ISSN 
2003 Vol. 32, No. 1
2003, 32(1): 1-4.
Abstract:
From the point view of strong detection, high resolution, low probability of intercept(LPI) and anti-jamming, searched a new type of radar signal PSK/PPM which composed of Phase Shift Keying(PSK) and Pulse Position Modulation(PPM), presented the waveform construction and deduced its Ambiguity Function(AF). Theory analysis and great amount of computer simulation indicate that this composed signal has high BT value. To single modulated signal PPM, hybrid signal PSK/PPM's BT value is enhanced Q times; to PSK signal, it's increased M times. At the same time it is easy to generate this kind of signal with even more complexity.
From the point view of strong detection, high resolution, low probability of intercept(LPI) and anti-jamming, searched a new type of radar signal PSK/PPM which composed of Phase Shift Keying(PSK) and Pulse Position Modulation(PPM), presented the waveform construction and deduced its Ambiguity Function(AF). Theory analysis and great amount of computer simulation indicate that this composed signal has high BT value. To single modulated signal PPM, hybrid signal PSK/PPM's BT value is enhanced Q times; to PSK signal, it's increased M times. At the same time it is easy to generate this kind of signal with even more complexity.
2003, 32(1): 5-9.
Abstract:
This paper discusses the inconsistency between the sum and difference channels, which will affect angle measurement if the amplitude-monopulse angle measurement technique is employed. When wide band signal is in use, the channel amplitude and phase property cannot be treated as constants, which, in fact, are variables to frequency. The amplitude and phase imbalances of monopulse sum and different channels are analyzed based on a mathematical model in which amplitude imbalance <14 dB and phase imbalance <0.27 rad. A method of calibrating amplitude and phase imbalances between the two channels is introduced along with the computer simulation results. The results prove that after calibration, the angle measurement's precision is within the system requirement.
This paper discusses the inconsistency between the sum and difference channels, which will affect angle measurement if the amplitude-monopulse angle measurement technique is employed. When wide band signal is in use, the channel amplitude and phase property cannot be treated as constants, which, in fact, are variables to frequency. The amplitude and phase imbalances of monopulse sum and different channels are analyzed based on a mathematical model in which amplitude imbalance <14 dB and phase imbalance <0.27 rad. A method of calibrating amplitude and phase imbalances between the two channels is introduced along with the computer simulation results. The results prove that after calibration, the angle measurement's precision is within the system requirement.
2003, 32(1): 10-13.
Abstract:
Through numerical simulation the XPM effects in WDM systems with different dispersion management schemes are studied. The results indicate that, to suppress XPM effects, distributed dispersion compensation is superior to lumped dispersion compensation. When adopting distributed dispersion pre compensation, under-compensation is superior while over-compensation is better when adopting post compensation.
Through numerical simulation the XPM effects in WDM systems with different dispersion management schemes are studied. The results indicate that, to suppress XPM effects, distributed dispersion compensation is superior to lumped dispersion compensation. When adopting distributed dispersion pre compensation, under-compensation is superior while over-compensation is better when adopting post compensation.
2003, 32(1): 14-17.
Abstract:
This paper introduces the mixed theory and design method of a microstrip 4th harmonic mixer worked at Ka band. The mixer mainly consists of a waveguide-to-microstrip transition, input and output filters, matching networks and an antiparallel diode pair. According to the simulation result of computer aided design software, the integrated circuit is fabricated using RF-Duroid 5880 with 0.254 mm thick and dielectric constant εr of 2.22. The conversion loss of 8.5 dB to 10.5 dB is achived with the IF fixed at 100 MHz, the RF ranged from 34.2 GHz to 35.2 GHz and the LO ranged from 8.525 GHz to 8.775 GHz in measurement.
This paper introduces the mixed theory and design method of a microstrip 4th harmonic mixer worked at Ka band. The mixer mainly consists of a waveguide-to-microstrip transition, input and output filters, matching networks and an antiparallel diode pair. According to the simulation result of computer aided design software, the integrated circuit is fabricated using RF-Duroid 5880 with 0.254 mm thick and dielectric constant εr of 2.22. The conversion loss of 8.5 dB to 10.5 dB is achived with the IF fixed at 100 MHz, the RF ranged from 34.2 GHz to 35.2 GHz and the LO ranged from 8.525 GHz to 8.775 GHz in measurement.
2003, 32(1): 18-21.
Abstract:
Thresholding methods were widely used to signal denoising. This method is nearly optimal in many signal space. But this method only suit to white noise or wideband noise and invalid to impulse noise. Based on Lee local filter, wavelet domain median filter is introduced. Typical signals were processed by the new filter and mixed noise was removed effectively.
Thresholding methods were widely used to signal denoising. This method is nearly optimal in many signal space. But this method only suit to white noise or wideband noise and invalid to impulse noise. Based on Lee local filter, wavelet domain median filter is introduced. Typical signals were processed by the new filter and mixed noise was removed effectively.
2003, 32(1): 22-25.
Abstract:
Aiming at the character of optical transport network of MAN, a solution of CWDM is put forward. Digital wrapper technology, which is used in CWDM optical transport network of CWDM, is studied. The principle and the basic structure of the digital wrapper and the basic demand for system parts are described in this article. Implantations of the hardware and software is present. At last, forecasting boldly the future of digital wrapper technology, which is used in CWDM optical transport network.
Aiming at the character of optical transport network of MAN, a solution of CWDM is put forward. Digital wrapper technology, which is used in CWDM optical transport network of CWDM, is studied. The principle and the basic structure of the digital wrapper and the basic demand for system parts are described in this article. Implantations of the hardware and software is present. At last, forecasting boldly the future of digital wrapper technology, which is used in CWDM optical transport network.
2003, 32(1): 26-30.
Abstract:
Great deals of signals obtained from field-testing have been processed in time and frequency domain with Short Time Fourier Transform and wavelet package transform techniques. On the basis of far distance seismic signal, target recognition has been made by BP neural network, the result indicates that the recognition ratio is as high as 85% on the eigenvector of wavelet package decompose, and shows that the eigenvector of wavelet package decompose has better performance.
Great deals of signals obtained from field-testing have been processed in time and frequency domain with Short Time Fourier Transform and wavelet package transform techniques. On the basis of far distance seismic signal, target recognition has been made by BP neural network, the result indicates that the recognition ratio is as high as 85% on the eigenvector of wavelet package decompose, and shows that the eigenvector of wavelet package decompose has better performance.
2003, 32(1): 31-34.
Abstract:
A new method about DC/DC converter with the matrix of switched-capacitors was present in this paper. The method was a matrix SC(M, N) arrayed M×N the group of switches and the capacitors. A clock controls the switches, and it only works in two states. In charging, input voltage Ug charge to the capacitors along the M rows. In discharging, the matrix has rotated, and the energy of the capacitors discharge to the load along the N ranks. So the voltage was been converted. A matrix SC(2, 3) of circuit was given and analyzed and simulated in the paper.
A new method about DC/DC converter with the matrix of switched-capacitors was present in this paper. The method was a matrix SC(M, N) arrayed M×N the group of switches and the capacitors. A clock controls the switches, and it only works in two states. In charging, input voltage Ug charge to the capacitors along the M rows. In discharging, the matrix has rotated, and the energy of the capacitors discharge to the load along the N ranks. So the voltage was been converted. A matrix SC(2, 3) of circuit was given and analyzed and simulated in the paper.
2003, 32(1): 35-38.
Abstract:
In order to form an optical fiber probe, the optical fiber probe profilemeter uses a singular single_mode optical fiber as the detector for transmitting and receiving light. This optical fiber probe can be used to measure the profiles and roughness of the measured surface were. In this paper, the shape and size are calculated and analyzed, the principles of measuring profile and roughness of the measured surface discussed, the construction and operating principle of the optical fiber probe profilemeter detailed. In the end, the measurement results are presented.
In order to form an optical fiber probe, the optical fiber probe profilemeter uses a singular single_mode optical fiber as the detector for transmitting and receiving light. This optical fiber probe can be used to measure the profiles and roughness of the measured surface were. In this paper, the shape and size are calculated and analyzed, the principles of measuring profile and roughness of the measured surface discussed, the construction and operating principle of the optical fiber probe profilemeter detailed. In the end, the measurement results are presented.
2003, 32(1): 39-42.
Abstract:
The new global search algorithms result from the combination of the genetic algorithms and simulated annealing algorithms. The genetic algorithms are served as the main flow of the new algorithms which involve the mechanism of simulated annealing to adjust the optimization population. Reservation strategy is used in evolution process to reserve the individuals which have good fitness. To avoid trapping in local optimum, two steps similar to mutation including inverse operation and exchanging operation were adopted during the flipping operation of simulated annealing. The experiments indicate that the new algorithms can improve the evolution speed and the abilities of seeking the global excellent result.
The new global search algorithms result from the combination of the genetic algorithms and simulated annealing algorithms. The genetic algorithms are served as the main flow of the new algorithms which involve the mechanism of simulated annealing to adjust the optimization population. Reservation strategy is used in evolution process to reserve the individuals which have good fitness. To avoid trapping in local optimum, two steps similar to mutation including inverse operation and exchanging operation were adopted during the flipping operation of simulated annealing. The experiments indicate that the new algorithms can improve the evolution speed and the abilities of seeking the global excellent result.
2003, 32(1): 43-46.
Abstract:
The paper describes the programming process of temperature and humidity smart sensors' network software. The software is designed by using Visual Basic language, Microsoft Access databases and asp technology. It is made up of two parts, the server and the terminal part, and it has realized long-distance controlling, long-distance data acquisition and long-distance data querying. The software can be well used on intranet network (including internet network with fast speed), and can also be widely applied in other long-distance control fields.
The paper describes the programming process of temperature and humidity smart sensors' network software. The software is designed by using Visual Basic language, Microsoft Access databases and asp technology. It is made up of two parts, the server and the terminal part, and it has realized long-distance controlling, long-distance data acquisition and long-distance data querying. The software can be well used on intranet network (including internet network with fast speed), and can also be widely applied in other long-distance control fields.
2003, 32(1): 47-50.
Abstract:
This paper describes a line-tracking control system of a robot. Under the control of the single-chip microcomputer subsystem, the system can collect,save and process the digital signal from the line-tracking system,then controls the stepmotor through the driving system, and with the system robot can move according to preinstalling tracking.It shows that the system has the characteristics of automatic cut-away, credibility, accuracy and high anti-disturbance ability and so on.and the system guarantees accuracy of the robot moving.
This paper describes a line-tracking control system of a robot. Under the control of the single-chip microcomputer subsystem, the system can collect,save and process the digital signal from the line-tracking system,then controls the stepmotor through the driving system, and with the system robot can move according to preinstalling tracking.It shows that the system has the characteristics of automatic cut-away, credibility, accuracy and high anti-disturbance ability and so on.and the system guarantees accuracy of the robot moving.
2003, 32(1): 51-55.
Abstract:
A new trajectory planning method for a new type parallel machine tool is proposed in this paper. This method plans trajectory in parameter space first, then the trajectory is mapped into joint space. The redundant degree of freedom of parallel machine tool is optimized with genetic algorithm, and the reciprocal of condition number of jacobian matrix is chosen as adapation degree function. Results of simulation and calculation show that this method can gain not only dexterious configuration but also steady kinematic characteristic.
A new trajectory planning method for a new type parallel machine tool is proposed in this paper. This method plans trajectory in parameter space first, then the trajectory is mapped into joint space. The redundant degree of freedom of parallel machine tool is optimized with genetic algorithm, and the reciprocal of condition number of jacobian matrix is chosen as adapation degree function. Results of simulation and calculation show that this method can gain not only dexterious configuration but also steady kinematic characteristic.
2003, 32(1): 56-60.
Abstract:
Fundamental principle, test mathematical module and implementation method are discussed based on nestification weigh testing system by using computer test and control technology. Least square decisive method is put forward which can be used for analyzing curve fit and contrasting through test data. It is confirmed that precision and stability are high by using this method.
Fundamental principle, test mathematical module and implementation method are discussed based on nestification weigh testing system by using computer test and control technology. Least square decisive method is put forward which can be used for analyzing curve fit and contrasting through test data. It is confirmed that precision and stability are high by using this method.
2003, 32(1): 61-64.
Abstract:
The paper studies the SDL language and the basic construction of the SDL system. And the SDL protocol is analyzed. SDL is recommended by CCITT, which is mainly used in telecommunication field, describing the Real-Time, intetactive and distributed doing. There are strongpoints in using SDL developing the signaling protocal system. SDL can be integrated in applications with Embeded OS VxWorks together. The results, which are useful to the telecommunications field.
The paper studies the SDL language and the basic construction of the SDL system. And the SDL protocol is analyzed. SDL is recommended by CCITT, which is mainly used in telecommunication field, describing the Real-Time, intetactive and distributed doing. There are strongpoints in using SDL developing the signaling protocal system. SDL can be integrated in applications with Embeded OS VxWorks together. The results, which are useful to the telecommunications field.
2003, 32(1): 65-70.
Abstract:
In this paper, architecture of Distributed Digital Broadcast(DDB) system is introduced first, then the difference of code standard and file format between Moving Picture Experts Group I(MPEG-1) and Moving Picture Experts Group IV(MPEG-4) is analysed, finally data sending mechanism in Digital Video Broadcast(DVB) is discussed in depth, as well as the design and implementation of video player at client side. In practice, DDB-system is of userfriendness, high efficiency, high availability, robustness and other advantages, and it is appropriate to far-ranging situations.
In this paper, architecture of Distributed Digital Broadcast(DDB) system is introduced first, then the difference of code standard and file format between Moving Picture Experts Group I(MPEG-1) and Moving Picture Experts Group IV(MPEG-4) is analysed, finally data sending mechanism in Digital Video Broadcast(DVB) is discussed in depth, as well as the design and implementation of video player at client side. In practice, DDB-system is of userfriendness, high efficiency, high availability, robustness and other advantages, and it is appropriate to far-ranging situations.
2003, 32(1): 71-75.
Abstract:
The paper has introduced Internet application situation of mobile equipment and two programming models accessing Internet, which are WAP and WWW. Having taking into account the characteristics of mobile equipment, the paper presents WML browser δ-MTB's requirements and illustrates its architecture. Then, this paper focuses on its important components' design and implement methods. The design based on embedded operating system is flexible and extendable. The paper is also helpful to other information appliance's Internet application's design.
The paper has introduced Internet application situation of mobile equipment and two programming models accessing Internet, which are WAP and WWW. Having taking into account the characteristics of mobile equipment, the paper presents WML browser δ-MTB's requirements and illustrates its architecture. Then, this paper focuses on its important components' design and implement methods. The design based on embedded operating system is flexible and extendable. The paper is also helpful to other information appliance's Internet application's design.
2003, 32(1): 76-79.
Abstract:
This paper puts forward an enhanced algorithm which associates Apriori with hash technique and transaction reduction technique. The construction and the influence to algorithm's efficiency of hash function is studied.The theory and realizable method of transaction reduction technique are also analyzed.And then the realizable steps of the foold algorithm and the enhanced algorithm are made out through an example. The result shows that the new algorithm promotes the algorithm' efficiency and at the same time improves the performance of the data mining technique through cutting down the store space.
This paper puts forward an enhanced algorithm which associates Apriori with hash technique and transaction reduction technique. The construction and the influence to algorithm's efficiency of hash function is studied.The theory and realizable method of transaction reduction technique are also analyzed.And then the realizable steps of the foold algorithm and the enhanced algorithm are made out through an example. The result shows that the new algorithm promotes the algorithm' efficiency and at the same time improves the performance of the data mining technique through cutting down the store space.
2003, 32(1): 80-84.
Abstract:
This article proposed a algorithm of the calculate architecture used for the association rule and this algorithm based on the data partition, fully uses the merits and specialties, at the same time uses controller to assign transactions randomly to resolve the data skew in the database. The algorithm is used for the example and shows the correctness and feasibility. It can be used for distribute database and most applicable for distribute calculation.
This article proposed a algorithm of the calculate architecture used for the association rule and this algorithm based on the data partition, fully uses the merits and specialties, at the same time uses controller to assign transactions randomly to resolve the data skew in the database. The algorithm is used for the example and shows the correctness and feasibility. It can be used for distribute database and most applicable for distribute calculation.
2003, 32(1): 85-88.
Abstract:
The development of Intranet structure and OOP technology has brought new concept of information administration system such as campus academic administration system, as well as the correspondent new developing technology. Based on a case study of a campus academic administration system, this paper explored the design of new system struture, and the technology approch of its developing, also summarized some key technic issues. The Object Orient Data Model and the Object-Relative Data Base System(ORDBS) was adapted in our system struture design and developing. The design process and result shows that this approch has explicit advantages to realize the system functions based on C/S and B/S struture, as well as to maitain or extend system functions.
The development of Intranet structure and OOP technology has brought new concept of information administration system such as campus academic administration system, as well as the correspondent new developing technology. Based on a case study of a campus academic administration system, this paper explored the design of new system struture, and the technology approch of its developing, also summarized some key technic issues. The Object Orient Data Model and the Object-Relative Data Base System(ORDBS) was adapted in our system struture design and developing. The design process and result shows that this approch has explicit advantages to realize the system functions based on C/S and B/S struture, as well as to maitain or extend system functions.
2003, 32(1): 89-93.
Abstract:
The Embedded System has wide application, in order to use the Graphical User Interface in different field, this paper compares with many implement methods of the Graphical User Interface based on Embedded System, combines with the characteristic of Embedded System, investigates some pivotal technologies of the GUI based on Embedded System, analyzes the difference from the GUI based on Embedded System and the one based on common system and specifies an idea and a framework of a common and transplantable Graphical User Interface System based on Embedded System. The GUI based on Embedded System made by this idea has the characteristic such as light-duty, short-resource and convenient-clip.
The Embedded System has wide application, in order to use the Graphical User Interface in different field, this paper compares with many implement methods of the Graphical User Interface based on Embedded System, combines with the characteristic of Embedded System, investigates some pivotal technologies of the GUI based on Embedded System, analyzes the difference from the GUI based on Embedded System and the one based on common system and specifies an idea and a framework of a common and transplantable Graphical User Interface System based on Embedded System. The GUI based on Embedded System made by this idea has the characteristic such as light-duty, short-resource and convenient-clip.
2003, 32(1): 94-98.
Abstract:
To change the traditional control system of dyeing wind machine from DC motor driving and autotransformer to a new model by AC motor driving VVVF and Single-Chip computer controller (SCCC) was described. By theoretical analysis to regulated object, a new control tactics and controller by take Single-Chip computer as core were obtained and developed. Under the condition of no any analog transducer such as velocity and tension, the dyeing fabric in the control system can be controlled by permanent velocity and tension automatically in order to stabilize and increase the dyeing quality o fabric. The more than two years application of control system shows obvious reliability and save on power energy.
To change the traditional control system of dyeing wind machine from DC motor driving and autotransformer to a new model by AC motor driving VVVF and Single-Chip computer controller (SCCC) was described. By theoretical analysis to regulated object, a new control tactics and controller by take Single-Chip computer as core were obtained and developed. Under the condition of no any analog transducer such as velocity and tension, the dyeing fabric in the control system can be controlled by permanent velocity and tension automatically in order to stabilize and increase the dyeing quality o fabric. The more than two years application of control system shows obvious reliability and save on power energy.
2003, 32(1): 99-103.
Abstract:
The earnings announcements are chosen as the events for testing whether China stock market overreacts to the earnings information. The winner portfolio and loser portfolio are divided according to the earning changing index. The earning change of the listed companies are considered. The cumulated abnormal returns of the portfolio 1-year and 3-year after the annual reports are tested. This paper makes an empirical test using the data of Shenzhen stock market and Shanghai stock market from 1992 to 2000. It is shown that there is no overreaction to the earnings information in relatively long period. Which is different from the foreign stock markets. The empirical results are explained by further investigating the characteristics of China stock market.
The earnings announcements are chosen as the events for testing whether China stock market overreacts to the earnings information. The winner portfolio and loser portfolio are divided according to the earning changing index. The earning change of the listed companies are considered. The cumulated abnormal returns of the portfolio 1-year and 3-year after the annual reports are tested. This paper makes an empirical test using the data of Shenzhen stock market and Shanghai stock market from 1992 to 2000. It is shown that there is no overreaction to the earnings information in relatively long period. Which is different from the foreign stock markets. The empirical results are explained by further investigating the characteristics of China stock market.
2003, 32(1): 104-108.
Abstract:
In this paper, the self-organizing pattern recognition method is presented based on the self-organizing data mining method and the principle of economy forecasting. The peculiarity of SPR differs from other pattern recognition methods is Using group method of data handing synthesizing technique in the combination of several similar patterns. This method is more convenient than common forecasting methods when applying to economy forecasting.The example shows that this method is effective in economy forecasting. At the same time, by adding samples of same type, it has solved the problem of small data samples.
In this paper, the self-organizing pattern recognition method is presented based on the self-organizing data mining method and the principle of economy forecasting. The peculiarity of SPR differs from other pattern recognition methods is Using group method of data handing synthesizing technique in the combination of several similar patterns. This method is more convenient than common forecasting methods when applying to economy forecasting.The example shows that this method is effective in economy forecasting. At the same time, by adding samples of same type, it has solved the problem of small data samples.
