散射頻帶 的英文怎麼說
中文拼音 [sǎnshèbīndài]
散射頻帶
英文
scatter band-
The investigation is very useful not only in further studying the electromagnetic scattering characteristics of complicated large objects over the whole frequency band, but also in improving and designing the wide - band radar, ultra wide - band radar and new wide - band radar absorbing material
本文的研究，為今後進一步開展復雜電大目標全頻段電磁散射特性的研究提奠定了基礎，為寬帶雷達和超寬帶雷達的設計與開發，新型寬頻帶隱身材料的研究提供理論指導。In chapter 3, under the wideband radar system, some parameter estimation methods of scattering center are studied in the white noise and clutter background
第三章以寬帶階梯變頻雷達為研究背景，在白噪聲和雜波條件下，研究了提取目標強散射中心的參數估計方法。A new terahertz source of folded waveguide traveling - wave - tube which based on vacuum electronics is introduced, which may answer the question for scarcity of small, economical terahertz source with continuous wave of high average power. secondly, transmission characteristics of terahertz wave in the periodic slow wave circuit of folded waveguide traveling - wave - tube have been researched combined with development of micro - fabrication technology. dispersion relation and interaction impedance of the slow wave circuit are deduced by the way of equivalent circuit, and results accounted by theory are close to those simulated by software
其次，結合計算機模擬技術對這種新型太赫茲輻射源的折疊波導慢波線路傳輸特性進行研究:用等效電路法從理論上推導了慢波電路場、色散關系及線路耦合阻抗，電磁模擬軟體計算得出的慢波電路色散曲線與理論計算所得結果基本上一致，表明這種尺寸的慢波電路在太赫茲頻段有著色散曲線較平坦以及寬帶、低損耗的良好傳輸特性。Firstly, based on the geometric relationship of sar system, the low frequency, uwb and wide - angle electromagnetic scattering models of calibrators are achieved, using the moment method and the asymptotic waveform evaluation technique
首先採用矩量法和漸近波形估計技術，結合sar幾何關系，獲得定標體的低頻，超寬帶和寬角度電磁散射模型。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。Then this dissertation investigates the methods of radar target recognition based on one dimensional range profiles and one dimensional scattering centers which are obtained from target wideband frequency responses
然後研究了利用由目標寬帶頻率響應得到的一維距離像和一維散射中心進行目標識別的方法。Present phs standard prescribed a rather loose out - band and emission power requirements, which will cause severe interference to adjacent frequency band. the wcdma standard requires a more strict rf performance at the account of already existed systems
Phs系統對帶外和雜散指標定得比較寬松，而wcdma的協議標準里專門考慮了對現有系統的干擾情況，因而對射頻指標要求得比較嚴格。In chapter 4, firstly, the two - dimension scattering model of target under high resolution radar system is developed, the two dimension resolution rates are reviewed and coordinate transformation of data are discussed
第四章在寬帶體制下，推導了目標多散射中心的二維頻域散射數學模型，分析了目標二維結構成像的兩維分辨力和測量數據的坐標變換。The tested results show that the designed c - band fmcw frequency source meets the waveform requirements, and its output power is more than 20dbm. however, the spur level was too high in the bandwidth
實驗表明所設計的c波段fmcw頻率源達到波形參數要求，發射功率達到20dbm ，但帶內雜散抑制不理想。More information of objects can be obtained from developing the wide - band radar and ultra wide - band radar. with the frequency increasing and the wavelength decreasing, the original objects become electrically large objects. so it is important to study the wide - band electromagnetic scattering characteristics of electrically large objects
發展寬帶雷達和超寬帶雷達可以獲得目標更多、更豐富的信息，而隨著雷達頻率的提高，工作波長的縮小，被研究的雷達目標成為電大尺寸目標，所以研究電大目標寬帶電磁散射特性具有十分重要的意義。分享友人