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1.
与传统的侧扫声纳相比,合成孔径声纳系统具有全覆盖无遗漏扫测,测量范围大、速度快,图像分辨率高等优点。本文介绍我国引进第一套SHADOWS合成孔径声纳系统的技术性能,分析SHADOWS合成孔径声纳系统性能测试情况及实际测量中的应用价值,提出了存在的问题及其对策。  相似文献   

2.
与传统的侧扫声纳相比,合成孔径声纳系统具有全覆盖无遗漏扫测,测量范围大、速度快,图像分辨率高等优点.本文介绍我国引进第一套SHAD)WS合成孔径声纳系统的技术性能,分析SHADOWS合成孔径声纳系统性能测试情况及实际测量中的应用价值,提出了存在的问题及其对策.  相似文献   

3.
合成孔径声纳技术逐渐成为海底探测领域的热门研究方向,其在地貌成像、沉底和掩埋小目标成像、海底管道探测等方面的应用均取得重要进展。文中系统阐述了合成孔径声纳技术的工作原理和研究现状,重点介绍了双频双侧合成孔径声纳的技术优势。结合海底管线探查案例,详细分析了该设备的应用情况,并与浅地层剖面仪实际获取的图像进行了对比,验证了双频合成孔径声纳在海底探测中的适应性和探测能力,最后对该技术的研究与应用方向进行了展望。  相似文献   

4.
从合成孔径声纳的基本原理、研究进展、应用,以及实际应用中存在的问题等几个方面,探讨了该技术在海底管道探测方面的应用潜力。国内外一些海域开展的探索性应用显示,该技术可以对海底管道的埋设状态及其周边海域地形地貌和其他小目标清晰成像,并且能够获得管道状态和位置等的细节信息。然而,鉴于海洋水声环境的复杂性和特殊性,SAS在实际应用中仍存在一些问题,需要在信号处理方法、作业方式等方面进行更为深入的研究探索。  相似文献   

5.
1 概述 70年代,随着合成孔径雷达(SAR)技术的推广应用,合成孔径声纳理论也应运而生。进入90年代后,美、欧等国相继开展了旨在开发具有高分辨率的用于海底测图的合成孔径声纳(SAS)系统的研制。由欧共体资助的几家欧洲研究机构合作,成功地研制了ACID-SAS系  相似文献   

6.
<正>全球唯一的小型合成孔径声纳来到中国!型号:AQUAPIX MINSAS制造商:加拿大Kraken Sonar Systems公司中国独家代理:青岛领海海洋仪器有限公司加拿大Kraken公司是目前世界唯一的商业化生产的小型相干合成孔径声纳(Synthetic Aperture Sonar,简称SAS)的制造商,AquaPix系列合成孔径声纳性能超过多家军方产品,但价格仅为同类产品的1/3~1/5。MINSAS合成孔径声纳的技术优势:优势1:超高分辨率海底地形地貌成像:在全覆盖范围内的分辨率保持一致,不分远近,均为3cm×1.5cm;优势2:超宽覆盖,中心频率300kHz,单侧范围100~300米(声纳距底高度的10倍);  相似文献   

7.
鉴于海底光缆路由探测成果可为已有光缆维护与新增光缆铺设提供数据服务和决策支持,以我国东部海域某地区的海底光缆为例,对泥沙掩埋海底光缆进行探测与定位研究。针对上覆泥沙介质强波阻抗界面与海底光缆管径较小的特点,采用具有孔径合成、低频穿透、高分辨率特点的合成孔径声纳技术,对海底光缆的路由情况进行研究。实践证明,合成孔径声纳技术在泥沙掩埋海底光缆探测和识别方面取得良好的探测效果,可在实际工程中推广应用。  相似文献   

8.
合成孔径聚焦成像方法(SAFT)具有分辨率高、能在近场区工作的优点,是超声成像领域发展起来的新技术。文中介绍了合成孔径超声成像的原理,根据换能器阵列的声场辐射理论建立了数学模型,利用MATLAB对模型进行了数值仿真,最后进行了合成孔径超声成像实验。实验结果表明,合成孔径成像方法能够有效提高成像系统的分辨率。  相似文献   

9.
侧扫声纳数据库管理设计   总被引：1，自引：0，他引：1  
海底地貌声纳图像作为新的遥感影像数据源，其数据管理问题日益突出。针对声纳图像的特点，分析研究了声纳图像的管理方法，并实现声纳图像数据库管理的功能。  相似文献   

10.
侧扫声纳图像增强技术   总被引：1，自引：0，他引：1  
随着海洋探测技术的飞速发展，侧扫声纳的图像质量和定位精度迅速提高，其应用日益广泛和深入。在声纳图像判读分析时，常常需要进行辐射改正和均衡增强。根据海底地貌声纳图像的特点，归纳了几种有效、适用的图像增强方法，并建立了声纳图像分析软件。  相似文献   

11.
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12.
This paper presents observations of a buried sphere detected with a low-frequency (5–35-kHz) synthetic aperture sonar (SAS). These detections were made with good signal-to-noise ratios (SNRs) at both above and below the critical grazing angle. The raw data for the below-critical-grazing angle detection shows that the acoustic penetration is skewed by the 29$^{circ}$ offset of the ripple field relative to the sonar path. This observed skew is in agreement with T-matrix calculations carried out to model penetration into the bottom via ripple diffraction. Additionally, measured SNRs over different frequency bands are compared to predictions made using both first- and second-order perturbation theory for ripple diffraction. Both the data and the models indicate a peak detection region around 25 kHz for the environmental conditions present during the test. These results confirm that ripple diffraction can play a critical role in long range (subcritical angle) buried target detection.   相似文献   

13.
The eight papers in this special issue focus on synthetic aperture sonar. The focus is on signal processing and performance characterization for synthetic aperture imaging sonars, with emphasis on systems that operate in stripmap mode--a monostatic approach utilizing broadside beams, and which represents the majority of designs currently seeing practical application.  相似文献   

14.
A shadow cast by an object on the seafloor is important information for target recognition in synthetic aperture sonar (SAS) images. Synthetic aperture imaging causes a fundamental limitation to shadow clarity because the illuminator is moved during the data collection. This leads to a blend of echo and shadow, or geometrical fill-in in the shadow region. The fill-in is most dominant for widebeam synthetic aperture imaging systems. By treating the shadow as a moving target and compensating for the motion during the synthetic aperture imagery, we avoid the geometrical shadow fill-in. We show this to be equivalent to fixing the focus at the range of the shadow caster. This novel technique, referred to as fixed focus shadow enhancement (FFSE) can be used directly as an imaging method on hydrophone data or as a postprocessing technique on the complex SAS image. We demonstrate the FFSE technique on simulated data and on real data from a rail-based SAS, and on two different SAS systems operated on a HUGIN autonomous underwater vehicle.   相似文献   

15.
Synthetic Aperture Sonar: A Review of Current Status   总被引：1，自引：0，他引：1  
This is a review paper that surveys past work in, and the recent status of, active synthetic aperture sonar (SAS). It covers the early historical development of SAS with its provenance in synthetic aperture radar (SAR) and flows through into what work has been published in the open literature up to early 2007. The list of references is sufficiently complete to include most past and recent SAS publications in the open refereed literature.   相似文献   

16.
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17.
The relative height of the seafloor can be estimated by using two vertically displaced receivers. In this paper, we propose techniques to improve the accuracy of the estimated height. Our results are based on the use of synthetic aperture sonar (SAS) imaging, which implies coherent addition of complex images acquired from a moving platform. The SAS processing improves the along-track (or azimuth) resolution, as well as the signal-to-noise ratio (SNR), which in turn improves the estimated height accuracy. We show that the shift of the effective center frequency induced by coherent, frequency-dependent scattering affect the time-delay estimates from complex cross correlations, and we propose a correction technique for broadband signals with uneven magnitude spectra. To reduce the effect of geometrical decorrelation and increase the coherence between the images, we beamform the sonar images onto an a priori estimate of the seafloor height before correlating. We develop a mathematical model for the imaging geometry. Finally, we demonstrate our proposed estimators by providing relative seafloor height estimates from real aperture and SAS images, obtained during the InSAS-2000 experiment at Elba Island in Italy. In particular, we demonstrate that the SAS image quality is significantly improved by inclusion of the height estimates as a priori information.  相似文献   

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