synthetic aperture sonar 中文意思是什麼
synthetic aperture sonar
解釋
合成孔徑聲吶-
The thesis reviews the theory which is the basis of synthetic aperture processing and introduces five algorithms of image reconstruction : the coherent addition provides a good opportunity for the real time sas ; the envelope processing can work when sonar echo returns lack phase coherence ; the i - q processing can reduce the sampling rate ; the broadband and ctfm processing are both aimed to increase the sas mapping rate
討論了用於重構圖象的五種演算法，包括簡單的可進行實時處理的相關合成法，可以在缺乏相位信息時使用的包絡處理法，可以降低采樣率、減少運算量、存儲量的正交處理法，可以提高聲納運行速度，從而提高成象率的寬帶處理法和ctfm法等五種演算法。 -
A study on synthetic aperture sonar movement compensation based on displaced phase center algorithm
基於位移相位中心演算法的合成孔徑聲納運動補償研究 -
Interferometric synthetic aperture sonar ( insas ) provides a means of obtaining 3 - dimensional images of scene. three - dimensional information is derived from the phase difference between two ( or several ) complex images of sas taken from separate receiving array across the track
干涉合成孔徑聲納（ insas ）是在合成孔徑聲納（ sas ）基礎上垂直航跡方向增加一副（或多副）接收基陣，通過比相測高的方法得到場景的高度信息，從而得到場景的三維圖象。 -
This paper focuses on exploring the key technique to the application of synthetic aperture sonar - imaging algorithm and movement compensation, more exactly
本文的研究重點在於探索影響合成孔徑聲吶實用的關鍵技術。具體來說，在於成像演算法和運動補償技術的研究。 -
Even so, the special advantage of synthetic aperture sonar ( sas ) ( getting high resolution by using low frequency and small elements ) makes it one focus of underwater acoustic research. sas can be called high technology in underwater acoustic field
盡管如此，合成孔徑聲吶的獨特優點（利用低頻小尺寸基陣即可獲得高方位分辨力）已使關於它的研究成為水聲研究的熱點之一，合成孔徑聲吶可稱得上水聲領域的高技術。 -
The image registration was discussed the following three steps : initial registration, pre - filtering, sub - pixel registration. an adaptive range - filtering algorithm was proposed, which filters the different parts of object spectrum in master and slave synthetic aperture sonar images
干涉sas復圖像的配準按實際信號處理過程分三個步驟論述：初配準、頻譜預濾波和子像素級配準，其中針對預濾波提出了一種自適應的距離向頻譜濾波方法。 -
The thesis involves all - aspect of the signal processing of interferometric synthetic aperture sonar, especially in the challenging problems such as phase - preserved sas imaging algorithm, image registration, interferogram denoising filtering and two - dimensional phase unwrapping. in allusion to difficulties and emphases, some new methods are proposed. the study is important to prompt the development of interferometric synthetic aperture sonar in china
本論文對干涉合成孔徑聲納信號處理過程進行了全面的論述，對其中的關鍵技術如保相的二維成像演算法、復圖像配準、干涉圖降噪濾波和二維相位展開作了重點分析，並提出了一些新的方法，論文對推動我國干涉合成孔徑聲納信號處理技術的研究具有重要的意義。 -
Synthetic aperture technology origins from radar field firstly. the main reasons for its unsuccessful application in sonar are the low sound speed ( compared with light ), irregular carrier movement and the complexity of underwater acoustic environment
合成孔徑原理最早來源於雷達領域，但它在水聲領域的應用遠不如在雷達領域應用得成功，其原因主要在於水中相對較低的聲傳播速度（相對于光波波速） 、聲吶載體的不規則運動和水聲環境復雜性的影響。
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