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2003 Vol. 25, No. 8
Display Method:
2003, 25(8): 1009-1013.
Abstract:
A pixel-level multisensor image fusion algorithm is proposed in this paper, and applied to fusion two SAR images of different frequency. A gray fusion image is firstly obtained using image fusion technique based on Kalman filter. Then, the gray fusio...
A pixel-level multisensor image fusion algorithm is proposed in this paper, and applied to fusion two SAR images of different frequency. A gray fusion image is firstly obtained using image fusion technique based on Kalman filter. Then, the gray fusio...
2003, 25(8): 1014-1020.
Abstract:
This paper presents a theoretical analysis in the sense of the Neyman-Pearson (N-P) test about the relationship between fusion rule and local decision rules in the parallel distributed detection fusion system with multiple sensors. It combines wavele...
This paper presents a theoretical analysis in the sense of the Neyman-Pearson (N-P) test about the relationship between fusion rule and local decision rules in the parallel distributed detection fusion system with multiple sensors. It combines wavele...
2003, 25(8): 1021-1028.
Abstract:
In this paper, based on analyzing the relationship between the symmetry of a filters transfer function and its impulse response sequence, a class of filter with sparse impulse response coefficients is presented. Using this class of filter as the prot...
In this paper, based on analyzing the relationship between the symmetry of a filters transfer function and its impulse response sequence, a class of filter with sparse impulse response coefficients is presented. Using this class of filter as the prot...
2003, 25(8): 1029-1034.
Abstract:
Multi-channel GPS satellite signal simulator provides realistic test signals for GPS receivers and navigation systems. In this paper, signals arriving the antenna of GPS receiver are analyzed from the point of view of simulator design. Focus is put o...
Multi-channel GPS satellite signal simulator provides realistic test signals for GPS receivers and navigation systems. In this paper, signals arriving the antenna of GPS receiver are analyzed from the point of view of simulator design. Focus is put o...
2003, 25(8): 1035-1041.
Abstract:
Operating in the heavy congested SW band, HF radars use a quasi-random step frequency signal to avoid the interference bands. However, the sidelobe of this signal after matching processing is very high, thus would greatly debase the radars performanc...
Operating in the heavy congested SW band, HF radars use a quasi-random step frequency signal to avoid the interference bands. However, the sidelobe of this signal after matching processing is very high, thus would greatly debase the radars performanc...
2003, 25(8): 1042-1050.
Abstract:
Based on the side-looking SAR mode of distributed satellites SAR system, this paper gives the mathematical model of radar echo signal of distributed satellite SAR, and proposes a detecting and imaging algorithm of the moving targets with low velocity...
Based on the side-looking SAR mode of distributed satellites SAR system, this paper gives the mathematical model of radar echo signal of distributed satellite SAR, and proposes a detecting and imaging algorithm of the moving targets with low velocity...
2003, 25(8): 1051-1058.
Abstract:
The characteristics of ship wakes in SAR image is analysed, the model of speckle noise and its local statistic characteristics are also analyzed. A ship wake detection algorithm is proposed in this paper, which based on wavelet transform to suppress ...
The characteristics of ship wakes in SAR image is analysed, the model of speckle noise and its local statistic characteristics are also analyzed. A ship wake detection algorithm is proposed in this paper, which based on wavelet transform to suppress ...
2003, 25(8): 1059-1065.
Abstract:
In this paper, an adaptive segmentating, hybrid coding scheme of radar return is presented. Firstly, radar return is divided into two classes by adaptive Gaussian mixture model: foreground and background, the former is composed of moving targets, whi...
In this paper, an adaptive segmentating, hybrid coding scheme of radar return is presented. Firstly, radar return is divided into two classes by adaptive Gaussian mixture model: foreground and background, the former is composed of moving targets, whi...
2003, 25(8): 1066-1072.
Abstract:
In SAR azimuth signal processing, it is very common to subsample the raw data with a filter, which may reduce the Signal Noise Ratio(SNR) of the raw image. Since autofocus is to estimate the Doppler parameters from the raw data, with the reduced SNR,...
In SAR azimuth signal processing, it is very common to subsample the raw data with a filter, which may reduce the Signal Noise Ratio(SNR) of the raw image. Since autofocus is to estimate the Doppler parameters from the raw data, with the reduced SNR,...
2003, 25(8): 1073-1080.
Abstract:
The technology of clustering high resolution imagery is difficult, due to the fact that the minor components, such as roads, make the appearance of the same category region non-uniform. This paper proposes a new approach to cluster high resolution re...
The technology of clustering high resolution imagery is difficult, due to the fact that the minor components, such as roads, make the appearance of the same category region non-uniform. This paper proposes a new approach to cluster high resolution re...
2003, 25(8): 1081-1087.
Abstract:
One of the key issues in integrated dynamic IP and wavelength routing algorithm is how to determine whether it is better to route an arriving Label Switch Path (LSP) estab-lishment request over the existing topology or to open new wavelength paths, A...
One of the key issues in integrated dynamic IP and wavelength routing algorithm is how to determine whether it is better to route an arriving Label Switch Path (LSP) estab-lishment request over the existing topology or to open new wavelength paths, A...
2003, 25(8): 1088-1094.
Abstract:
Handoffs in a mobile cellular communications environment will become an increas-ingly important issue as cell sizes shrink to accommodate an increasingly large demand for service. CDMA cellular systems use soft handoff. To cope with the channel short...
Handoffs in a mobile cellular communications environment will become an increas-ingly important issue as cell sizes shrink to accommodate an increasingly large demand for service. CDMA cellular systems use soft handoff. To cope with the channel short...
2003, 25(8): 1095-1100.
Abstract:
This paper presents a structure based on noncoherent-SPRT algorithm for the sequence acquisition under large frequency offset and low signal to noise ratio in DS/SS systems. The emphasis is put on the effect of frequency offset and partial correlatio...
This paper presents a structure based on noncoherent-SPRT algorithm for the sequence acquisition under large frequency offset and low signal to noise ratio in DS/SS systems. The emphasis is put on the effect of frequency offset and partial correlatio...
2003, 25(8): 1101-1107.
Abstract:
In this paper, a novel adaptive power and rate control scheme is studied, the BER. (Bit Error Rate) formula for the wideband CDMA system with this scheme is derived, and the numerical results of performance analysis in flat fading and frequency-selec...
In this paper, a novel adaptive power and rate control scheme is studied, the BER. (Bit Error Rate) formula for the wideband CDMA system with this scheme is derived, and the numerical results of performance analysis in flat fading and frequency-selec...
2003, 25(8): 1108-1113.
Abstract:
This paper points out the contradiction between the way of computing the differential characteristic probability and the principle of differential cryptanalysis, gives a deep reaserch on it and proposes a equivalent sufficient condition. The goal of ...
This paper points out the contradiction between the way of computing the differential characteristic probability and the principle of differential cryptanalysis, gives a deep reaserch on it and proposes a equivalent sufficient condition. The goal of ...
2003, 25(8): 1114-1119.
Abstract:
The Domain Decomposition FDTD (DD-FDTD) method is presented for solving complex 3-D problems and improving the accuracy of solutions. According to the features of the problem, the original domain is decomposed into several sub-domains. In each sub-do...
The Domain Decomposition FDTD (DD-FDTD) method is presented for solving complex 3-D problems and improving the accuracy of solutions. According to the features of the problem, the original domain is decomposed into several sub-domains. In each sub-do...
2003, 25(8): 1120-1125.
Abstract:
The dipole antenna array with trough reflector is widely applied to base stations for mobile communications. In order to simulate the antenna units and the trough reflector accurately and take the limitation of computation resources into account, thi...
The dipole antenna array with trough reflector is widely applied to base stations for mobile communications. In order to simulate the antenna units and the trough reflector accurately and take the limitation of computation resources into account, thi...
2003, 25(8): 1126-1129.
Abstract:
In this paper, a kind of rectanglar double gap output cavity model is studied. Si-ulation of the model with Mafia and ISFEL3D, three dimension electromagnetic field calculation software, is given. The frequency, characteristic impedance and field dis...
In this paper, a kind of rectanglar double gap output cavity model is studied. Si-ulation of the model with Mafia and ISFEL3D, three dimension electromagnetic field calculation software, is given. The frequency, characteristic impedance and field dis...
2003, 25(8): 1130-1134.
Abstract:
To solve the problems of the complexity of SVM-MUD model and the number of support vectors, a new algorithm for nonlinear multiuser detection is proposed in the paper. The algorithm introduced the forgetting factor to get the support vectors at the f...
To solve the problems of the complexity of SVM-MUD model and the number of support vectors, a new algorithm for nonlinear multiuser detection is proposed in the paper. The algorithm introduced the forgetting factor to get the support vectors at the f...
2003, 25(8): 1135-1138.
Abstract:
This paper presents how to implement the corner turn memory which is the important phase in synthetic aperture radar real-time processor by using SDRAM as the memory. SDRAM controller is described in detail including auto pre-charge function, refresh...
This paper presents how to implement the corner turn memory which is the important phase in synthetic aperture radar real-time processor by using SDRAM as the memory. SDRAM controller is described in detail including auto pre-charge function, refresh...
2003, 25(8): 1139-1142.
Abstract:
In communication systems, the application of microstrip active antenna is useful for the simplification and downsizing of the system. But because the antenna is integrated with active devices, the harmonics produced by the active devices can result i...
In communication systems, the application of microstrip active antenna is useful for the simplification and downsizing of the system. But because the antenna is integrated with active devices, the harmonics produced by the active devices can result i...
2003, 25(8): 1143-1147.
Abstract:
Round robin scheduling algorithm is a classic scheduling algorithm with many ap-plications. An FPGA implementation by using barrel shifter and pipelined priority encoder is presented in this paper with considering the FPGA structure characteristic an...
Round robin scheduling algorithm is a classic scheduling algorithm with many ap-plications. An FPGA implementation by using barrel shifter and pipelined priority encoder is presented in this paper with considering the FPGA structure characteristic an...
2003, 25(8): 1148-1152.
Abstract:
Electromagnetic leakage of video display unit becomes the focus of wide interest recently. An image-reconstruction system is presented here using electromagnetic leakage from video display unit. In this system a loop antenna is employed to receive th...
Electromagnetic leakage of video display unit becomes the focus of wide interest recently. An image-reconstruction system is presented here using electromagnetic leakage from video display unit. In this system a loop antenna is employed to receive th...
