doa 中文意思是什麼

doa 解釋
到達時已死
  1. Browse more free doa beach volleyball photo from our gallery

    生與死極限沙灘排球
  2. Browse more free doa beach volleyball image from our gallery

    生與死極限沙灘排球
  3. Browse more free doa beach volleyball poster from our gallery

    生與死極限沙灘排球
  4. Browse more free doa beach volleyball picture from our gallery

    生與死極限沙灘排球
  5. A doa estimation algorithm for multipath signals based on burg iterations

    基於貝葉斯網路的并行分佈估計演算法研究
  6. Before using phase - only algorithm to achieve nulling, estimations of the number of interferential sources and the doa of interferential signals are needed. so, the spatial spectrum estimation basd on the maximum likelihood method ( capon method ) and music algorithm used for detecting the number of interferential sources and the doa of interferential signals are discussed in the second chapter

    在採用phase - only演算法進行波束置零之前，需要估計干擾源的方向和個數，因此本文還在第二章介紹了發射數字波束形成中用於測定干擾源個數和方向的空間譜估計法? capon演算法和music演算法的測向原理，並分析了它們的性能和優缺點。
  7. In the work, it was systemically studied that the effects of two suggested modifying ways on electrochemical characteristics of lithium metal electrode and its behaviors in lithium cell. finally, the action mechanisms of these two modifying ways were analyzed. through the study on pretreatment effects of different cyclic ether on lithium electrode, it was found that 1, 4 - dioxane ( doa ) and 1, 3 - dioxolane ( dol ), both could form a favorable passivating sei film on lithium electrode surface through

    研究不同環醚對鋰電極的預處理作用發現， 1 ， 4 -二氧六環（ doa ）和1 ， 3 -二氧五環（ dol ）對金屬鋰電極的表面預處理均可以在金屬鋰表面形成一層良好的sei鈍化膜，對鋰金屬電極起到了保護性作用，使鋰電極具有較小的界面阻抗，有效地提高了金屬鋰電極的充放電循環效率，改善了鋰金屬電極在循環過程中的表面形貌;而doa和dol對金屬鋰電極的表面預處理，不會明顯的影響鋰電極的動力學性能。
  8. So far, there has been plenty of theory and method serving for doa. among them, one method has been paid much attention for worldwide researchers who have spent more than 30 years to develop and perfect it. this is the namable " time delay estimation ( tde ) "

    而在這些眾多的方位估計方法中，有一種方法讓世界范圍的科研工作者為之關注並已花費了三十余年的時間去不斷地發展和完善它，這就是著名的「時延估計法（ timedelayestimation ） 」 。
  9. Browse more free doa beach volleyball pic from our gallery

    生與死極限沙灘排球
  10. Doa patients with return of heart rate after resuscitation

    Doa病患急救后心跳回復率
  11. All of above presents the data to study the algorithm which will be used to detect the targets against the broadened bragg lines. eigenstucture - based algorithms are used to realize bearing resolution on the basis of synthetically comparing several classical algorithms. first sea echo ’ s bearing prior knowledge is utilized to constitute project operator to constraint the noise subspace estimation with the use of constrained music algorithms, which largely increases the resolution and doa estimated accuracy

    為檢測海上目標的方位信息，在綜合分析比較各類演算法的基礎上，本文採用特徵結構類演算法來實現空間方位分辨中的constrainedmusic演算法，此方法充分利用了海浪的方位先驗信息來構造投影運算元約束噪聲子空間的估計，大大提高了目標解析度和估計精度。
  12. The algorithms estimate the doa of the broadband distributed source fron the secondary diagonal elements of the covariance matrices generated from every frequency domain of the received broadband signals, thus avoiding unwrapping of phases

    該類演算法首先將陣列接收的寬帶信號變換到頻率域，然後對于每個頻率形成陣列接收信號協方差陣，最後由該協方差陣的次對角線元素估計寬帶分佈源的到達角，其主要特點是避免了相位展開。
  13. Detailed work include : generalizing, analyzing, mathematically calculating, im - proving and estimating by experiments the 2d - doa estimation from the classical al - gorithm of 1 - d subspace. moreover, application and simulation of the properties of the cyclostationary of signals in parameter estimation within smart antennas area are studied as well

    具體工作包括：經典一維子空間演算法推廣到二維中的分析，演算，改進，實驗模擬；以及信號平穩特性在智能天線參數估計中的應用和實驗模擬。
  14. Abstract ： to obtain the high frequency ( hf ) array signals, an applied circuit called hf array signals generator is designed using dsp and duc ( digital up converter ). the generator simulates the generation of output signals of 9 - element arrays with different array format, different direction of arrival ( doa ) and existing cochannel signals respectively

    為了在實驗室中獲得短波天線陣列信號，應用dsp晶元和duc晶元（數字上變頻器）設計了一個實用電路短波陣列信號發生器，模擬實現了短波九元天線陣的多種陣型、不同來波方向及存在同頻多信號時的陣列輸出信號。
  15. 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。
  16. At first some modification is made in conventional beam forming of frequency domain, namely to estimate doa by arrays outputs on compensated spacial frequency points of echoes. then the cwt is utilized to signal processing in space - frequency domain for estimation of doa, and the corresponding modification is also made. in the dissertation, the computer simulations of doa estimation for both narrow - band and wide - band echoes are given, so do the necessary comparison among several methods and crb

    首先在傳統的頻域波束形成演算法的基礎上，提出對寬帶信號的頻率補償，也即對寬帶回波信號的各空間頻率根據時間頻率的差異進行相應補償，然後對各陣元輸出求和來得到方位估計；其次將連續小波變換引入到空間?頻率處理中，從而完成對目標方位的估計，並進行了相應地補償。
  17. In the near future, after the prototype program has been tested successfully, the crops specific frex will be developed in cooperation with doa major crops soil - scientists

    不久的將來，一旦標準程序試用成功，就將與農業部從事主要作物研究的土壤學家共同開發作物專用「肥料推薦專家系統」軟體。
  18. A doa estimation algorithm for coherent signal based on the fourth - order cumulant

    時空欠采樣寬頻段信號頻率和二維角估計方法
  19. Doa stands for " dead on arrival ", a common auction term that means the seller guarantees the item will work when it arrives at your house

    波達主張"死亡"拍賣名詞即共同賣方擔保項目時將到達你家
  20. When i had a terrible accident in amsterdam, i came out of a coma 40 hours later in the intensive care unit of the university hospital there. the surgeons had performed brain surgery. later, they told me i was 20 minutes from being doa dead on arrival

    記得在阿姆斯特丹發生意外，不曉得過了多久我才醒過來，我想那腦部手術持續了12小時他們把我送往醫院時，我已昏迷，醫生說：遲20分鐘到達就會不治。
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