crb 中文意思是什麼
crb
解釋
biological]化學-
Based on the method, this dissertation deals with several kinds of signals including cosine wave ( cw ), linear frequency modulated ( lfm ) and multi - component signal, furthermore the systematic comparison of estimation effect among cwt and several other usual methods as well cramer - rao bound ( crb ) is given
基於上述方法，文中分別對單頻矩形脈沖信號、線性調頻脈沖信號以及多分量信號進行了瞬時頻率估計，並與其他幾種常用瞬時頻率估計方法的性能以及crb進行了系統比較。 -
The crb should determine whether the organization has established the necessary procedures and has fully evaluated its compliance with each of the applicable regulatory requirements
認證機構應判定組織是否已建立了必要的程序，而且組織是否已並充分地評價了與對每一條適用法律的法規要求的符合性。 -
The crb should check the completeness and relevance of identified legal requirements but the crb is not responsible for verifying the identified legal requirements as being the final or definitive list
認證機構應檢查已識別出的法律法規要求的完整性完整性和相關性適用性，但並認證機構並不意味著經過檢查的法律法規清單負責驗證已識別出的法律要求是否為最終最新終或者最具權威的的或者最具權威性的目錄。 -
Crb assessment teams should have sufficient knowledge of the applicable legal requirements that are relevant for the location and environmental aspects of the organization so as to identify significant omissions from their client ' s identified legal requirements
認證機構的審核組應具備充足的、與組織所處區域和環境因素狀況相關的適用法律要求的充分知識，以便發現從他們客戶已識別出的在法律法規要求識別中發現那些的重大遺漏。 -
In the event that certain specific data or other information related to legal or regulatory compliance are not made available to the crb for review because of an assertion of legal privilege or their proprietary nature, certification should not be granted, or should not continue, unless the crb can obtain demonstration by objective evidence that the full system requirements relating to legal compliance, covering the applicable section of the standard, have been effectively implemented by sufficiently documented and verifiable means
如果組織因信息的法律授權或者權屬問題，不能向認證機構提供評價所需的與法律法規符合性相關的特定證據或信息，則認證機構不應授予其證書，或者中止審核；除非組織能夠向認證機構提供客觀證據，表明組織已通過充分的、文件化的、可驗證的方式有效地執行了與法律符合性相根據標準適用章節要求所規定的有關合規守法性的全部體系要求，覆蓋了標準適用的部分。 -
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。 -
During the instantaneous frequency estimation of lfm, there exists some error in the edge, so in the dissertation, a fitting method is proposed to modify it. from the computer simulation, the following result is obtained : for cw, the method based on cwt is most effective, and with the snr rising, the error curve of it is more and more closer to crb. for lfm, the method based on wvd gives the best result, and the effects of cwt and stft are similar for multi - component signal, compared to stft and wvd, cwt is a better choice
通過模擬發現，在單頻回波的瞬時頻率估計中，基於cwt的方法最為有效，隨著信噪比的提高，其均方誤差曲線越來越接近克拉美?羅界；在線性調頻回波的瞬時頻率估計中， wvd法得到的效果最好，而cwt與stft法的估計效果比較接近；在多分量信號的瞬時頻率估計中，相對于stft和wvd法， cwt法是一個更好的選擇。 -
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。 -
4 ) a uniform crb expression of bearing estimation for spatially distributed sources in unknown noise environments is derived. more exactly, the crb performance of bearing estimation for spatially distributed sources in several typical spatially - correlated noises is evaluated theoretically and numerically, respectively. it is disclosed that the estimated errors mainly depend on space ambiguity between signal and noise components
4 ）推導了未知噪聲環境中空間分佈源波達方向估計的統一的crb表達式，分析了幾種典型的空間色噪聲情況下分佈源波達方向估計的極限性能，揭示了信號分量和噪聲分量之間的空間混疊對分佈源波達方向估計的決定性作用。
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