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        radar
        相關語句
          雷達
             Radar Target Recognition Using High Resolution Range Profiles
             基于高分辨距離像的雷達目標識別
        短句來源
             Study on Prediction Techniques of Radar Cross Section of Complex Targets
             復雜目標雷達截面計算方法研究
        短句來源
             Study of Reduced-Rank STAP for Airborne Phased Array Radar
             機載相控陣雷達降維STAP研究
        短句來源
             Research and Application of Parallel Processing Technology in Radar Signal Processing
             并行處理技術在雷達信號處理中的應用研究
        短句來源
             Radar Three Dimensional Imaging Techniques of Targets
             雷達目標三維成像技術研究
        短句來源
        更多       
          雷達的
             Intelligent Transport System--Research on Millimeter Wave Radar for Automotive Anti-collision Technique and Experiment
             智能運輸系統——基于毫米波雷達的車輛防撞技術與實驗研究
        短句來源
             Design and Production of Millimeter-wave Automotive Radar for Collision Avoidance Application
             毫米波汽車防撞雷達的設計與實現
        短句來源
             The Parameter Selection of LFM Pulse Compression Radar Realized in FFT
             FFT實現LFM脈沖壓縮雷達的參數選擇
        短句來源
             A Target Signal and Clutter Simulator of MTD Radar
             動目標檢測雷達的目標、雜波模擬器
        短句來源
             THE JAMMING PROBABILITY FOR JAMMING FREQUENCY AGILE RADAR
             對頻率捷變雷達的干擾概率
        短句來源
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          “radar”譯為未確定詞的雙語例句
             Study of the Inverse Synthetic Aperture Radar Imaging to Maneuvering Targets
             機動目標的逆合成孔徑雷達成像研究
        短句來源
             Experimental Study of Inverse Synthetic Aperture Radar Imaging Method
             逆合成孔徑雷達成像方法的實驗研究
        短句來源
             Planar Phased Array Adaptive Digital Beamforming System for CW Radar
             平面陣連續波雷達自適應數字波束形成系統
        短句來源
             Study on Broadband Antennas with loadings and Radar Cross Section of Complex Targets
             加載寬帶天線和復雜目標RCS研究
        短句來源
             The Development of High-Speed DSP Board and its Application in Real-time Signal Processing of Synthetic Aperture Radar System
             高速DSP板的開發及其在合成孔徑雷達實時信號處理中的應用研究
        短句來源
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        查詢“radar”譯詞為用戶自定義的雙語例句

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          radar
        In the early 1960s research into radar signal synthesis produced important formulas describing the action of the two-dimensional Fourier transform on auto- and crossambiguity surfaces.
              
        Phase retrieval techniques for radar ambiguity problems
              
        The radar ambiguity function plays a central role in the theory of radar signals.
              
        Its absolute value (|A(u)|) measures the correlation between the signal u emitted by the radar transmitter and its echo after reaching a moving target.
              
        This problem is called the "radar ambiguity problem" by Bueckner [5].
              
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        A method based upon simple diffraction theory is described for the calculation of modified paraboloid reflectors to produce from a point source a shaped beam of arbitrary shape in one plane and uniformly narrow in the perpendicular planes. A specific application of the shaped beam antennas is in connection with radar antennas designed for height finding. In this case the antenna must have a sharp elevation beam for obtaining precise elevation information and a rapid elevation scan. The beam must be relatively...

        A method based upon simple diffraction theory is described for the calculation of modified paraboloid reflectors to produce from a point source a shaped beam of arbitrary shape in one plane and uniformly narrow in the perpendicular planes. A specific application of the shaped beam antennas is in connection with radar antennas designed for height finding. In this case the antenna must have a sharp elevation beam for obtaining precise elevation information and a rapid elevation scan. The beam must be relatively broad in azimuth in order that the target will be held in the beam long enough to obtain height information. If a fixed minimum of illumination is to be achieved at a given linear distance on both sides of the center line of the azimuth beam, the amplitude pattern must have the so-called "double cosecant" or "beavertail" shape.

        本論文討論如何利用簡單衍射理論,計算改良拋物面反射器天線幅射之圖型。此反射器可將一無方向性輻射源之能量聚集于任何形狀之波束中。此原理可以應用在地面上或船面上尋求飛機高度雷達天線之設計。在此類雷達中,天線之方位圖型必須為“雙馀割平方”式;其特性為自波束對稱軸線起,至其兩端,輻射一次路程之功率,與方位角之馀割平方成正比。得此圖型之最簡易方法為置一狹窄之鉛垂金屬條于一截形拋物面反射器之中心,金屬條之寬度,可改變波束之方向性;其支距,即金屬條與反射器之距離,可影響兩反射波之位相。故改變金屬條之寬度及其支距,可得欲得之圖型。 利用衍射及干涉理論,計算金屬條及截形拋物面所生之總圖型為:在方位面內,幅射強度J_H與水平角θ之關系為: J_H =AA[sin~2(15πsinθ)/(15πsinθ)~2-2(1-cosπ/4)sin(2πsinθ)/2πsinθ(sin(2πsinθ)/2πsinθ-sin(15πsinθ)/15πsinθ)]A為輻射波振幅,A為A之復共軛數。計算之結果與實驗之結果,頗為一致。

        Attention has been paid to the fact that grouping associatiop between particles exists in clouds as well as in rain. Coherent scattering of radar waves from cloud and rain drops dependent to, each other has been evaluated and a new radar equation derived. The new equation involves the old one as its special form in the case of incoherent scattering. It is found that the effect of coherent scattering in some cases is not quite small and should not be neglected.

        研究了云雨質點對雷達波的相干散射,從而推得比較普遍的雷達氣象方程。舊的雷達氣象方程是新方程在云雨質點互相獨立時的特殊表現形式。對新方程作了一些討論,發現舊方程之所以在某些方面與實驗不符,可能是因為忽略了相干散射作用的緣故。

        A practical means is presented for the design of a coherent Integrating Filter (GIF) covering the whole doppler frequency range with a single channel, as it is much simpler than the usual way of implementing the coherent integration by a large number of parallel channels each matched at a different doppler frequency, therefore it is easier to implement and superior than the parallel matched filters scheme. The paper has analyzed the principle of operation of the GIF, pointed out that it is equivalent to a set...

        A practical means is presented for the design of a coherent Integrating Filter (GIF) covering the whole doppler frequency range with a single channel, as it is much simpler than the usual way of implementing the coherent integration by a large number of parallel channels each matched at a different doppler frequency, therefore it is easier to implement and superior than the parallel matched filters scheme. The paper has analyzed the principle of operation of the GIF, pointed out that it is equivalent to a set of high frequency sweeping comb filters but with no sweeping loss. GIF implements the optimum receiver by inclined cutting the Woodward's "uncertainty function" as contrast with the ax-is parallel cutting implemented by the matched filters.The block diagram of a radar system with GIF is presented in the last section and the choice of some system parameters is explained.

        提出一個具有能在未知多卜勒頻移情況下不需分路的相參積累器,它比一般分路方案可以簡單得多。因此在從噪聲中發現微弱信號的角度來看,優于其他曾提出過的任何積累方案。文中分析了這種積累器的作用原理,提出了利用這種積累器組成的積累濾波器如何能對脈沖串高頻信號獲得最佳信噪比,并用模糊度函數的概念說明了這種積累濾波器的實質,指出它比脈沖串匹配濾波器更優越和具有較大的實現可能性。最后還討論了利用這種設備進行雷達站設計的要點和某些工作參數的選擇與考慮。

         
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