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2011 Vol. 33, No. 4
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2011, 33(4): 763-768.
doi: 10.3724/SP.J.1146.2010.00839
Abstract:
Fast and efficient segmentation of rigid or stable object in multi-view images is still a unsolved problem. In this paper, the problem is formulated and the relationships between it and traditional min-cut based segmentation problems are also deduced...
Fast and efficient segmentation of rigid or stable object in multi-view images is still a unsolved problem. In this paper, the problem is formulated and the relationships between it and traditional min-cut based segmentation problems are also deduced...
2011, 33(4): 769-774.
doi: 10.3724/SP.J.1146.2010.01003
Abstract:
This paper first discusses the relationship of Principal Component Analysis (PCA) and 2-Dimensional PCA (2DPCA). For 2DPCA eliminating the some covariance information which can be useful for recognition, and PCAs small sample size problem, an algorit...
This paper first discusses the relationship of Principal Component Analysis (PCA) and 2-Dimensional PCA (2DPCA). For 2DPCA eliminating the some covariance information which can be useful for recognition, and PCAs small sample size problem, an algorit...
2011, 33(4): 775-780.
doi: 10.3724/SP.J.1146.2010.00885
Abstract:
Hip angle is a major parameter in gait analysis while gait analysis plays important role in healthcare, animation and other applications. Accurate estimation of hip angle using wearable inertial sensors in ambulatory environment remains a challenge, ...
Hip angle is a major parameter in gait analysis while gait analysis plays important role in healthcare, animation and other applications. Accurate estimation of hip angle using wearable inertial sensors in ambulatory environment remains a challenge, ...
2011, 33(4): 781-786.
doi: 10.3724/SP.J.1146.2010.00763
Abstract:
Based on the estimated polarimetric coherence matrices of the three different scattering mechanisms by Freeman decomposition, the polarimetric interferometric cross-coherence matrices could be simply modeled as a function of the vegetation height, th...
Based on the estimated polarimetric coherence matrices of the three different scattering mechanisms by Freeman decomposition, the polarimetric interferometric cross-coherence matrices could be simply modeled as a function of the vegetation height, th...
2011, 33(4): 787-791.
doi: 10.3724/SP.J.1146.2010.00681
Abstract:
Based on the traditional DBS (Doppler Beam Sharpening) method and the least squares linear fitting algorithm, a new high resolution DBS imaging algorithm is delivered in this paper. The coherent processing number is discussed at first, and the range ...
Based on the traditional DBS (Doppler Beam Sharpening) method and the least squares linear fitting algorithm, a new high resolution DBS imaging algorithm is delivered in this paper. The coherent processing number is discussed at first, and the range ...
2011, 33(4): 792-797.
doi: 10.3724/SP.J.1146.2010.00812
Abstract:
The MOtion COmpensation (MOCO) of Light Of Sight (LOS) error is very important in low-frequency Ultra Wide-Band Synthetic Aperture Radar (UWB SAR). In this paper, the second-order MOCO is studied which compensate the range-variant component of LOS er...
The MOtion COmpensation (MOCO) of Light Of Sight (LOS) error is very important in low-frequency Ultra Wide-Band Synthetic Aperture Radar (UWB SAR). In this paper, the second-order MOCO is studied which compensate the range-variant component of LOS er...
2011, 33(4): 798-804.
doi: 10.3724/SP.J.1146.2010.00668
Abstract:
Burst mode and azimuth beam steering lead to echoes of TOPSAR mode obtain echo characteristics of both ScanSAR and spotlight mode, such as azimuth data folding in the output time domain and Doppler spectrum aliasing. Up-sampling both in the slow time...
Burst mode and azimuth beam steering lead to echoes of TOPSAR mode obtain echo characteristics of both ScanSAR and spotlight mode, such as azimuth data folding in the output time domain and Doppler spectrum aliasing. Up-sampling both in the slow time...
2011, 33(4): 805-809.
doi: 10.3724/SP.J.1146.2010.00704
Abstract:
A computationally efficient Space-Time Adaptive Processing (STAP) method for clutter suppression in airborne MIMO radar is proposed. Firstly, the Doppler filtering is performed to reduce the data dimension in temporal domain. Secondly, the weight vec...
A computationally efficient Space-Time Adaptive Processing (STAP) method for clutter suppression in airborne MIMO radar is proposed. Firstly, the Doppler filtering is performed to reduce the data dimension in temporal domain. Secondly, the weight vec...
2011, 33(4): 810-815.
doi: 10.3724/SP.J.1146.2010.00648
Abstract:
In this paper, the Doppler centroid frequency and the Doppler frequency rate formulas of spaceborne SAR with arbitrary orbit altitude are derived, which provides an effective method for Doppler properties study of MEO SAR and HEO SAR. Based on these ...
In this paper, the Doppler centroid frequency and the Doppler frequency rate formulas of spaceborne SAR with arbitrary orbit altitude are derived, which provides an effective method for Doppler properties study of MEO SAR and HEO SAR. Based on these ...
2011, 33(4): 816-822.
doi: 10.3724/SP.J.1146.2010.00678
Abstract:
In this paper, based on polarization characteristics decomposition of full-polarization information processing, a novel method of detecting low observable targets within sea clutter at low grazing angle is proposed for the first time. Through analyzi...
In this paper, based on polarization characteristics decomposition of full-polarization information processing, a novel method of detecting low observable targets within sea clutter at low grazing angle is proposed for the first time. Through analyzi...
2011, 33(4): 823-830.
doi: 10.3724/SP.J.1146.2010.00486
Abstract:
A new moving target detection algorithm is proposed based on the joint fractal properties discriminant of sea clutter in FRactional Fourier Transform (FRFT) domain. At first, statistical characteristic of sea clutter data in FRFT domain is analyzed a...
A new moving target detection algorithm is proposed based on the joint fractal properties discriminant of sea clutter in FRactional Fourier Transform (FRFT) domain. At first, statistical characteristic of sea clutter data in FRFT domain is analyzed a...
2011, 33(4): 831-837.
doi: 10.3724/SP.J.1146.2010.00750
Abstract:
Airborne forward-looking SAR based on array technology can supply high-resolution images of the area with respect to forward direction of the flight path. However, micro-motion of the array antenna may affect imaging. Extraction method of micro-motio...
Airborne forward-looking SAR based on array technology can supply high-resolution images of the area with respect to forward direction of the flight path. However, micro-motion of the array antenna may affect imaging. Extraction method of micro-motio...
2011, 33(4): 838-843.
doi: 10.3724/SP.J.1146.2010.00730
Abstract:
The paper proposes a scheme for the realization of multi-beam Synthetic Aperture Sonar (SAS) based on the multi-beam bathymetry and aperture synthetic principle, designs a new multiple receiver array structure, deduces correlated math model, and simu...
The paper proposes a scheme for the realization of multi-beam Synthetic Aperture Sonar (SAS) based on the multi-beam bathymetry and aperture synthetic principle, designs a new multiple receiver array structure, deduces correlated math model, and simu...
2011, 33(4): 844-848.
doi: 10.3724/SP.J.1146.2010.00807
Abstract:
The hyperchaotic system, composed of high and slow frequency part, is robust to strong noise. If the conventional synchronization algorithms are used in this system, the convergence rate of synchronization is slow and synchronization performances are...
The hyperchaotic system, composed of high and slow frequency part, is robust to strong noise. If the conventional synchronization algorithms are used in this system, the convergence rate of synchronization is slow and synchronization performances are...
2011, 33(4): 849-853.
doi: 10.3724/SP.J.1146.2010.00731
Abstract:
Honest-sender commitments were introduced to construct non-interactive and non-malleable commitments. In this paper, two honest-sender commitments are given: The first one is honest-sender statistically binding and the second one is perfectly hiding....
Honest-sender commitments were introduced to construct non-interactive and non-malleable commitments. In this paper, two honest-sender commitments are given: The first one is honest-sender statistically binding and the second one is perfectly hiding....
2011, 33(4): 854-857.
doi: 10.3724/SP.J.1146.2010.00837
Abstract:
SP (Substitution Permutation) structure is often used in block ciphers. This paper provides a method which could construct high probability differential trails and linear trails by using characteristic vectors of the diffusion layer. By this method s...
SP (Substitution Permutation) structure is often used in block ciphers. This paper provides a method which could construct high probability differential trails and linear trails by using characteristic vectors of the diffusion layer. By this method s...
2011, 33(4): 858-863.
doi: 10.3724/SP.J.1146.2010.00708
Abstract:
A novel retransmission approach based on Opportunistic Network Coding (ONC) is proposed to improve the transmission efficiency in wireless broadcast scenario. The ONC is applied to the retransmission of lost packets, and an efficient combination stra...
A novel retransmission approach based on Opportunistic Network Coding (ONC) is proposed to improve the transmission efficiency in wireless broadcast scenario. The ONC is applied to the retransmission of lost packets, and an efficient combination stra...
2011, 33(4): 864-868.
doi: 10.3724/SP.J.1146.2010.00134
Abstract:
Gardner bit synchronization method in single carrier is applied to OFDM system, to complete sampling rate synchronization. Gardner loop is composed of timing error estimator, loop filter and interpolation. The loop filter is replaced by linear least-...
Gardner bit synchronization method in single carrier is applied to OFDM system, to complete sampling rate synchronization. Gardner loop is composed of timing error estimator, loop filter and interpolation. The loop filter is replaced by linear least-...
2011, 33(4): 869-873.
doi: 10.3724/SP.J.1146.2010.00830
Abstract:
It is already theoretically presented in previous work that multiple cognitive relay improves the throughput of cognitive networks by increasing diversity in both spatial and temporary domain. According to observation and analysis, huge amounts of re...
It is already theoretically presented in previous work that multiple cognitive relay improves the throughput of cognitive networks by increasing diversity in both spatial and temporary domain. According to observation and analysis, huge amounts of re...
2011, 33(4): 874-879.
doi: 10.3724/SP.J.1146.2010.00692
Abstract:
In this paper , the evolution equations of solitons performance parameters versus distance are deduced by the use of the variational approach under the condition of both the higher-order effects and interaction between solitons for the first time. Ba...
In this paper , the evolution equations of solitons performance parameters versus distance are deduced by the use of the variational approach under the condition of both the higher-order effects and interaction between solitons for the first time. Ba...
2011, 33(4): 880-884.
doi: 10.3724/SP.J.1146.2010.00930
Abstract:
The Channel State Information (CSI) is not taken into consideration in Multi-Hop Alamouti Amplify and Forward (AAF-MH) cooperation protocol. For this issue, Multi-Hop Alamouti Amplify and Forward with Phase Rotation (AAF-MH-PR) cooperative scheme is ...
The Channel State Information (CSI) is not taken into consideration in Multi-Hop Alamouti Amplify and Forward (AAF-MH) cooperation protocol. For this issue, Multi-Hop Alamouti Amplify and Forward with Phase Rotation (AAF-MH-PR) cooperative scheme is ...
2011, 33(4): 885-890.
doi: 10.3724/SP.J.1146.2010.00836
Abstract:
It has been proved that many popular link quality prediction algorithms perform much more poorly when they are applied to real environments. To address this problem, a low-complexity, on-line link quality prediction mechanism is constructed which can...
It has been proved that many popular link quality prediction algorithms perform much more poorly when they are applied to real environments. To address this problem, a low-complexity, on-line link quality prediction mechanism is constructed which can...
2011, 33(4): 891-895.
doi: 10.3724/SP.J.1146.2010.00780
Abstract:
The Received Signal Strength Indicator (RSSI) based location is easy to be affected by multipath interference in wireless sensor networks. The traditional RSSI-based location methods usually increase the number of samples to resist multipath interfer...
The Received Signal Strength Indicator (RSSI) based location is easy to be affected by multipath interference in wireless sensor networks. The traditional RSSI-based location methods usually increase the number of samples to resist multipath interfer...
2011, 33(4): 896-901.
doi: 10.3724/SP.J.1146.2010.00813
Abstract:
The time-varying Received Signal Strength (RSS) drastically degrades the indoor positioning accuracy in Wireless Local Area Network (WLAN). A new positioning algorithm based on Kernel Direct Discriminant Analysis (KDDA) and Support Vector Regression ...
The time-varying Received Signal Strength (RSS) drastically degrades the indoor positioning accuracy in Wireless Local Area Network (WLAN). A new positioning algorithm based on Kernel Direct Discriminant Analysis (KDDA) and Support Vector Regression ...
2011, 33(4): 902-907.
doi: 10.3724/SP.J.1146.2010.00751
Abstract:
To address the state explosion problem in the procedure of model checking, this paper proposes a SPIN- based modularized model checking method. The proposed method divides the original abstraction model into some modules, and verifies all the divided...
To address the state explosion problem in the procedure of model checking, this paper proposes a SPIN- based modularized model checking method. The proposed method divides the original abstraction model into some modules, and verifies all the divided...
2011, 33(4): 908-914.
doi: 10.3724/SP.J.1146.2010.00735
Abstract:
Based on the previous research, a new algorithm with the K-shortest path is proposed. This algorithm searches the K-shortest path for increasing K, and stops the search if one with enough bandwidth capacity is found. The search process enhances the p...
Based on the previous research, a new algorithm with the K-shortest path is proposed. This algorithm searches the K-shortest path for increasing K, and stops the search if one with enough bandwidth capacity is found. The search process enhances the p...
2011, 33(4): 915-921.
doi: 10.3724/SP.J.1146.2010.00729
Abstract:
Regional MANET which contains near space vehicles as a part is a new kind of Ad hoc network. This paper proposed a deployment scheme for such network based on Particle Swarm Optimization (PSO) algorithm. For nodes which are near space vehicles, their...
Regional MANET which contains near space vehicles as a part is a new kind of Ad hoc network. This paper proposed a deployment scheme for such network based on Particle Swarm Optimization (PSO) algorithm. For nodes which are near space vehicles, their...
2011, 33(4): 922-926.
doi: 10.3724/SP.J.1146.2010.00792
Abstract:
The vector and scalar potentials Greens functions of the Horizontal Electric Dipole (HED) radiation in sea water are derived. The Discrete Complex Image Method (DCIM) which has been used broadly in high frequency domain is introduced into the Extreme...
The vector and scalar potentials Greens functions of the Horizontal Electric Dipole (HED) radiation in sea water are derived. The Discrete Complex Image Method (DCIM) which has been used broadly in high frequency domain is introduced into the Extreme...
2011, 33(4): 927-931.
doi: 10.3724/SP.J.1146.2010.00685
Abstract:
Although the algorithms based on the Method of Characteristics (MoC) can ensure the transmission-line causality, there is no guarantee of passivity of the resulting macromodels. This paper proposes a new perturbation method for the passivity enforcem...
Although the algorithms based on the Method of Characteristics (MoC) can ensure the transmission-line causality, there is no guarantee of passivity of the resulting macromodels. This paper proposes a new perturbation method for the passivity enforcem...
2011, 33(4): 932-937.
doi: 10.3724/SP.J.1146.2010.00776
Abstract:
Mixed-Polarity conversion is one of important phases in logic synthesis of Reed-Muller (RM) circuits, which implements the conversions from Boolean logic Minterm expressions to RM logic Mixed-Polarity Reed-Muller (MPRM) expressions. In this paper, ba...
Mixed-Polarity conversion is one of important phases in logic synthesis of Reed-Muller (RM) circuits, which implements the conversions from Boolean logic Minterm expressions to RM logic Mixed-Polarity Reed-Muller (MPRM) expressions. In this paper, ba...
2011, 33(4): 938-944.
doi: 10.3724/SP.J.1146.2010.00714
Abstract:
This paper proposes a novel delay-independent communication interface used in multiprocessor System- on-Chip (SoC) and Network-on-Chip (NoC). Data can be transferred fast from asynchronous to synchronous through the interface gracefully, which is imp...
This paper proposes a novel delay-independent communication interface used in multiprocessor System- on-Chip (SoC) and Network-on-Chip (NoC). Data can be transferred fast from asynchronous to synchronous through the interface gracefully, which is imp...
2011, 33(4): 945-950.
doi: 10.3724/SP.J.1146.2010.00895
Abstract:
The power consumption, wiring overhead and crosstalk in deep sub-micron on-chip buses are the main facts restricting the bus throughput. An adaptive spatio-temporal bus coding scheme is proposed to reduce crosstalk induced delay and power consumption...
The power consumption, wiring overhead and crosstalk in deep sub-micron on-chip buses are the main facts restricting the bus throughput. An adaptive spatio-temporal bus coding scheme is proposed to reduce crosstalk induced delay and power consumption...
2011, 33(4): 951-955.
doi: 10.3724/SP.J.1146.2010.00789
Abstract:
In this paper, a Field Effect Transistor (FET) operating in close to cut off frequency is used to replace the attenuator and the phase-shifter in most TWT predistortion circuit, which can realize good control for the amount of gain expansion with lit...
In this paper, a Field Effect Transistor (FET) operating in close to cut off frequency is used to replace the attenuator and the phase-shifter in most TWT predistortion circuit, which can realize good control for the amount of gain expansion with lit...
2011, 33(4): 956-961.
doi: 10.3724/SP.J.1146.2010.00795
Abstract:
The theory of periodic permanent magnetic focusing system is studied. 2D second-order finite element method is used to simulate magnetic displacement of axisymmetric permanent magnetic models in cylindrical coordinates. First the convergence is compa...
The theory of periodic permanent magnetic focusing system is studied. 2D second-order finite element method is used to simulate magnetic displacement of axisymmetric permanent magnetic models in cylindrical coordinates. First the convergence is compa...
2011, 33(4): 962-966.
doi: 10.3724/SP.J.1146.2010.00787
Abstract:
Based on the image differences, Intrinsicface is proposed, which divides the face image into three parts, common facial differences, intrapersonal differences and individual differences, and shows desirable performance. But it does not consider the m...
Based on the image differences, Intrinsicface is proposed, which divides the face image into three parts, common facial differences, intrapersonal differences and individual differences, and shows desirable performance. But it does not consider the m...
2011, 33(4): 967-971.
doi: 10.3724/SP.J.1146.2010.00684
Abstract:
Based on the standard compressed sensing, the model-based Compressed Sensing (CS) uses the tree structure priors, and solves the optimal reconstruction problem with two existing tree structure approximation which are greedy tree approximation and opt...
Based on the standard compressed sensing, the model-based Compressed Sensing (CS) uses the tree structure priors, and solves the optimal reconstruction problem with two existing tree structure approximation which are greedy tree approximation and opt...
2011, 33(4): 972-976.
doi: 10.3724/SP.J.1146.2010.00783
Abstract:
Weighted Subspace Fitting (WSF) algorithm is a well-known excellent algorithm for DOA estimation with low SNR and few snapshots. However, this algorithm is totally impractical for its prohibitive computational burden incurred by multi-dimensional non...
Weighted Subspace Fitting (WSF) algorithm is a well-known excellent algorithm for DOA estimation with low SNR and few snapshots. However, this algorithm is totally impractical for its prohibitive computational burden incurred by multi-dimensional non...
2011, 33(4): 977-981.
doi: 10.3724/SP.J.1146.2010.00599
Abstract:
For multi-sensor distributed and quantitative estimation fusion problem of underwater target detection, a model of distributed and quantitative estimation fusion is established. The channel noise and its statistical property which is not fully known ...
For multi-sensor distributed and quantitative estimation fusion problem of underwater target detection, a model of distributed and quantitative estimation fusion is established. The channel noise and its statistical property which is not fully known ...
2011, 33(4): 982-986.
doi: 10.3724/SP.J.1146.2010.00691
Abstract:
With the development of wideband radar technology, classic narrowband Cramer-Rao (CR) bound can not be used as the criteria for the parameters estimation. Based on the application of Wideband Stepped Frequency Signal (WSFS), the wideband CR bound for...
With the development of wideband radar technology, classic narrowband Cramer-Rao (CR) bound can not be used as the criteria for the parameters estimation. Based on the application of Wideband Stepped Frequency Signal (WSFS), the wideband CR bound for...
2011, 33(4): 987-991.
doi: 10.3724/SP.J.1146.2010.00794
Abstract:
As the application of SATCOM On-The-Move (SOTM) is restricted by the height of antenna, the planar antenna with multiple subarrays is adopted to reduce the height of antenna. However, the excursion of beam pointing versus frequency is deteriorated be...
As the application of SATCOM On-The-Move (SOTM) is restricted by the height of antenna, the planar antenna with multiple subarrays is adopted to reduce the height of antenna. However, the excursion of beam pointing versus frequency is deteriorated be...
2011, 33(4): 992-996.
doi: 10.3724/SP.J.1146.2010.00756
Abstract:
The Asymptotic Waveform Evaluation (AWE) technique combined with the Method of Moments (MoM) is often applied to accelerate the calculation of the wide-band Radar Cross Section (RCS) of the target. However, when the object is electrically large, the ...
The Asymptotic Waveform Evaluation (AWE) technique combined with the Method of Moments (MoM) is often applied to accelerate the calculation of the wide-band Radar Cross Section (RCS) of the target. However, when the object is electrically large, the ...
2011, 33(4): 997-1001.
doi: 10.3724/SP.J.1146.2010.00471
Abstract:
When the feedback structure based on COSTAS loop is used in carrier synchronization of OQPSK signal with large frequency offset, the locking time is so long that feedback structure poorly fits for burst signal. To resolve this problem, this paper des...
When the feedback structure based on COSTAS loop is used in carrier synchronization of OQPSK signal with large frequency offset, the locking time is so long that feedback structure poorly fits for burst signal. To resolve this problem, this paper des...
2011, 33(4): 1002-1006.
doi: 10.3724/SP.J.1146.2010.00721
Abstract:
The communication simulation model of HF multitone parallel transmission is established，and the anti-jamming performance of narrowband and broadband is analyzed based on the model. A new method of subcarriers skipping anti-jamming for HF Tactical Dat...
The communication simulation model of HF multitone parallel transmission is established，and the anti-jamming performance of narrowband and broadband is analyzed based on the model. A new method of subcarriers skipping anti-jamming for HF Tactical Dat...
2011, 33(4): 1007-1011.
doi: 10.3724/SP.J.1146.2010.00758
Abstract:
In this paper, a novel fusion based coding scheme of multi-view image is proposed. At the encoder, different sources of images are decomposed into IMFs (Intrinsic Mode Factions) and residue using CEMD (Complex Empirical Mode Decomposition). The IMFs ...
In this paper, a novel fusion based coding scheme of multi-view image is proposed. At the encoder, different sources of images are decomposed into IMFs (Intrinsic Mode Factions) and residue using CEMD (Complex Empirical Mode Decomposition). The IMFs ...
2011, 33(4): 1012-1016.
doi: 10.3724/SP.J.1146.2010.00712
Abstract:
Having an effective consistency maintenance mechanism is one of keys to guarantee P2P systems running in good condition. In unstructured P2P systems, message transmission is mainly by neighbors so that many redundant messages are produced. Moreover, ...
Having an effective consistency maintenance mechanism is one of keys to guarantee P2P systems running in good condition. In unstructured P2P systems, message transmission is mainly by neighbors so that many redundant messages are produced. Moreover, ...
