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1999 Vol. 21, No. 4
Display Method:
1999, 21(4): 433-440.
Abstract:
Joint Probabilistic Data Association (JPDA) is a very fine optimal multitarget tracking and association algorithm in clutter. However, the calculation explosion effect in computation of association probabilities has been a difficulty. This paper will...
Joint Probabilistic Data Association (JPDA) is a very fine optimal multitarget tracking and association algorithm in clutter. However, the calculation explosion effect in computation of association probabilities has been a difficulty. This paper will...
1999, 21(4): 441-446.
Abstract:
The theory of distributed inference and decision is a kind of theory to be used to solve the distributed interwound decision problems. This theory is first presented to solve the problem of target data association in this paper. The basic principle a...
The theory of distributed inference and decision is a kind of theory to be used to solve the distributed interwound decision problems. This theory is first presented to solve the problem of target data association in this paper. The basic principle a...
1999, 21(4): 447-454.
Abstract:
The paper gives a detail analysis of the mathematical principle of the RELAX algorithm that separating and resolving the signals, and the performance of the characters of the separation and resolution in the circumstance that the algorithm resolves t...
The paper gives a detail analysis of the mathematical principle of the RELAX algorithm that separating and resolving the signals, and the performance of the characters of the separation and resolution in the circumstance that the algorithm resolves t...
1999, 21(4): 455-460.
Abstract:
Fast recovery and frequency-shifting of real bandpass signal based on second-order sampling is discussed. Using FFT and complex filtering, real bandpass signal can be recovered as a analytic signal whose central frequency is within two times of its b...
Fast recovery and frequency-shifting of real bandpass signal based on second-order sampling is discussed. Using FFT and complex filtering, real bandpass signal can be recovered as a analytic signal whose central frequency is within two times of its b...
1999, 21(4): 461-466.
Abstract:
The main methods for estimation of cyclic spectra for cyclostationary processes are temporally smoothed cyclic periodogram and spectrally smoothed cyclic periodogram. In case of short record length, both methods have low resolution and reliability. T...
The main methods for estimation of cyclic spectra for cyclostationary processes are temporally smoothed cyclic periodogram and spectrally smoothed cyclic periodogram. In case of short record length, both methods have low resolution and reliability. T...
1999, 21(4): 467-472.
Abstract:
Short time Fourier transform and pseudo-Wigner distribution are two most useful tools in time-frequency analysis, the choice of window functions is the base for their applications, which require deep study. The criteria of window functions are discus...
Short time Fourier transform and pseudo-Wigner distribution are two most useful tools in time-frequency analysis, the choice of window functions is the base for their applications, which require deep study. The criteria of window functions are discus...
1999, 21(4): 473-481.
Abstract:
The relationship between the discrete Fourier transform (DFT) and the symmetrical/Asymmetrical number system (SNS/ANS) is introduced in this paper. And the influence of noise upon the solution to an ambiguity problem in number system is also discusse...
The relationship between the discrete Fourier transform (DFT) and the symmetrical/Asymmetrical number system (SNS/ANS) is introduced in this paper. And the influence of noise upon the solution to an ambiguity problem in number system is also discusse...
1999, 21(4): 482-487.
Abstract:
The concern here is retrieval of multiple tone harmonics observed in complex-valued multiplicative noises with zero mean. Cyclic statistics have proved to be useful for harmonic retrieval in the presence of complex-valued multiplicative noises with z...
The concern here is retrieval of multiple tone harmonics observed in complex-valued multiplicative noises with zero mean. Cyclic statistics have proved to be useful for harmonic retrieval in the presence of complex-valued multiplicative noises with z...
1999, 21(4): 488-493.
Abstract:
Range-Doppler method is the most common method in ISAR imaging. To obtain radar image of a target, certain angle of the target with respect to Radar Light Of Sight (RLOS) during the coherent integration interval is required. In some case, there will ...
Range-Doppler method is the most common method in ISAR imaging. To obtain radar image of a target, certain angle of the target with respect to Radar Light Of Sight (RLOS) during the coherent integration interval is required. In some case, there will ...
1999, 21(4): 494-499.
Abstract:
Impersonation and eavesdropping are the crucial threats in wireless communication systems. In personal communication systems (PCS), it is necessary to provide security protection on the voice/data transmitted over wireless links, and perform mutual a...
Impersonation and eavesdropping are the crucial threats in wireless communication systems. In personal communication systems (PCS), it is necessary to provide security protection on the voice/data transmitted over wireless links, and perform mutual a...
1999, 21(4): 500-505.
Abstract:
CBR is one of the most important kinds of real-time traffic in ATM network. Guarantying the quality of service(QOS) of CBR traffic is crucial to the success of ATM technology. So, analyzing the QOS of the CBR traffic is worth studying. The paper anal...
CBR is one of the most important kinds of real-time traffic in ATM network. Guarantying the quality of service(QOS) of CBR traffic is crucial to the success of ATM technology. So, analyzing the QOS of the CBR traffic is worth studying. The paper anal...
1999, 21(4): 506-510.
Abstract:
In this paper, a novel moving picture coding algorithm, called the adaptive multilevel quantized subsampled block truncation coding is presented. The experiments show that this algorithm has better performance than the other algorithms of the same ki...
In this paper, a novel moving picture coding algorithm, called the adaptive multilevel quantized subsampled block truncation coding is presented. The experiments show that this algorithm has better performance than the other algorithms of the same ki...
1999, 21(4): 511-515.
Abstract:
Key escrow systems have gained much attention in recent years. A key escrow system can provide cryptographic protection to sensitive data ,while at the same time, allows for the decryption of encrypted message under lawful authorization. Since the pu...
Key escrow systems have gained much attention in recent years. A key escrow system can provide cryptographic protection to sensitive data ,while at the same time, allows for the decryption of encrypted message under lawful authorization. Since the pu...
1999, 21(4): 516-521.
Abstract:
In this paper a threshold secret sharing scheme to identify cheaters is proposed by using authentication codes.The performance of the scheme is discussed. The results show that in the scheme the valid shareholders not only can identify the impersonat...
In this paper a threshold secret sharing scheme to identify cheaters is proposed by using authentication codes.The performance of the scheme is discussed. The results show that in the scheme the valid shareholders not only can identify the impersonat...
1999, 21(4): 522-528.
Abstract:
An approach to generate a multi-energy electron beam by transmitting a monoen-ergetic beam though a solid film is proposed. The energy (velocity) spectrum of the resultant beam is predicted by Monte Carlo simulation of electron scattering. The calcul...
An approach to generate a multi-energy electron beam by transmitting a monoen-ergetic beam though a solid film is proposed. The energy (velocity) spectrum of the resultant beam is predicted by Monte Carlo simulation of electron scattering. The calcul...
1999, 21(4): 529-535.
Abstract:
In this paper, parallel corner feeding with two ports is proposed to realize the high isolation, dual-polarized microstrip antenna. A novel dual-polarized feedline network is designed for the array. A method of analysis is developed, which is based o...
In this paper, parallel corner feeding with two ports is proposed to realize the high isolation, dual-polarized microstrip antenna. A novel dual-polarized feedline network is designed for the array. A method of analysis is developed, which is based o...
1999, 21(4): 536-542.
Abstract:
Based on a quaternary algebra, this paper presents a unified theory of ternary circuits-theory of three essential circuit elements (signal, network and load). The theory shows that a simple transform relation exists between ternary gate stage and swi...
Based on a quaternary algebra, this paper presents a unified theory of ternary circuits-theory of three essential circuit elements (signal, network and load). The theory shows that a simple transform relation exists between ternary gate stage and swi...
1999, 21(4): 543-548.
Abstract:
An MSM photodiode equivalent circuit model based on external microwave port characters are presented in this paper, while the parameters of DC and capacitance model preserve the physical meaning. The circuit simulation results are agree with experime...
An MSM photodiode equivalent circuit model based on external microwave port characters are presented in this paper, while the parameters of DC and capacitance model preserve the physical meaning. The circuit simulation results are agree with experime...
1999, 21(4): 549-552.
Abstract:
Synaptic connection matrix encodes limited information. It is well known that neural network memory with storage prescriptions based on Hebb s rule will collapse as more patterns are stored. By requiring that old patterns are automatically forgotten ...
Synaptic connection matrix encodes limited information. It is well known that neural network memory with storage prescriptions based on Hebb s rule will collapse as more patterns are stored. By requiring that old patterns are automatically forgotten ...
1999, 21(4): 553-556.
Abstract:
Foliage penetrating (FOPEN) VHF/UHF SAR can image hidden man-made targets with wide-angle and ultra-wideband to achieve both range and azimuth with high resolutions. The target can be modeled by dihedral formed between its side and the ground due to ...
Foliage penetrating (FOPEN) VHF/UHF SAR can image hidden man-made targets with wide-angle and ultra-wideband to achieve both range and azimuth with high resolutions. The target can be modeled by dihedral formed between its side and the ground due to ...
1999, 21(4): 557-560.
Abstract:
The parallel attack is discussed in this paper from the semantics, and the method of decision is presented.
The parallel attack is discussed in this paper from the semantics, and the method of decision is presented.
1999, 21(4): 561-564.
Abstract:
This paper points out the drawback of the secret sharing schemes proposed by J.He, et al. (1994) and L. Harn(1995). This paper also gives the secret sharing schemes, which overcome the above mentioned drawback.
This paper points out the drawback of the secret sharing schemes proposed by J.He, et al. (1994) and L. Harn(1995). This paper also gives the secret sharing schemes, which overcome the above mentioned drawback.
1999, 21(4): 565-568.
Abstract:
The radiation field formulas are given for a parabolic torus reflector antenna. A five-beam parabolic torus antenna with 90?azimuth coverage has been designed and developed. An experimental radiation pattern of these five beams and theoretical patter...
The radiation field formulas are given for a parabolic torus reflector antenna. A five-beam parabolic torus antenna with 90?azimuth coverage has been designed and developed. An experimental radiation pattern of these five beams and theoretical patter...
1999, 21(4): 569-572.
Abstract:
A symmetric double-layer frequency selective surface is studied by adopting the symmetric and anti-symmetric excitation method. Transmission properties of the structure are discussed for different dielectric parameters of the structure. It is shown t...
A symmetric double-layer frequency selective surface is studied by adopting the symmetric and anti-symmetric excitation method. Transmission properties of the structure are discussed for different dielectric parameters of the structure. It is shown t...
1999, 21(4): 573-576.
Abstract:
To improve the precision of the outer measuring system,the accuracy of radiowave refractive correction must be raised. The refractive correction's formulation in the assumption of atmospheric ballface stratification does not meet the requirements,bec...
To improve the precision of the outer measuring system,the accuracy of radiowave refractive correction must be raised. The refractive correction's formulation in the assumption of atmospheric ballface stratification does not meet the requirements,bec...
