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Identification algorithm for a kind of fractional order system 被引量:5
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作者 王振滨 曹广益 朱新坚 《Journal of Southeast University(English Edition)》 EI CAS 2004年第3期297-302,共6页
The state-space representation of linear time-invariant (LTI) fractional order systems is introduced, and a proof of their stability theory is also given. Then an efficient identification algorithm is proposed for tho... The state-space representation of linear time-invariant (LTI) fractional order systems is introduced, and a proof of their stability theory is also given. Then an efficient identification algorithm is proposed for those fractional order systems. The basic idea of the algorithm is to compute fractional derivatives and the filter simultaneously, i.e., the filtered fractional derivatives can be obtained by computing them in one step, and then system identification can be fulfilled by the least square method. The instrumental variable method is also used in the identification of fractional order systems. In this way, even if there is colored noise in the systems, the unbiased estimation of the parameters can still be obtained. Finally an example of identifying a viscoelastic system is given to show the effectiveness of the aforementioned method. 展开更多
关键词 fractional order systems state-space representation system identification fractional order Poisson filter least square method instrumental variable method
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Optimal design study of high order FIR digital filters based on neural network algorithm 被引量:2
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作者 Wang Xiaohua & He YigangCollege of Electrical and Information Engineering, Hunan University, Changsha 410082, P. R. China College of Electrical and Information Engineering, Changsha University of Science and Technology,Changsha 410077, P. R. China 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2004年第2期115-119,130,共6页
An optimal design approach of high order FIR digital filter is developed based on the algorithm of neural networks with cosine basis function . The main idea is to minimize the sum of the square errors between the amp... An optimal design approach of high order FIR digital filter is developed based on the algorithm of neural networks with cosine basis function . The main idea is to minimize the sum of the square errors between the amplitude response of the desired FIR filter and that of the designed by training the weights of neural networks, then obtains the impulse response of FIR digital filter . The convergence theorem of the neural networks algorithm is presented and proved, and the optimal design method is introduced by designing four kinds of FIR digital filters , i.e., low-pass, high-pass, bandpass , and band-stop FIR digital filter. The results of the amplitude responses show that attenuation in stop-bands is more than 60 dB with no ripple and pulse existing in pass-bands, and cutoff frequency of passband and stop-band is easily controlled precisely .The presented optimal design approach of high order FIR digital filter is significantly effective. 展开更多
关键词 high order FIR digital filters amplitude-frequency response neural network convergence theorem optimal design.
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Fuzzy Ordered Filters in Implicative Semigroups
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作者 库热西 黄文平 《Chinese Quarterly Journal of Mathematics》 CSCD 1998年第2期53-57, ,共5页
We fuzzify the concept of ordered filter in implicative negatively partially ordered semigroups and study its properties.
关键词 implicative) negatively partially ordered semigroup ordered filter fuzzy ordered filter level ordered filter
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The TBD method for dim targets based on multi-level crossover and matching operator 被引量:1
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作者 张海英 段鸿 廖明宏 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2011年第1期57-61,共5页
In order to improve the tracking performance in this paper following TBD(Track before Detection) framework multi-level crossover and matching operator is presented.In data association stage the greedy principle is ado... In order to improve the tracking performance in this paper following TBD(Track before Detection) framework multi-level crossover and matching operator is presented.In data association stage the greedy principle is adopted to handle time complexity in DPA and at the same time crossover mathing operator is given to construct candidate trajectory.In addition the corresponding strategy is introduced in preprocessing and postprocessing to remove clutter and suppress false alarm rate.By the experimental comparison and analysis it can be found that the method is more perfer to strengthen the tracking performance of targets with SNR < 2.0 dB. 展开更多
关键词 track before detection high order correlation filter crossover operator dynamie programming
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The Semigroup Characterizations of Positive Implicative BCK-algebras
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作者 徐少贤 黄文平 《Chinese Quarterly Journal of Mathematics》 CSCD 1998年第3期86-90, ,共5页
Adjoint semigroups of BCI algebras were introduced by Huang [1] and some of its important properties were obtained. In this paper,some characterizations of positive implicative BCK algebras are given by discussing the... Adjoint semigroups of BCI algebras were introduced by Huang [1] and some of its important properties were obtained. In this paper,some characterizations of positive implicative BCK algebras are given by discussing the adjoint semigroups. Moreover,the semigroup differences between positive BCK algebras and implicative BCK algebras are discussed,and some semigroup characterizations of implicative BCK algebras are given. 展开更多
关键词 positive implicative BCK algebra implicative BCK algebra adjoint semigroup ideal order filter
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