backscatter radar 中文意思是什麼

backscatter radar 解釋
後向散射雷達
  • backscatter : 背反射
  • radar : n 〈美國〉【無線電】 〈radio detecting and ranging 之略〉 雷達，無線電探測器 （＝〈英國〉 radiolo...
  1. The ionosphere is a complex medium, which is aeolotropy, asymmetry, dispersive and changes randomly with time. in order to improve the communication quality of the shortwave that depends on the ionosphere, we should have aknowledge of the current condition of the ionosphere in real time. the backscatter sounding of high frequency can diagnose the real - time channel characters for shortwave communication or hf radar, which is great assistant to shortwave communication and hf radar

    電離層是隨機時變，各向異性，非均勻、色散的復雜介質。為了保證依賴于電離層進行的短波通信質量，必須了解電離層的實時狀態信息。高頻返回散射探測可以實時監測與短波通信或高頻天波雷達相關的天波傳播通道的狀態，對短波通信和天波雷達工作起了重要的輔助作用。
  2. Hall, c. 1988 : fist observations of summer polar mesospheric backscatter with a 224 mhz radar, geophys. res. lett., 15, 18 - 31

    採用224兆赫雷達首次測得的夏季極地中間層大氣的後向散射。 「地球物理研究通訊」 ，第15卷28 - 31頁。
  3. Main conclusions drawn from the analyses of calculating results are as follows : ( 1 ) the microwave absorption of atmosphere gas have obvious attenuation at the wavelengths for cloud detection, thereinto, the water attenuation effect changes greatly, so the 94ghz cloud detecting radar should have water vapor attenuation correction scheme. ( 2 ) when 37ghz and 94ghz radars detect clouds, the difference between the atmosphere and cloud attenuation and the large variety of radar reflectivity conduce the intension of the radar backscatter signals change. ( 3 ) for the thin cloud layer and low water content of cloud, 37 - ghz radar backscatter signals are not as good as 94 - ghz radar, that is to say that the 94ghz radar has better capability in thin clouds detection

    本工作得出如下結論： （ 1 ）大氣氣體的微波吸收在測雲波段產生明顯的衰減，其中水汽衰減效應變化很大；即將上天的空間94ghz測雲雷達必須有水汽衰減訂正方案； （ 2 ） 37ghz和94ghz雷達測雲，由於大氣和雲衰減不同和雷達反射率的很大差異，導致雷達回波信號強弱不同； （ 3 ）對雲層較薄、含水量較少的雲，在不計雷達參數的情況下， 37ghz雷達回波信號不如94ghz測雲雷達，也就是說94ghz對薄雲有更強的探測能力；對雲層較厚、含水量大的雲，由於強衰減的作用， 94ghz雷達回波信號小於37ghz雷達； （ 4 ）從大氣衰減的不利因素方面考慮，空間94ghz雷達測高層薄雲的效果最好；測低層薄雲時需要考慮氣體衰減訂正；因濃厚雲的強衰減作用，探測其中下部的能力大大減弱，不僅要進行衰減訂正，而且要藉助其他信息來反演整個雲層的含水量垂直分佈； （ 5 ）為了獲得從極薄到極濃厚雲的垂直分佈探測能力，未來測雲雷達系統最好採用雙波長甚至三波長（如94 、 37和13ghz ） 。
  4. Then according to the radar equation, on the base of the platform of ray tracing, builds a simulation platform of backscatter ionogram

    然後根據雷達方程計算返回散射能量，在射線軌跡平臺的基礎上，建立了返回散射電離圖模擬平臺。
  5. Owing to the anisotropic and the biharmonic nature of microwave radar backscatter on spaceborne scatterometer, and to the scatter model function nolinear and the existence of various noise sources in the measurements in addition to the model function, the retrieval wind results consist of as many as four wind directions

    由於衛星散射計探視雷達回波的各向異性的雙調和性質，同時由於散射物理模型函數的非線性及信號中存在噪聲，使得常規點方式風場反演中風向有多至4個解的多解存在。
  6. There is an urgent need for the polarimetric synthetic aperture radar ( sar ) data to be calibrated, so that the quantitative relationships between radar backscatter and geophysical parameters can be properly established, along with the development of international polarimetric sar technology and more and more in - depth study and application of polarimetric sar data. up to now a lot of polarimetric sar calibration methods have been developed. some of them have been used in several applied sar systems and the calibration results are satisfying

    隨著國際上多極化合成孔徑雷達技術的發展以及雷達圖像應用的門益廣泛和深入，定量化應用的要求逐漸變得迫切，因而極化定標技術得到了廣泛深入的研究，並且涌現了大量的各有特色的演算法，有些也已經投入具體系統的實際應用中並獲得了令人滿意的結果。
分享友人
分享到 Line

分享到臉書