chaotic signals 中文意思是什麼
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In accordance with chaotic essence of speech signals, syllable segmentation in continuous speech is researched by fractal theory. an approach of syllable segmentation using variance fractal dimension is proposed, its performance is analyzed in detail. the method can discriminate between voiced and unvoiced, between surd and sonant, but it can hardly discriminate between sonant
本文根據語音信號的混沌本質，利用分形理論研究了漢語連續語音中的音節分割問題，提出了基於方差分形維數的音節分割方法，並詳細分析了該方法的性能，它能很好地解決了無聲與有聲、濁音與清音間的分割問題，但很難解決濁音間的分割問題，當濁音相連且過渡段較短時，該方法無法實現它們之間的分割。 -
The results showed that it is feasible to use chaotic jamming signals as mask jamming sources. its jamming effectiveness is equivalent to that of random signal and superior to that of m sequence
結果表明，混沌干擾信號可以作為遮蓋性干擾信號的干擾源，其遮蓋效能與隨機信號相當，且優于m序列干擾信號。 -
Do a estimation is often encountered in vary application of radar and communication system. the dissertation then discusses the estimation of interested signals in chaotic noise. we analyzed three different algorithm for this purpose
混沌背景中的有用信號的參數估計問題是在雷達應用（如波達方向估計）和混沌調制的通信系統中窄帶干涉抵消中經常遇到的重要問題之一。 -
A potentially feasible method is the use of a chaotic system ' s high sensitivity under condition to detect weak signals, which is quite different from all present methods. fixing parameter of components in a nonlinear circuit, chaotic orbits change with the measured signal. a distance has been defined
利用混沌系統的初值敏感性進行小信號測量是一個很好的有應用潛力的方向，它的測量原理與現有的測量原理完全不同，其基本思想是將待測信號作為混沌系統的初值，在參數不變的條件下，利用混沌系統的初值敏感性，使混沌軌道隨待測信號的變化而變化，定義軌道距離，通過測量軌道距離的變化即可測得該小信號。 -
Compared with dcsk modulation, the fm - dcsk modulation changed the chaotic signals with random magnitude into the signal with constant magnitude and random frequency, thus the systemic noise performance is achieved
將振幅隨機變化的混沌信號變為頻率隨機變化而振幅恆定的混沌fm信號，降低了系統的誤比特率。 -
3. the detection of delicate signals in chaotic noise is studied
3 、研究了混沌噪聲中微弱信號的檢測問題。 -
This error - based detecting method is improved, that is, predicting the chaotic noise is changed to estimating the chaotic noise. a predicting method is improved to an estimating method to estimate the chaotic noise. then the time used to train the parameters is saved, and no invalid detection will be gotten even if signals come into
4 、改進了誤差檢測方法，即，將預測混沌噪聲改為估計混沌噪聲，並改進了一種非線性預測演算法，將其用於估計混沌噪聲，省去了參數訓練的時間，避免了參數尚未訓練好時就有信號進入背景噪聲中，而使檢測無效的情況。 -
2. the characteristics of stochastic and chaotic signals have been studied
對隨機信號和混沌信號的特性進行了分析比較。 -
By thorough study of chaos, more and more researches show that a lot of weak signals are embedded in the strong chaotic noise
隨著對混沌學的深入研究，越來越多的科學研究表明很多微弱信號湮沒在具有混沌行為的背景信號里。 -
Detection of weak signals in powerful chaotic and noisy background
強混沌和噪聲背景下微弱信號的檢測 -
The main contents of this dissertation are follows : the mathematical model of chaos is discussed deeply from mathematical map, statistical viewpoint for the purpose of analysis and synthesis chaotic signal. the dissertation analysis chaotic signals deeply, mainly about the correlation property ( including auto - correlation and cross correlation ) and lyapunov exponent. the study shows the ideal auto correlation and cross correlation of the chaotic signals by using theoretical derives and computer simulations
本文首先對混沌信號的數學模型進行了深入的討論，並分別從數學映射、統計學角度對其數學模型進行了全面的研究，特別是全面總結了混沌系統的統計學模型的研究成果，討論並給出了混沌與噪聲的區別與相似之處；雷達信號處理的重要一步是雜波中的信號檢測問題。 -
Chaotic switching modulation signals generated from different chaos sequences have been used to control smps. the effect of reducing the level of emi be compared. simulation results demonstrate : in the cpwm and cppm, chaos sequences generated from henon map is superior to the one generated from chua ' s circuit at lower multiples of switching frequency on reducing the level of emi ; in the ccfmfd, it has contrary results ; in the ccfmvd, chaos sequences generated from chua ' s circuit is superior to the one generated from henon map
模擬結果表明： cpwm和cppm模式下， henon映射混沌序列在較低次諧波處降低emi水平的效果要好於蔡氏電路混沌序列的效果。 ccfmfd模式則有相反的結果。對ccfmvd模式，蔡氏電路混沌序列比henon映射混沌序列降低emi水平的效果明顯要好。 -
However there are some signals different from the two poles, named chaotic signals, which are generated by a determinate system but acting similar to stochastic signal and can not be forecasted in long term
而混沌信號有別于這兩大類信號，它由確定性系統產生，但行為卻貌似隨機信號，具有長期不可預測性。 -
3. making a deep research on weak sinusoid signal detection using duffing oscillators and combining chaos critical state detection method with general detection methods, this dissertation realizes weak sinusoid signal detection below - 50db snr. furthermore, starting from the analysis of the intermittent chaotic motion occurring in the detecting process, an array of duffing oscillators are used to estimate the frequency of weak sinusoid signals accurately
（ 3 ）全面深入地研究了duffing振子用於微弱正弦信號檢測的機理，並把混沌臨界狀態檢測法和傳統檢測方法相結合，實現- 50db以下超低信噪比的微弱正弦信號檢測;建立了混沌振子陣列，實現低信噪比下正弦信號頻率的估計。 -
Correlation characteristic of chaotic sequences have been studied. it demonstrate that chaotic sequences have the same characteristics as chaotic signal. replaced the random signals with chaotic signals, all kinds chaotic switching modulation mode can be obtained
將著名「蔡氏電路」產生的混沌開關調制信號用於buck型dc dc變換器開關的調制控制，使其工作在基於混沌的隨機模式。 -
Based on the special property of chaotic signals, we presented the chaotic radar signals. additional, we introduce the chaotic sequence to the digital watermark technique. to sum up, the contribution of this dissertation are as following : the main progress and some statistical results of chaotic signals are summed up, the similarity and distinguish between chaos and noise are discussed and shown out
總結本文的主要貢獻主要有以下幾點:聖首先對混沌理論的研究現狀和基本數學結論進行了總結和分析，特別是對混沌信號進行了深入地分析，研究了其相關特性（譜特性） 、最大ly即unov指數，對這兩個方面進行了大量的理論推導和數值模擬。 -
By means of the proposed reinforcement learning algorithm and modified genetic algorithm, neural network controller whose weights are optimized could generate time series small perturbation signals to convert chaotic oscillations of chaotic systems into desired regular ones. the computer simulations on controlling henon map and logistic chaotic system have demonstrated the capacity of the presented strategy by suppressing lower periodic orbits such as period - 1 and period - 2. meanwhile, the periodic control methodology is utilized, the higher periods such as period - 4 can also be successfully directed to expected periodic orbits
該控制方法無需了解系統的動態特性和精確的數學模型，也不需監督學習所要求的訓練數據，通過增強學習訓練方式，採用改進遺傳演算法優化神經網路權系數，使之成為混沌控制器，便可產生控制混沌系統的時間序列小擾動信號，模擬實驗結果表明它不僅能有效鎮定混沌周期1 、 2等低周期軌道，而且在周期控制技術基礎上，也可成功將高周期混沌軌道（如周期4軌道）變成期望周期行為。 -
Firstly, the artificial neural networks of bp and its improved algorithms which are both simple, direct in structure and algorithm, and also full - grown in the research and apply field is employed. the controlling algorithm used for training the network is based on the chaos control scheme developed by ott, grebogi and yorke. according to the linear and nonlinear functions, the networks is trained to generate small disturbance time series signals necessary for suppression nonlinear chaotic motion as chaos controller
首先採用網路結構及其演算法直觀、簡單，研究和應用較為成熟的bp及其改進演算法的神經網路，以ogy混沌控制策略為基礎，分別用線性和非線性函數訓練網路，產生混沌穩定所需的時間序列小擾動控制信號，並用所設計的方法對二維henon混沌非線性映射進行了有效的控制。 -
Based on existing fractal and chaotic theory, nonlinear theory was used to anlysis conductance fluctuating signals of oil - water two phase flow in vertical upward flow pipes for 51 % kw 91 % and 10 m3
本文利用非線性理論，在已有的分形和混沌理論基礎上，進一步討論了用信息熵識別油水兩相流流態的問題。 -
But they have the disadvantages such as poor complexity, poor security and insufficient amount of sequence numbers among the family of codes, the chaotic signals have noise ? ike, broadband frequency spectrum, they can be used as spreading codes, furthermore, chaos system is extremely sensitive on initial conditions so that the various initial conditions given by chaos system can provide with large sum of spreading sequences and this can meet the demand of cdma, this thesis sets out to study on using chaos system to generate spreading sequence s, there are two parts is this paper : firstly, we study the basic theory of spread ? pectrum communication and the characteristics of chaos so as to prove the applicability of chaos system to be used in spread ? pectrum ii communication system
現在使用的擴頻碼有m序列， gold碼和r - s碼等，這些擴頻碼具有良好的隨機性，但普遍存在著復雜度低、保密性差以及同一碼族序列數目少等缺點。混沌信號具有類似噪聲、寬帶連續頻譜的特徵，正符合擴頻通信中對擴頻碼的要求，而且混沌系統對初始值極其敏感，可以通過給混沌系統賦予不同的初始值得到為數眾多、不相關的擴頻序列，這正好滿足碼分多址的要求。本文對利用混沌系統應用於擴頻通信作了一些研究工作，主要包括兩部分：第一部分：探討了擴頻通信的基本理論和混沌的基本特性，說明將混沌系統應用於擴頻通信系統的可行性。
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