low-altitude range 中文意思是什麼
low-altitude range
解釋
低空航程-
In recent years, ccd camera applies to close range photogrammetry and low altitude photogrammetry progressively
近年來， ccd相機逐步應用於近景攝影測量、低空攝影測量。 -
The landscape of our resort had a wide range of altitude from high to low ; to ensure your safety, please do not go over the fences as to avoid accidents
4本園區地形高低起伏大，為了維護您的安全，設有護欄處禁止跨越，以防意外事故發生。 -
Through the analysis of the test data and the new development in the relevant literature, some more realistic models for sea - clutter and multipath propagation is concluded and the simulation is accomplished in the software. they provide the foundation for low - altitude radar target detection & tracking techniques research. in the second part, radar low - altitude target detection & parameters ( elevation - azimuth - range delay - doppler shift ) measure are studied
（海）雜波和目標信號的多徑傳播嚴重影響了雷達低空目標探測與跟蹤的性能，通過分析國內外的有關試驗數據和最新的研究進展，總結出比較接近實際的海雜波和多徑傳播模型，並在有關軟體中實現了海雜波與多徑傳播的模擬，為進一步研究各種低空目標探測與跟蹤測量演算法提供了保證。 -
The uav ( unmanned air vehicle ) is playing an more and more important role in modern wars. it is featured by long endurance, large cruise range, heavy overload capability as well as attitude alteration limitless and casualty avoid when flying in hostile territory compared to manned air vehicle. compared to satellites it has low altitude, controllable movement, convenient arrangement and low cost
無人機在現代戰爭中扮演著越來越重要的角色，與有人駕駛飛機相比，無人機機動性能好，過載能力強，不存在飛行員傷亡；與偵察衛星相比，無人機飛行高度低，活動范圍可控，部署方便，造價低廉，目前各國都在積極研製各種新型無人機。 -
On the other hand, we give the condition of correctly solving range ambiguity and performance calculating formula of for stagger frequency difference ; condition of constraint for deciding stagger parameter value ; range " s analysis result for targets with multiple scattering centers or low altitude. this part includes chapter 2, 3, 4, 5
另外，我們還給出了參差比相測距正確解模糊的條件以及參差測距下的性能公式；提出了決定參差參數取值的約束條件；給出了多散射中心目標和低空目標的多頻連續波測距性能的結論。 -
Sponsored by dmc - radar applied in a navy range, this dissertation focus on the low - altitude / low - angle radar target detection & tracking techniques. it contains four parts : in the first part, the models of sea - clutter and multipath propagation are studied, which affect the radar ' s detectability and tracking ability of low - altitude target seriously
結合海軍某靶場dmc相控陣雷達的研製，著重研究了海面上低空目標雷達探測和跟蹤測量的有關技術，論文分為四個部分：第一部分系統分析了海雜波與多徑傳播的建模與模擬問題。 -
Several topics on coding and modulation theories of uav communication were discussed in this thesis. by analyzing features of uav communication, difference on three aspect between uav and satellite / civil mobile communication were pointed out, i. e. rapidity of the channel state parameters changing when low - altitude flying, wide range of the signal to noise ratio ( snr ) in receiver, and demand on transmission delay
無人機通信與衛星通信、移動通信有相似之處，也有明顯不同，主要是：無人機低空飛行時通道參數變化劇烈，通信中接收機信噪比變化范圍大，要求傳輸時延短。 -
Spy vessel lure them down to low altitude. then they ' ll be in range of our anti - aircraft weapons
把他們引誘到低空來。那樣就會在我們防空炮火射程之內了。
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