蓋雷達 的英文怎麼說
中文拼音 [gěléidá]
蓋雷達
英文
guereda-
Applying the radar technology to estimate relative change of soil moisture in vegetated area
應用極化雷達估算農作物覆蓋地區土壤水分相對變化Othr ( over - the - horizon radar ) is a kind of hf ( high frequency ) radar with great expectation, which has arisen great concern worldwide because of its large coverage, anti - stealth character and so on
超視距雷達( othr )是一種具有較大發展前景的高頻雷達,以其覆蓋距離遠、覆蓋面積大和抗隱身等優良特點受到各國學者的廣泛關注。In addition, airway winds, which are essentially grid - point wind and temperature data over the south china sea for 15 flight levels between 10, 000 and 43, 000 ft, are disseminated to the radar data processing and display system ( rdpds ) of the cad for calculation of the expected arrival time of aircraft at check points
除此之外,氣象數據處理系統將飛機航道風的數據傳送至民航處的雷達數據處理及顯示系統,這些數據是風和溫度的網格點值,其水平范圍覆蓋南海,垂直范圍是由10 , 000至43 , 000尺之間的15個飛行高度;以上資料可用來計算航機抵達各定位點的時間。In addition, airway winds, which are essentially grid - point wind and temperature data over the south china sea for 15 flight levels between 10, 000 and 43, 000 ft, are disseminated to the radar data processing and display system rdpds of the cad for calculation of the expected arrival time of aircraft at check points
除此之外,氣象數據處理系統將飛機航道風的數據傳送至民航處的雷達數據處理及顯示系統,這些數據是風和溫度的網格點值,其水平范圍覆蓋南海,垂直范圍是由10 , 000至43 , 000尺之間的15個飛行高度以上資料可用來計算航機抵達各定位點的時間。Radar equipped in an airplane has many merits such as seeing things beyond the visibility of ground - based radar, flexibility in application. it plays an important part and is widely used in national defence
機載雷達由於架設在運動的高空平臺上,具有探測距離遠、覆蓋范圍大、機動靈活等特點,應用范圍相當廣泛,可以執行戰場偵察、預警等任務。For parameter a, there is a close relationship exist between a ( 9, sr ) in two different radar incident angle that can be expressed as : with considering the effects of soil texture, we get the final expression of the inversion model : where mv ( t1 ), mv ( t2 ) is volumetric soil moisture content in two different temp, c, d is soil type related parameters, and v ( t1 ), s ( t2 ) is coresponding bare soil radar backscattering coefficients. inversion results show that for the c band hh polarized radarsat scansar data with a range of incidence angle from 20 to 40, the soil moisture change value can be derived with an acceptable accuracy using the above model. the temporal and spatial soil moisture change patterns are associated with rainfall and vegetation cover, as well as the soil hydraulic characteristics
利用最新發展的電磁波散射模型研究了不同植被覆蓋地表雷達波對地表土壤水分的敏感性,建立了半經驗植被雷達後向散射模型; 2 ) .研究發現在農作物等矮小植被覆蓋地表,植被層直接後向散射與植被類型相關,且在植被生長期,雷達後向散射系數對植被含水量的敏感性要高於對植被高度變化的敏感性; 3 ) .解決了單參數雷達地表土壤水分反演問題中,雷達入射角和地表粗糙度的影響這一難點問題; 4 ) .利用土壤介電模型校正了不同土壤類型對反演地表土壤體積含水量的影響; 5 ) .在以上成果基礎上,建立了完整的單參數雷達地表土壤水分變化探測反演演算法,經地表驗證,模型反演地表土壤水分變化值的精度為rmse = 0To enhance surveillance of air traffic at low altitude airspace not adequately covered by radar
為加強監察雷達未能全面覆蓋的低高度空域的空中交通1套A primary surveillance radar detects and provides both range and bearing information of an aircraft within its effective coverage
一次監察雷達能探測覆蓋范圍以內之飛機距離及方向資料。This technique is mainly involved two steps : 1 ) vegetation effects correction : we used ndvi ( normalized difference vegetation index ) derived from tm and avhrr measurements for spatial and temporal variations of vegetation covers at different scales
但由於電磁波與地表相互作用的復雜性,雷達後向散射系數除受地表介電常數(土壤水分)影響外,還受到地表粗糙度、土壤類型、植被覆蓋以及雷達入射角、頻率、極化等多種因素的影響。Using a simple radiative transfer model for vegetation volume scattering and the integral equation model ( ibm ) for surface scattering with the field in situ measurements as the input, we compared the simulated and sar measured backscattering coefficients in different agricultural fields
特別是在植被覆蓋地表,對其下土壤水分的監測更帶有極大的困難性。因此,利用雷達後向散射系數反演土壤水分必須首先充分理解微波與地表的相互作用過程。2 ) radar incidence angle and surface roughness correction : to make radar incidence correction and eliminate the surface roughness effects, a wide range of surface parameters ( soil moisture, surface rms height, correlation length, incidence angle ) was input to the ibm model to simulate the effect of surface roughness and radar incidence angle on the sensitivity of soil moisture to the radar backscattering coefficient. a simple model was established to simulate the effects of incidence angle and surface roughness. 3 ) establishment of soil moisture change inversion model : according to a modified ibm model simulation results, the bare surface backscattering coefficients can be expressed as a funtion of the dielectric component for a given surface roughness when the surface slope greater than 2. 0, which is valid for most nature surface : in above equation, r0 is the surface reflectivity at normal incidence
本研究中,首先利用基於微波輻射傳輸方程的微波植被模型和積分方程( iem )模型模擬了各種地表土壤水分含量情況下,植被覆蓋、地表粗糙度(包括地表均方根高度和相關長度) 、雷達入射角對c波段(頻率4 . 7ghz )水平極化( hh )雷達後向散射系數的影響,在此基礎上,建立模型消除了植被覆蓋、地表粗糙度、及雷達入射角對雷達後向散射的影響,利用多時相50m解析度radarsatscansar雷達後向散射系數圖像反演得到了地表土壤水分變化模式信息。The system is designed to search, track, process and display ssr equipped aircraft within an airspace of 32 nautical miles in range and 15, 000 feet in elevation
這套系統可搜尋、追蹤、處理和展示裝有二次監察雷達應答器的飛機及其飛行資料,覆蓋范圍達3 2海里,覆蓋高度則達1 5 0 0 0英尺。Can the radar set cover the whole area
雷達裝置能覆蓋整個地區嗎?Radar does not cover the vast airspace, so pilots must radio in at predetermined points along strict flight paths, allowing controllers to calculate separation between planes, which must be at least 100 miles
雷達覆蓋不了廣大的空域,因此駕駛員必須沿著嚴格限制的路徑飛行,在特定航點發出無線電,讓管制員可以計算飛機之間的距離(兩架飛機至少必須間隔160公里) 。During this paper, definition of the measure enter - cover - probability is given, andthree - dimension detection space are transformed to level detection circles on differentheights. aiming at the most normal situation of symmetric line, cross - to line and cross - awayline taken by the carrier, probablely - enter - cover - target - distribution are analysed in relativemovement method on the premise that targets fly perpendicular to the flying direction of thecarrier. mont - cario method is used to simulate uniformly - distributed - targets situation and getthe measure, and results are used to analyse the influence of line - landscape - orientation - ratio, line - portrait - ratio, and speed - ratio on the measure. for further research, influences of height and blind space are also discussed on base ofradar level detection range, and situations of non - uniformly - distributed targets are alsoresearched
為了分析主動探測空間動態性能,本文首先提出以「目標進入雷達覆蓋區概率」 (簡稱為「覆蓋率」 )作為評價指標;然後將三維探測空間轉換為不同高度層對應的水平探測圓,針對載機採用雙平行航線、交叉相向航線和交叉同向航線的最一般情形,採用相對運動的方法,分析目標垂直入侵時可能進入雷達覆蓋區的目標分佈情況;再運用蒙特卡洛法進行模擬計算,分析並比較目標服從均勻分佈時航線橫比、航線縱比及速度比對性能的影響。Energy distribution involves many radar ' s parameters, such as peak power of transmitter, maximum pulse width, antenna gain, rotating speed of antenna, beam width, covering range of elevation, maximum height and range and so on
能量分配牽涉到雷達系統的各種重要參數如發射機峰值功率、最大發射脈寬、天線增益、天線轉速、波束寬度、仰角覆蓋范圍、最大高度覆蓋、最大作用距離等。A polarimetric sar combines both advantage of measuring full complex scattering matrix for each resolution cell in a scene and producing two - dimensional high resolution images, and is thus playing a more and more important role in gathering the detailed information regarding the geometric and electric structures of surfaces and covers for application in both civil and military areas
極化合成孔徑雷達( sar )具有可以測量場景中每個分辨單元的全極化散射矩陣以及產生二維高分辨力圖像的兩大優點,因此無論在民用和軍用的採集地表或地面覆蓋物的物理和電磁結構信息的應用中起著越來越重要的作用。Wireless communication receiver applies widely in so many areas such as wireless communication, television, broadcast, radar, satellite communications and so on
無線通信接收機覆蓋了無線電通信、電視廣播、無線電廣播、雷達定位、遙測遙控、衛星通信以及移動通信系統等各個領域。The following figures show the + / - 120 - degree coverage of the radar scan relative to your nose. the radar beam sweeps back and forth from your 8 o ' clock to your 4 o ' clock position
下圖標明了雷達在機頭+ / - 120度掃描的覆蓋范圍。雷達波束在8點和4點之間來回掃描。Standard test method for evaluating asphalt - covered concrete bridge decks using ground penetrating radar
使用地面穿透雷達評價瀝青覆蓋混凝土船橋甲板的標準試驗方法分享友人