to 360 GHz, respectively. The Luneburg lens antenna is verified by prototype fabrication and testing, which demonstrates good impedance matching and multibeam scanning performance from 350 GHz to 360 GHz, with a beam scanning range of ±60°, a gain higher than 16 dBi, and a beam-scanning loss better than 1.2 dB. The agreement between the measured and simulated results demonstrates the feasibility of this scheme and provides a new design idea and technology choice for the realization of terahertz multibeam antenna design.

      • ZHOU Xu,YANG Chuang,LIU Zile,PENG Mugen

        2025,23(3):197-201, DOI: 10.11805/TKYDA2024337

        Abstract:

        Facing the growing performance requirements of future mobile network application scenarios, Terahertz(THz) Integrated Sensing and Communication(ISAC) technology, with its advantages of high-speed communication and high-precision sensing, has become a current research hotspot.Existing research has largely focused on the performance analysis, waveform design, and system architecture of THz ISAC, with a lack of studies on the channel propagation characteristics of THz ISAC. To address this, a typical indoor laboratory scenario is selected, and a time-domain measurement system based on pseudo-random sequences is established to measure the indoor THz ISAC channel at 140 GHz band. Channel parameters such as path loss are analyzed based on the measurement data. The analysis results indicate that in the indoor scenario, the abundant scatterers are shared by both the communication and sensing channels. They not only appear in the results of sensing echoes but also contribute to the emergence of potential communication multipath components.

      • HAN Jiayue,HE Danping,DUO Hao,CHEN Ben,GUAN Ke,DOU Jianwu

        2025,23(3):202-213, DOI: 10.11805/TKYDA2024406

        Abstract:

        Multiple Input Multiple Output Synthetic Aperture Radar(MIMO SAR) imaging systems use multiple channels to obtain multi-directional information about humans, which is suitable for human security scenarios. However, in THz MIMO SAR imaging systems, due to the large number of antenna elements, how to balance the accuracy and computational efficiency of the echo signal model becomes a key challenge. A cylindrical synthetic aperture is employed to irradiate the human to obtain the echo signals, and these echo signals are processed by using the Polar Format Algorithm(PFA) to achieve THz 3D human imaging. The computational efficiency and imaging results of two different echo signal models, the Physical Optics(PO) algorithm and the Ray Tracing(RT) method, are compared by simulation for computing a Perfect Electric Conductor(PEC) material-human body. The results show that the PO algorithm using Graphics Processing Unit(GPU) acceleration performs well in terms of computational efficiency and imaging quality, with less than one hour of computation time to compute the entire cylindrical synthetic aperture echo signal, and the imaging results clearly reproduce the shape of the hazardous object. In addition, the PO algorithm also performs well in calculating echo signals that match the actual material of the human body. The effect of directional antennas with different lobe widths on the imaging results is also explored. This provides a more accurate and efficient echo signal model for future validation and optimization of imaging algorithms.

      • SU Yue,LI Da,LIU Jiacheng,CUI Jiayuan,SUN Houjun,MA Jianjun

        2025,23(3):214-224, DOI: 10.11805/TKYDA2024523

        Abstract:

        With the development of 6G networks, in-depth research on the propagation characteristics of terahertz(THz) channels in urban environments is crucial for designing efficient, reliable, and secure communication systems. The impact of different types of building corners (including acute, right, obtuse, and curved angles) on the transmission of THz channels and their physical layer security are systematically investigated through a combination of theoretical analysis, numerical simulation, and experimental measurement. The experiments are conducted by using a THz channel measurement system at three frequencies: 140 GHz, 225 GHz, and 320 GHz. Theoretical analysis is performed by using numerical simulations and knife-edge diffraction models. The research findings reveal the effects of corner structures on the propagation of THz waves, including diffraction and reflection phenomena, as well as the impact of frequency variations on these phenomena. This work provides theoretical guidance for the deployment of THz communication systems in urban environments.

      • WANG YU,SHI Lei,FU Xiaojian,JIANG Weixiang

        2025,23(3):225-230, DOI: 10.11805/TKYDA2024531

        Abstract:

        With the continuous development of 6G technology, terahertz radar and integrated sensing and communication are gradually becoming important research directions in the field of electronics and information. Programmable metasurfaces, with their advantages of being lightweight, conformable, and dynamically tunable,exhibit a high degree of freedom in terahertz beam manipulation, and thus hold significant application potential in communication, imaging, and radar. Starting from the design theory of programmable metasurfaces loaded with semiconductor components, a GaAs varactor suitable for high-frequency applications is selected, a 1 bit digital coding metasurface is constructed, and its sub-terahertz electromagnetic response and beam manipulation performance are characterized. The results show that the metasurface array has wide-angle dynamic beamforming and beam scanning capabilities in the W-band, with experimental results matching well with simulations.

      • HANG Xinqi,GUO Dalu,QIAO Linbo,GONG Hui

        2025,23(3):231-239, DOI: 10.11805/TKYDA2023418

        Abstract:

        Existing millimeter-wave radar target detection is mainly implemented based on serial processing platforms, which have certain limitations in processing speed for large-sized radar images. This paper proposes a fast millimeter-wave radar target detection structure based on a Field-Programmable Gate Array(FPGA), with a chain-type First-In-First-Out(FIFO) buffer at its core and incorporating an image extraction approach. The chain-type FIFO enables multi-frame data alignment and parallel output to obtain window edge data. Based on custom window parameters, the edge data are partitioned and summed, and then delayed and cached. This allows for the reuse of computational results before and after window movement, and in combination with a pipelined processing structure, it improves computational efficiency. By reasonably partitioning the overlapping regions of adjacent sub-images and extracting multiple small-sized sub-images from large-sized images for separate processing, the implementation speed of the radar target detection algorithm is significantly increased, and on-chip logic resources are substantially conserved. The proposed FPGA-based target detection method is validated using a Frequency-Modulated Continuous Wave(FMCW) millimeter-wave radar operating in the 92~ 94 GHz band. For a large-sized radar image of 1,000×2,000 pixels, a rapid processing time of 120 ms is achieved. The deployed FPGA algorithm consumes only thirty-two 18K BRAMs and 6 461 LUTs.

      • ZENG Youjun,ZHOU Jie,LIU Youjiang,CAO Tao,YANG Dalong,LIU Yu

        2025,23(3):240-246, DOI: 10.11805/TKYDA2023328

        Abstract:

        Unmanned Aerial vehicle ad-hoc Network(UANET) can increase the communication range by multi-hop forwarding, in which the routing algorithm undertakes the task of packet transmission path planning. To address the gain attenuation problem caused by inaccurate directional antenna beam pairing due to UAV positioning deviation in highly dynamic networks, an Ant Colony Optimization routing algorithm based on Link Quality Prediction(LQP-ACO) is proposed. The algorithm first predicts the link quality between UAV nodes using Bidirectional Gated Recurrent Unit-Fully Connected Neural Network(BiGRU-FCNN). Then, based on the predicted link quality, ant colony optimization algorithm is employed to find the two optimal paths for business data transmission. Simulation results show that the routing algorithm proposed in this paper reduces the packet loss rate by 2.75% and 4.5% respectively compared to the traditional Dijkstra's algorithm under Random Way Point(RWP) as well as Random Walk(RW) mobile models.

      • ZHANG Lianwei,LI Wenbo,ZHANG Lidong,DONG Chunxi,DONG Yangyang

        2025,23(3):247-255, DOI: 10.11805/TKYDA2023260

        Abstract:

        The identification of radiation source threat level is an important basis for interference resource allocation. Currently, the commonly used threat level judgment methods in engineering only consider a single method for indicator weighting, which has strong subjective factors and often results in unreasonable results. In response to the above issues, this article proposes a subjective and objective comprehensive weight threat level identification method based on game theory. This method utilizes four threat indicators, namely carrier frequency, pulse width, pulse repetition period and duty cycle, to establish corresponding membership functions. Using the ideas of game theory, the weights obtained from tomography analysis and entropy method are combined to obtain comprehensive weights; combining weight with membership degree, the threat level recognition results are obtained. This article analyzes the parameters of radar radiation sources in multi-environment battlefields, and the results show that using a threat level evaluation method based on game theory can provide more reasonable results compared to using only a single evaluation method, achieving good recognition results for multi-radiation source scenes.

      • LIU Jun,ZHANG Huale,FENG Bao,BIAN Yuxiang,ZHU Kehui,LI Jianfeng

        2025,23(3):256-263, DOI: 10.11805/TKYDA2023211

        Abstract:

        Aiming at the synchronization errors between distributed positioning sensors equipped with single antennas, a multi-frequency fusion Direct Positioning Determination(DPD) algorithm based on a single auxiliary source is proposed. Firstly, the received signals are segmented, and the frequency-domain data of the wideband signals are converted into a set of single-frequency signals. Secondly, the synchronization error matrix is pre-compensated using the signals received from the single auxiliary source, and this matrix is then applied to the received data from the target radiation source. Next, the subspace orthogonality relationships under multiple single-frequency signals are fused, and a minimized cost function that separates the unknown attenuation coefficients is constructed using the Lagrange multiplier method. Finally, the target area is divided into a grid, and the radiation source is estimated through peak searching of the cost function. Simulation results validate the effectiveness of the proposed algorithm. Under given parameter conditions, compared with another single-auxiliary-source-based direct positioning algorithm, the computational complexity of this algorithm is reduced by at least 86.91%, achieving better positioning accuracy under different Signal-to-Noise Ratio(SNR) and synchronization error conditions.

      • WANG Jie,YAN Liping,ZHAO Xiang

        2025,23(3):264-271, DOI: 10.11805/TKYDA2024230

        Abstract:

        The Coupling Cross Section(CCS) of aperture is an important parameter to evaluate the effect of aperture penetration. Using BP neural network to predict CCS has a much higher prediction speed than full-wave analysis and better accuracy than traditional formula methods. This paper focuses on the prediction model which can be applied to multi-shape aperture array. Three neural network models are proposed to predict the CCS of aperture array, including one traditional single-stage model and two two-stage models. Taking the regular hexagonal aperture array as an example, the performance of the three models is compared. These results show that the double-level model with the most prior information performs the best. The Root Mean Square Error(RMSE) of the CCS prediction for the regular hexagonal aperture array by this model is 0.017 2, and the coefficient of determination(R) is 0.999 1. When this model is transferred, it can predict the CCS of circular and square aperture arrays, with an average relative error of 1.94% for the samples. The prediction results confirm the precision, efficiency, and universality of the model.

      • YANG Yuanpeng,WANG Wenzhuo,ZHENG Shengquan,FANG Chonghua

        2025,23(3):272-277, DOI: 10.11805/TKYDA2023265

        Abstract:

        To increase the speed of calculating the Radar Cross Section(RCS) in the optimization design process for reducing the RCS of electrically large targets, a multi-layer Fully Connected Neural Network(FCNN) is trained using the results of models calculated by electromagnetic simulation software when employing heuristic algorithms for low-RCS optimization design of electrically large targets. During the optimization process, once the number of calculated models is sufficient to complete the training of the neural network, the trained neural network is employed to improve electromagnetic simulation calculations. Leveraging the faster computational speed of neural networks compared to electromagnetic simulations, the optimization design speed for low-RCS of electrically large targets is enhanced. Under the conditions of the electrically large target model selected in this paper and the optimization design using the simulated annealing method, the use of a multi-layer fully connected neural network to improve electromagnetic simulation calculations significantly increases the speed of low-RCS optimization design, reducing the required time from over 300 h to approximately 140 h.

      • LI Chenglong,LOU Wenzhong,DING Nanxi,MA Wenlong,ZHAO Fei,ZHANG Zihao

        2025,23(3):278-287, DOI: 10.11805/TKYDA2023319

        Abstract:

        The current extraction of image information is constrained by the transmission of massive data and the limitations of channel communication capabilities. To address this, a multi-layer image information extraction system has been constructed to overcome the limitations of transmission time and communication capacity. Based on information entropy theory, a multi-layer target image information extraction algorithm is established, using the minimum information entropy of image-based sensor information as input. By combining image feature engineering, the algorithm enhances the feature extraction and inference of images. It also utilizes sensor image data to extract the minimum volume of key information from images. Experiments have verified that this algorithm can increase the image information compression ratio to 106 without losing complete and effective information. This effectively solves the problem of real-time and reliable long-distance image information transmission with low data volume and low bandwidth.

      • FAN Wenjing,SUN Jianfeng,HUO Chengxin,GAO Yang,LI Yibiao

        2025,23(3):288-294, DOI: 10.11805/TKYDA2023279

        Abstract:

        To avoid the phenomenon of significant load differences in dedicated transformer acquisition terminals affecting their operational stability, an Adaptive Load Balancing(ALB) algorithm for dedicated transformer acquisition terminals based on a dynamic coordinate transformation algorithm is proposed. The load information of the dedicated transformer acquisition terminals is collected using a distributed information acquisition method, and the collected load information is quantitatively processed through a centralized migration method. By combining the weighted average algorithm with the bilinear interpolation of the residual of the dedicated transformer acquisition terminal nodes, new coordinates for the dedicated transformer acquisition terminals are obtained through dynamic coordinate transformation. Based on the coordinate positions of the dedicated transformer acquisition terminals, a star structure is established for each terminal node. Combined with the collected load information, the relationship between the load and the load transfer threshold is employed to determine whether the load of the dedicated transformer acquisition terminal nodes is balanced. When the load is unbalanced, it is necessary to identify overloaded nodes and establish a backup node table based on a binary tree to transfer the load from the overloaded nodes to the backup nodes, thereby achieving adaptive load balancing of the dedicated transformer acquisition terminals. Experimental results show that the application of this algorithm can effectively alleviate the pressure on overloaded nodes and achieve a balanced load state for the dedicated transformer acquisition terminals. The coordinate transformation error is relatively small. It can effectively reduce the response time for load balancing of the dedicated transformer acquisition terminals, enhance throughput, and improve load balancing performance, resulting in a good load balancing effect.

      • FENG Xinglong,HAN Rongjie,LAI Yibo,LYU Bin,LOU Yinan

        2025,23(3):295-301, DOI: 10.11805/TKYDA2023329

        Abstract:

        The problem of large power loss rate exists both in the design of distribution network route structure and in the layout of outlets. In order to reduce the power loss of the distribution network and continuously improve its power quality, the active power adjustment method of distribution network group-controlled station area based on Automatic Voltage Control(AVC) technology is studied. Based on the equivalent load of distribution network line operation, the unbalanced power component of distribution network group-controlled station area is defined; the negative sequence component and positive sequence component are divided according to the dynamic command corresponding to the operation mode, and the power regulation function of distribution network group-controlled station area is determined under different differential gain conditions; according to the regulation function and the ranges of the different parameters, the regulation mode is determined based on the AVC technology, and the power quality of distribution network group-controlled station area is improved by AVC technology. According to the regulation function and the range of different parameters, the regulation mode is determined based on AVC technology to actively regulate the unbalanced power of distribution network group-controlled stations, and the method design is completed. Taking several public stations in the distribution network as the test object, and by adjusting the reactive power compensation capacity of each group of stations, the compensation capacity can reach up to 580 kVA. It indicates that the proposed method can realize the active regulation of the power capacity, meeting the operational standards of distribution network lines and demonstrating practical application value.

      • YUAN Xin,WEI Feng

        2025,23(3):302-307, DOI: 10.11805/TKYDA2023294

        Abstract:

        When college students are under excessive psychological stress, they may experience severe psychological problems, necessitating effective methods to predict their mental health development. Based on this, the prediction algorithm is studied for the deviation trend of college students' mental health development. By quantifying college students' psychological data through weighted association rules and characterizing the development trend of psychological data using a multi-edge neighborhood matrix, the prediction of the deviation in the mental health development trend of college students is achieved based on the autocorrelation function, completing the design of the prediction method. Experimental results show that, using different stress events as test content affecting the mental health development of college students and comparing predictions through mean absolute error, mean squared error, and root mean squared error, the new method can achieve trend prediction with minimal error, with error values all below 0.1. This method can ensure an accurate judgment of the mental health development of college students and has practical application value.

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      The "In Press" section displays the articles officially accepted after peer review. These articles are currently under copyediting process without volume/issue information, but are citable according to their Digital Object Identifiers(DOI).

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        • LIN Jia-sen,LI Zhi,LI Qiao-feng,MA Yi-sen

          2012,10(1):22-26, Doi:

          Abstract:

          Effective choice of the solution is essential to achieve a real-time, bi-directional(full- duplex) communication of the smart grid. The Power Line Carrier(PLC) technology provides a low-cost solution, which suits China's own national conditions. In this paper, the advantages of OFDM PLC modulation technology are introduced. A PLC module of system model is established through the analysis of the input impedance under the low-voltage power line channel. The high-speed PLC module based on low-voltage Power Line is also designed according to the studies of power line channel. The results show that the design of the PLC module has featured high receiving sensitivity and anti-noise ability.

        • WANG Yi,LIAO Xiao-ju,PAN Ze-you

          2011,9(1):7-11, Doi:

          Abstract:

          With the development of Internet applications, users’ demand for bandwidth is soaring sharply. Meanwhile,along with the development of broadband access technology, the endpoint can also adopt multiple network accesses. But due to one-way communication of traditional Transmission Control Protocol(TCP),the waste of resources will exist. To this end,IETF has specifically proposed Multi-Path TCP(MPTCP) to implement TCP multiplexing,thereby enhancing the efficiency and robustness. This paper gives a review of the IETF’s research on MPTCP,including MPTCP architecture, routing and congestion control, aiming to provide a reference for deeply studying.

        • WANG Xiao-xia,CHEN Lian,LI Xin-yao

          2010,8(5):569-572, Doi:

          Abstract:

          Traditional methods and instruments are not able to measure the true Root Mean Square(RMS) of distortion sine wave or non-sine signal accurately. This article introduces a method to measure the true RMS of any high frequency signal by using the true RMS measurement IC,AD536A,designed by AD corporation. The paper analyses the difference between the RMS measured by the average measure method and the true RMS in theory. It explains the disadvantages of current RMS measure method,and presents the design of true RMS measure circuit. The experiment results prove that the proposed method and circuit can measure the true RMS of any high frequency signal accurately.

        • WANG Bo,ZHANG Yan

          2015,13(1):1-12, Doi: 10.11805/TKYDA201501.0001

          Abstract:

          Terahertz(THz) optoelectronics has promoted the development of the THz generation, transparent control, and detection methods,and hastened many devices in the past decades. Especially, THz metamaterials and metasurfaces will exhibit extraordinary electromagnetic response when the subwavelength scale metal structure is excited by the THz illumination. Therefore, they have been applied to the devices such as wave beam shaper, waveguide, and modulator etc. The THz metamaterials and metasurfaces also show the potential applications in the research fields such as sensors, communications, and radars. In this paper, the works about the spectrum and wavefront modulation with THz metadevices carried out in our group are summarized. The basic theory and corresponding experiment results for different devices are introduced. It is expected these works can pave the avenue of the application of the THz metadevices.

        • XIAO Yong-jian,XIAO Li,SUN Zhi-gang

          2013,11(4):583-587, Doi:

          Abstract:

          Aiming at the problems in existing underground personnel positioning systems, an assisted positioning method based on pedestrian dead reckoning is proposed. Low-cost Inertial Measurement Unit(IMU) and magnetometer are employed to constitute a stable Attitude Heading Reference System (AHRS). The theory of inertial navigation is utilized, an algorithm for step detection is described, and Zero velocity Update(ZUPT) is adopted for velocity and position estimation to compose a pedestrian dead reckoning system. An experiment is performed in the corridor of a laboratory building to emulate the underground mine road environment. The experimental results demonstrate that the dead reckoning performs well and this method is an effective complement to existing underground positioning by improving the positioning accuracy.

        • JIANG Xiao-guo,YANG Xing-lin,LI Hong,WEN Long,SHI Jin-shui,ZHANG Kai-zhi,LI Jing,WANG Yuan

          2010,8(5):573-576, Doi:

          Abstract:

          The requirements for micro stress measurement of strain gauge are high precision,high linearity,high stability and high gain. One kind of differential amplifier circuit with excellent performance was designed. Some skillful techniques were adopted to avoid common voltage in the circuit and to reduce the temperature drift. The gain linearity is about 0.01%,and its Common-Mode Rejection Ratio(CMRR) is about 129 dB under work conditions.

        • LI Mo,SUN Peng,SONG Yu,DAI Gang,ZHANG Jiana

          2015,13(1):160-168, Doi: 10.11805/TKYDA201501.0160

          Abstract:

          According to the requirements of safe, simple and nondestructive radiation effect investigation of semiconductor devices, the method of laser simulation was proposed and greatly promoted. Compared with large-scale facilities, laser simulation has various unique advantages. It helps understand the ionization radiation effect in depth and is an effective low-cost, table-top supplement for the hardness assurance. Its research shows great significance for radiation effect study in both theory and practice. In this paper, the basic principles of the interactions of γ and laser with semiconductor devices are firstly presented. Then the physical basics and characteristics of laser simulation are given, with the research progress review followed. The existing problems of current research are deeply discussed providing with feasible research approaches. In the end, necessary research contents in the future are proposed.

        • ZHANG Lidong,DAI Zuoxing

          2015,13(1):31-34, Doi: 10.11805/TKYDA201501.0031

          Abstract:

          The background requirements of the fuze antenna in terahertz spectrum as well as its advantages and disadvantages are introduced. The working principles and application characteristics of dielectric lens antenna in terahertz frequency are analyzed in order to implement the terahertz fuze antenna. The longitudinal size of H plane horn antenna can be reduced effectively by using fuze antenna formed by an H plane horn with dielectric lens antenna. The terahertz fuze antenna with different beam angles is achieved by focal technology of lens. The feasibility of the technology solution is verified through simulation.

        • ZHOU Tian,YUE Yantao,XU Guanxiong,ZHANG Yangyang,JI Chunlin

          2015,13(1):76-79, Doi: 10.11805/TKYDA201501.0076

          Abstract:

          Ultra-wideband(UWB) communication shows its advantages of fast data transfer(100 Mb/s or above) in a relatively short distance(typically below 10 m) with relatively weak power consumption (energy spectrum below -41.3 dBm/MHz). Integrated with Multiple Input Multiple Output(MIMO) technology, channel capacity could be further enhanced. As a critical link in the ultrawideband communication,UWB antenna needs extra efforts in design optimization to boost the performance of the whole system. UWB antenna is defined as the antenna whose bandwidth exceeds 500 MHz or relative bandwidth greater than 20%. This paper takes the most representative Vivaldi antenna as a show case for multi-objective optimization design with statistical methods. The optimized miniaturized antenna(sized130 mm×100 mm) shows a -10 dB bandwidth of 2.4 GHz. The design method provides guidance in common wideband,multi-parameter antenna design.

        • MIAO Jiang-hong,MA Guo-ning,HE Yu-dong,YIN Liang

          2010,8(6):647-651, Doi:

          Abstract:

          The design of code tracking loop is a key sector of the realization of noncoherent spectrum spread receiver. In order to realize the code tracking in noncoherent spectrum spread receiver, an energy-normalization digital delay-locked loop was designed, the structure of the loop and the calculating procedure of loop parameters were introduced. The characteristic of noncoherent spectrum spread was analyzed first,and then the key point of the loop design was pointed out. Based on this, the design and realization methods of code loop discriminator, loop filter, early and lag code generator were expatiated. A set of specific loop parameters were introduced as well. Modelsim simulation results and FPGA actual measured data prove the precise code tracking ability of the design.

        • JIANG Xiao-ping,LI Zhong-jie,YU Xiao-feng

          2010,8(4):451-454, Doi:

          Abstract:

          Radio Frequency IDentification(RFID) series Radio Frequency(RF) card has been applied widely because of its stability,reliability and easy operation features. Aiming at multiple protocols,such as ISO14443 protocol,ISO15693 protocol and Tag-it protocol,this study proposed a new type of circuit design based on Advanced RISC Machine(ARM) for the RFID series RF card reader. The data stream encryption was implemented by using peripheral device in the operation. The system composition,working principle and work flow were introduced. Then,the detailed circuit design of the RF network and encryption hardware were presented,and the test and analysis for the design were performed. The results showed that the circuit could accurately read, write and encrypt various types of card within effective range.

        • XU Ping,QING Lin-bo,HE Xiao-hai,YANG Chao,XU Guang-hui

          2010,8(1):67-70, Doi:

          Abstract:

          The implementation of TCP/IP protocol stack on TM320DM642 platform could provide technological support for the application of multimedia embedded systems to networks. Both the function of TM320DM642 chip and the hierarchical structure of LWIP(Light Weight Internet Protocol) were analyzed. Network communications for TM320DM642 systems were implemented by the transplantation of LWIP, not by a solution scheme of NDK(Network Developer’s Kit). Testing examples verified the effectiveness of the LWIP transplanted method.

        • ZHOU Xiao-qing,LI He-sheng,TAO Rong-hui,CAI Ying-wu

          2010,8(2):211-214, Doi:

          Abstract:

          The application of CORDIC(COordinate Rotation DIgital Computing) arithmetic in solving transcendental function has become popular in modern engineering. A brief introduction of CORDIC arithmetic was given in this study. Taking the hyperbolic sine and cosine functions as examples, the method of realizing the arithmetic in FPGA was presented and simulated on ISE(Integrated Software Environment) platform. The result showed this arithmetic was of good precision and instantaneity because of using pipeline. This arithmetic has great practical value in some applications. In addition, a curve of the relationship between the iterative number and the error obtained by the Matlab simulation of the arithmetic can help designers planning the number of iterations for practical applications.

        • WANG Peng,YANG Chun,WEN Zhao-Jin

          2010,8(3):247-250, Doi:

          Abstract:

          This article introduces a new type of high speed,multi-modulated digital modulator with adjustable center frequency and bit rate features. It can realize the Quadrature Phase Shift Keying(QPSK) and 16QAM(Quadrature Amplitude Modulation) with 80 MHz center frequency and 7.936 5 MHz bandwidth. The general-purpose modulation arithmetic based on software radio,symbol mapping and the realization of pulse shaping filter are discussed. The measuring results demonstrate that the modulation scheme meets the requirements of practicability and general utilization.

        • JIA Zhuo,LIU Hao,DENG Yifeng,DENG Hong

          2015,13(1):174-178, Doi: 10.11805/TKYDA201501.0174

          Abstract:

          The Spatial Light Modulation(SLM) technology has been widely applied to the fields of threshold switch, high speed optical interconnection and optical logic operations, which demands good performance on the real-time and fast optical signal addressing. Compared with Electro-Addressing SLM(EA-SLM), Optically-Addressing SLM(OA-SLM) shows great advantages of fast speed and high resolution by parallel addressing. Nevertheless, how to achieve fast and stable optically addressing is the key point in practice. Based on ZnO thin film as a photoconductive layer, Liquid Crystal OASLM(LC-OASLM) is designed and fabricated; the modulation of the readout light intensity and phase distribution in the two-dimensional space is achieved effectively.

        • HE Xiao-dong,DING Li

          2010,8(3):313-317, Doi:

          Abstract:

          High-speed data acquisition system is an important component in modern radar signal processing. A design of high-speed data acquisition system based on band-pass sampling was presented and applied to the signal processing of wideband receiver. The Virtex Series FPGA was used as the main platform to control the high-speed ADC08D1000 for completing data acquisition, transmission,storage and signal processing. High-speed First Input First Output(FIFOs) were selected as the storage devices to implement data rate conversion. The system realized the software and hardware design,and test results verified the feasibility of the solution.

        • ZOU Xiang,QIN Linbo,HE Xiaohai,ZHANG Yuqiang,XU Shunfei

          2015,13(1):111-117, Doi: 10.11805/TKYDA201501.0111

          Abstract:

          The corresponding solutions are proposed to tackle with the disadvantages of conventional oilfield Geographic Information System(GIS), including inconvenience of Client/Server(C/S) mode operation and maintenance, being unable to perform real-time online Point of Interest(POI) rendering, being incapable of segmentation and location according to regions, etc. An oilfield information query system of Browser/Serve(B/S) framework based on AJAX+JSON+HTML5 is designed and implemented. Experimental results show that the POI real-time rendering and regional segmentation improve on their interactivities, and the experiences of users are enriched, which meets the actual requirements of oilfield development. This work has paved the way for the development of diversified network services.

        • XU Lei,TU Xuecou,WAN Chao,PEI Yufeng,KANG Lin,WU Peiheng

          2015,13(1):27-30, Doi: 10.11805/TKYDA201501.0027

          Abstract:

          A detector can achieve quick response when it is much smaller than the wavelength of the source signal in THz wave band at the expense of signal coupling capability.Therefore, an antenna is applied to collect signals in order to enhance the signal coupling capability of the detector.The properties of antenna determine the frequency response band,the sensitivity and other parameters of the detector directly. A planar-integrated antenna is adopted for signal acquisition in the Nb5N6 microbolometer detector, which is fabricated by lithography,lift-off and other processes of micro-fabrication. The Nb5N6 microbolometer is placed in the center of the planar antenna. Aiming for the center frequency of 0.32 THz, a special capacitive coupling design is proposed to improve the signal coupling capability.

        • LUO Ya,LIAO Qingmin,WANG Desheng

          2015,13(1):35-39, Doi: 10.11805/TKYDA201501.0035

          Abstract:

          A double gate setting with priority of Doppler velocity and the Extended Kalman Filter(EKF) based Multiple Hypothesis Tracking(MHT) algorithm are proposed in order to realize Multiple Targets Tracking(MTT) in High Frequency(HF) ground-wave radar, and to effectively improve the performance of MTT by using the Doppler measurement. In the EKF based MHT, parameters obtained in the EKF are adopted directly to calculate the probability of each hypothesis. A simulation scene is built, and the EKF based MHT algorithm is compared with the one which assumes that the Doppler measurement is independent from the radius measurement. Simulation results show that the double gate setting helps induce number of clutter, and the EKF-based MHT algorithm is better than the other one under dense environments of HF ground-wave radar with stronger track-catching and false-alarm-filtering ability and higher efficiency.

        • ZHANG Hao,YANG Yuhong,XIN Gang,DU Sen

          2015,13(1):142-147, Doi: 10.11805/TKYDA201501.0142

          Abstract:

          The single-channel blind separation of GMSK(Gaussian Minimum Shift Keying) mixing signals is researched. The GMSK mixing signals can not be separated by the Per-Survivor Processing (PSP) algorithm directly, therefore, linear approximation processing of the GMSK signal is considered, which enables GMSK signal to be separated by the PSP algorithm. This algorithm separates the GMSK mixing signals by maximum likelihood estimation in the joint space of the symbol sequential and the channel parameters, reserves the best path and outputs the symbol pairs to get the separated signals. Simulation results show that the bit error rate performance produced by the PSP algorithm on separating the GMSK mixing signals is slightly better than that produced by the particle filtering algorithm; and the complexity of the proposed PSP algorithm is much smaller.