散射波通信 的英文怎麼說

中文拼音 [sǎnshèbōtōngxìn]
散射波通信 英文
scattering wave communication
  • 散 : 散動詞1. （由聚集而分離） break up; disperse 2. （散布） distribute; disseminate; give out 3. （排除） dispel; let out
  • 射 : Ⅰ動詞1 （用推力或彈力送出） shoot; fire 2 （液體受到壓力迅速擠出） discharge in a jet 3 （放出） ...
  • 波 : Ⅰ名詞1 （波浪） wave 2 [物理學] （振動傳播的過程） wave 3 （意外變化） an unexpected turn of even...
  • 通 : 通量詞（用於動作）
  • 散射 : [物理學] [電學] scattering; radio scattering; scatter; dispersion
  • 通信 : communication; communicate by letter; correspond
  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. Polarimetric synthetic aperture radar ( polsar ) investigates the transverse vectorial nature of plane em waves and provides the complex scattering matrix of a scatterer. scattering polarimetry is sensitive to the shape, orientation, and dielectric properties of scatters

    極化合成孔徑雷達（ polsar ）研究電磁波的矢量特徵，通過測量和分析目標的極化散射特性，獲取目標的介電常數、物理特性、幾何形狀和取向等方面的大量信息。
  3. In recent years, the worldwide researchers pay much attention to fourier telescopy. it is an active imaging technique that encodes the information in the temporal instead of spatial domain, then receives the speckle and deposed of it to reconstruction the object image. now, the high - resolution technique is under the condition of deeply researched

    它是一種主動式干涉成像技術，這一技術通過時域內的相位的調制完成直線條紋對目標的掃描，從而達到對深空目標頻譜的抽樣，然後接收其散射回波，對回波信號進行處理，進而還原出目標的像。
  4. Based on mono - pulse radar system and the analysis of terrain echoes, a geometrical model of air to ground ranging is constituted. by using the signals received from the sum and difference channels of terrain follow radar, a group of the expressions for terrain echoes are educed and characteristics of these echoes are obtained. according to the characteristics of the echoes, the theory and method of pass zero detection of difference channel and its applications are discussed in detail

    針對一維單脈沖雷達體制，分析了地形目標回波特性；建立了地形跟隨雷達空地測距的幾何關系；利用雷達收發信號，導出了地形跟隨雷達和差接收通道的回波信號表達式，進行了波形模擬，得到了地形跟隨雷達的地面散射產生回波在時域中的特性；根據和差回波特性，闡述了差信號過零點檢測測距的原理和方法及工程實踐中的應用，並給出了真實雷達對外輻射試驗的結果，驗證了文中的模擬。
  5. Ccd ), light signals from the object is covered by relay scattering when laser beam penetrates through the atmosphere. so the technique of range gate has been used in such system

    當激光通過大氣時，瑞利散射將使得ccd器件接收到的目標回波信號淹沒在噪聲信號之中，因此系統中採用了距離選通技術。
  6. The conclusions are as follows : the ultrasonic intensity is proportion to the laser intensity ; the ultrasonic induced by a laser line source has much more advantages than by a laser point source, such as stronger energy, higher snr, more directivity and shape ; the intensity of cfpi ' s output signal is linear with ultrasonic vibration velocity, and is effected by incidence angle and scattered angle ; snr will increase by reducing cfpi ' s bandwidth, reducing incidence angle, increasing cavity ' s length and reflectivity

    在分析點光源激勵聲表面波機理的基礎上，求出了線光源激勵的超聲振動的位移表達式，發現線光源激勵的近場區表面波具有波形好，信噪比高，指向性好，幅度強等特點。通過理論推導，得出共焦fabry - perot干涉儀的輸出光強除了與樣品表面的振動速度成正比，並與入射角和散射角有關；適當減小cfpi的帶寬，增加腔長，增大鏡面反射率，或者減小檢測入射角都可以提高系統的信噪比。
  7. In specific, the formulation of the rcwa for 2 - d and 3 - d metallic gratings and the formulation of the fdtd method for dispersive media are presented. a novel hybrid diffraction method, which is based on the kirchhoff - huygens diffraction formula and the rcwa, is proposed to simulate the working of a planar integrated diffraction grating

    針對在光通信以及光盤存儲領域的具體應用，著重對二維及三維金屬光柵衍射問題的嚴格耦合波分析以及色散媒質散射問題的時域有限差分方法進行了公式推導。
  8. Through analyzing the principle of millimeter wave radiometer, the paper sets up the theory module of millimeter wave radiometer ' s output signal, measures the 3mm and 8mm band targets " radiation and scattering characteristic

    通過分析毫米波段輻射計的工作原理，建立毫米波輻射計輸出信號的理論模型。對3毫米、 8毫米波段目標輻射特性和散射特性進行測試，並對測試方法的可行性進行分析。
  9. The millimeter has the largest frequency band and the highest velocity of communication, but it has the highest cost and technical defaults : multi - path effect, reflect and scatter caused by cloud, smoke, water - dropping, the buildings, the grounds and its shape, the interference caus ed by the thunder, the complexity of device, difficult maintenance, and so on. now the band of the leakage coaxial line is up to 3ghz, leakage coaxial line has some advantages : good adaptability to cloud, smoke, water - dropping, the buildings, the grounds and its shapes, good steady field, it has some technical defaults : lower resolution for location and measuring velocity, the more complex of its sending - receiving relay devices, weak anti - interference, the strict demand for the hole size in the line, the cleaner work environment and the higher cost

    毫米波具有最大的帶寬和最高的通信速率，但也有最高的成本要求和較難克服的技術問題，即傳播的多徑效應，降水、雲霧、地形、地貌、建築物等的反射散射，打雷時的嚴重干擾，設備復雜，維護困難等等；泄漏同軸電纜的帶寬目前已做到3ghz ，具有對地形地貌建築物的適應性強，場強穩定，但它的定位測速精度低，它的收發中繼設備較復雜，抗干擾能力低，電纜上的開槽有著嚴格的尺寸要求，工作環境要求清潔，成本較高；傳統無線感應技術具有結構簡單，成本低廉，維護方便，定位精度較高的優點，但是，它沒有抗干擾能力。
  10. Some valuable conclusions are summarized by theoretical analysis and simulation experiments : from the side of signal processing, pulse jamming can be deleted by the method of time - domain sliding window accumulation and can be restored by interpolative prediction. ; gauss white nose can be attenuated while jamming disperse point - target by the method of time - frequency analysis in time - frequency domain. ; radio frequency noise jamming can be deleted by the method of average range frequency spectrum and notching in frequency domain

    通過大量的理論分析和模擬實驗，得到了一批具有一定價值的結論：從信號處理的角度出發，對于脈沖式干擾，能夠運用時域滑動窗口積累的方法去掉，並且通過預測插值得到較好的恢復；對于高斯白噪聲干擾，在時頻變換域內應用時頻分析方法可減小其對分散點目標的干擾；對于射頻噪聲，通過平均距離頻頻法和頻域陷波的方法可以去掉；從改變合成孔徑雷達系統角度出發，類似雙基地雷達能夠避免各種干擾，對發射信號進行調幅，調相以及改變調頻斜率都是較好的抗干擾方法。
  11. A coherent electromagnetic pulse in the range between the far - infrared and microwave region is used as a detection source. the amplitude of the wave is recorded by electro - optical or photoconductive sampling. after fast fourier transform, the amplitude and phase of the wave is given, then the complex refractive index standing for the absorption and dispersion of the material in thz region is extracted

    Thz （ 10 ~ （ 12 ） hz ）時域光譜技術是20世紀90年代發展起來的一種新型的光譜測量技術，它使用頻率介於遠紅外和微波之間的相干電磁輻射脈沖作為探測源，利用電光取樣或光電導取樣的方法直接記錄thz輻射電場的振幅時間波形，通過傅立葉變換得到測量信號振幅和相位的光譜分佈，進而獲得材料在thz波段的復介電常數，即色散及吸收等信息。
  12. On the other hand, a new technology using tunable laser as light source of delay system is proposed, which uses the characteristics of optical fiber material dispersion which means that the refraction index of optical fiber changes along with the difference of transmitting wavelength

    另一方面，提出一種通過採用可調諧激光器作為系統光源的技術，利用光纖的材料色散特性即光纖的折射率隨傳輸波長變化而改變的特點，來改變延時光纖中信號存儲的時間，從而達到提高光纖延遲線延時精度的目的。
  13. A modified real signal model of channelized transmitter is presented that employs multiphase filters and discrete fourier transform to maximize computing efficiency, which can mean much in a radio communication system that requires real - time processing

    特別提出了改進的實信號通道化發射機數學模型，通過利用多相濾波與離散傅立葉變換，減少信號處理運算量，這對于強調實時運行的無線通信系統有重要意義。
  14. As a result, the peak power, pulse width and time delay of the output pulse have been investigated in detail, including the chirp of the input pulse and the linear dispersion of the filter, and some new and important conclusions have been obtained for the first time

    並分析了濾波器的線性色散和入射脈沖的啁啾大小對輸出脈沖的影響，對實際的光通信系統中器件參量的設計具有一定的指導意義。利用耦合模理論，對幾種典型的光纖光柵進行了研究。
  15. In the first place, start with theoretic model of distributed fbg strain - sensing network, sensing principle of fiber bragg grating is analyzed and sensing model created. on the basis of analyzing advantages and disadvantages of several familiar multiplexing and demodulation techniques, a mixture multiplexing method that combines optical frequency domain reflectometry ( ofdr ) and wavelength division multiplexing ( wdm ) is proposed to address fbg sensing array. at the same time, tunable narrow - band light source, which is composed of wide - band light source and tunable optical filter, is adopted to demodulate multiplex signals

    首先，論文從分散式光纖光柵應變傳感網路的理論模型入手，分析了光纖布拉格光柵的傳感機理，建立光纖光柵應變傳感模型；在分析比較了常見幾種復用技術和信號解調技術的優缺點基礎上，提出應用光頻域反射復用技術和波分復用技術相結合的混合復用方法來解決光纖光柵應變傳感網路的尋址問題，採用由寬帶光源和可調諧光濾波器組成的可調諧窄帶光源來解調復用信號，通過理論分析和實驗研究證實了系統方案的可行性。
  16. This paper studies target detection algorithms using polarimetric one - dimension range profile. at first by exploiting polarimetric information in different polarization channels, a fused and enhanced one - dimension range profile is obtained by pwf. then we can detect radar target through integration of scatters in different resolution cells or the number of detected scattering points

    首先利用不同極化通道的相關性信息，將各個極化通道的一維距離像通過極化白化濾波（ pwf ） ，抑制相關雜波，提高信雜比，融合得到一幅改善了的一維距離像，然後通過多個散射中心的能量徑向積累判定目標的有無。
  17. Then, after the structure and characteristic of awg is described in brief, we put emphasis on the deduce of the dispersion equation of ufbgs in the vicinity of its reflection band gap ( rbg ) in light of coupling theory. in terms of this equation, the dispersion compensation of the optical signal in every channel in the wdm system, which has eight channels, is calculated and analyzed theoretically. during the course, some important parameters of ufbgs in the compensator are computed

    在簡要敘述了陣列波導光柵的結構及其特性后，著重從光纖光柵耦合波理論導出了均勻光纖光柵在反射帶隙（ rbg ）外附近的色散特性方程，並根據這一特性方程，對8通路的wdm系統中各分亡巴八碩士學位論文tinv坯1 ： e 』 sthe狠波光信號的色散補償進行了數值計算與分析，由此確定補償器中各均勻光纖光柵的相關參數。
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