coherent domain 中文意思是什麼
coherent domain
解釋
聚合疇-
Due to the short distance among the planes which fly in a group, the conventional low resolution radar can not distinguish them in both distance and azimuth ? if we use the technology of isar to resolve the difference among doppler frequency of the targets and obtain a fine resolution cross - cross image, we may separate them, but a long time of coherent processing is needed <, for the formation targets, it can be approximately divided to rigid body and nonrigid body, so for the formation targets, that can be regarded as rigid which has a relative position and an identical movement, can be approximately considered as a large target, and be compensated by translational phase with the rule of minimum entropy, but for the most those cannot accord with the approximation of rigid, being the doppler - frequency of the aim is linear changed, by the relax method with short data, increases the resolving performance of multiple target to the aim in the frequency domain, since cross - range resolution is based on the accumulative time, so it is greatly improve the resolution to formation targets by the instant cross - range image which produced by radon - wigner transformation
低分辨isan成像及干涉技術應用研究一因此直接無法分辨編隊目標的架數，我們借鑒isar的技術，通過較長時間的相干積累，在多普勒頻域上對目標進行分辨。而對于編隊目標，可分為近似剛性的多目標和非剛性的多目標，所以對于可以近似為剛體的編隊目標相對位置固定，運動方式一致，可以近似看作一個大目標，採用最小墑準則對平動相位的進行補償，但是大多數並不滿足剛體近似的編隊目標，由於目標在相干積累時間的多普勒頻率近似呈線性變化，通過對較短數據利用relax的時頻分析方法，提高了頻率域上目標分辨的性能。由於橫向解析度取塊于橫向積累時間，所以利用radnwigner變換得到瞬時的一維橫向距離像大大提高了對編隊目標的分辨，對模擬和實測數據的大量分析結果表明此方法的有效性和可行。 -
According to these accomplishments, several techniques are expounded emphatically in this paper, including 3d refraction statics, coherent noise suppression by prestack wave field separating ( prestack fx noise attenuation ), 3d prestack multiple domain random noise attenuation, multiples attenuation, nmo of unsymmetrical hyperbola, dynamic replacement of wave equation, surface - inconsistent residual static, super bin stacking, poststack depth migration and prestack depth migration. all the techniques have been applied in seismic processing of 2d, 3d and wide - line profiling and obtained good results
本文根據項目組研究成果，重點閘述了三維折射波靜校正技術，疊前波場分離相干噪音壓制方法（疊前fx去噪） ，疊前三維多域隨機噪音衰減技術，多次波衰減技術，非對稱雙曲線動校正技術，波動方程動態替換技術，非地表一致性的剩餘時差靜校正技術，超面元迭加處理技術，疊后深度偏移處理，疊前深度偏移處理等。 -
Time domain synchronous averaging can reduce the signal not coherent to rotation frequency effectively, and extract the repetitive signals directly related to machine operation condition
而時域同步平均可以有效衰減與回轉頻率無關的干擾，提取與工作狀態直接相關的周期信號。 -
From the point of spatial frequency domain the paper applies the spatial frequency transformation to analyze the awg transmission characteristics and probes into the function of fourier transform, the characteristics of coherent system and its application in optical information process domain
論文應用傅立葉光學的空間頻域變換，從空間頻域的角度分析了awg的傳輸特性，探討了awg的傅立葉變換功能及其相干系統特性，以及它在光信息處理領域中的應用。 -
However, the high demand in frequency domain involves precise synchronization both in time and frequency domain. while because of the different channel characteristics in each channel, the receiver needs some mechanisms to characterize the channel effects in coherent demodulation
然而，頻域的高要求對應于同步技術的高要求；另外，各個子通道不同的通道特徵，要求接收端相關解調用一定的機制來近似每個子通道的通道特徵。 -
Based on the theory of partial coherent diffraction and frt, an approach for fractional fourier domain filtering is presented as a new wavefront engineering method to improve the image quality in photolithography
基於部分相干成像理論和分數傅立葉變換濾波等理論，我們提出了利用分數傅立葉域濾波改善光刻成像質量的波前工程新思想和新方法。 -
Based on the coherent reception theory of radio signals and the theory of digital signal processing, the effects of carrier frequency offset, sampling clock offset, and symbol timing offset on ofdm signals are exploited. a series of amendments and new algorithms is derived from the in being algorithms of guard interval based symbol timing and frequency offset estimation, frequency - domain frequency offset, sampling offset, and symbol timing offset estimation
以無線信號的相干接收和數字信號處理理論為基礎，就載波頻偏、采樣鐘偏差和符號定時偏差對ofdm信號的影響進行了分析，對基於保護間隔的符號定時與載波頻偏估計演算法和多種現有頻偏、采樣鐘與符號定時偏差的頻域估計演算法進行了研究，提出了一系列改進措施與新演算法。 -
If the target has a radial acceleration, conventional 2d - fft based data processing method will lead to a doppler spread in doppler domain. the high resolution of doppler domain due to coherent integration no longer holds, which is very important in target detection of othr
常規的二維fft處理在處理機動目標時往往由於目標存在徑向加速度而會在多普勒域造成多普勒擴展，從而無法應用相干積累帶來的多普勒域的高分辨力完成對目標的檢測。 -
Finally, we model radar calibration software by means of unified modeling language ( uml ), analyze its domain, and obtain domain characteristics, coherent and constant for calibration software. according to the above analysis result, we design reused radar calibration software
最後，運用統一建模語言uml對雷達標校軟體進行建模，並對標校軟體進行領域分析，得出標校軟體的領域特徵及標校軟體的一致性和不變性。
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