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Digital Signal Processing Based Real Time Vehicular Detection System 被引量:3
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作者 杨兆选 林涛 +2 位作者 李香萍 刘春义 高健 《Transactions of Tianjin University》 EI CAS 2005年第2期119-124,共6页
Traffic monitoring is of major importance for enforcing traffic management policies.To accomplish this task,the detection of vehicle can be achieved by exploiting image analysis techniques.In this paper,a solution is ... Traffic monitoring is of major importance for enforcing traffic management policies.To accomplish this task,the detection of vehicle can be achieved by exploiting image analysis techniques.In this paper,a solution is presented to obtain various traffic parameters through vehicular video detection system(VVDS).VVDS exploits the algorithm based on virtual loops to detect moving vehicle in real time.This algorithm uses the background differencing method,and vehicles can be detected through luminance difference of pixels between background image and current image.Furthermore a novel technology named as spatio-temporal image sequences analysis is applied to background differencing to improve detection accuracy.Then a hardware implementation of a digital signal processing (DSP) based board is described in detail and the board can simultaneously process four-channel video from different cameras. The benefit of usage of DSP is that images of a roadway can be processed at frame rate due to DSP′s high performance.In the end,VVDS is tested on real-world scenes and experiment results show that the system is both fast and robust to the surveillance of transportation. 展开更多
关键词 intelligent transportation system vehicular detection digital signal processing loop emulation background differencing
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Kravchenko atomic transforms in digital signal processing 被引量:2
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作者 V.F.Kravchenko D.V.Churikov 《Journal of Measurement Science and Instrumentation》 CAS 2012年第3期228-234,共7页
The modified atomic transformations are constructed and proved. On their basis the new complex analytic wavelets are obtained. The proof of the Fourier transforms existence in L~ and L2 on the basis of the theory of a... The modified atomic transformations are constructed and proved. On their basis the new complex analytic wavelets are obtained. The proof of the Fourier transforms existence in L~ and L2 on the basis of the theory of atomic functions (AF) are presented. The numerical experiments of digital time series processing and physical analysis of the results confirm the efficiency of the proposed transforms. 展开更多
关键词 atomic functions(AF) Fourier series space-time transforms digital signal processing(DSP)
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An acquisition system of digital nuclear signal processing for the algorithm development 被引量:3
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作者 WANG Peng ZHANG Ruanyu +4 位作者 YAN Yangyang HAO Dejian HUANG Ning WU Qingxing AN Zhu 《Nuclear Science and Techniques》 SCIE CAS CSCD 2013年第6期115-121,共7页
A principle and method of constructing the digital acquisition system is presented in this work,which is convenient for the study on the theories and algorithms of digital nuclear signal processing.The hardware system... A principle and method of constructing the digital acquisition system is presented in this work,which is convenient for the study on the theories and algorithms of digital nuclear signal processing.The hardware system of the digital acquisition system consists of front-end controller,waveform digitizer and PC workstation,on which the software system has been developed based on Visual C++under Windows environment.The alterable-frequency sampling(AFS)algorithm and the alterable-frequency trapezoidal filter(AFTF)algorithm have also been studied in the real-time environment,along with a digital nuclear spectrum acquisition system being set up based on the new algorithms and theγ-ray spectra of 241Am being shown.A useful experimental platform could be provided by this work for the successive work such as the development of global digitized nuclear measurement system and the study of digital nuclear signal processing. 展开更多
关键词 数字信号处理 数字采集系统 研究开发 算法 WINDOWS环境 波形数字转换器 可变频率 前端控制器
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New WA-system of kravchenko functions in digital signal processing 被引量:1
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作者 V F Kravchenko D V Churikov 《Journal of Measurement Science and Instrumentation》 CAS 2012年第4期345-351,共7页
On the basis of modified atomic transformations the new WA-systems of Kravchenko functions are constructed.As an example the digital processing of time series of the various physical nature processing is considered.Th... On the basis of modified atomic transformations the new WA-systems of Kravchenko functions are constructed.As an example the digital processing of time series of the various physical nature processing is considered.The numerical experiments and physical analysis of the results confirm the efficiency of the proposed WA-systems of Kravchenko functions. 展开更多
关键词 atomic functions WA-systems of functions WAVELETS digital signal processing(DSP)
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A beam position measurement system of fully digital signal processing at SSRF 被引量:3
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作者 YAN Han ZHAO Lei +7 位作者 LIU Shubin CHEN Kat WU Weihao AN Qi LENG Yongbin YI Xing YAN Yingbing LAI Longwei 《Nuclear Science and Techniques》 SCIE CAS CSCD 2012年第2期75-82,共8页
This fully digital beam position measurement instrument is designed for beam position monitoring and machine research in Shanghai Synchrotron Radiation Facility. The signals received from four position-sensitive detec... This fully digital beam position measurement instrument is designed for beam position monitoring and machine research in Shanghai Synchrotron Radiation Facility. The signals received from four position-sensitive detectors are narrow pulses with a repetition rate up to 499.654 MHz and a pulse width of around 100 ps, and their dynamic range could vary over more than 40 dB in machine research. By the employment of the under-sampling technique based on high-speed high-resolution A/D conversion, all the processing procedure is performed fully by the digital signal processing algorithms integrated in one single Field Programmable Gate Array. This system functions well in the laboratory and commissioning tests, demonstrating a position resolution (at the turn by turn rate of 694 kHz) better than 7 μm over the input amplitude range of -40 dBm to 10 dBm which is well beyond the requirement. 展开更多
关键词 上海同步辐射装置 位置测量系统 信号处理技术 光束 数字信号处理算法 现场可编程门阵列 位置敏感探测器 光源
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DIGITAL PROCESSING OF THE POLARIZATION STATE OF GEOPHYSICAL ULF SIGNALS
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作者 赵正予 《Journal of Electronics(China)》 1994年第3期262-267,共6页
In this paper, the evaluation by running window smoothing is used for the digital processing of the polarization of geophysical ULF signals. The observed signals are resolved into two orthogonal complex components so ... In this paper, the evaluation by running window smoothing is used for the digital processing of the polarization of geophysical ULF signals. The observed signals are resolved into two orthogonal complex components so that it is no longer necessary to consider the phase and amplitude of the signals simultaneously. 展开更多
关键词 ULF signal POLARIZATION state digital processing
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Description and reconstruction of one-dimensional photonic crystal by digital signal processing theory
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作者 张娟 付文鹏 +1 位作者 张荣军 王阳 《Chinese Physics B》 SCIE EI CAS CSCD 2014年第10期200-204,共5页
A method of describing one-dimensional photonic crystals (1DPCs) based on Z-domain digital signal processing theory is presented. The analytical expression of the target band gap spectrum in the digital domain is ob... A method of describing one-dimensional photonic crystals (1DPCs) based on Z-domain digital signal processing theory is presented. The analytical expression of the target band gap spectrum in the digital domain is obtained by the autocorrelation of its impulse response. The feasibility of this method is verified by reconstructing two simple 1DPC structures with a target photonic band gap obtained by the traditional transfer matrix method. This method provides an effective approach to function-guided designs of interference-based band gap structures for photonic applications. 展开更多
关键词 one-dimensional photonic crystal digital signal processing Z-TRANSFORM
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Interface Design Of Digital Platform For Bio Signal Processing
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作者 Jongsik Park Moonsu Jang Seongoo Lee 《Journal of Measurement Science and Instrumentation》 CAS 2010年第S1期129-132,共4页
Bio-sensor arrays for multi-channel recording have been developed recently and signal processing platforms for those signals have been studied actively.But it’s thereal situation which these technologies are generall... Bio-sensor arrays for multi-channel recording have been developed recently and signal processing platforms for those signals have been studied actively.But it’s thereal situation which these technologies are generally developed and studied respectively.So the interface design between recording array and signal processing platform is also an important issue to make bio-sensor signal processing system.In this paper,we proposed interface which has unique protocols to control sensor array and operate platform.There are two types of protocols in the interface.One is between sensor array and MCU in platform and the other is between MCU and board for wireless communication.Basically,each protocol has two kinds of modes(single,frame)and it can be extended if needed. 展开更多
关键词 INTERFACE bio-sensor digital platform signal processing
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Digital Signal Processing for Optical Access Networks
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作者 Jianjun Yu 《ZTE Communications》 2014年第4期40-48,共9页
In this paper, we investigate advanced digital signal process ing (DSP) at the transmitter and receiver side for signal pre equalization and postequalization in order to improve spec trum efficiency (SE) and trans... In this paper, we investigate advanced digital signal process ing (DSP) at the transmitter and receiver side for signal pre equalization and postequalization in order to improve spec trum efficiency (SE) and transmission distance in an optical access network. A novel DSP scheme for this optical super Nyquist filtering 9 Quadrature Amplitude Modulation (9 QAM) like signals based on muhimodulus equalization with out post filtering is proposed. This scheme recovers the Ny quist filtered Quadrature PhaseShift Keying (QPSK) signal to a 9QAMlike one. With this technique, SE can be increased to 4 b/s/Hz for QPSK signals. A novel digital superNyquist signal generation scheme is also proposed to further suppress the Nyquist signal bandwidth and reduce channel crosstalk without the need for optical prefiltering. Only optical cou plers are needed for superNyquist wavelengthdivisionmulti plexing (WDM) channel multiplexing. We extend the DSP for shorthaul optical transmission networks by using highorder QAMs. We propose a highspeed Can'ierless Amplitude/Phase 64 QAM (CAP64 QAM) system using directly modulated la ser (DML) based on direct detection and digital equalization. Decisiondirected least mean square is used to equalize the CAP64QAM. Using this scheme, we generate and transmit up to 60 Gbit/s CAP64QAM over 20 km standard single mode fiber based on the DML and direct detection. Finally, several key problems are solved for real time orthogonalfre quencydivisionmultiplexing (OFDM) signal transmission aml processing. With coherent detection, up to 100 Glfit/s 16 QAMOFDM realtime transmission is possible. 展开更多
关键词 digital signal processing high spectrum efficiency super-Ny-quist coherent optical transmission
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Real-Time Discrete Adaptive Control of Robot Arm Based on Digital Signal Processing
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作者 龙绪明 《Journal of Southwest Jiaotong University(English Edition)》 2008年第1期24-29,共6页
A discrete model reference adaptive controller of robot arm is obtained by integrating the reduced dynamic model of robot, model reference adaptive control (MRAC) and digital signal processing (DSP) computer syste... A discrete model reference adaptive controller of robot arm is obtained by integrating the reduced dynamic model of robot, model reference adaptive control (MRAC) and digital signal processing (DSP) computer system into an electromechanical system. With the DSP computer system, the control signal of each joint of the robot arm can be processed in real time and independently. The simulation and experiment results show that with the control strategy, the robot achieved a good trajectory following precision, a good decoupling performance and a high real-time adaptivity. 展开更多
关键词 ROBOT Model reference adaptive control (MRAC) digital signal processing (DSP) Real-time control
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Design and Construction of a Digital Multichannel Analyzer for HPGe Detector Using Digital Signal Processing Technique
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作者 Dang Hong Ngoc Quy Pham Ngoc Tuan Nguyen Nhi Dien 《Journal of Analytical Sciences, Methods and Instrumentation》 2019年第2期22-29,共8页
The outstanding advantage of digital signal processing (DSP) techniques and Field Programmable Gate Array (FPGA) technology is capable of improving the quality of the experimental measurements for nuclear radiation. I... The outstanding advantage of digital signal processing (DSP) techniques and Field Programmable Gate Array (FPGA) technology is capable of improving the quality of the experimental measurements for nuclear radiation. In this article, a compact DMCA 8 K was designed and manufactured using DSP technique based on FPGA technology. In particular, the output of the preamplifier is completely processed by digital techniques which are obtained from the analog-to-digital converter (ADC) to calculate the baseline, DC offset, energy peaks, pile up, threshold discrimination and then the form of energy spectrum. The Spartan-6 board is used as a hardware for the development of the digital multichannel analyzer (DMCA), which is equipped with the 14-bit AD6645 with 62.5 Msps sample rate. The application software for instrument control, data acquisition and data processing was written under C++ builder via the RS-232 interface. The designed DMCA system has been tested with a HPGe detector using gamma sources of 60Co and 137Cs and a reference pulser. 展开更多
关键词 Field PROGRAMMABLE Gate Arrays digital MULTICHANNEL ANALYZER INTEGRAL NONLINEARITY digital signal processing
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Adaptive and Intelligent Digital Signal Processing for Improved Optical Interconnection
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作者 SUN Lin DU Jiangbing +2 位作者 HUA Feng TANG Ningfeng HE Zuyuan 《ZTE Communications》 2020年第2期57-73,共17页
In recent years, explosively increasing data traffic has been boosting the con?tinuous demand of high speed optical interconnection inside or among data centers, high performance computers and even consumer electronic... In recent years, explosively increasing data traffic has been boosting the con?tinuous demand of high speed optical interconnection inside or among data centers, high performance computers and even consumer electronics. To pursue the improved intercon?nection performance of capacity, energy efficiency and simplicity, effective approaches are demonstrated including particularly advanced digital signal processing (DSP) meth?ods. In this paper, we present a review about the enabling adaptive DSP methods for opti?cal interconnection applications, and a detailed summary of our recent and ongoing works in this field. In brief, our works focus on dealing with the specific issues for short-reach interconnection scenarios with adaptive operation, including signal-to-noise-ratio (SNR) limitation, level nonlinearity distortion, energy efficiency consideration and the de?cision precision. 展开更多
关键词 optical interconnection digital signal processing advanced modulation formats
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Virtual Experimental Project Design in the Digital Signal Processing Course
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作者 Boyu Si Baodan Bai +1 位作者 Lijun Hao Xiaoou Li 《Journal of Contemporary Educational Research》 2021年第11期104-109,共6页
This paper proposes the design and development of virtual experimental projects in the Digital Signal Processing course,using MATLAB,Proteus,and CCS platforms to develop a library of typical experimental cases for bio... This paper proposes the design and development of virtual experimental projects in the Digital Signal Processing course,using MATLAB,Proteus,and CCS platforms to develop a library of typical experimental cases for biomedical engineering majors and discusses the design process.Based on these typical cases,this paper explores the secondary design for innovative engineering practice case teaching,which can promote students’understanding and mastery of digital signal processing theories,algorithms,and technologies in an intuitive,flexible,and efficient way;quickly build new innovative engineering case models and further cultivate students’engineering application ability as well as innovative thinking. 展开更多
关键词 digital signal processing course Virtual experiment Circuit simulation
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Measuring Absolute Delay of RNSS Signal Channel Using Digital Envelope Detection 被引量:3
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作者 崔小准 李懿 +2 位作者 武向军 陈宇 樊永军 《Journal of Donghua University(English Edition)》 EI CAS 2013年第2期114-117,共4页
The absolute delay caused by equipment of radio navigation satellite service (RNSS) signal channel must be calibrated in the application of positioning. The measurement accuracy of absolute delay will affect the posit... The absolute delay caused by equipment of radio navigation satellite service (RNSS) signal channel must be calibrated in the application of positioning. The measurement accuracy of absolute delay will affect the positioning precision of RNSS user. An absolute delay measurement technique using digital envelope detection was developed for RNSS signal transmission channel. The RNSS transmission signal of navigation satellite and the one pulse per second (1PPS)generated by satellite time keeping system were sampled synchronously. With sampling data of 1PPS,the reference point of the absolute delay can be decided at first,and then sampling data of RNSS transmission signal were truncated. The truncated data were processed using digital envelop detection algorithm to search the phase converting points of RNSS signal. Finally,the absolute delay of RNSS signal transmitting channel was calculated. Uncertainty of measurement with proposed technique is lower than 0. 2 ns as the sampling frequency is 10 GHz. 展开更多
关键词 navigation satellite signal channel delay measurement digital signal processing (DSP)
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Digital Optical Signal Amplifier Using an Er-doped Fiber Optical Bistable Device
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作者 Zhang Yuancheng Li Jixing Song Qian 《Wuhan University Journal of Natural Sciences》 CAS 1997年第1期47-51,共5页
The principle and charecteristics of verious digital optical signal amplifiers using Er doped fiber optical bistability devices have been discussed. Optical signal gain and its variation with the parameters of the de... The principle and charecteristics of verious digital optical signal amplifiers using Er doped fiber optical bistability devices have been discussed. Optical signal gain and its variation with the parameters of the devices with constant or pulse optical bias have been calculated, and the design principle of those devices has been given. 展开更多
关键词 optical bistability all optical communication digital optical signal processing
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Fuzzy Digital Filtering: Signal Interpretation
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作者 Juan C. García Infante J. Jesús Medel Juárez Juan C. Sánchez García 《International Journal of Communications, Network and System Sciences》 2011年第5期297-303,共7页
The paper makes a description of the fuzzy filter properties considering its operational principles. A digital filter interacts with a reference model signal into real process in order to get the best corresponding an... The paper makes a description of the fuzzy filter properties considering its operational principles. A digital filter interacts with a reference model signal into real process in order to get the best corresponding answer, having the minimum error at the filter output using the mean square criterion. Adding into this filter structure a fuzzy mechanism, to obtain an intelligent filtering because adaptively select and emit a decision answer according with the external reference signal changes, in order to actualize the best correct new conditions updating a process dynamically. The interpretation of the input signal level describes the operation of the reference model, to update the filter weights giving the answers approximation in accordance with the reference signal in natural form. Finally the paper shows the simulations results of the fuzzy filter into the Kalman structure using the Matlab? tool. 展开更多
关键词 digital FILTERS FUZZY Systems signal processing Estimation PROBABILITY
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Signal processing circuit of laser gyro based on FPGA and DSP
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作者 张永瑞 苏树清 +1 位作者 冉自博 刘红雨 《Journal of Measurement Science and Instrumentation》 CAS 2013年第2期158-162,共5页
This is a paper about laser gyro sign a l processing circuit which is designed based on field-programmable gate array(FPGA) and digital signal processor(DSP).Through a pre-amplifier circuit,FPGA and DSP,a weak current... This is a paper about laser gyro sign a l processing circuit which is designed based on field-programmable gate array(FPGA) and digital signal processor(DSP).Through a pre-amplifier circuit,FPGA and DSP,a weak current signal is converted and transferred,then sent to the computer to display the final results.Through the laser gyro performance te sting,the obtained results coincide with those of the existing methods.Thus th e d esigned circuit realizes the function of laser gyro signal processing. 展开更多
关键词 laser gyro signal processing field-programmable gate array (FPGA) digital signal processor (DSP) finite impulse response (FIR) filter
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Signal Value Simulation in Digital Nuclear Measurement System
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作者 Ruanyu Zhang Xiaobing Luo Qinghua Zhou Peng Wang Zurun Xu 《通讯和计算机(中英文版)》 2006年第5期94-98,共5页
关键词 数字信号处理 数字化仪控系统 核心信号 分析研究
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100 Gb/s coherent chaotic optical communication over 800 km fiber transmission via advanced digital signal processing
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作者 Yunhao Xie Zhao Yang +3 位作者 Mengyue Shi Qunbi Zhuge Weisheng Hu Lilin Yi 《Advanced Photonics Nexus》 2024年第1期20-25,共6页
Chaotic optical communication has shown large potential as a hardware encryption method in the physical layer.As an important figure of merit,the bit rate–distance product of chaotic optical communication has been co... Chaotic optical communication has shown large potential as a hardware encryption method in the physical layer.As an important figure of merit,the bit rate–distance product of chaotic optical communication has been continually improved to 30 Gb/s×340 km,but it is still far from the requirement for a deployed optical fiber communication system,which is beyond 100 Gb/s×1000 km.A chaotic carrier can be considered as an analog signal and suffers from fiber channel impairments,limiting the transmission distance of high-speed chaotic optical communications.To break the limit,we propose and experimentally demonstrate a pilot-based digital signal processing scheme for coherent chaotic optical communication combined with deep-learning-based chaotic synchronization.Both transmission impairment recovery and chaotic synchronization are realized in the digital domain.The frequency offset of the lasers is accurately estimated and compensated by determining the location of the pilot tone in the frequency domain,and the equalization and phase noise compensation are jointly performed by the least mean square algorithm through the time domain pilot symbols.Using the proposed method,100 Gb∕s chaotically encrypted quadrature phase-shift keying(QPSK)signal over 800 km single-mode fiber(SMF)transmission is experimentally demonstrated.In order to enhance security,40 Gb∕s real-time chaotically encrypted QPSK signal over 800 km SMF transmission is realized by inserting pilot symbols and tone in a field-programmable gate array.This method provides a feasible approach to promote the practical application of chaotic optical communications and guarantees the high security of chaotic encryption. 展开更多
关键词 chaotic optical communication physical layer security deep learning digital signal processing
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Two simple memristive maps with adaptive energy regulation and digital signal process verification
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作者 Feifei YANG Lujie REN +1 位作者 Jun MA Zhigang ZHU 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2024年第5期382-394,共13页
Mathematical models can produce desired dynamics and statistical properties with the insertion of suitable nonlinear terms,while energy characteristics are crucial for practical application because any hardware realiz... Mathematical models can produce desired dynamics and statistical properties with the insertion of suitable nonlinear terms,while energy characteristics are crucial for practical application because any hardware realizations of nonlinear systems are relative to energy flow.The involvement of memristive terms relative to memristors enables multistability and initial-dependent property in memristive systems.In this study,two kinds of memristors are used to couple a capacitor or an inductor,along with a nonlinear resistor,to build different neural circuits.The corresponding circuit equations are derived to develop two different types of memristive oscillators,which are further converted into two kinds of memristive maps after linear transformation.The Hamilton energy function for memristive oscillators is obtained by applying the Helmholz theorem or by mapping from the field energy of the memristive circuits.The Hamilton energy functions for both memristive maps are obtained by replacing the gains and discrete variables for the memristive oscillator with the corresponding parameters and variables.The two memristive maps have rich dynamic behaviors including coherence resonance under noisy excitation,and an adaptive growth law for parameters is presented to express the self-adaptive property of the memristive maps.A digital signal process(DSP)platform is used to verify these results.Our scheme will provide a theoretical basis and experimental guidance for oscillator-to-map transformation and discrete map-energy calculation. 展开更多
关键词 Hamilton energy Discrete memristor Self-adaptive regulation digital signal process(DSP)implementation
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