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2006 Vol. 28, No. 6
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2006, 28(6): 961-964.
Abstract:
The Ground Moving Target Indication(GMTI) is investigated based on along track high resolution airborne InSAR with two antennas. The two antenna interferometric processing is used to suppress ground clutter. The concept of moving target imaging is in...
The Ground Moving Target Indication(GMTI) is investigated based on along track high resolution airborne InSAR with two antennas. The two antenna interferometric processing is used to suppress ground clutter. The concept of moving target imaging is in...
2006, 28(6): 965-968.
Abstract:
CurviLinear Synthetic Aperture Radar (CLSAR), whose aperture is formed via single curvilinear trajectory, has the capability of three-dimensional (3-D) imaging. The 3-D images obtained by using non-parametric methods, however, have little practical u...
CurviLinear Synthetic Aperture Radar (CLSAR), whose aperture is formed via single curvilinear trajectory, has the capability of three-dimensional (3-D) imaging. The 3-D images obtained by using non-parametric methods, however, have little practical u...
2006, 28(6): 969-972.
Abstract:
The use of a monostatic radar configuration limits the ability of an Inverse Synthetic Aperture Radar (ISAR) system to image targets moving along the radar Line Of Sight (LOS). By employing bistatic geometries this limitation may be overcome. This pa...
The use of a monostatic radar configuration limits the ability of an Inverse Synthetic Aperture Radar (ISAR) system to image targets moving along the radar Line Of Sight (LOS). By employing bistatic geometries this limitation may be overcome. This pa...
2006, 28(6): 973-976.
Abstract:
UWB SAR works usually in low Signal-to-Clutter Ratio (SCR) conditions in order to detect targets hidden in forest or buried in ground. A Time-Frequency Representation Image Formation (TFRIF) is proposed in this paper, which can get a series of SAR im...
UWB SAR works usually in low Signal-to-Clutter Ratio (SCR) conditions in order to detect targets hidden in forest or buried in ground. A Time-Frequency Representation Image Formation (TFRIF) is proposed in this paper, which can get a series of SAR im...
2006, 28(6): 977-981.
Abstract:
The echo model of airborne bistatic SAR is analyzed in this paper. Based on the echo model and the chirp scaling algorithm of monostatic SAR imaging, the chirp scaling algorithm of bistatic SAR imaging is deduced, and its error is analyzed subsequent...
The echo model of airborne bistatic SAR is analyzed in this paper. Based on the echo model and the chirp scaling algorithm of monostatic SAR imaging, the chirp scaling algorithm of bistatic SAR imaging is deduced, and its error is analyzed subsequent...
2006, 28(6): 982-984.
Abstract:
The ISAR imaging of ship is significant relative to plane. The imaging condition of ship is more complicated than plane due to the complexity of the ships movement, and the conventional ISAR imaging algorithm to the plane can not be satisfactory to t...
The ISAR imaging of ship is significant relative to plane. The imaging condition of ship is more complicated than plane due to the complexity of the ships movement, and the conventional ISAR imaging algorithm to the plane can not be satisfactory to t...
2006, 28(6): 985-988.
Abstract:
Focused the issues on Moving Target Detection (MTD) in spotlight mode Synthetic Aperture Radar (SAR),the echo is divided into groups that are continuous and partly overlapping in time domain. Every group of data can be regarded as coming from a sub-a...
Focused the issues on Moving Target Detection (MTD) in spotlight mode Synthetic Aperture Radar (SAR),the echo is divided into groups that are continuous and partly overlapping in time domain. Every group of data can be regarded as coming from a sub-a...
2006, 28(6): 989-993.
Abstract:
This paper is about Monopulse Secondary Surveillance Redar (MSSR) reply decoding and confidence bits. A novel real-time arithmetic is presented in this paper which uses new rule of garble and overlap to process defruit and to extract reply code. The ...
This paper is about Monopulse Secondary Surveillance Redar (MSSR) reply decoding and confidence bits. A novel real-time arithmetic is presented in this paper which uses new rule of garble and overlap to process defruit and to extract reply code. The ...
2006, 28(6): 994-998.
Abstract:
Change detection is the process of identifying differences in the state of an object or phenomenon by observing it at different times. by removing the correlation among multitemporal images, change information can be detected effectively. Independenc...
Change detection is the process of identifying differences in the state of an object or phenomenon by observing it at different times. by removing the correlation among multitemporal images, change information can be detected effectively. Independenc...
2006, 28(6): 999-1003.
Abstract:
In this paper, a measure of signal variability is defined. Given any set of statistically independent source signals, it is proved here that a linear mixture of those signals has the following property: the signal variability of any signal mixture is...
In this paper, a measure of signal variability is defined. Given any set of statistically independent source signals, it is proved here that a linear mixture of those signals has the following property: the signal variability of any signal mixture is...
2006, 28(6): 1004-1008.
Abstract:
The bearing and range estimation of near-field sources is studied and a new method is presented. The presented algorithm uses the dual-polarization array and second statistics to estimate DOA -range parameter of near-field sources. The method has the...
The bearing and range estimation of near-field sources is studied and a new method is presented. The presented algorithm uses the dual-polarization array and second statistics to estimate DOA -range parameter of near-field sources. The method has the...
2006, 28(6): 1009-1012.
Abstract:
A blind equalization algorithm based on constant modulus and sparse underwater acoustic channel is presented according to the sparse characteristic of the high rate underwater acoustic communications. The algorithm combines the improved constant modu...
A blind equalization algorithm based on constant modulus and sparse underwater acoustic channel is presented according to the sparse characteristic of the high rate underwater acoustic communications. The algorithm combines the improved constant modu...
2006, 28(6): 1013-1015.
Abstract:
During the transmission of digital image, the signal may be blurred by the Point Spread Function (PSF) of the 2-dimensional channel. On the restoration of the image, the influence of PSF should be eliminated without the knowledge of PSF in most real ...
During the transmission of digital image, the signal may be blurred by the Point Spread Function (PSF) of the 2-dimensional channel. On the restoration of the image, the influence of PSF should be eliminated without the knowledge of PSF in most real ...
2006, 28(6): 1016-1020.
Abstract:
This paper presents an MP-based harmonic and individual lines sinusoidal modeling used in parametric audio coding. The input audio signal can be represented by harmonic plus individual lines and the model parameters (amplitudes, frequencies and phase...
This paper presents an MP-based harmonic and individual lines sinusoidal modeling used in parametric audio coding. The input audio signal can be represented by harmonic plus individual lines and the model parameters (amplitudes, frequencies and phase...
2006, 28(6): 1021-1025.
Abstract:
On the basis of cyclostationary feature of speech in short segment, an improved Voice Activity Detection (VAD) algorithm based on higher-order cyclic cumulant is proposed in this paper, which can be applied in complex noise background. In this algori...
On the basis of cyclostationary feature of speech in short segment, an improved Voice Activity Detection (VAD) algorithm based on higher-order cyclic cumulant is proposed in this paper, which can be applied in complex noise background. In this algori...
2006, 28(6): 1026-1030.
Abstract:
The typical target recognition and location is a key technique of the application system for Unmanned Aerial Vehicle (UAV), but there exists a certain difficulty in entirely automatic target recognition and location. A new method to recognize and loc...
The typical target recognition and location is a key technique of the application system for Unmanned Aerial Vehicle (UAV), but there exists a certain difficulty in entirely automatic target recognition and location. A new method to recognize and loc...
2006, 28(6): 1031-1035.
Abstract:
A new group of texture features based on Generalized Local Walsh Transform (GLWT) are presented in this paper. Firstly, Local Walsh Transform (LWT) is defined and generalized in spatial domain to extract local texture information. Then, the twelve 2n...
A new group of texture features based on Generalized Local Walsh Transform (GLWT) are presented in this paper. Firstly, Local Walsh Transform (LWT) is defined and generalized in spatial domain to extract local texture information. Then, the twelve 2n...
2006, 28(6): 1036-1039.
Abstract:
The approach for speaker recognition based on neural networks is able to emulate the function of human brain in some degree, so it is a main implementation technology in the speaker recognition. But it is difficult to determine the number of hidden l...
The approach for speaker recognition based on neural networks is able to emulate the function of human brain in some degree, so it is a main implementation technology in the speaker recognition. But it is difficult to determine the number of hidden l...
2006, 28(6): 1040-1044.
Abstract:
The effects of several types of oppressive broadband interference (BPSK interference, FM interference) on pseudo noise coded fuze system are analyzed. It is found that the correlation output is deteriorated when the interference power is larger than ...
The effects of several types of oppressive broadband interference (BPSK interference, FM interference) on pseudo noise coded fuze system are analyzed. It is found that the correlation output is deteriorated when the interference power is larger than ...
2006, 28(6): 1045-1048.
Abstract:
A time-frequency analysis method for reconnaissance signal recognition of PN and LFM is studied. Wigner time-frequency distribution function for PRBC-LFM reconnaissance signal is deduced. By WVD analysis，features related to carrier frequency, FM slop...
A time-frequency analysis method for reconnaissance signal recognition of PN and LFM is studied. Wigner time-frequency distribution function for PRBC-LFM reconnaissance signal is deduced. By WVD analysis，features related to carrier frequency, FM slop...
2006, 28(6): 1049-1053.
Abstract:
A new robust joint source channel coding method for MPEG-4 video over noisy channel is proposed. In the method, the base layer bit streams are reordered according to their relative importance and then interlaced packetized. Multiple sub-layers of tex...
A new robust joint source channel coding method for MPEG-4 video over noisy channel is proposed. In the method, the base layer bit streams are reordered according to their relative importance and then interlaced packetized. Multiple sub-layers of tex...
2006, 28(6): 1054-1058.
Abstract:
SNRE (Signal-to-Noise Ration Estimator) can be used in a lot of areas in mobile communication, such as the decoder of LDPC code which need it to compute the a priori information of received bits. In this paper, a low complexity blind SNRE, FBSNRE (Fa...
SNRE (Signal-to-Noise Ration Estimator) can be used in a lot of areas in mobile communication, such as the decoder of LDPC code which need it to compute the a priori information of received bits. In this paper, a low complexity blind SNRE, FBSNRE (Fa...
2006, 28(6): 1059-1063.
Abstract:
The high latency introduced by the recursive computation in the MAP-based decoding of turbo codes limits the application of turbo codes in the high data rate transmission。In this paper, a parallel decoding scheme for reducing the decoding delay great...
The high latency introduced by the recursive computation in the MAP-based decoding of turbo codes limits the application of turbo codes in the high data rate transmission。In this paper, a parallel decoding scheme for reducing the decoding delay great...
2006, 28(6): 1064-1067.
Abstract:
By employing MMSE (Minimal Mean Squared Error) criteria, the multi-user transceivers in this paper are optimized by adjusting their signatures and demodulations according to interferences around, which can reduce at most the co-interferences from use...
By employing MMSE (Minimal Mean Squared Error) criteria, the multi-user transceivers in this paper are optimized by adjusting their signatures and demodulations according to interferences around, which can reduce at most the co-interferences from use...
2006, 28(6): 1068-1072.
Abstract:
In a heavy noise,the method based on Wigner Ville (WV) and Hough transformations has the poor performance of detecting the weak signal. To improve it, this paper analyzes the influence of the Fitz Hugh Nagumo(FHN) models parameters on its filtering c...
In a heavy noise,the method based on Wigner Ville (WV) and Hough transformations has the poor performance of detecting the weak signal. To improve it, this paper analyzes the influence of the Fitz Hugh Nagumo(FHN) models parameters on its filtering c...
2006, 28(6): 1073-1076.
Abstract:
Ultra-WideBand (UWB) signal faced badly multi-path fading in indoor environment, RAKE receiver usually is adopted to gather multi-path energy and improve performance. A new diversity scheme is proposed in this paper, which implemented pretreatment in...
Ultra-WideBand (UWB) signal faced badly multi-path fading in indoor environment, RAKE receiver usually is adopted to gather multi-path energy and improve performance. A new diversity scheme is proposed in this paper, which implemented pretreatment in...
2006, 28(6): 1077-1081.
Abstract:
It is a great challenge in UWB communication systems to receive the subnanosecond pulses properly. Most literatures analyzed the performance of UWB systems based on match filter receiver. But the system performance will degrade greatly when there is ...
It is a great challenge in UWB communication systems to receive the subnanosecond pulses properly. Most literatures analyzed the performance of UWB systems based on match filter receiver. But the system performance will degrade greatly when there is ...
2006, 28(6): 1082-1085.
Abstract:
A T/2 fractionally-spaced sparse complete feedback equalizer scheme is proposed to avoid the performance deterioration caused by symbol timing error in the receiver, which is a generalized version of the previously proposed Complete Feedback Equalize...
A T/2 fractionally-spaced sparse complete feedback equalizer scheme is proposed to avoid the performance deterioration caused by symbol timing error in the receiver, which is a generalized version of the previously proposed Complete Feedback Equalize...
2006, 28(6): 1086-1090.
Abstract:
Dynamic network topology, long transport delay and interferences from outer space make the intersatellite communications unstable. In this paper, a link stability model of satellite networks is presented. Based on this model, an intersatellite link d...
Dynamic network topology, long transport delay and interferences from outer space make the intersatellite communications unstable. In this paper, a link stability model of satellite networks is presented. Based on this model, an intersatellite link d...
2006, 28(6): 1091-1094.
Abstract:
Background and advantages of GPS based remote sensing are introduced, characteristics of forward scattered GPS signal such as polarization, variation, code delay due to the wave travel distance difference between direct and scattered signal, and the ...
Background and advantages of GPS based remote sensing are introduced, characteristics of forward scattered GPS signal such as polarization, variation, code delay due to the wave travel distance difference between direct and scattered signal, and the ...
2006, 28(6): 1095-1100.
Abstract:
Transmitter diversity has been studied extensively as a technique for combating channel fading in mobile wireless communications, especially when receiver diversity is expensive or impractical. In this paper, three subspace-tracking channel estimatio...
Transmitter diversity has been studied extensively as a technique for combating channel fading in mobile wireless communications, especially when receiver diversity is expensive or impractical. In this paper, three subspace-tracking channel estimatio...
2006, 28(6): 1101-1105.
Abstract:
The blind space-time channel estimation and multiuser detection algorithm for asynchronous DS-CDMA system in frequency selective Rayleigh fading channel are presented. By investigating the code space of the multipath signals and the data vector space...
The blind space-time channel estimation and multiuser detection algorithm for asynchronous DS-CDMA system in frequency selective Rayleigh fading channel are presented. By investigating the code space of the multipath signals and the data vector space...
2006, 28(6): 1106-1110.
Abstract:
A new chaotic spread spectrum communication system FFH-FMDCSK is presented, which is based on FMDCSK and fast frequency hopping techniques. FFH-FMDCSK is able to improve the performance of FMDCSK on anti-jam, multiple access, and resistance to multip...
A new chaotic spread spectrum communication system FFH-FMDCSK is presented, which is based on FMDCSK and fast frequency hopping techniques. FFH-FMDCSK is able to improve the performance of FMDCSK on anti-jam, multiple access, and resistance to multip...
2006, 28(6): 1111-1114.
Abstract:
In this paper, a new PAM (QAM) constellation is recursively designed by lower order modulation constellation arrangement, and the constellation is still Gray map. The every higher order modulation bit soft output can be calculated by bit soft output ...
In this paper, a new PAM (QAM) constellation is recursively designed by lower order modulation constellation arrangement, and the constellation is still Gray map. The every higher order modulation bit soft output can be calculated by bit soft output ...
2006, 28(6): 1115-1119.
Abstract:
A new video rate control scheme which uses linear source model as content complexity measure of video frames is proposed in this paper to implement bit allocation between frames and rate control over Micro Btocte(MB) level in one frame. Comparing wit...
A new video rate control scheme which uses linear source model as content complexity measure of video frames is proposed in this paper to implement bit allocation between frames and rate control over Micro Btocte(MB) level in one frame. Comparing wit...
2006, 28(6): 1120-1123.
Abstract:
In this paper a new MultiFractal Model (MFM) of Variable Bit Rate (VBR) video traffic is proposed. It makes sure that the approaching performance of the new model (PM-MFM) has better performance than MFM and PM-MFM. Meanwhile, a new frame level VBR t...
In this paper a new MultiFractal Model (MFM) of Variable Bit Rate (VBR) video traffic is proposed. It makes sure that the approaching performance of the new model (PM-MFM) has better performance than MFM and PM-MFM. Meanwhile, a new frame level VBR t...
2006, 28(6): 1124-1128.
Abstract:
There have been two a priori models up till now concerning network traffic: self-similar and multifractal models. The self-similar model is simple enough to characterize network traffic with the single exponent H, however it can not thoroughly descri...
There have been two a priori models up till now concerning network traffic: self-similar and multifractal models. The self-similar model is simple enough to characterize network traffic with the single exponent H, however it can not thoroughly descri...
2006, 28(6): 1129-1134.
Abstract:
Random Early Detection (RED) is a kind of buffer management algorithms which is widely used in the current Internet. To improve the adaptability and fairness of RED is one of the main tasks of the active queue management. In this paper, the buffer oc...
Random Early Detection (RED) is a kind of buffer management algorithms which is widely used in the current Internet. To improve the adaptability and fairness of RED is one of the main tasks of the active queue management. In this paper, the buffer oc...
2006, 28(6): 1135-1140.
Abstract:
Active Networks (AN) are a novel approach to network architecture in which the switches of the network perform customized computations on the messages flowing through them. AN seems to be particularly useful in the context of QoS support. In this pap...
Active Networks (AN) are a novel approach to network architecture in which the switches of the network perform customized computations on the messages flowing through them. AN seems to be particularly useful in the context of QoS support. In this pap...
2006, 28(6): 1141-1144.
Abstract:
In Eurocrypt 2004, Canetti, Halevi and Katz proposed a method for constructing Chosen Ciphertext secure ( ie., CCA secure) public key encryption from any Selective-ID secure ID-Based Encryption (IBE). However, this method needs one time signature and...
In Eurocrypt 2004, Canetti, Halevi and Katz proposed a method for constructing Chosen Ciphertext secure ( ie., CCA secure) public key encryption from any Selective-ID secure ID-Based Encryption (IBE). However, this method needs one time signature and...
2006, 28(6): 1145-1149.
Abstract:
A new kind of group-oriented signature is presented with a new signature model in this paper. The signature has the following properties: it is based on ID cryptography concept; does not have the function of key escrow, that is, no one, other than th...
A new kind of group-oriented signature is presented with a new signature model in this paper. The signature has the following properties: it is based on ID cryptography concept; does not have the function of key escrow, that is, no one, other than th...
2006, 28(6): 1150-1152.
Abstract:
The fractal parameter is very import in studying the chaos signal. Wavelet transform is a useful multi-scale tool for analyzing the fractal. In this paper, the self-similarity property of chaos signal and the properties of the coefficient of wavelet ...
The fractal parameter is very import in studying the chaos signal. Wavelet transform is a useful multi-scale tool for analyzing the fractal. In this paper, the self-similarity property of chaos signal and the properties of the coefficient of wavelet ...
