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渔业声学数据后处理软件现状评述与展望:以Sonar5-Pro为例
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作者 张辉 《渔业信息与战略》 2024年第1期29-38,共10页
渔业声学数据解析是渔业资源声学调查研究和应用的关键所在。目前全球渔业声学数据后处理的代表性软件主要有挪威Sonar5-Pro和澳大利亚Echoview。以Sonar5-Pro为例,开展了5个方面的研究:1)回顾了该软件自1994年以来近30年的发展历史;2)... 渔业声学数据解析是渔业资源声学调查研究和应用的关键所在。目前全球渔业声学数据后处理的代表性软件主要有挪威Sonar5-Pro和澳大利亚Echoview。以Sonar5-Pro为例,开展了5个方面的研究:1)回顾了该软件自1994年以来近30年的发展历史;2)介绍了软件对声学数据进行处理的总体思路,即前处理、数据分析和结果展示3个步骤及贯穿始终的数据检视功能,以及软件的5项重要设计理念;3)介绍了该软件9项代表性功能特性的实现思路和具体方法;4)以主流分析应用鱼类生物量分析过程为例,介绍了软件的数据处理流程;5)对该软件的3项核心关键技术,即多目标跟踪(multiple target tracking)、交叉过滤跟踪(crossfilter tracker)和图像分析工具(image analysis)进行了详细介绍。研究发现,一个成熟的渔业声学数据后处理系统庞大而复杂,涉及渔业、物理学和计算机多学科知识的融合,着力加强相关领域交叉学科人才培养,充分借鉴吸收国外已有先进理念和成熟技术,基于各种应用场景需求研发具有自主知识产权的分析软件,采用引进消化吸收再逐点突破最终集成创新的方式,可以作为未来提升中国渔业声学数据解析能力和水平的重要发展途径。 展开更多
关键词 渔业声学 渔业声呐 探鱼仪 回声图 数据处理 sonar5-Pro
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RepDNet:A re-parameterization despeckling network for autonomous underwater side-scan sonar imaging with prior-knowledge customized convolution
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作者 Zhuoyi Li Zhisen Wang +2 位作者 Deshan Chen Tsz Leung Yip Angelo P.Teixeira 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2024年第5期259-274,共16页
Side-scan sonar(SSS)is now a prevalent instrument for large-scale seafloor topography measurements,deployable on an autonomous underwater vehicle(AUV)to execute fully automated underwater acoustic scanning imaging alo... Side-scan sonar(SSS)is now a prevalent instrument for large-scale seafloor topography measurements,deployable on an autonomous underwater vehicle(AUV)to execute fully automated underwater acoustic scanning imaging along a predetermined trajectory.However,SSS images often suffer from speckle noise caused by mutual interference between echoes,and limited AUV computational resources further hinder noise suppression.Existing approaches for SSS image processing and speckle noise reduction rely heavily on complex network structures and fail to combine the benefits of deep learning and domain knowledge.To address the problem,Rep DNet,a novel and effective despeckling convolutional neural network is proposed.Rep DNet introduces two re-parameterized blocks:the Pixel Smoothing Block(PSB)and Edge Enhancement Block(EEB),preserving edge information while attenuating speckle noise.During training,PSB and EEB manifest as double-layered multi-branch structures,integrating first-order and secondorder derivatives and smoothing functions.During inference,the branches are re-parameterized into a 3×3 convolution,enabling efficient inference without sacrificing accuracy.Rep DNet comprises three computational operations:3×3 convolution,element-wise summation and Rectified Linear Unit activation.Evaluations on benchmark datasets,a real SSS dataset and Data collected at Lake Mulan aestablish Rep DNet as a well-balanced network,meeting the AUV computational constraints in terms of performance and latency. 展开更多
关键词 Side-scan sonar sonar image despeckling Domain knowledge RE-PARAMETERIZATION
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Underwater Gas Leakage Flow Detection and Classification Based on Multibeam Forward-Looking Sonar
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作者 Yuanju Cao Chao Xu +3 位作者 Jianghui Li Tian Zhou Longyue Lin Baowei Chen 《哈尔滨工程大学学报(英文版)》 CSCD 2024年第3期674-687,共14页
The risk of gas leakage due to geological flaws in offshore carbon capture, utilization, and storage, as well as leakage from underwater oil or gas pipelines, highlights the need for underwater gas leakage monitoring ... The risk of gas leakage due to geological flaws in offshore carbon capture, utilization, and storage, as well as leakage from underwater oil or gas pipelines, highlights the need for underwater gas leakage monitoring technology. Remotely operated vehicles(ROVs) and autonomous underwater vehicles(AUVs) are equipped with high-resolution imaging sonar systems that have broad application potential in underwater gas and target detection tasks. However, some bubble clusters are relatively weak scatterers, so detecting and distinguishing them against the seabed reverberation in forward-looking sonar images are challenging. This study uses the dual-tree complex wavelet transform to extract the image features of multibeam forward-looking sonar. Underwater gas leakages with different flows are classified by combining deep learning theory. A pool experiment is designed to simulate gas leakage, where sonar images are obtained for further processing. Results demonstrate that this method can detect and classify underwater gas leakage streams with high classification accuracy. This performance indicates that the method can detect gas leakage from multibeam forward-looking sonar images and has the potential to predict gas leakage flow. 展开更多
关键词 Carbon capture utilization and storage(CCUS) Gas leakage Forward-looking sonar Dual-tree complex wavelet transform(DT-CWT) Deep learning
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如何利用Jenkins与Sonar提升产品内在质量
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作者 单华 《信息产业报道》 2024年第1期39-41,共3页
对于软件工程而言,我们的内外部质量是什么呢?对客户、最终用户、间接用户的需求满足程度即是产品的外部质量。软件的内部质量,即产品架构的合理性,可扩展性,代码的规范性,可读性,简洁度,组件重用等等,这些质量属性往往对客户是不可见... 对于软件工程而言,我们的内外部质量是什么呢?对客户、最终用户、间接用户的需求满足程度即是产品的外部质量。软件的内部质量,即产品架构的合理性,可扩展性,代码的规范性,可读性,简洁度,组件重用等等,这些质量属性往往对客户是不可见的。在公司内对代码的编写要求遵守编码规范,对于设计要求符合基本的设计原则,这些都是软件的内部质量! 展开更多
关键词 质量内建 核心价值 Jenkins sonar 质量分析
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An Underwater Robot Inspection Anomaly Localization Feedback System Based on Sonar Technology
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作者 Siqiang Cheng Yi Liu +1 位作者 Aibin Tang Libin Yang 《Journal of Electronic Research and Application》 2024年第4期17-21,共5页
This article introduces an underwater robot inspection anomaly localization feedback system comprising a real-time water surface tracking,detection,and positioning system located on the water surface,while the underwa... This article introduces an underwater robot inspection anomaly localization feedback system comprising a real-time water surface tracking,detection,and positioning system located on the water surface,while the underwater robot inspection anomaly feedback system is housed within the underwater robot.The system facilitates the issuance of corresponding mechanical responses based on the water surface’s real-time tracking,detection,and positioning,enabling recognition and feedback of anomaly information.Through sonar technology,the underwater robot inspection anomaly feedback system monitors the underwater robot in real-time,triggering responsive actions upon encountering anomalies.The real-time tracking,detection,and positioning system from the water surface identifies abnormal conditions of underwater robots based on changes in sonar images,subsequently notifying personnel for necessary intervention. 展开更多
关键词 Underwater robots Positioning feedback system sonar real-time tracking
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Application Research of Sonar Detection Method in Melting Exploration at the Bottom of Piles
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作者 Tianzhi Liu Ke Tu +2 位作者 Chunsong Duan Qian Chen Liu Hu Yan 《Journal of Architectural Research and Development》 2023年第4期15-25,共11页
Karst landforms are widely distributed in China,and are most common in Yunnan,Guizhou and Guangxi.If the development of karst caves at the bottom of the piles cannot be accurately ascertained before the construction o... Karst landforms are widely distributed in China,and are most common in Yunnan,Guizhou and Guangxi.If the development of karst caves at the bottom of the piles cannot be accurately ascertained before the construction of bridge pile foundations,accidents such as hole collapse,slurry leakage,and drill sticking will easily occur.In this paper,the principle and method of sonar detection for detecting karst caves at the bottom of bridge piles was introduced,and the sonar detection data and the cave situation at the bottom of the pile during the construction process in combination with the case of Yunnan Zhenguo Highway Project was analyzed,which verifies the practicability and reliability of sonar detection method reliability. 展开更多
关键词 Principle of sonar detection method General situation of sonar detection method engineering
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YOLOv5-Based Seabed Sediment Recognition Method for Side-Scan Sonar Imagery 被引量:1
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作者 WANG Ziwei HU Yi +1 位作者 DING Jianxiang SHI Peng 《Journal of Ocean University of China》 SCIE CAS CSCD 2023年第6期1529-1540,共12页
Seabed sediment recognition is vital for the exploitation of marine resources.Side-scan sonar(SSS)is an excellent tool for acquiring the imagery of seafloor topography.Combined with ocean surface sampling,it provides ... Seabed sediment recognition is vital for the exploitation of marine resources.Side-scan sonar(SSS)is an excellent tool for acquiring the imagery of seafloor topography.Combined with ocean surface sampling,it provides detailed and accurate images of marine substrate features.Most of the processing of SSS imagery works around limited sampling stations and requires manual interpretation to complete the classification of seabed sediment imagery.In complex sea areas,with manual interpretation,small targets are often lost due to a large amount of information.To date,studies related to the automatic recognition of seabed sediments are still few.This paper proposes a seabed sediment recognition method based on You Only Look Once version 5 and SSS imagery to perform real-time sedi-ment classification and localization for accuracy,particularly on small targets and faster speeds.We used methods such as changing the dataset size,epoch,and optimizer and adding multiscale training to overcome the challenges of having a small sample and a low accuracy.With these methods,we improved the results on mean average precision by 8.98%and F1 score by 11.12%compared with the original method.In addition,the detection speed was approximately 100 frames per second,which is faster than that of previous methods.This speed enabled us to achieve real-time seabed sediment recognition from SSS imagery. 展开更多
关键词 seabed sediment real-time target recognition YOLOv5 model side-scan sonar imagery transfer learning
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Improving Yolo5 for Real-Time Detection of Small Targets in Side Scan Sonar Images
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作者 WANG Jianjun WANG Qi +2 位作者 GAO Guocheng QIN Ping HE Bo 《Journal of Ocean University of China》 SCIE CAS CSCD 2023年第6期1551-1562,共12页
Side scan sonar(SSS)is an important means to detect and locate seafloor targets.Autonomous underwater vehicles(AUVs)carrying SSS stay near the seafloor to obtain high-resolution images and provide the outline of the t... Side scan sonar(SSS)is an important means to detect and locate seafloor targets.Autonomous underwater vehicles(AUVs)carrying SSS stay near the seafloor to obtain high-resolution images and provide the outline of the target for observers.The target feature information of an SSS image is similar to the background information,and a small target has less pixel information;therefore,accu-rately identifying and locating small targets in SSS images is challenging.We collect the SSS images of iron metal balls(with a diameter of 1m)and rocks to solve the problem of target misclassification.Thus,the dataset contains two types of targets,namely,‘ball’and‘rock’.With the aim to enable AUVs to accurately and automatically identify small underwater targets in SSS images,this study designs a multisize parallel convolution module embedded in state-of-the-art Yolo5.An attention mechanism transformer and a convolutional block attention module are also introduced to compare their contributions to small target detection accuracy.The performance of the proposed method is further evaluated by taking the lightweight networks Mobilenet3 and Shufflenet2 as the backbone network of Yolo5.This study focuses on the performance of convolutional neural networks for the detection of small targets in SSS images,while another comparison experiment is carried out using traditional HOG+SVM to highlight the neural network’s ability.This study aims to improve the detection accuracy while ensuring the model efficiency to meet the real-time working requirements of AUV target detection. 展开更多
关键词 side scan sonar images autonomous underwater vehicle multisize parallel convolution module attention mechanism
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Fast Segmentation Method of Sonar Images for Jacket Installation Environment
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作者 Hande Mao Hongzhe Yan +4 位作者 Lei Lin Wentao Dong Yuhang Li Yuliang Liu Jing Xue 《Intelligent Automation & Soft Computing》 SCIE 2023年第5期1671-1686,共16页
It has remained a hard nut for years to segment sonar images of jacket installation environment,most of which are noisy images with inevitable blur after noise reduction.For the purpose of solutions to this problem,a ... It has remained a hard nut for years to segment sonar images of jacket installation environment,most of which are noisy images with inevitable blur after noise reduction.For the purpose of solutions to this problem,a fast segmen-tation algorithm is proposed on the basis of the gray value characteristics of sonar images.This algorithm is endowed with the advantage in no need of segmentation thresholds.To realize this goal,we follow the undermentioned steps:first,calcu-late the gray matrix of the fuzzy image background.After adjusting the gray value,the image is divided into three regions:background region,buffer region and target regions.Afterfiltering,we reset the pixels with gray value lower than 255 to binarize images and eliminate most artifacts.Finally,the remaining noise is removed by morphological processing.The simulation results of several sonar images show that the algorithm can segment the fuzzy sonar images quickly and effectively.Thus,the stable and feasible method is testified. 展开更多
关键词 Image segmentation sonar image ocean engineering morphological image
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Motion estimation in wide band synthetic aperture sonar based on the raw echo data using the method of displaced phase center antenna 被引量:3
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作者 JIANG Xiaokui, SUN Chao (Member, IEEE), FANG Jie (Institute of Acoustic Engineering, Northwestern Polytechnical University, Xi’an 710072, China) 《声学技术》 CSCD 2003年第z1期56-59,共4页
Phase errors in synthetic aperture sonar (SAS) imaging must be reduced to less than one eighth of a wavelength so as to avoid image destruction. Most of the phase errors occur as a result of platform motion errors, fo... Phase errors in synthetic aperture sonar (SAS) imaging must be reduced to less than one eighth of a wavelength so as to avoid image destruction. Most of the phase errors occur as a result of platform motion errors, for example, sway yaw and surge that are the most important error sources. The phase error of a wide band synthetic aperture sonar is modeled and solutions to sway yaw and surge motion estimation based on the raw sonar echo data with a Displaced Phase Center Antenna (DPCA) method are proposed and their implementations are detailed in this paper. It is shown that the sway estimates can be obtained from the correlation lag and phase difference between the returns at coincident phase centers. An estimate of yaw is also possible if such a technique is applied to more than one overlapping phase center positions. Surge estimates can be obtained by identifying pairs of phase centers with a maximum correlation coefficient. The method works only if the platform velocity is low enough such that a number of phase centers from adjacent pings overlap. 展开更多
关键词 sonar SYNTHETIC APERTURE sonar (SAS) motion estimation RAW data DPCA.
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Underwater Terrain-Aided Navigation Based on Multibeam Bathymetric Sonar Images 被引量:2
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作者 Ziqi Song Hongyu Bian Adam Zielinski 《Journal of Marine Science and Application》 CSCD 2015年第4期425-433,共9页
Underwater terrain-aided navigation is used to complement the traditional inertial navigation employed by autonomous underwater vehicles during lengthy missions. It can provide fixed estimations by matching real-time ... Underwater terrain-aided navigation is used to complement the traditional inertial navigation employed by autonomous underwater vehicles during lengthy missions. It can provide fixed estimations by matching real-time depth data with a digital terrain map, This study presents the concept of using image processing techniques in the underwater terrain matching process. A traditional gray-scale histogram of an image is enriched by incorporation with spatial information in pixels. Edge comer pixels are then defined and used to construct an edge comer histogram, which employs as a template to scan the digital terrain map and estimate the fixes of the vehicle by searching the correlation peak. Simulations are performed to investigate the robustness of the proposed method, particularly in relation to its sensitivity to background noise, the scale of real-time images, and the travel direction of the vehicle. At an image resolution of 1 m2/pixel, the accuracy of localization is more than 10 meters. 展开更多
关键词 underwater acoustics terrain-aided navigation sonar images HISTOGRAM autonomous underwater vehicle multibeam bathymetric sonar
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Research of New Concept Sonar—Cognitive Sonar 被引量:2
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作者 李晓花 李亚安 +1 位作者 崔琳 刘望生 《Journal of Marine Science and Application》 2011年第4期502-509,共8页
The performance of a sonar system is closely related to the marine environment and the target characteristics. When dealing with the echoes of a traditional active sonar system, the sonar designers often do not take i... The performance of a sonar system is closely related to the marine environment and the target characteristics. When dealing with the echoes of a traditional active sonar system, the sonar designers often do not take into account the influence of the environmental information and prior knowledge perceived by sonar receivers, making it difficult to obtain desired processing results. Based on the basic principle and key technology of sonar, this paper proposed a cognition-based intelligent sonar system in theory--cognitive sonar. Cognitive sonar is capable of jointly optimizing the transmission waveform and receiver according to the changes of environment so that its detection and identification performance can be significantly improved. 展开更多
关键词 sonar COGNITION bat echolocation cognitive sonar
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High-resolution swath bathymetry using MIMO sonar system 被引量:1
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作者 Xionghou Liu Chao Sun +2 位作者 Jie Zhuo Feng Yi Zongwei Liu 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2014年第5期761-768,共8页
For increasing the cross-track resolution, the multiple input multiple output (MIMO) technique is introduced into the swath bathymetry system and a new swath bathymetry approach using MIMO sonar is proposed. The MIM... For increasing the cross-track resolution, the multiple input multiple output (MIMO) technique is introduced into the swath bathymetry system and a new swath bathymetry approach using MIMO sonar is proposed. The MIMO sonar is composed of two parallel transmitting uniform linear arrays (ULAs) and a receiving ULA which is perpendicular to the former. The spacing between the two transmitting ULAs is equal to the product of the receiving sensor number and the receiving inter-sensor spacing. Furthermore, two narrowband linear frequency modulation (LFM) pulses, sharing the same frequency band but with opposite modulation slopes, are used as transmitting waveforms of the two transmitting ULAs. With such an array layout and transmitting signals, the MIMO sonar can sound a swath with the cross-track resolution doubling that of the traditional multibeam sonar using a Mills cross array. Numerical examples are provided to verify the effectiveness of the proposed approach. 展开更多
关键词 BATHYMETRY multibeam sonar multiple input multipleoutput (MIMO) sonar waveform diversity.
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Seafloor Sediment Classification Based on Multibeam Sonar Data 被引量:1
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作者 ZHOUXinghua CHENYongqi 《Geo-Spatial Information Science》 2004年第4期290-296,共7页
The multibeam sonars can provide hydrographic quality depth data as well as hold the potential to provide calibrated measurements of the seafloor acoustic backscattering strength. There has been much interest in utili... The multibeam sonars can provide hydrographic quality depth data as well as hold the potential to provide calibrated measurements of the seafloor acoustic backscattering strength. There has been much interest in utilizing backscatters and images from multibeam sonar for seabed type identification and most results are obtained. This paper has presented a focused review of several main methods and recent developments of seafloor classification utilizing multibeam sonar data or/and images. These are including the power spectral analysis methods, the texture analysis, traditional Bayesian classification theory and the most active neural network approaches. 展开更多
关键词 seafloor classification multibeam sonar backscattering strength sonarimages
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Bionic covert anti-reverberation active sonar detection method based on imitating whale whistles 被引量:1
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作者 JIANG Jiajia MIAO Yu +5 位作者 LI Yao SUN Zhongbo LI Chunyue WANG Xianquan FU Xiao DUAN Fajie 《Journal of Measurement Science and Instrumentation》 CAS CSCD 2022年第2期127-137,共11页
The disguised covert detection method that imitates whale calls has received great attention in recent years because it can solve the traditional problem of the trade-off between long-range detection and covert detect... The disguised covert detection method that imitates whale calls has received great attention in recent years because it can solve the traditional problem of the trade-off between long-range detection and covert detection.However,under strong reverberation conditions,traditional echo signal processing methods based on matched filtering will be greatly disturbed.Based on this,a disguised sonar signal waveform design is proposed based on imitating whale calls and computationally efficient anti-reverberation echo signal processing method.Firstly,this article proposed a disguised sonar signal waveform design method based on imitating whale calls.This method uses linear frequency modulation(LFM)signals to replace LFM-like segments in real whale calls,and extracts the envelope of the real whale call’s LFM-like segment to modify the LFM signal.Secondly,this article proposed an echo signal processing method of fractional Fourier transform(FrFT)based on target echo locating of synchronization signals.This method uses the synchronization signal to locate the target echo,and determines the step-size interval of the FrFT based on the information carried by the synchronization signal.Compared with the traditional FrFT,this method effectively reduces the amount of calculation and also improves the anti-reverberation ability.Finally,the excellent performance of the proposed method is verified by simulation results. 展开更多
关键词 active sonar system anti-reverberation disguised sonar waveform design echo signal processing
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Multi-beam Sonar and Side-scan Sonar Image Co-registering and Fusing
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作者 阳凡林 刘经南 赵建虎 《Marine Science Bulletin》 CAS 2003年第1期16-23,共8页
Multi-beam Sonar and Side-scan Sonar compensate each other. In order to fully utilize all information, it is necessary to fuse two kinds of image and data. And the image co-registration is an important and complicated... Multi-beam Sonar and Side-scan Sonar compensate each other. In order to fully utilize all information, it is necessary to fuse two kinds of image and data. And the image co-registration is an important and complicated job before fusion. This paper suggests combining bathymetric data with intensity image, obtaining the characteristic points through the minimal angles of lines, and then deciding the corresponding image points by the maximal correlate coefficient in searching space. Finally, the second order polynomial is applied to the deformation model. After the images have been co-registered, Wavelet is used to fuse the images. It is shown that this algorithm can be used in the flat seafloor or the isotropic seabed. Verification is made in the paper with the observed data. 展开更多
关键词 Multi-beam sonar Side-scan sonar Co-registering FUSION
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Waveform diversity based sonar system for target localization 被引量:6
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作者 Lijie Zhang dianguo Huang +3 位作者 Yong Jin Yunshan Hou Min Jiang Qunfei Zhang 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2010年第2期186-190,共5页
A new monostatic array system taking advantage of diverse waveforms to improve the performance of underwater tar- get localization is proposed. Unlike the coherent signals between different elements in common active a... A new monostatic array system taking advantage of diverse waveforms to improve the performance of underwater tar- get localization is proposed. Unlike the coherent signals between different elements in common active array, the transmitted signals from different elements here are spatially orthogonal waveforms which allow for array processing in the transit mode and result in an extension of array aperture. The mathematical derivation of Capon estimator for this sonar system is described in detail. And the performance of this orthogonal-waveform based sonar is an- alyzed and compared with that of its phased-array counterpart by water tank experiments. Experimental results show that this sonar system could achieve 12 dB-15 dB additional array gain over its phased-array counterpart, which means a doubling of maximum detection range. Moreover, the angular resolution is significantly improved at lower SNR. 展开更多
关键词 sonar orthogonal signal transmission CAPON target localization.
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Fast DOA estimation algorithm for MIMO sonar based on ant colony optimization 被引量:4
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作者 Wentao Shi Jianguo Huang Yunshan Hou 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2012年第2期173-178,共6页
The maximum likelihood (ML) estimator demonstrates remarkable performance in direction of arrival (DOA) estimation for the multiple input multiple output (MIMO) sonar. However, this advantage comes with prohibit... The maximum likelihood (ML) estimator demonstrates remarkable performance in direction of arrival (DOA) estimation for the multiple input multiple output (MIMO) sonar. However, this advantage comes with prohibitive computational complexity. In order to solve this problem, an ant colony optimization (ACO) is incorporated into the MIMO ML DOA estimator. Based on the ACO, a novel MIMO ML DOA estimator named the MIMO ACO ML (ML DOA estimator based on ACO for MIMO sonar) with even lower computational complexity is proposed. By extending the pheromone remaining process to the pheromone Gaussian kernel probability distribution function in the continuous space, the pro- posed algorithm achieves the global optimum value of the MIMO ML DOA estimator. Simulations and experimental results show that the computational cost of MIMO ACO ML is only 1/6 of the MIMO ML algorithm, while maintaining similar performance with the MIMO ML method. 展开更多
关键词 multiple input multiple output (MIMO) sonar ant colonyoptimization (ACO) maximum likelihood (ML) direction of arrival(DOA) computational complexity.
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Compensation for diffusion loss of sound wave in sonar system
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作者 徐琳 王润田 《Journal of Measurement Science and Instrumentation》 CAS CSCD 2016年第1期54-58,共5页
Sound pressure amplitude will be attenuated with propagation distance in a certain rule when sound wave is propagated in shallow sea.When processing the attenuated signal,time-variant gain circuit is usually used to c... Sound pressure amplitude will be attenuated with propagation distance in a certain rule when sound wave is propagated in shallow sea.When processing the attenuated signal,time-variant gain circuit is usually used to compensate its diffusion loss.In this paper,spherical diffusion loss is compensated by digital potentiometer and operational circuit and further investigation is also made on compensation of cylindrical diffusion loss and transition from spherical diffusion loss to cylindrical diffusion loss.Finally,a new compensation model is proposed for unknown propagation loss for the purpose of adjusting the dynamic range of signal to meet the requirement of A/D conversion. 展开更多
关键词 diffusion loss time-variant gain DIGITIZATION sonar system
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代码质量管理平台Sonar在软件项目管理中的应用研究 被引量:2
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作者 戚华 杨铭 《电子技术与软件工程》 2016年第6期68-69,共2页
文中对代码质量管理平台Sonar的质量评估模型和技术优势进行了深入剖析和解读,介绍了将Sonar平台在软件项目管理中的意义和价值。从多个角度阐述了代码质量管理对软件产品质量的重要性,并通实际项目导入的数据比对分析展示了该平台对实... 文中对代码质量管理平台Sonar的质量评估模型和技术优势进行了深入剖析和解读,介绍了将Sonar平台在软件项目管理中的意义和价值。从多个角度阐述了代码质量管理对软件产品质量的重要性,并通实际项目导入的数据比对分析展示了该平台对实现企业软件项目管理中的代码质量透明化的重大意义。 展开更多
关键词 软件质量保证 代码质量管理 sonar 持续集成
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