time hopping 中文意思是什麼
time hopping
解釋
跳時-
On the base of researching the theory of the scheme and analyzing the signal feature, it is obtained that the existence manners and character of distance information in the differential frequency signal. at the same time, a new conclusion is gained that the technology of frequency agility can decrease the constant error of system. it is also to say that frequency agility and frequency modulation fixed - distance fuze has the similar feature to random period frequency modulation fixed - distance fuze. according to the theory of address coding in the hopping - frequency communication, the paper presents the principle of selecting the frequency agility sequence which fit to the radio fuze and constructs the frequency agility sequence family based on the rs codes
在深入研究方案原理和分析信號特徵的基礎上，獲得了該體制引信差頻信號中，距離信息的存在形式和特點，得出了頻率捷變技術的引入降低了系統定距固定誤差這一新的結論，即頻率捷變調頻定距引信在定距性能上具有類似隨機周期調頻定距的特徵。本文引入跳頻通信地址編碼理論，結合無線電引信的具體特徵，提出了適用於無線電引信的頻率捷變序列的選擇原則，並構造了基於rs碼的寬間隔頻率捷變序列族。 -
The synchronization of frequency hopping method referenced the jtrs radio system of usa military, and designed a synchronization method used in our radio include creating the frequency hopping map and the base band frame architecture in frequency hopping mode. the paper also analyzed the synchronization capability on theory. it has been proved correct on theory by showing the false probability, capture probability and the synchronization time
對跳頻圖案的產生和跳頻的幀結構，本文不僅從理論上分析了同步性能，給出了虛警概率和檢測概率，估算了同步的捕獲時間，證明均能滿足系統指標要求，而且通過與合作單位進行的整機聯調和實測證實了該方案的可行性。 -
( c ) propose the scheme to implementing the coder and deoder of optical time - spreading / frequency - hopping, by assigning two orthogonal codes for one user and using these two codes to encoding 1 and 0 respectively, differential detection can be adopted. not only improves system performances in ber, but also resists the interference such as mai, and does n ' t need any control devices to evaluate the optimum decisive threshold
通過給每個用戶指定互相關為0的兩個地址碼分別發送1和0信號以及在接收端採用差分檢測技術，避免了ook （開關鍵控）光通信系統中0不發送光脈沖和ook常規檢測方式下最佳判決門限必須根椐用戶數等外界環境而改變，從而提高了系統性能和降低了系統的復雜度。 -
All this time it was incessantly hopping on behind and gaining on him, so that when the boy got to his own door lie had reason for being half dead
那玩藝兒也鉆進路上的影子里，狡猾地躺著，想絆他摔筋頭，又一直跟在身後，而且越來越逼近了。 -
In the past years, i most liked winters. when snow was dancing in the sky, parent didn ' t let me do housework again, i could play happyly with my friends. i could wear my new clothing that i looked forward to when it was lasting snow, i felt like a bird that was flying in the snowing sky when i wore my new clothing. when that time, my neigbours could see a girl in red hopping, stretching out her tongue to meet snowflakes. the feetprint were dancing behind her
小時候，一年當中我最喜歡冬天，當雪花在空中飛舞的時候，我就可以不用再做家務，可以盡情的和小朋友玩耍.當大雪不停的下時，我就有新的衣服可穿了，穿著盼望以久的新衣，心隨著雪花綻放.這時人們在大街上就可以看見一個蹦蹦跳跳的小姑娘，穿著鮮紅衣服的小姑娘時不時的伸出舌頭去接雪花，在她身後留下兩串快樂的腳印，在映雪跳舞 -
While i love this time of year refuse to compain about fun of gift giving and pa rty hopping, managing it all can be stressful
我喜歡一年中的這段時間，送禮赴宴趕舞會樂而無怨，但是要把這一切都安排處理好卻太緊張了。 -
The last gives the target of this paper. chapter 2 introduces the theory of frequency - hopping and gmsk, at the same time gives out a feasible method of fh synchronization and data transmission
第二章研究了跳頻系統的基本原理和參數特徵，並根據對實際戰場中的干擾分析和數傳同步的特點給出了一種跳頻同步方法和數據傳輸機制。 -
Spread spectrum communication technology can be classified into four catalogs : direct sequence spread spectrum, frequency hopping, time hopping and chirp
擴頻技術種類較多，主要包括直接序列擴頻、跳頻、跳時和線性調頻。 -
Then we introduce pulse position modulation ( ppm ) using pn code and analysis its multi - access performance, system capacity and power spectrum density. on the basis of those analyses, we study the pulse shape and the anti - jamming ability of the system. at last, multiple access with pseudochaotic time hopping is introduce
本文首先闡述了uwb脈沖通信系統的基本原理，重點介紹了用偽隨機碼跳時的ppm （脈沖位置調制）調制，分析了他的多址性能、系統容量和功率譜密度，在此基礎上研究了改進性能的發射信號形狀和系統抗干擾能力，最後介紹了偽混沌碼跳時的多址方式。 -
In this paper, using the three - state hopping model firstly, we discuss the characteristic time to reach the steady state for the potassium channel and illuminate the validation of the model to transient behaviors
另外，本文首次利用這一三態跳躍模型討論了鉀離子通道到達穩態的特徵時間，說明這一模型的建立對暫態特徵也是有效的。 -
Fsk / psk radar signal is the signal with both fsk and psk modulation at one time. it is with large bandwidth time product ( bt ), thumbtack - like ambiguity function and well ability of anti - emi. the fsk / psk signals of which the frequency - hopping and bi - phase sequences were randomly chosen often have high sidelobe level
Fsk / psk信號是同時進行頻移鍵控（ fsk ）和相移鍵控（ psk ）調制的信號，該信號具有大時帶寬積（ bt ）和高分辨特性，並具有「圖釘型」模糊圖結構、低截獲概率（ lpi ）特性和較好的抗干擾能力，受到了廣泛的重視。 -
Chapter 3 considers location of a stationary target with time - varying emitting signal, such as frequency hopping signal and linear fm signal
在第三章里，主要研究了頻率時變信號（如頻率捷變信號和線性調頻信號）的定位演算法。 -
In this paper, bit - error rate performance analyses are presented for coded and un - coded frequency hopping m - ary frequency - shift keyed systems under the condition of additive white gaussian noise ( awgn ) and partial band noise jamming and multitone jamming. the use of error - correct codes provide a way to improve the performance of frequency hopping system, particularly the use of reed - solomon code in a fh system under the condition of partial band noise jamming can greatly improve the performance of system. so we provide the way of coding and decoding of rs code in c language. in the end, we offer the simulation of the performance of time diversity fh / 2fsk system over partial band jamming noise channels
第一章為緒論，敘述跳頻通信的發展趨勢，以及基本概念，第二章及第三章介紹提高抗部分頻帶干擾的前向糾錯碼reed - solomon碼的原理和實現方法。第四章研究跳頻通信系統在各種干擾條件下的性能。最後在第五章以fh mfsk系統為例，探討在部分頻帶干擾下的系統性能，並進行計算機模擬，模擬結果表明採用分集技術和各種編碼技術對于系統的性能改善具有明顯的效果。 -
To assure that the hybrid ds - fh spread - spectrum communication mode has better capability of information safety and inference suppression, i bring forward a design scheme of ds - fh spread - spectrum communication system and solving effectively the crucial problem such as how to choose the user address, how to choose the hopping frequency and how to avoid the collision of the frequency which is used by different users at the same time
為保證系統可靠、有效地工作，本文提出了一種ds - fh混合擴頻系統的設計方案，並且有效地解決了系統的用戶選址、頻率選擇和頻率碰撞等關鍵問題。通過系統設計模擬證實了ds - fh混合擴頻系統具有優于ds系統的抗干擾性能，並在一定程度上提高了系統的抗遠近效應能力。 -
The essential requirements for the frequency synthesizer are : 1 ). low side band power 2 ). high hopping speed 3 ). short convergence time direct digital synthesis technology has the advantages of low cost, low power consumption, high frequency discrimination and short switching time
直接數字合成技術dds具有低成本、低功耗、高解析度和快速轉換時間等優點，是實現快速跳頻的一個關鍵技術。本文討論了如何實現高速的跳頻系統。 -
It has been proven that the spread spectrum technologies have good capabilities of overcoming isi in electromagnetic wireless channel. the feasibilities of their applications to underwater acoustic channel have been analyzed, the frequency hopping technology is chosen. instead of using time - frequency diversity, convolutional coding and viterbi decoding are employed to combat signal fading, consequently the bit - rate and bit - error - rate performance of the underwater acoustic voice communication system can be balanced and controlled
由於擴頻技術在抗碼間干擾方面具有優良的特性，因此在分析了各種擴頻技術于本研究應用的可行性之後，確定了跳頻技術作為具體實現方案；在克服幅度衰落方面，選用卷積編碼和維特比譯碼方法來替代原有的分集技術以綜合調節系統的通信速率與誤碼性能，達到差錯可控的目的。 -
Frequency ’ s switching time, which directly affects the hopping speed of interferential system as well as radar ’ s frequency agility, is being paid more and more attention. this paper mainly analyzed the frequency synthesizer ’ s agile character
其中，捷變時間這一指標，由於直接影響到跳頻干擾和抗干擾系統的跳速，以及雷達頻率捷變特性，越來越受到人們的關注。 -
Chapter 2 introduces the theory of frequency - hopping and omsk, at the same time gives out a fh - gmsk radio model in high frequency band under the matlab simulink environment. chapter 3 respectively proposes the parameter blind estimation algorithms for high - speed - hop and low - speed - hop fh signals based on smoothed pseudo wvd ( spwvd ). furthermore, the simulation results are given to demonstrate the algorithms performance
第三章用「平滑偽wvd （ spwvd ） 」時頻分析技術分別研究了對高速跳和低速跳的跳頻信號的參數盲估計演算法，並對這兩種演算法，分別在matlab的環境下做了模擬和性能分析。 -
The de - hopping and digital intermediate frequency receiver can either do the real - time de - hopping processing or be used as a software radio receiver
需要實現的跳頻解跳與數字中頻接收機既能對跳頻信號進行實時解跳，又能做為一臺軟體無線電接收機使用。 -
The thesis that did the research focusing on the realization of real - time de - hopping processing, introduces the hardware and software models of the de - hopping and digital intermediate frequency receiver and describes the key part of the design
本文將對跳頻信號的實時解跳處理進行研究，著重對跳頻解跳與數字中頻接收機的實現上進行論述，並介紹該接收機的軟硬體模型，對實現方案的重要環節進行闡述。
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