frequency-shift 中文意思是什麼
frequency-shift
解釋
頻率偏移-
The realization of quick acquest under very low snr and big frequency shift is one of the key problems of lpi radar. we designed a new receiver which needs less computation spend without any decline of the performance of the radar
如何在較低輸入信噪比和較大頻偏的條件下實現擴頻碼快速捕獲是碼同步的難點，本文在不損失系統性能的基礎上，設計了一種結構簡單的接收機實現方案。 -
The earth's rotation and its motion around the sun add an appreciable frequency shift.
地球自轉與地球繞日公轉產生附加的頻移。 -
The frequency shift keying modulation is widely used in hf digital communication
移頻鍵控是短波數字通信中常用的一種調制方式。 -
Bcfsk binary code frequency shift keying
二進制編碼頻率移位鍵控法 -
Frequency shift telegraphy
移頻電報術 -
Sound system equipment. part 9 : artificial reverberation, time delay and frequency shift equipment
音響系統設備.第9部分:人工混響延時和頻移設備 -
Sound system equipment - methods for specifying and measuring the characteristics of artificial reverberation, time delay and frequency shift equipment
音響系統設備.第9部分:模擬混響滯后和頻移設備特性的規定和測量方法 -
This is because that frequency shift can also be found in the wind vortex over the arctic ocean, u - wind in beaufort sea, v - wind in east siberian sea and the pdo index
因此，除熱力因素外，動力因素引起的海冰的平流與該變頻現象也存在一定的聯系。 -
Microwave - power frequency shift in optically pumped 87rb cell frequency standard
頻標中的微波功率頻移 -
The equation including the nonlinear dispersion, i. e. the modified nonlinear schrodinger ( mnls ) equation, is a better model. in this thesis, we take mnls solitons as a model for femtosecond soltions. then based on the recently developed direct perturbation theory for perturbed mnls equation, we study the raman self - frequency shift of femtosecond solitons and its suppression by the means of frequency filters. for this purpose, first, we define the physical parameters of mnls solitons ; next, through the direct perturbation theory for perturbed mnls equation, under adiabatic approximation, we obtain the evolving parameters of mnls soliton on our questions and then choose the parameters of frequency filters based on it ; at last, we directly numerically simulated our questions by split - step fourier ( ssf ) method after improving the arithmetic of the differentiation of the nonlinear item for satisfying mnls equation
本論文以mnls孤子作為光纖飛秒孤子的模型，通過新近建立的mnls孤子直接微擾理論，研究光纖中由拉曼效應引起的飛秒孤子在傳輸中的自頻移，以及通過頻率濾波對自頻移的抑制。為此，首先給出描述mnls孤子的各物理量，然後用mnls孤子直接微擾理論，解析地得到這些問題絕熱近似下的孤子參數演化，並由此選擇頻率濾波的參數，最後用分步傅里葉方法，在對非線性項微商的演算法做出了適合於mnls孤子的改善後，對拉曼效應及頻率濾波進行了直接數值模擬，其中頻率濾波參數用微擾理論確定。 -
Our treatment shows in the raman effect case, mnls solitons, the same as nls solitons, keeps its energy, initial center and initial phase unchanged. however, the raman effect, not the same as nls solitons. reduces its amplitude, widens its width and under the same conditions, the self - frequency shift of mnls soltions is closer to the result of numerical simulation. in the raman effect together with frequency filters case, mnls solitons, the same as nls solitons, keeps initial center and initial phase unchanged and bandwidth - limited frequency filters can make the mean frequency of mnls soltion stand a steady value at the red side of the initial mean frequency, i. e. suppress the self - frequency shift of mnls soltions. and that, the other physical parameters of mnls soltion last stand a steady value. however under the same conditions, the steady value of the mean frequency of mnls soltions is closer to the initial mean frequency and the result of numerical simulation
有所不同的是， raman效應雖然不改變孤子能量，但會引起孤子峰值的下降和寬度變寬，且在同一條件下， mnls孤子微擾理論得到的自頻移比nls孤子微擾理論得到的更接近直接數值計算結果。有限帶寬的頻率濾波也不引起mnls孤子初始中心、初始位相的改變，選取適當的頻率濾波器參數值能使孤子的平均頻率穩定在初始平均頻率的紅側一穩定值，抑制了自頻移，而且孤子的各物理量最後都穩定在一穩定值，這些與nls孤子微擾理論都是類似的。有所不同的是，寬度為飛秒量級下， mnls孤子平均頻率的穩定值更接近初始平均頻率，更接近數值計算結果。 -
The key factors of the relayed frequency shift jamming to it ' s quality are it ' s frequency shift amount and the time delay between the jamming pulse and the jammed signal
決定轉發移頻脈沖干擾品質的是其移頻量和與信號脈沖的相對延遲時間。 -
The reflected light spectrum from interaction of uv laser with solid plasma was measured to investigate the frequency shift due to doppler effect of expanding critical density
測量了紫外超短脈沖激光等離子體中的光譜頻移，分析表明是有質動力和等離子體熱壓力共同作用的結果。 -
It ' s jam characters are similar to radio - frequency noise jamming. relayed frequency shift jamming has good effect on pc radar
轉發移頻脈沖干擾對于脈沖壓縮雷達是極為有效的干擾。 -
The effect of static magnetic field on the growth of eschrichia coli was discussed by the sensitive response of spqc sensor to the conductivity of solutioa a relative frequency shift response model was derived on the basis of theory analysis and the relative parameters were estimated
利用spqc傳感器對溶液電導率的靈敏響應，探討了了一定強度的靜磁場對大腸桿菌的生長狀況的影響。在理論分析的基礎上，導出了相關的頻移響應模型，估計了有關參數。 -
Finally, its frequency shift is displayed by led, which is caused by mass loading effect
最後，顯示其溫度補償後由于質量沉積效應所引起的振蕩頻率漂移量。 -
Then by the method of computer simulation, the following jamming patterns are made quantitative analysis, radio - frequency noise jamming, continuous single tune jamming, continuous noise amplitude - modulated jamming, relayed frequency shift jamming, and the key factor which affect the quality of these jamming patterns
然後在此基礎上，通過計算機模擬分析，定量地討論了射頻噪聲干擾、連續正弦波干擾、轉發移頻脈沖干擾以及影響它們干擾品質的因素，並以壓制系數為衡量標準，進行了干擾效能分析。 -
The optical sampling with frequency - shift, asynchronous optical sampling, and photonic analog to digital conversion based on time - interleave were investigated, included the theoretical analysis and experimental demonstration
建立了頻差法光脈沖取樣、異步光取樣及基於時分光取樣的光子模數轉換實驗裝置。 -
The actively and passive mode - locked fiber ring laser and two types of photonic switching, slalom ( semiconductor laser amplifier loop mirror ) and uni ( ultrafast nonlinear interferometer ) were developed. this thesis presented the principle and the requirements for the optical of frequency - shift sampling module under common conditions
研製了作為光取樣脈沖源的主動鎖模和被動鎖模光纖激光器；半導體光放大器環鏡及超高速非線性干涉儀的光子開關，並進行了頻差法光取樣、異步光取樣及基於時分光取樣的光子模數轉換的實驗研究。 -
In addition to the thermal reasons, the advection of arctic sea ice ( pacific section ), which is the result of dynamic factors, is closely related to the frequency shift that occurred in chukchi sea
楚科奇海海冰范圍的年際變化中存在由低頻向高頻變化的現象，該現象除了在局地氣溫變化中存在之外，在北冰洋區域風渦度、波弗特海緯向風、東西伯利亞海經向風等動力因素中也有所體現。
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