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1995 Vol. 17, No. 3
Display Method:
1995, 17(3): 225-231.
Abstract:
The Multilayer feedforward network is used for image segmentation. The procedure of achieving learning patterns and the method of improving the leaning rate are discussed. The experiment shows that using the multilayer feedforward network for image s...
The Multilayer feedforward network is used for image segmentation. The procedure of achieving learning patterns and the method of improving the leaning rate are discussed. The experiment shows that using the multilayer feedforward network for image s...
1995, 17(3): 232-237.
Abstract:
This paper gives a simple analysis of the method of using the Hop-field s optimization neural network to solve the DOA estimation problem. Although the method can avoid the eigendecomposition of data autocorrelation matrix and the orthogonality searc...
This paper gives a simple analysis of the method of using the Hop-field s optimization neural network to solve the DOA estimation problem. Although the method can avoid the eigendecomposition of data autocorrelation matrix and the orthogonality searc...
1995, 17(3): 238-242.
Abstract:
Theoretical bounds are given for the number and period of nonrepea, ting Frequency Hopping (FH) sequences in asynchronous frequency hopping multiple access, with a guaranteed maximum number of pairwise hits. Practical constructions for families of no...
Theoretical bounds are given for the number and period of nonrepea, ting Frequency Hopping (FH) sequences in asynchronous frequency hopping multiple access, with a guaranteed maximum number of pairwise hits. Practical constructions for families of no...
THE FOURTH-ORDER CUMULANTS BASED SPECTRAL ESTIMATION METHOD AND ITS APPLICATION TO DIRECTION-FINDING
1995, 17(3): 243-249.
Abstract:
Traditional approaches of spatial spectral estimation are usually based on the second-order statistics. The higher-order cumulants and the poly-spectrum have more information and are capable to reduce the Gaussian noises. In this paper, a kind of spe...
Traditional approaches of spatial spectral estimation are usually based on the second-order statistics. The higher-order cumulants and the poly-spectrum have more information and are capable to reduce the Gaussian noises. In this paper, a kind of spe...
1995, 17(3): 250-255.
Abstract:
A systematic study of matrix prediction method for signal-pole estimation and equations of forward, backward and forward-backward matrix prediction are presented. The relationship between matrix prediction method and linear prediction method is propo...
A systematic study of matrix prediction method for signal-pole estimation and equations of forward, backward and forward-backward matrix prediction are presented. The relationship between matrix prediction method and linear prediction method is propo...
1995, 17(3): 256-260.
Abstract:
This paper improves the model of Chirp Scaling (CS) SAR imaging algorithm. Based on the theoretical analysis, the exact formulation of point target in two-dimensional frequency domain and the phase error are obtained. According to the characteristics...
This paper improves the model of Chirp Scaling (CS) SAR imaging algorithm. Based on the theoretical analysis, the exact formulation of point target in two-dimensional frequency domain and the phase error are obtained. According to the characteristics...
1995, 17(3): 261-267.
Abstract:
A new method for image-velocity computation is described. If the image area is known, then by using a set of intersecting delay lines, the two perpendicular components of image velocity can be analysed and computed, but if the image area is not knows...
A new method for image-velocity computation is described. If the image area is known, then by using a set of intersecting delay lines, the two perpendicular components of image velocity can be analysed and computed, but if the image area is not knows...
1995, 17(3): 268-275.
Abstract:
This paper discusses the effect of impulse response aberration between channels on the sidelobe level of a DBF array, and then derives the relationship between the frequency response mismatch and the impulse response aberration of a channel, by which...
This paper discusses the effect of impulse response aberration between channels on the sidelobe level of a DBF array, and then derives the relationship between the frequency response mismatch and the impulse response aberration of a channel, by which...
1995, 17(3): 276-282.
Abstract:
A new kind of bianisotropic waveguide structure is introduced. In such complex waveguide, the transverse field components can also be expressed in terms of their longitudinal electric and magnetic fields, and a set of coupled mode equations is derive...
A new kind of bianisotropic waveguide structure is introduced. In such complex waveguide, the transverse field components can also be expressed in terms of their longitudinal electric and magnetic fields, and a set of coupled mode equations is derive...
1995, 17(3): 283-290.
Abstract:
A new method, the optimized simulated image method in combination with conformal mapping, is introduced to calculate the characteristic impedance of arbitrarily shaped coaxial transmission lines. It is of small calculating amount and high accuracy, a...
A new method, the optimized simulated image method in combination with conformal mapping, is introduced to calculate the characteristic impedance of arbitrarily shaped coaxial transmission lines. It is of small calculating amount and high accuracy, a...
1995, 17(3): 291-297.
Abstract:
A wide frequency band two-way rotary joint (in the same frequency band) is described. Its VSWR is less than 1.3 over the frequency range from 0.7 GHz to 1.4GHz, its insert loss is less than 0.50dB, its isolation is better than 40dB. The rotary joint ...
A wide frequency band two-way rotary joint (in the same frequency band) is described. Its VSWR is less than 1.3 over the frequency range from 0.7 GHz to 1.4GHz, its insert loss is less than 0.50dB, its isolation is better than 40dB. The rotary joint ...
1995, 17(3): 298-303.
Abstract:
An experiment for preparation of SOI films by using scanning electron beam to modify polycrystalline silicon on SiO2 is presented. This method takes on the lateral epitaxial growth of liquid phase crystallon to form monocrystal Si films. The effects ...
An experiment for preparation of SOI films by using scanning electron beam to modify polycrystalline silicon on SiO2 is presented. This method takes on the lateral epitaxial growth of liquid phase crystallon to form monocrystal Si films. The effects ...
1995, 17(3): 304-310.
Abstract:
A new algorithm of calculating depth information by image sequences acquired from the parallel multi-viewpoints is discussed. By means of orthogonal transformation of image (in this paper, the authors use fast Fourier transformation), the matching pr...
A new algorithm of calculating depth information by image sequences acquired from the parallel multi-viewpoints is discussed. By means of orthogonal transformation of image (in this paper, the authors use fast Fourier transformation), the matching pr...
1995, 17(3): 311-314.
Abstract:
An 8mm wave PLL system is designed and manufactured by use of multi-loops. It is measured that the phase noise of mm-wave PLL source is-78dBc/ Hz (Fourier frequency is 1kHz offset carrier 37.4 GHz), spurious is lower than-60 dBc, output power is high...
An 8mm wave PLL system is designed and manufactured by use of multi-loops. It is measured that the phase noise of mm-wave PLL source is-78dBc/ Hz (Fourier frequency is 1kHz offset carrier 37.4 GHz), spurious is lower than-60 dBc, output power is high...
1995, 17(3): 315-320.
Abstract:
An implicit finite-difference (IFD) scheme of box method is introduced for solving the parabolic equation representing electromagnetic wave propagation in the troposphere. The consistency, stability and convergence of the box method is demonstrated. ...
An implicit finite-difference (IFD) scheme of box method is introduced for solving the parabolic equation representing electromagnetic wave propagation in the troposphere. The consistency, stability and convergence of the box method is demonstrated. ...
1995, 17(3): 321-323.
Abstract:
By using electromagnentism relativity transformation method, the propagation properties of EM mode of nonlinear slab optical waveguide in moving were studied. The results in moving reference system and in laboratory reference system were compared.
By using electromagnentism relativity transformation method, the propagation properties of EM mode of nonlinear slab optical waveguide in moving were studied. The results in moving reference system and in laboratory reference system were compared.
1995, 17(3): 324-328.
Abstract:
The linear structures of Boolean functions are discussed using characteristic set of Boolean functions, and a way to find linear structures of Boolean functions is given. Then, the linear structures of Boolean functions are generalized, and r-type li...
The linear structures of Boolean functions are discussed using characteristic set of Boolean functions, and a way to find linear structures of Boolean functions is given. Then, the linear structures of Boolean functions are generalized, and r-type li...
1995, 17(3): 329-333.
Abstract:
This paper analyzes the cause of the crosswind effect inherent in the SG scheme and its influence on the SG scheme. It provides the basis for the application of the SG scheme.
This paper analyzes the cause of the crosswind effect inherent in the SG scheme and its influence on the SG scheme. It provides the basis for the application of the SG scheme.
1995, 17(3): 334-336.
Abstract:
The deep levels in electron irradiated CZ silicon single crystal grown in pure nitrogen protective atmosphere has been studied. It is pointed out that there is no measurable deep level related to nitrogen.
The deep levels in electron irradiated CZ silicon single crystal grown in pure nitrogen protective atmosphere has been studied. It is pointed out that there is no measurable deep level related to nitrogen.
