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2007 Vol. 29, No. 8
Display Method:
2007, 29(8): 1779-1783.
doi: 10.3724/SP.J.1146.2006.01071
Abstract:
Considering the statistical characteristics of SAR images, a novel speckle reduction algorithm is presented in this paper. This technique is by virtue of generalized cross validation and constructs an object function to acquire the asymptotic optimal...
Considering the statistical characteristics of SAR images, a novel speckle reduction algorithm is presented in this paper. This technique is by virtue of generalized cross validation and constructs an object function to acquire the asymptotic optimal...
2007, 29(8): 1784-1788.
doi: 10.3724/SP.J.1146.2005.01689
Abstract:
In this paper, an algorithm for compressing synthetic aperture radar raw data is proposed. This algorithm is based on the combination of discrete cosine transform and block-adaptive quantization. The known results that a block normalized SAR raw sign...
In this paper, an algorithm for compressing synthetic aperture radar raw data is proposed. This algorithm is based on the combination of discrete cosine transform and block-adaptive quantization. The known results that a block normalized SAR raw sign...
2007, 29(8): 1789-1793.
doi: 10.3724/SP.J.1146.2005.01696
Abstract:
A novel method for high speed moving targets ISAR imaging based on moving reference dechirp signal is presented in this paper. Firstly target track fitting is accomplished by utilizing assistant low-resolution range measurement results and envelope a...
A novel method for high speed moving targets ISAR imaging based on moving reference dechirp signal is presented in this paper. Firstly target track fitting is accomplished by utilizing assistant low-resolution range measurement results and envelope a...
2007, 29(8): 1794-1798.
doi: 10.3724/SP.J.1146.2005.01535
Abstract:
In view of unsteadily flying, the helicopter brings about great errors to moving targets imaging, especially SAR imaging of moving ship. So this paper shows an effective method based on an idea that uses motion compensation, general second-step keyst...
In view of unsteadily flying, the helicopter brings about great errors to moving targets imaging, especially SAR imaging of moving ship. So this paper shows an effective method based on an idea that uses motion compensation, general second-step keyst...
2007, 29(8): 1799-1801.
doi: 10.3724/SP.J.1146.2006.00072
Abstract:
The problem of inherent consistency between phase compensation and Minimum Entropy Auto-focusing (MEA) method in ISAR imaging is investigated in this paper. The mathematical analysis in the paper proves the conclusion that, for ISAR range-Doppler ima...
The problem of inherent consistency between phase compensation and Minimum Entropy Auto-focusing (MEA) method in ISAR imaging is investigated in this paper. The mathematical analysis in the paper proves the conclusion that, for ISAR range-Doppler ima...
2007, 29(8): 1802-1804.
doi: 10.3724/SP.J.1146.2005.01481
Abstract:
This paper introduces a method to compensate IMU air-borne SAR platform. Because GEOSTAR system error does not increase with time, GEOSTAR system and IMU to cancel IMU system errror which increases with time. It can improve precision of IMU positioni...
This paper introduces a method to compensate IMU air-borne SAR platform. Because GEOSTAR system error does not increase with time, GEOSTAR system and IMU to cancel IMU system errror which increases with time. It can improve precision of IMU positioni...
2007, 29(8): 1805-1808.
doi: 10.3724/SP.J.1146.2005.01468
Abstract:
Ultra-wide band SAR has the capability of detecting minefield and single mine from a safe standoff distance. In this paper, an ultra-wide band SAR landmine detection experimental system，referred as Rail-GPSAR system, with its information processing t...
Ultra-wide band SAR has the capability of detecting minefield and single mine from a safe standoff distance. In this paper, an ultra-wide band SAR landmine detection experimental system，referred as Rail-GPSAR system, with its information processing t...
2007, 29(8): 1809-1812.
doi: 10.3724/SP.J.1146.2005.01474
Abstract:
The sea clutter of S-band radar shows nonlinearities and time variation of its spectrum. However, the spectrum analysis method cannot reflect the evolution of the sea clutter of S-band radar in time domain. Adopting the model of Fractional Brownian M...
The sea clutter of S-band radar shows nonlinearities and time variation of its spectrum. However, the spectrum analysis method cannot reflect the evolution of the sea clutter of S-band radar in time domain. Adopting the model of Fractional Brownian M...
2007, 29(8): 1813-1816.
doi: 10.3724/SP.J.1146.2005.01518
Abstract:
Based on the characteristics of good sparsity and capturing effectively the smooth contours in natural images for Contourlet transform, a new independent component analysis algorithm is proposed by using the block-wise Contourlet transform in this pa...
Based on the characteristics of good sparsity and capturing effectively the smooth contours in natural images for Contourlet transform, a new independent component analysis algorithm is proposed by using the block-wise Contourlet transform in this pa...
2007, 29(8): 1817-1820.
doi: 10.3724/SP.J.1146.2005.01459
Abstract:
In this paper, allied strategy is introduced into PSO and a parallel and two-stage blind signal separation based on particle swarm optimization (parallel particle swarm optimizationgradient algorithm) is proposed. This algorithm is characteristic of ...
In this paper, allied strategy is introduced into PSO and a parallel and two-stage blind signal separation based on particle swarm optimization (parallel particle swarm optimizationgradient algorithm) is proposed. This algorithm is characteristic of ...
2007, 29(8): 1821-1825.
doi: 10.3724/SP.J.1146.2005.01510
Abstract:
The research of previous palmprint identification algorithms are mainly focus on ROI districts cropped from the central part of palmprint images, but always ignore the color features like grayscale distribution. Under regular illumination, the textur...
The research of previous palmprint identification algorithms are mainly focus on ROI districts cropped from the central part of palmprint images, but always ignore the color features like grayscale distribution. Under regular illumination, the textur...
2007, 29(8): 1826-1828.
doi: 10.3724/SP.J.1146.2005.01506
Abstract:
A vision inspection technique is provided, which can be used to estimate the position and orientation of the ball and its center axis hole by its projected image. When the focus length of digital camera is given, with the size of circular and spheric...
A vision inspection technique is provided, which can be used to estimate the position and orientation of the ball and its center axis hole by its projected image. When the focus length of digital camera is given, with the size of circular and spheric...
2007, 29(8): 1829-1832.
doi: 10.3724/SP.J.1146.2006.00037
Abstract:
Detection of long range targets in thermal infrared image sequences is of interest in many applications such as military field and surveillance system. Incoming targets at long range where the motion is small and signal to noise is poor are difficult...
Detection of long range targets in thermal infrared image sequences is of interest in many applications such as military field and surveillance system. Incoming targets at long range where the motion is small and signal to noise is poor are difficult...
2007, 29(8): 1833-1836.
doi: 10.3724/SP.J.1146.2006.00100
Abstract:
Large tracking error has been found in the use of classic extended Kalman filter in LOS/NLOS hybrid environment. This paper presents a modified particle filter algorithm based on the LOS/NLOS binary state information of propagation environment using ...
Large tracking error has been found in the use of classic extended Kalman filter in LOS/NLOS hybrid environment. This paper presents a modified particle filter algorithm based on the LOS/NLOS binary state information of propagation environment using ...
2007, 29(8): 1837-1840.
doi: 10.3724/SP.J.1146.2006.00015
Abstract:
To maneuvering target tracking with multiple passive sensors in clutter environment, a novel algorithm based on particle filter is proposed. In this algorithm, the likelihood function of particle filter in clutter is derived. Then the particle filter...
To maneuvering target tracking with multiple passive sensors in clutter environment, a novel algorithm based on particle filter is proposed. In this algorithm, the likelihood function of particle filter in clutter is derived. Then the particle filter...
2007, 29(8): 1841-1844.
doi: 10.3724/SP.J.1146.2006.00104
Abstract:
A method for the recovery of JPEG compressed image sequences is proposed in this paper. The method is based on the reduction of compression artifacts, and it is inspired with the thoughts of super-resolution reconstruction. To minimize the quantizati...
A method for the recovery of JPEG compressed image sequences is proposed in this paper. The method is based on the reduction of compression artifacts, and it is inspired with the thoughts of super-resolution reconstruction. To minimize the quantizati...
2007, 29(8): 1845-1849.
doi: 10.3724/SP.J.1146.2006.00137
Abstract:
A system on the layout of objects in a 3D scene is researched and designed in the paper to realize the automatic layout. The system is based on natural language understanding and realized through two steps. Three contents are described in this paper....
A system on the layout of objects in a 3D scene is researched and designed in the paper to realize the automatic layout. The system is based on natural language understanding and realized through two steps. Three contents are described in this paper....
2007, 29(8): 1850-1854.
doi: 10.3724/SP.J.1146.2005.01471
Abstract:
For the multisensor system with unknown noise statistics, and with the measurement matrices having a same right factor, based on Weighted Least Squares(WLS) method, an equivalent fusion measurement equation is obtained. Using the modern time series a...
For the multisensor system with unknown noise statistics, and with the measurement matrices having a same right factor, based on Weighted Least Squares(WLS) method, an equivalent fusion measurement equation is obtained. Using the modern time series a...
2007, 29(8): 1855-1859.
doi: 10.3724/SP.J.1146.2006.00014
Abstract:
The methods of similarity measure between vague values (sets) in existence, some errors and limitations in some former result are analyzed. A new definition of similarity measure between values (sets) is presented, and two ameliorative similarity mea...
The methods of similarity measure between vague values (sets) in existence, some errors and limitations in some former result are analyzed. A new definition of similarity measure between values (sets) is presented, and two ameliorative similarity mea...
2007, 29(8): 1860-1863.
doi: 10.3724/SP.J.1146.2005.01480
Abstract:
The signal is done un-decimated wavelet transform using Anti-Symmetrical Biorthogonal Wavelets (ASBW). Because of the ASBWs approximate derivative property, the local maxima of the wavelet decomposition coefficients can be obtained, which is the corr...
The signal is done un-decimated wavelet transform using Anti-Symmetrical Biorthogonal Wavelets (ASBW). Because of the ASBWs approximate derivative property, the local maxima of the wavelet decomposition coefficients can be obtained, which is the corr...
2007, 29(8): 1864-1867.
doi: 10.3724/SP.J.1146.2005.01465
Abstract:
Compared with Gaussian noise, Heavy-tailed noise has more outliers, and the traditional neural network can not suppress outliers. A new neural network based on median filter is proposed. After suppressing the outliers in signal through median filter,...
Compared with Gaussian noise, Heavy-tailed noise has more outliers, and the traditional neural network can not suppress outliers. A new neural network based on median filter is proposed. After suppressing the outliers in signal through median filter,...
2007, 29(8): 1868-1871.
doi: 10.3724/SP.J.1146.2006.00117
Abstract:
A new algorithm for detecting P-wave is proposed by an adaptive QRS-T cancellation technique based on wavelet transform. In this paper, Mallat algorithm of the Marr wavelet transforms is used to prosecute multi-resolution analysis for the ECG signal,...
A new algorithm for detecting P-wave is proposed by an adaptive QRS-T cancellation technique based on wavelet transform. In this paper, Mallat algorithm of the Marr wavelet transforms is used to prosecute multi-resolution analysis for the ECG signal,...
2007, 29(8): 1872-1876.
doi: 10.3724/SP.J.1146.2005.01457
Abstract:
Combing space-time trellis codes and layered space-time codes, a new Generalized Recursive Space-Time Trellis Code(G-RSTTC) is designed for a Serial Concatenated Space-Time Code(SCSTC). Compared with SCSTC using the traditional recursive STTC as the ...
Combing space-time trellis codes and layered space-time codes, a new Generalized Recursive Space-Time Trellis Code(G-RSTTC) is designed for a Serial Concatenated Space-Time Code(SCSTC). Compared with SCSTC using the traditional recursive STTC as the ...
2007, 29(8): 1877-1881.
doi: 10.3724/SP.J.1146.2005.01656
Abstract:
In this paper, a unified model of the random impulse radio signals is presented based on the characters of a variety of UWB modulation signals. The Power Spectral Density(PSD)for the signals is carried out using stochastic theory. This PSD expression...
In this paper, a unified model of the random impulse radio signals is presented based on the characters of a variety of UWB modulation signals. The Power Spectral Density(PSD)for the signals is carried out using stochastic theory. This PSD expression...
2007, 29(8): 1882-1886.
doi: 10.3724/SP.J.1146.2005.01693
Abstract:
This paper proposes an identification algorithm for higher order QAM modulated signals based on the improved HY-NCMA blind equalization method in multi-path environments. Compared with the existing algorithms, the equalizer can recover the phase offs...
This paper proposes an identification algorithm for higher order QAM modulated signals based on the improved HY-NCMA blind equalization method in multi-path environments. Compared with the existing algorithms, the equalizer can recover the phase offs...
2007, 29(8): 1887-1890.
doi: 10.3724/SP.J.1146.2005.01464
Abstract:
A turbo equalizer is able to overcome severe inter-symbol-interferences because it benefits from the channel decoding gain by iteratively performing equalization and channel decoding. This paper proposes a scheme of turbo equalization and iterative c...
A turbo equalizer is able to overcome severe inter-symbol-interferences because it benefits from the channel decoding gain by iteratively performing equalization and channel decoding. This paper proposes a scheme of turbo equalization and iterative c...
2007, 29(8): 1891-1894.
doi: 10.3724/SP.J.1146.2006.00067
Abstract:
First, this paper analyzes the very reason of efficiency in the existing efficient architecture for wideband Digital Down Conversion (DDC) and points out some problems, and then deduces a novel method: decimation prior to filtering and synchro-tuning...
First, this paper analyzes the very reason of efficiency in the existing efficient architecture for wideband Digital Down Conversion (DDC) and points out some problems, and then deduces a novel method: decimation prior to filtering and synchro-tuning...
2007, 29(8): 1895-1899.
doi: 10.3724/SP.J.1146.2005.01707
Abstract:
A robust blind symbol-timing synchronization scheme applicable to UWB-OFDM systems is presented. The proposed method is based on ZP(Zero-padded Prefix) power collection in the UWB-OFDM symbols whose ZP average power distribute regularly in the slide ...
A robust blind symbol-timing synchronization scheme applicable to UWB-OFDM systems is presented. The proposed method is based on ZP(Zero-padded Prefix) power collection in the UWB-OFDM symbols whose ZP average power distribute regularly in the slide ...
2007, 29(8): 1900-1902.
doi: 10.3724/SP.J.1146.2006.00212
Abstract:
An algorithm of improved reduced spatial resolution video transcoding is proposed in this paper. An adaptive intra-refresh scheme is presented based on the relation between drift error and motion activity of inter-coded blocks. The thresholds are dyn...
An algorithm of improved reduced spatial resolution video transcoding is proposed in this paper. An adaptive intra-refresh scheme is presented based on the relation between drift error and motion activity of inter-coded blocks. The thresholds are dyn...
2007, 29(8): 1903-1905.
doi: 10.3724/SP.J.1146.2006.00431
Abstract:
Time-Division Duplex (TDD) and Multiple-Input Multiple-Output (MIMO) are the key techniques in the beyond third generation (B3G) mobile communication systems. In the conventional literatures on TDD, the channel state information at transmitter is obt...
Time-Division Duplex (TDD) and Multiple-Input Multiple-Output (MIMO) are the key techniques in the beyond third generation (B3G) mobile communication systems. In the conventional literatures on TDD, the channel state information at transmitter is obt...
2007, 29(8): 1906-1910.
doi: 10.3724/SP.J.1146.2005.01691
Abstract:
This paper proposes a subspace-based semiblind channel estimation method in MC-CDMA systems. Combined with the characteristic of the signal model in MC-CDMA systems, this semiblind method solves the problem of slow convergence by the initial channel ...
This paper proposes a subspace-based semiblind channel estimation method in MC-CDMA systems. Combined with the characteristic of the signal model in MC-CDMA systems, this semiblind method solves the problem of slow convergence by the initial channel ...
2007, 29(8): 1911-1915.
doi: 10.3724/SP.J.1146.2006.01512
Abstract:
Based on the performance analysis of the Orthogonal Frequency Division Multiplexing (OFDM) system, this paper proposes a scheme for sub-carrier allocation and power control in a multi-user multi-rate OFDM system. For the downlink transmission employi...
Based on the performance analysis of the Orthogonal Frequency Division Multiplexing (OFDM) system, this paper proposes a scheme for sub-carrier allocation and power control in a multi-user multi-rate OFDM system. For the downlink transmission employi...
2007, 29(8): 1916-1918.
doi: 10.3724/SP.J.1146.2006.00062
Abstract:
An improved anti-frequency-offset method by windowing in OFDM systems is proposed. The cyclic prefix added at the transmitter side is first removed at the receiver, and then a new cyclic prefix is appended, finally the new signal is windowed by a Nyq...
An improved anti-frequency-offset method by windowing in OFDM systems is proposed. The cyclic prefix added at the transmitter side is first removed at the receiver, and then a new cyclic prefix is appended, finally the new signal is windowed by a Nyq...
2007, 29(8): 1919-1923.
doi: 10.3724/SP.J.1146.2005.01569
Abstract:
A novel system based on cooperative Distributed Space-Time Block Code and Multi-Carrier Code Division Multiple Access (DSTBC-MC-CDMA) is presented which works well in multi-user wireless networks with single-antenna user in frequency selective fading...
A novel system based on cooperative Distributed Space-Time Block Code and Multi-Carrier Code Division Multiple Access (DSTBC-MC-CDMA) is presented which works well in multi-user wireless networks with single-antenna user in frequency selective fading...
2007, 29(8): 1924-1928.
doi: 10.3724/SP.J.1146.2006.00763
Abstract:
In orthogonal frequency-division multiple access (OFDMA), closely spaced multiple subcarrier are assigned to different users for parallel signal transmission. An interleaved subcarrier-assignment scheme is preferred because it provides maximum freque...
In orthogonal frequency-division multiple access (OFDMA), closely spaced multiple subcarrier are assigned to different users for parallel signal transmission. An interleaved subcarrier-assignment scheme is preferred because it provides maximum freque...
2007, 29(8): 1929-1933.
doi: 10.3724/SP.J.1146.2006.00237
Abstract:
Distributed noncooperative power control game for wireless data is considered in multiple-input multiple-output (MIMO) CDMA system. Utility functions are established for wireless data over the MIMO CDMA system. The spectral efficiency and power effic...
Distributed noncooperative power control game for wireless data is considered in multiple-input multiple-output (MIMO) CDMA system. Utility functions are established for wireless data over the MIMO CDMA system. The spectral efficiency and power effic...
2007, 29(8): 1934-1937.
doi: 10.3724/SP.J.1146.2006.00118
Abstract:
The samples of stochastic bridge processes are employed to model propagation trajectories of Multi-Path Components (MPCs) in short range wireless propagation channels. Under some specialized mapping rules, the basic random variables constructed from ...
The samples of stochastic bridge processes are employed to model propagation trajectories of Multi-Path Components (MPCs) in short range wireless propagation channels. Under some specialized mapping rules, the basic random variables constructed from ...
2007, 29(8): 1938-1941.
doi: 10.3724/SP.J.1146.2006.00038
Abstract:
Ultra-wideband communication system is generally organized in the form of Ad hoc network. In this paper, two strategies of admission controlthe throughput control on overall network or each link, are simply analyzed for Ad hoc network which uses DS-U...
Ultra-wideband communication system is generally organized in the form of Ad hoc network. In this paper, two strategies of admission controlthe throughput control on overall network or each link, are simply analyzed for Ad hoc network which uses DS-U...
2007, 29(8): 1942-1945.
doi: 10.3724/SP.J.1146.2005.01637
Abstract:
The article provides applying DSTC(Deskewed Short-Time Correlator)to code acquisition system on serious code frequency offset. Firstly, performance of acquisition system affected by code frequency offset is analyzed. Considering complication and perf...
The article provides applying DSTC(Deskewed Short-Time Correlator)to code acquisition system on serious code frequency offset. Firstly, performance of acquisition system affected by code frequency offset is analyzed. Considering complication and perf...
2007, 29(8): 1946-1950.
doi: 10.3724/SP.J.1146.2006.00058
Abstract:
This paper proposes a Path Based-Optimized Shared-Protection algorithm for Multicast sessions (PB-OSPM) against single link failure in WDM mesh networks. Based on the Optimal Path-Pair-based Shared Disjoint Paths (OPP-SDP) algorithm, PB-OSPM introduc...
This paper proposes a Path Based-Optimized Shared-Protection algorithm for Multicast sessions (PB-OSPM) against single link failure in WDM mesh networks. Based on the Optimal Path-Pair-based Shared Disjoint Paths (OPP-SDP) algorithm, PB-OSPM introduc...
2007, 29(8): 1951-1955.
doi: 10.3724/SP.J.1146.2005.01503
Abstract:
Optical Burst Switching (OBS) is a promising paradigm for the next-generation internet infrastructure. Based on analyzing the influence of the special transmission mode in Optical Burst Switching (OBS) networks upon the performance of TCP, this paper...
Optical Burst Switching (OBS) is a promising paradigm for the next-generation internet infrastructure. Based on analyzing the influence of the special transmission mode in Optical Burst Switching (OBS) networks upon the performance of TCP, this paper...
2007, 29(8): 1956-1960.
doi: 10.3724/SP.J.1146.2005.01649
Abstract:
The concept of DTN (Delay-Tolerant Network) is abstracted from many new emerging network instances, which experience frequent long-duration partitions. This particular topology feature makes DTNs routing mechanism very different from typical Internet...
The concept of DTN (Delay-Tolerant Network) is abstracted from many new emerging network instances, which experience frequent long-duration partitions. This particular topology feature makes DTNs routing mechanism very different from typical Internet...
2007, 29(8): 1961-1965.
doi: 10.3724/SP.J.1146.2005.01654
Abstract:
The multi-layers handover in communication based on IMS(IP Multimedia Subsystem)results in the long interruption time of application, which reduces the Quality of Service (QoS) of the system. The process of handover signaling in R6 adopts the handove...
The multi-layers handover in communication based on IMS(IP Multimedia Subsystem)results in the long interruption time of application, which reduces the Quality of Service (QoS) of the system. The process of handover signaling in R6 adopts the handove...
2007, 29(8): 1966-1969.
doi: 10.3724/SP.J.1146.2005.01694
Abstract:
This paper presents a new efficient scheme to implement multicast communication in wormhole switching torus networks. Relied on the concept of partition, divided the network into several blocks, this scheme can achieve high degree of parallelism. Com...
This paper presents a new efficient scheme to implement multicast communication in wormhole switching torus networks. Relied on the concept of partition, divided the network into several blocks, this scheme can achieve high degree of parallelism. Com...
2007, 29(8): 1970-1973.
doi: 10.3724/SP.J.1146.2006.00069
Abstract:
One M/G/1/n queuing network model based on non-preemptive multi-priority messages is proposed for the performance analysis of softswitch entity, which contained multiple processes sharing the same CPU resources. In this model, processing time of mess...
One M/G/1/n queuing network model based on non-preemptive multi-priority messages is proposed for the performance analysis of softswitch entity, which contained multiple processes sharing the same CPU resources. In this model, processing time of mess...
2007, 29(8): 1974-1978.
doi: 10.3724/SP.J.1146.2005.01513
Abstract:
To improve the throughout of the networks and develop the integrated services LAN, a new medium access mode of LANdouble token and double loop protocol is put forward firstly, and then the mathematical modeling research on it is carried through. Afte...
To improve the throughout of the networks and develop the integrated services LAN, a new medium access mode of LANdouble token and double loop protocol is put forward firstly, and then the mathematical modeling research on it is carried through. Afte...
2007, 29(8): 1979-1983.
doi: 10.3724/SP.J.1146.2005.01515
Abstract:
To satisfy the requirement of large-scale streaming application with dispersive users, a novel system architecture of Multi-controller based Cluster Streaming Cache Proxy (MCSCP) is proposed. Two subsystems are introduced in this architecture: a cont...
To satisfy the requirement of large-scale streaming application with dispersive users, a novel system architecture of Multi-controller based Cluster Streaming Cache Proxy (MCSCP) is proposed. Two subsystems are introduced in this architecture: a cont...
2007, 29(8): 1984-1986.
doi: 10.3724/SP.J.1146.2006.00102
Abstract:
Hidden authentication oblivious transfer based on k-out-of-n oblivious transfer and hidden credentials is proposed which solved the problem that standard certificated-based access control to oblivious transfer may exposure some sensitive information ...
Hidden authentication oblivious transfer based on k-out-of-n oblivious transfer and hidden credentials is proposed which solved the problem that standard certificated-based access control to oblivious transfer may exposure some sensitive information ...
2007, 29(8): 1987-1991.
doi: 10.3724/SP.J.1146.2006.00041
Abstract:
A Mobile Robots Path Planning Algorithm based on Immune Evolutionary Negative Selection (MRPPA-IENS) mechanism is proposed in this paper. This algorithm adopts negative selection operators to avoid the bad individuals generation during evolution, whi...
A Mobile Robots Path Planning Algorithm based on Immune Evolutionary Negative Selection (MRPPA-IENS) mechanism is proposed in this paper. This algorithm adopts negative selection operators to avoid the bad individuals generation during evolution, whi...
2007, 29(8): 1992-1996.
doi: 10.3724/SP.J.1146.2006.00042
Abstract:
A novel approach to arbitrary array pattern synthesis based on biorthogonal modes is presented in this paper. The algorithm involving arrays with arbitrary geometry and incorporating mutual coupling effect, can accurately determine element excitation...
A novel approach to arbitrary array pattern synthesis based on biorthogonal modes is presented in this paper. The algorithm involving arrays with arbitrary geometry and incorporating mutual coupling effect, can accurately determine element excitation...
2007, 29(8): 1997-2000.
doi: 10.3724/SP.J.1146.2005.01646
Abstract:
A computation approach of scattering by buried objects is presented by using Finite-Difference Time-Domain (FDTD) method, the Uniaxial Perfectly Matched Layer (UPML), and reciprocity principle. The numerical performance of this approach is in detail ...
A computation approach of scattering by buried objects is presented by using Finite-Difference Time-Domain (FDTD) method, the Uniaxial Perfectly Matched Layer (UPML), and reciprocity principle. The numerical performance of this approach is in detail ...
2007, 29(8): 2001-2005.
doi: 10.3724/SP.J.1146.2005.01521
Abstract:
Charge pump plays an important role in low supply voltage integrated circuits. Three important issues of on-chip charge pump circuits are voltage gain, output voltage ripple and area efficiency. A new charge pump is proposed in this paper which intro...
Charge pump plays an important role in low supply voltage integrated circuits. Three important issues of on-chip charge pump circuits are voltage gain, output voltage ripple and area efficiency. A new charge pump is proposed in this paper which intro...
2007, 29(8): 2006-2008.
doi: 10.3724/SP.J.1146.2006.00122
Abstract:
Based on multi-stage comparison, a new theory incorporating Minimum Comparator Number Algorithm (MCNA) and Power-Conversion Rate Merit Model (PCRMM) is proposed, which releases the power dissipation from limitation of comparators, sub-DACs and residu...
Based on multi-stage comparison, a new theory incorporating Minimum Comparator Number Algorithm (MCNA) and Power-Conversion Rate Merit Model (PCRMM) is proposed, which releases the power dissipation from limitation of comparators, sub-DACs and residu...
2007, 29(8): 2009-2013.
doi: 10.3724/SP.J.1146.2005.01482
Abstract:
In this paper, the design procedure of a harmonic multiplying Gyro-TWT with three stage interaction circuits is presented. The starting oscillation condition of competing modes is studied with linear theory to select the working parameters for keepin...
In this paper, the design procedure of a harmonic multiplying Gyro-TWT with three stage interaction circuits is presented. The starting oscillation condition of competing modes is studied with linear theory to select the working parameters for keepin...
2007, 29(8): 2014-2018.
doi: 10.3724/SP.J.1146.2005.01590
Abstract:
In this paper, the beam-wave interaction of a Ka-band complex cavity gyrotron with gradual transition is studied according to a particle in cell simulation program. The effect of the cavity dimension, electron beam parameter and operating magnetic fi...
In this paper, the beam-wave interaction of a Ka-band complex cavity gyrotron with gradual transition is studied according to a particle in cell simulation program. The effect of the cavity dimension, electron beam parameter and operating magnetic fi...
2007, 29(8): 2019-2022.
doi: 10.3724/SP.J.1146.2005.01462
Abstract:
CVD diamond material, applying in broad band millimeter wave helical Traveling Wave Tube (TWT), is discussed. Two kinds of novel helical slow wave circuit, supported by CVD diamond, are presented. Dispersion, interaction impedance and attenuation of ...
CVD diamond material, applying in broad band millimeter wave helical Traveling Wave Tube (TWT), is discussed. Two kinds of novel helical slow wave circuit, supported by CVD diamond, are presented. Dispersion, interaction impedance and attenuation of ...
2007, 29(8): 2023-2025.
doi: 10.3724/SP.J.1146.2005.01476
Abstract:
Clover-leaf coupled cavity is a kind of slow-wave structure of high interaction impedance.The mathematic analyse and the engineering design are very difficult for its complex structure.In this paper, three- dimensional simulation codes Isfel3d，Mafia，...
Clover-leaf coupled cavity is a kind of slow-wave structure of high interaction impedance.The mathematic analyse and the engineering design are very difficult for its complex structure.In this paper, three- dimensional simulation codes Isfel3d，Mafia，...
2007, 29(8): 2026-2028.
doi: 10.3724/SP.J.1146.2006.00846
Abstract:
A method to construct secret authentication codes by using Cartesian codes is presented in the paper. On the condition of not changing the quantity of encoding rules, the proposed method uses Latin square to reconstruct the optimum Cartesian authenti...
A method to construct secret authentication codes by using Cartesian codes is presented in the paper. On the condition of not changing the quantity of encoding rules, the proposed method uses Latin square to reconstruct the optimum Cartesian authenti...
2007, 29(8): 2029-2032.
doi: 10.3724/SP.J.1146.2006.00112
Abstract:
In this paper, the theoretical model of multistage depressed collector for traveling wave tubes, including the technology of automatic mesh generation, the effects of secondary electrons, space charges, magnetic fields and the method of computation o...
In this paper, the theoretical model of multistage depressed collector for traveling wave tubes, including the technology of automatic mesh generation, the effects of secondary electrons, space charges, magnetic fields and the method of computation o...
