D. Amblas, J. Mora, X. Rayo, A. G. Villafranca, Enrique García-Berro Montilla, M. Canals
{"title":"Real-time lossless compression of multibeam echosounder water column data","authors":"D. Amblas, J. Mora, X. Rayo, A. G. Villafranca, Enrique García-Berro Montilla, M. Canals","doi":"10.17863/CAM.7908","DOIUrl":"https://doi.org/10.17863/CAM.7908","url":null,"abstract":"Multibeam echosounders can generate vast amounts of data when recording \u0000the complete water column, which poses logistic, economic and technical \u0000challenges. Lossy data compression can reduce data size up to one or two orders of \u0000magnitude, but often at the expense of significant image distortion. Lossless compression \u0000ratios tend to be modest and at a high computing cost. In this work we \u0000test a high-performance data compression algorithm, FAPEC, initially developed \u0000for Space data communications with low computing requirements. FAPEC provides \u0000good compression ratios and supports tailored pre-processing stages. Here we \u0000show its advantages over standard and high-end lossless compression solutions \u0000currently available, both in terms of ratios and speed.","PeriodicalId":196404,"journal":{"name":"Instrumentation viewpoint","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129918254","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Benadí, F. J. Muñoz, Joaquín del Río Fernandez, A. Lázaro
{"title":"Good Practice Guide for calibrating a hydrophone \"in situ\"","authors":"A. Benadí, F. J. Muñoz, Joaquín del Río Fernandez, A. Lázaro","doi":"10.21014/ACTA_IMEKO.V4I1.157","DOIUrl":"https://doi.org/10.21014/ACTA_IMEKO.V4I1.157","url":null,"abstract":"The aim of this paper is to provide the basis for the calibration of a hydrophone \"in situ\", thus assigning a value of uncertainty, which may be high, but according to requirements may be sufficient.","PeriodicalId":196404,"journal":{"name":"Instrumentation viewpoint","volume":"574 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114938415","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Architecture of the multi-tap-delay-line time-interval measurement module implemented in FPGA device","authors":"Marek Zielinsk, M. Gurski, D. Chaberski","doi":"10.21014/ACTA_IMEKO.V4I1.167","DOIUrl":"https://doi.org/10.21014/ACTA_IMEKO.V4I1.167","url":null,"abstract":"This paper describes the architecture of a Multi‐Tap‐Delay‐Line (MTDL) time‐interval measurement module of high resolution implemented in a single FPGA device. The new architecture of the measurement module enables to collect sixteen time‐stamps during a single measuring cycle. It means that the measured time‐interval can be precisely interpolated from the collection of the sixteen time‐stamps after each measuring cycle. Such architecture of the measurement module leads directly to an increased resolution, to a limited total measurement time and a decreased duty cycle of the measurement instrument.","PeriodicalId":196404,"journal":{"name":"Instrumentation viewpoint","volume":"107 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122429483","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"DSP based data acquisition system with on-board processing","authors":"Pedro M.Pinto, P. Ramos","doi":"10.21014/ACTA_IMEKO.V4I1.156","DOIUrl":"https://doi.org/10.21014/ACTA_IMEKO.V4I1.156","url":null,"abstract":"This paper presents the development, implementation and characterization of a data acquisition (DAQ) system capable of on-board processing the acquired data. The system features four differential channels, with 1 MHz bandwidth, simultaneous acquisition, 9 independent bipolar ranges, and a maximum sampling rate of 600 kS/s. The analog DAQ inputs are protected against incorrect connections even direct connection to the power grid voltage. This protection ensures that the DAQ can recover to full operation without the need to replace any damaged components or fuses. A 450 MHz SHARC digital signal processor (ADSP 21489) is used to control the system and perform on-board processing. Interface between the system and a personal computer is through a USB Hi‑speed connection.","PeriodicalId":196404,"journal":{"name":"Instrumentation viewpoint","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127669940","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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