直達信號 的英文怎麼說

中文拼音 [zhídáxìnháo]
直達信號 英文
direct path signal
  • 直 : Ⅰ形容詞1 （成直線的; 硬挺的） straight; stiff 2 （跟地面垂直的; 從上到下的; 從前到后的） erect; v...
  • 達 : Ⅰ動詞1 （暢通） extend 2 （達到） reach; attain; amount to 3 （通曉; 明白） understand thoroughly...
  • 號 : 號Ⅰ名1 （名稱） name 2 （別號; 字） assumed name; alternative name3 （商店） business house 4 （...
  • 直達 : through; nonstop
  1. It was found that they were fit for the lpi applications. on the digital signal processing, we studied the demand on compute ability for fast acquest. we designed a new signal form named ds - fh - th signal which costs less in processing but without any lost on the lpi performance

    在信號的數字處理方面，分析了直接序列擴頻雷達在信號捕獲階段對計算能力的要求，在不降低系統lpi性能的基礎上，設計了ds - fh - th雷達信號，降低系統對計算能力的要求。
  2. The video signal is directed to the crt through a sound trap which eliminates the sound-carrier frequency.

    視頻信號通過聲音陷波電路，消除聲音載波頻率，直達CRT。
  3. The torque motor received dc current signals from the electric control and applies torque to the single - piece armature and flapper which is supported on a torsion flexure

    力矩馬達接收來自電氣控制器的直流電信號並將力矩施於由轉矩撓曲支撐的整體式電樞及擋板。 ？
  4. We generated a recombinant eukaryotic gene expressing vector harboring a full - length hgh gene, 2. 4 kb genomic dna with four introns and the signal peptide sequence cloned to the eukaryotic gene expressing vector pcdna3. 0

    我們直接將含有4個內含子和自身信號肽的2 . 4kb全長人生長激素基因直接克隆至真核表達載體pcdna3 . 0 ，然後利用脂質體轉染家蠶bmn細胞，瞬時表達hgh 。
  5. The master dissertation introduces passive correlative orientation system and base theory in signal dispose briefly in the first place. the system takes tv sound fm signal from tv satation signal. the power rate of tv station signal to sound signal is ten to one. in the case of submerged by mussy weave and machine ' s hot noise, dispersed target signal is feeble

    系統採用電臺的電視伴音調頻信號，其中電臺信號與伴音信號功率之比基本為10 ： 1 ，並且目標散射信號較弱，一般情況下淹沒在雜波和機器熱噪聲之下，採用常規的脈沖檢測方法很難對遠距離的目標進行檢測，而以電臺直達信號作為參考與目標回波信號進行相關檢測；系統中信號的相關處理會產生旁瓣，而強目標的旁瓣會影響附近的弱目標檢測。
  6. 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。
  7. 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 ） 。
  8. From the result we get the following conclusion : for narrow - band signal, the effect of the method based on fft is best. for wide - band signal, when snr is up to certain degree ( higher than - 7db or so ), the curves of square error of modified methods are more obvious and closer to crb. for an echo composed of more than one frequency or direction, space - frequency distribution could show more direct information of frequency and direction, which is more advantaged to make precise judge and estimation for doa of echo

    從估計結果發現，對于窄帶回波信號，基於fft的方法估計性能大大優于其他方法；對于寬帶回波信號，在信噪比達到一定程度（高於約- 7db ）時，補償后的幾種估計法的性能改善均比較明顯，誤差曲線越來越接近crb曲線；對于回波中存在多頻率多方位的情況，空間?頻率分布圖能提供較為直觀的頻率及方位信息，因此應用空間?頻率估計法來進行方位估計，更有利於進一步對回波的具體方位進行準確判斷和估計。
  9. The carrier wave is modulated directly by the baseband signal at several frequency point in l band and s band. firstly, this paper clarifies the theory of i / q modulation, elaborates evm and acpl, and analyzes the effect of amplitude and phase unbalance and dc offset on evm. secondly we review the basic principle of phase locked loop and it ’ s composing parts, including the basic conception and design method of pll frequency synthesizer, especially introduce the charge pump pll frequency synthesizer in detail

    首先，在闡述i / q正交調制基本原理的基礎上，通過對誤差矢量和鄰近通道功率泄漏的詳細分析，定性、定量地討論了各種非理想電路因素（如相位不平衡、幅度不平衡、直流偏差等）對調制器性能的影響;其次，介紹了鎖相環的工作原理和基本組成部分，包括鎖相環的設計和環路濾波器的設計，特別詳述了電荷泵鎖相頻率源;第三，介紹了採用直接調制技術模擬衛星信號的射頻前端的設計;最後，對整個直接射頻調制系統進行測試，結果基本上達到了課題要求。
  10. The missile "rides" the beam; that is, it follows the radar signal until it hits the target.

    導彈就駕馭著該波束，即跟著雷達信號直到擊中目標為止。
  11. Analyze the linear dipole array with uniform element spacing using the method of moments ( mom ), derive the analytical expression for the recovered signal with the direct data domain method, demonstrate the effect of the mutual coupling on the performance of the antenna array by examples, the degradation of the system caused by the mutual coupling is simulated and analyzed in two different electromagnetic environments such as the weak and strong interference

    用矩量法計算了幾個信號同時照射時對稱陣子均勻直線陣的電流分佈，用直接數據域演算法推導了此接收陣列的恢復期望信號的表達式，舉例說明了互耦對陣列天線性能的影響，數值模擬了在弱干擾和強干擾下，互耦造成系統性能下降的情況並分析了原因。
  12. The video signal is directed to the crt through a sound trap which eliminates the sound - carrier frequency

    視頻信號通過聲音陷波電路，消除聲音載波頻率，直達crt 。
  13. Dna and rna dot blotting revealed that the f gene was transcribed into mrna in the vero cells. there was expression of the f protein as shown by indirect immunofluorescent assay. the expression began at 48h post - infection and increased thereafter, as indicated by elisa

    將真核表達質粒pcdna3 - f高壓電轉化dam和phop基因雙突變的減毒鼠傷寒沙門氏菌zj111株（ zj111 / pcdan3 - f ） ，並直接轉染vero細胞，分別提取細胞總dna和總rna ， dig標記探針均可檢測到陽性雜交信號。
  14. Take bus 44m and alight at tsing yi police station. turn into chung mei road and reach the entrance of sheung ko tan street. after walking along the steps ( beside lutheran village s name plaque ) to fung shue wo road, you will see the chun kwan temple ( next to tsing yi rural committee )

    交通：巴士44m于青衣警署下車，步行往涌美路到上高灘街街口直入，于信義村村牌處沿旁邊的樓梯到楓樹窩路，便可見到真君廟（青衣鄉事會辦事處側） ，亦可於葵芳地鐵站乘搭專線小巴88d號直達真君廟。
  15. Motion control is a comprehensive subject. modern ac drive is a important embranchment in the field of motion control. however, it is difficult to rea1ize high - performance ac drive systems because induction motors are a kind of strongly - coupled nonlinear system with many variables and the torque is not easy to control. with vector control technology decoupling and torque control of ac motor are solved. the basic idea of vector control is that three - phase system is equiva1ent to two - phase system by coordinate transformation and it realizes the decoupling between field current and torque current of the stator in order to control the flux and current respectively, thus induction motor can be considered dc motor and high performance is achieved easily. with the progress of electric and electronic technology and the development of computer, high - integrated special modules and high - precision digital signal processor ( dsp ) are applied to ac drive so that vector control has been developed rapidly

    但是高性能的交流調速系統實現很困難，這是因為交流電機是多變量、強耦合的非線性系統，不易實現高性能轉矩控制。矢量控制技術則解決了交流電機解耦與轉矩控制問題，其基本思路? ?應用坐標變換將三相等效為二相，實現定子勵磁電流分量與轉矩電流分量之間的解耦，達到對交流電機磁鏈與電流分別控制的目的，交流電機等效為直流電機實現高性能調速。隨著電力電子技術的進步，計算機技術飛躍發展，高度集成的專用模塊和高精度的數字信號處理器應用於交流傳動系統中，促進矢量控制迅猛發展，日趨成熟。
  16. Based on the facts that time of arrival ( toa ) of the first multipath signal is always most close to that of los propagation and angle of arrival ( aoa ) of the first multipath signal is not always most close to that of los propagation among all multipath signals in nlos propagation environment, a location algorithm is proposed to mitigate the influence of nlos propagation, which effectively reduces the feasible region of a ms in macrocells

    依據在非視距傳播環境下存在的以下兩個事實：第一，最先到達多徑信號的波達時間總是最接近直達波的波達時間。第二，最先到達多徑信號的波達方向並不一定最接近直達波方向。針對宏蜂窩系統，從有效減小移動臺可行域的角度，提出了一種減輕非視距影響的定位演算法。
  17. In wcdma system which uses direct sequence to spread spectrum, the spread spectrum code ( pn code ) phase of the receiver must be synchronized with that of the received signal precisely to despread and demodulate the signal correctly. multipath channel exists in the mobile communication environment for the radio signal reflection by obstacles between transmitters and receivers. by using the autocorrelation of the spread sprectrum code, rake receiver can process received signals and therefore multipath components can be resolvable

    在wcdma系統中，為正確解擴解調接收到的擴頻信號，接收機本地產生的擴頻碼（ pn碼）相位必須和接收信號中的擴頻碼相位完全同步;同時移動通信環境中的傳輸信號由於接收機和發射機之間的直達路徑有可能被建築物或其他障礙物所阻礙，總是經過折射或反射的多條路徑后才到達接收機，從而產生多徑通道。
  18. First of all, three de - correlation methods are introduced for the purpose of deducing the correlation between the direct signal and the reflected one. then one of them is combined with classical music algorithm to do doa estimation

    為了減小直達信號與反射信號間的相關性，先介紹了三種去相關的方法，再採用其中一種方法結合經典的music演算法來做doa估計。
  19. At this moment, both the direct signal and the reflected one impinge into the array, and make the amplitude and phase of the echo change, which cannot be separated from the direct one, thus cause server errors of elevation ’ s estimation, even the failure of tracking

    此時直達信號與反射信號同時進入天線，造成回波幅度與相位的變化，並且這種變化不能從直達信號中分離出來，從而造成目標仰角估計的嚴重誤差，甚至引起跟蹤的失效。
  20. The video simulator is of significant flexibility and commonality. so long as the simulation software is changed, simulation of different radar signals can be implemented. the video simulator can dominate radio frequency ( rf ) equipment to export rf pulse to implement the function of radar signal environment integrated simulation system

    模擬器控制射頻設備輸出的射頻脈沖，既可作為注入信號直接輸入雷達偵察接收機，也可以放大到足夠的功率后通過天線輻射，作為微波暗室的輻射源，實現雷達信號環境一體化模擬系統的功能。
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