頻率捷變 的英文怎麼說
中文拼音 [bīnlǜjiébiàn]
頻率捷變
英文
fa-
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。By making full use of favourable narrow - band tracing filter character of pll and by combining the merits of dds such as super fine frequency resolution 、 high frequency accuracy 、 very fast frequency hoping with it, the pll / pll + dds frequency synthesizer presents wide band high quality source and super small frequency hoping step. while the electronically tuned filter abates the image interference and notably improves the selectivity. the theorem of frequency synthesizer and center - frequency - fixed filter is simply but adequately introduced first in this paper
課題中所採用的pll或dds pll鎖相頻率合成方法充分發揮鎖相環良好的窄帶跟蹤濾波特性，並結合dds的高頻率解析度、高頻率精確度和高速頻率捷變等優點，分別實現了系統所要求的高質量寬帶本振源和小步長頻率捷變；採用電調諧選頻技術，則大大改善了接收機的選擇性和抗干擾能力。The synthesizer with the low phase noise, highly pure spectrum and high - speed frequency agility has became the tendency to the frequency synthesis technology
低相位噪聲、高純頻譜和高速捷變的頻率合成器成為頻率合成技術發展的主要趨勢。This paper applies the technology of frequency agility to radio fuze which has been applied widely in the field of radaf and communication, and introduces a scheme of frequency agility and frequency modulation fixed - distance fuze which has good precision of fixed - distance and strong ability of anti - interference
本文將應用於雷達和通信領域的頻率捷變技術引入到無線電引信，提出了一種既具有較高定距精度，又具有較強抗干擾性能的新的頻率捷變調頻定距引信方案。As for mm - wave radars, they generally require frequency sources of full - coherence 、 high spectrum pureness and frequency - agile ability 。 this task was carried out just aiming at high ? performance mm - wave sources
本課題即是為研製低相噪、低雜散、窄步進、捷變頻的全相參毫米波頻率源而開展的。The load capacity and damage degree of bridge are detected by the curve of the transformation of vibration frequency in different attached load and different damage. a conclusion that the attached load method improves the of vibration frequency sensitivity to the physical property parameters of bridge structure is drawn at last. and the same time the paper bring forward a new and convenient technique of dynamic load test - - the attached load method
通過振動頻率在不同的附加荷載作用下、不同破損情況下的變化曲線來確定橋梁的承載能力以及破損程度，得出了附加荷載法改變了振動頻率對橋梁結構物理參數的弱靈敏性這一結論，提出了一種更為新穎、快捷的橋梁承載能力的動荷載檢測方法? ?附加荷載法。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。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。The paper presents the schematic of s - band frequency synthesizer and the main circuits modules upon which, by considering the electromagenetic comptiblity ( emc ), fractional frequency synthesizer is fabricated by both pll and dds, the performance of the prototype product is carefully measured
並製作成功了高解析度、快捷變的小數頻率合成器的板級樣品。最後，還進行了樣品的性能測試，另外，還結合該實驗產品，進行了電磁兼容分析。Synthesizers with low phase noise, highly pure spectrum, high resolution and fast frequency jump speed have dominating development direction of the frequency synthesis technology
低相位噪聲、高純頻譜、高解析度和高速頻率捷變成為頻率合成技術發展的主要趨勢。Then, detail discusses were given on. finally, on the basis of above analysis and research, by comparing various design methods, a l band agile frequency synthesizer with 256mhz bandwidth and 1mhz resolution was designed, whose switching time was within 4 us. however, the spur performance is to be improved
最後，在對各種捷變頻技術綜合分析和研究的基礎上，經過反復的方案比較論證，設計了一個l波段256mhz帶寬，步進為1mhz的捷變頻頻率合成器，捷變時間在4 s以內，不過雜散指標還有待進一步改進。Using advanced electronic control, and to import a high - precision electromagnetic clutch 、 brake 、 agile and accurate
採用先進的電子控制，配有高精度進口變頻數碼信號驅動，動作敏捷、準確。低噪音、耗電省、送料準、效率高。分享友人