doppler profile 中文意思是什麼
doppler profile
解釋
多普勒輪廓-
Low tropospheric wind profile from a 1. 06 m doppler lidar
多普勒激光雷達的低對流層風場測量 -
In chapter 3, we studied the effect of gaussian transverse profile for the driving and laser fields on lasing without population inversion ( lwi ) in a closed v - type system and an open v - type system. moreover, we discussed also the effect of the unsaturated gain coefficient, the cavity - damping rate, the ratio of the atomic injection rates and atomic exit rate on the corresponding systems. in chapter 4, we mainly discussed the effect of doppler broadening on the gain, dispersion and the frequency up - conversion of the open v - type lwi system and compared the differences and the same between the open system and the corresponding closed system
發現： （ 1 ）在考慮doppler展寬的情況下，通過選取合適的實驗室條件（比如合適的原子環境溫度等）可得到合適doppler展寬值，從而使系統獲得最佳增益； （ 2 ）要想實現系統的頻率上轉換，同時又要獲得足夠強的無反轉激光增益，則系統頻率轉換比不能選取的太大； （ 3 ）對于開放系統，比較小的粒子注入速率比與退出速率對產生無反轉激光是有利碩士學位論文摘要的： （ 4 ）由於dopp1oy展寬的存在，當探測場與驅動場的傳播方向相反時，增益在探測場失諧的某一段區域產生振蕩，且振蕩的振幅、頻率失諧范圍的大小與dopper展寬的取值有關。 -
A three - dimensional - acoustic doppler velocimeter is used to measure the velocity components of the flow field in all three coordinate directions for different discharge and measurement site. the influence of measurement site and the depth / vegetation height ratio on the measured velocity profile and turbulence intensity and the renolds stress is analyzed. the characteristics of the measured velocity distributions and the results of the previous investigators are used to select an analytical expression for the shape of the velocity profile
利用三維超聲波多普勒流速儀（ adv ）量測不同位置、不同流量下的瞬時流場。分析了測點位置和水深與植被高度比對時均流速分佈的影響。本文還給出了種樹段紊動強度及雷諾應力的垂線分佈。 -
Based on the work of the former people, in this paper, we mainly studied the effect of the driving field phase fluctuation, the effect of gaussian transverse profile of the driving and laser fields, the doppler effect and so on for the open v - type lwi system
本文在前人工作的基礎上主要討論了開放的v型三能級系統中驅動場的相位漲落、驅動場與激光場的橫向效應以及doppler展寬對產生無反轉激光的影響，並討論了系統其他各種參數的作用。 -
Space - time block codes ( stbc ) based on orthogonal design has attracts enough attentions in its applications in mimo - ofdm systems for its full diversity exploiting and low coding / decoding complexity. these applications include not only system performance improvement, but also reduction of the peak to average power ratio in mimo - ofdm systems. under these backgrounds, this paper first studies space - time block codes under the single carrier, flat fading situation, discusses the encoding / decoding principle and its performance under different channels. then, the author focused on the performance of space - time codes under time selective and frequency selective channels, uncovered the fundamental cause of how maximum doppler shift and power delay profile influences the performance of space - time codes through deduction and simulation
在上述背景下，本文以單載波，平坦衰落通道下的空時分組碼為切入點，深入分析了其編譯碼原理和在不同通道情況下的性能;以此為基礎，後文展開了對空時分組碼在多載波，時間選擇性和頻率選擇性衰落通道下的性能研究，通過理論推導和充分的模擬，揭示了空時/頻分組碼在時頻選擇性衰落通道中的性能變化的根本原因;在以上對多載波系統中空時分組碼的研究的過程中，作者發現了空時分組碼在降低系統峰平比方面應用的可行性，提出了一種降低峰平比的新方法。 -
Abstract : in this paper, the fundamentals and method of longitudinal displace mentmeasarement utilizing laser doppler effect are introduced. the factors influencing the affecting accuracy are expounded. moreover, the theory analysis and experiment - based methods are offered to improve the accuracy. this study can be applied in analyzing the surface profile and distortion, which is very important in theory and practice for the fields of aviation, mechanical and architecture industries
文摘:介紹了激光多普勒縱向位移測量的基本原理和方法，闡述了影響測量精度的要素，並在理論分析和實驗的基礎上，提出了改進措施.該項研究可應用於分析物體表面輪廓和變形狀況，對航空、機械、建築等工業有重要的理論意義和實用價值 -
In this paper, the fundamentals and method of longitudinal displace mentmeasarement utilizing laser doppler effect are introduced. the factors influencing the affecting accuracy are expounded. moreover, the theory analysis and experiment - based methods are offered to improve the accuracy. this study can be applied in analyzing the surface profile and distortion, which is very important in theory and practice for the fields of aviation, mechanical and architecture industries
介紹了激光多普勒縱向位移測量的基本原理和方法，闡述了影響測量精度的要素，並在理論分析和實驗的基礎上，提出了改進措施.該項研究可應用於分析物體表面輪廓和變形狀況，對航空、機械、建築等工業有重要的理論意義和實用價值
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