Email alert
1996 Vol. 18, No. 6
Display Method:
1996, 18(6): 561-566.
Abstract:
For a tracking system consisting of heterogeneous sensors such as radar and IRST, the combinatorial assignment is applied to solve the multitarget data association which is formulated as a partition of the multiple dimension data set including the measurements and predicted tracks from targets.
For a tracking system consisting of heterogeneous sensors such as radar and IRST, the combinatorial assignment is applied to solve the multitarget data association which is formulated as a partition of the multiple dimension data set including the measurements and predicted tracks from targets.
1996, 18(6): 567-573.
Abstract:
A new type matrix-mixed DOA matrix is formed with the information of two identical translation subarrays. When there exsit displacements along X and Y axes, the nonzero eigenvalues and eigenvectors are mixed direction elements and vectors. Generally, the method can solve the sources come from the same DOA with auto-pairing and has lesser loss of the array aperture.
A new type matrix-mixed DOA matrix is formed with the information of two identical translation subarrays. When there exsit displacements along X and Y axes, the nonzero eigenvalues and eigenvectors are mixed direction elements and vectors. Generally, the method can solve the sources come from the same DOA with auto-pairing and has lesser loss of the array aperture.
1996, 18(6): 574-581.
Abstract:
Second-order almost cyclostationary complex processes are complex random signals with almost periodically time-varying statistics. Smoothed periodograms are proposed for discrete-time complex 2nd-order cyclostationary processes as cyclic spectral estimation and are shown to be consistent. Asymptotic covariance expressions are derived along with their computable forms.
Second-order almost cyclostationary complex processes are complex random signals with almost periodically time-varying statistics. Smoothed periodograms are proposed for discrete-time complex 2nd-order cyclostationary processes as cyclic spectral estimation and are shown to be consistent. Asymptotic covariance expressions are derived along with their computable forms.
1996, 18(6): 582-589.
Abstract:
This paper studies two kinds of methods for pitch predictor in speech compressing coding, i. e., open-loop and closed-loop structure. Some of simplified approachs for solving pitch predictor equation are suggested, and the performances are compared under several conditions. The computer simulation results are shown.
This paper studies two kinds of methods for pitch predictor in speech compressing coding, i. e., open-loop and closed-loop structure. Some of simplified approachs for solving pitch predictor equation are suggested, and the performances are compared under several conditions. The computer simulation results are shown.
1996, 18(6): 590-595.
Abstract:
This paper analyzes the optimization problem of mutation probability (Pm) in genetic algorithms by applying the definition of i-bit improved sub-space. Then fuzzy reasoning technique is adopted to determine the optimal mutation probability in different conditions. The superior convergence property of the new method is evaluated by applying it to two simulation examples.
This paper analyzes the optimization problem of mutation probability (Pm) in genetic algorithms by applying the definition of i-bit improved sub-space. Then fuzzy reasoning technique is adopted to determine the optimal mutation probability in different conditions. The superior convergence property of the new method is evaluated by applying it to two simulation examples.
1996, 18(6): 596-600.
Abstract:
This paper analyzes the relationship between capacity and dynamics in recurrent correlation neural network, and points out that in some conditions the recurrent correlation neural network has high memory capacity. Then this paper presents several methods for improving the performance.
This paper analyzes the relationship between capacity and dynamics in recurrent correlation neural network, and points out that in some conditions the recurrent correlation neural network has high memory capacity. Then this paper presents several methods for improving the performance.
1996, 18(6): 601-606.
Abstract:
A new learning algorithm for radial basis functional network, which is called ABS project learning algorithm, is given and computing results show that it can be used for pattern recognition and other areas.
A new learning algorithm for radial basis functional network, which is called ABS project learning algorithm, is given and computing results show that it can be used for pattern recognition and other areas.
1996, 18(6): 607-611.
Abstract:
A kind of access model of the contention-collision cancellation in multi-star LAN has been discussed, the mathematical model is built, and the mathematical result is also given.
A kind of access model of the contention-collision cancellation in multi-star LAN has been discussed, the mathematical model is built, and the mathematical result is also given.
1996, 18(6): 612-619.
Abstract:
This paper deals with a perfect digital circuit theory by using only one algebra which keeps to follow the Boolean algebra s laws and overcomes the difficulty with which the Boolean algebbra is faced. The new theory provides a good expression of any realistic circuit s structure which contains the signal, network and load. Several theorems on the switch operators ,||, and on the relations to transform from one type of circuits into another are proved. Based on these theorems a state equation method is proposed for analyzing dynamic circuits.
This paper deals with a perfect digital circuit theory by using only one algebra which keeps to follow the Boolean algebra s laws and overcomes the difficulty with which the Boolean algebbra is faced. The new theory provides a good expression of any realistic circuit s structure which contains the signal, network and load. Several theorems on the switch operators ,||, and on the relations to transform from one type of circuits into another are proved. Based on these theorems a state equation method is proposed for analyzing dynamic circuits.
1996, 18(6): 620-626.
Abstract:
The calculation of the scattered far-zone EM field produced by a crescentlike three-dimensional conductor under HF approximation is studied. The equivalent surface current distributions used in the calculation are obtained from the physical optics and Fock s theory. To take account of the contribution of the edge, a line distribution of charge along it is introduced. The calculated field data are applied to reconstruct the contour projections of the scatterer successfully.
The calculation of the scattered far-zone EM field produced by a crescentlike three-dimensional conductor under HF approximation is studied. The equivalent surface current distributions used in the calculation are obtained from the physical optics and Fock s theory. To take account of the contribution of the edge, a line distribution of charge along it is introduced. The calculated field data are applied to reconstruct the contour projections of the scatterer successfully.
1996, 18(6): 627-631.
Abstract:
This article presents the mutual coupling of conformal array on arbitrary surfaces with revolutional symmetry. The concept equivalent ring simplifies the array model in the method of equating arrays with unequal elements to arrays with the same elements in each ring. The method of decomposing the arbitrary excitation of arrays into a term of intrinsic excitations aviods the inversion of large matrixes and so reduces largely the computer tune, which is very important to the analysis and synthesis of conformal arrays.
This article presents the mutual coupling of conformal array on arbitrary surfaces with revolutional symmetry. The concept equivalent ring simplifies the array model in the method of equating arrays with unequal elements to arrays with the same elements in each ring. The method of decomposing the arbitrary excitation of arrays into a term of intrinsic excitations aviods the inversion of large matrixes and so reduces largely the computer tune, which is very important to the analysis and synthesis of conformal arrays.
1996, 18(6): 632-637.
Abstract:
A new modified circular microstrip antenna is researched, and a new method named for equivalent ellipse is presented to calculate the pattern, axial ratio and partial power gain. The theoretical results agree well with the experimental data.
A new modified circular microstrip antenna is researched, and a new method named for equivalent ellipse is presented to calculate the pattern, axial ratio and partial power gain. The theoretical results agree well with the experimental data.
1996, 18(6): 638-643.
Abstract:
To take the effects of strain induced splitting and non-parabolicity of valence band into account when calculating the bandgap narrowing (BGN) due to heavy doping in p-type pseu-domorphic Si1-xGex layers grown on 100 Si substrate, an equivalent effective degeneracy (EED) model is proposed for the valence band structure of the strained alloy. The calculation results agree very well with published experimental data and show that there is a maximum value of the BGN at a certain Ge fraction if dopant concentration exceeds about 2～3 1019cm-3, and that, otherwise, it will decrease continuously as Ge fraction increases.
To take the effects of strain induced splitting and non-parabolicity of valence band into account when calculating the bandgap narrowing (BGN) due to heavy doping in p-type pseu-domorphic Si1-xGex layers grown on 100 Si substrate, an equivalent effective degeneracy (EED) model is proposed for the valence band structure of the strained alloy. The calculation results agree very well with published experimental data and show that there is a maximum value of the BGN at a certain Ge fraction if dopant concentration exceeds about 2～3 1019cm-3, and that, otherwise, it will decrease continuously as Ge fraction increases.
1996, 18(6): 644-648.
Abstract:
Based on uniform circular array and its elements output signal delay, a novel method for estimation of spatial frequency, azimuth and elevation is presented. Without any spectral peak search and parameters pairing, the resulting method is computationally efficient with high resolution and small variance, even in the short data length. Computer simulation demonstrates the effictiveness of this method.
Based on uniform circular array and its elements output signal delay, a novel method for estimation of spatial frequency, azimuth and elevation is presented. Without any spectral peak search and parameters pairing, the resulting method is computationally efficient with high resolution and small variance, even in the short data length. Computer simulation demonstrates the effictiveness of this method.
1996, 18(6): 649-651.
Abstract:
The problem of the hardware realization of a special operation - the square operation is often encountered in the design of digital ASICs, especially the ASICs used in communication and signal processing area. From the study of the regular multiplier designed in VLSI circuit, a realization method for the square operation suitable for VLSI implementation is proposed in this paper. By means of simplifying the part products of the multiplication, big cuts have been made in the circuit scale of the new design.
The problem of the hardware realization of a special operation - the square operation is often encountered in the design of digital ASICs, especially the ASICs used in communication and signal processing area. From the study of the regular multiplier designed in VLSI circuit, a realization method for the square operation suitable for VLSI implementation is proposed in this paper. By means of simplifying the part products of the multiplication, big cuts have been made in the circuit scale of the new design.
1996, 18(6): 652-657.
Abstract:
A spline boundary element formulation for calculating parameters of high speed integrated transmission lines is presented, where the edge singularities of the charge near the corners of the cross section of lines are embedded. The new method demonstrates improved accuracy and enhanced computational efficiency in comparison to the previous methods.
A spline boundary element formulation for calculating parameters of high speed integrated transmission lines is presented, where the edge singularities of the charge near the corners of the cross section of lines are embedded. The new method demonstrates improved accuracy and enhanced computational efficiency in comparison to the previous methods.
1996, 18(6): 657-660.
Abstract:
By studying the structure of 16 dimension Barnes-Wall lattice and lattices resulting from binary linear block codes and quaternary linear block codes based on Construction A, decoding problem of the lattices can be transformed into the problem of finding the shortest path of trellises accordingly. The time complexities of the decoding algorithms are analyzed.
By studying the structure of 16 dimension Barnes-Wall lattice and lattices resulting from binary linear block codes and quaternary linear block codes based on Construction A, decoding problem of the lattices can be transformed into the problem of finding the shortest path of trellises accordingly. The time complexities of the decoding algorithms are analyzed.
1996, 18(6): 661-665.
Abstract:
Based on the quasi-2D analytic model for short-channel NMOSFET s in the temperature range of 77-295K, the substrate current (/SUB) related physical mechanism for 77-295K NMOSFET was investigated. It was discovered that the channel electron mean-free path was temperature independent with a value of about 7.6 nm. Although electrons could acquire larger energy at the drain end of the channel at lower temperatures, the /SUB did not increase as significantly as reported by Henning, et al.(1987), owing to the reduced impact ionization process. Agreement between calculations and experiments demonstrated the feasibility of the proposed mechanism in 77-295K.
Based on the quasi-2D analytic model for short-channel NMOSFET s in the temperature range of 77-295K, the substrate current (/SUB) related physical mechanism for 77-295K NMOSFET was investigated. It was discovered that the channel electron mean-free path was temperature independent with a value of about 7.6 nm. Although electrons could acquire larger energy at the drain end of the channel at lower temperatures, the /SUB did not increase as significantly as reported by Henning, et al.(1987), owing to the reduced impact ionization process. Agreement between calculations and experiments demonstrated the feasibility of the proposed mechanism in 77-295K.
