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• W2058858402 abstract "ABSTRACT This paper overviews firstly historical developments in marine navigation and positioning technology, secondly reviews in perspective the integration of navigation systems and concludes with an overview of the development of the electronic chart that in retrospect has passed from infancy to the state-of-the-art in less than eight years. Today's navigators have access to positional data obtained from various radio systems such as low frequency Loran-C, Decca Navigator, and Omega, medium frequency systems typically ARGO or Hyper-Fix, ultra-high frequency systems as exampled by SERCEL Syledis and Del Norte's UHF Trisponder and microwave systems like Mini-Ranger, Trisponder and Micro-Fix. Other conventional navaids include long and short base line acoustics, the Navistar GPS and Transit Doppler satellite systems while numerous on-board sensors may include radar, RDF, depth sounder, Doppler log and gyrocompass. Consequently, the navigator is being provided with an abundance of navigational data of varying accuracy, range and resolution that he must mentally filter in terms of repeatability, reliability and relevance then subsequently transfer to a paper chart. Despite technological advances in all these electronic aids-to-navigation, the recording and plotting of these data has evolved slowly from the conventional hand plot to today's microprocessor based systems. Today, precise filtered and integrated positional data can be overlayed on an electronic chart, stored in memory and displayed on a high speed, high resolution, colour monitor with true and relative motion capability incorporating variable survey chart scales (l). Multiple output options provide on-line data presentation on printers, plotters and RGB monitors. HISTORICAL INTRODUCTION Many of today's modern navigational and positioning systems used at sea relate historically to the associated developments in radio wave propagation which began with Maxwell's studies in 1865. A cursory overview of those discoveries pertinent to the development of the electronic chart are as follows(2):1887 Hertz radio aerial invention1893 Thompson's waveguide theory1912 Eccles' radio-atmospheric transmission1915 Various countries development of radio-direction finding (RDF)1916 Royal Navy's Sonar (Asdic) and hydrophones1918 Watson's radio ground wave propagation1926 Yagi's directional radio aerial1930 Lilienfield MOS/FET Transistor1944 Decca's Main Chain1952 Loran radio navigational system1960's U.S. Federal Government began collecting digital cartographic data1964 U.S. Navy's Transit navigational satellites (NNSS)1968 U.S. Navy and Sperry developed HICANS1976 U.S. Navy, U.S. Coast Guard and Sperry developed Command Display and Control System COMDAC1979 OSPS' PNS electronic chart systems development1980's Defense Mapping Agency Automated Notice to Mariners System ANMS1980 U.S. Navy's and Hughes developed their Submarine Advanced Combat System SUBACS and Plotter and Combat Systems Display PACS1981 Automatic radar plotting aids ARPA The first electronic chart workshop was held in Fredericton, N.B. in 1982i the second in Baltimore, MD in 1983 and in September 1984 electronic charts were discussed in the international community at Plymouth, England at the International Hydrographic Technical Conference. Three IHO groups are now involved with studies related to electronic charts: The Committee in the Exchange of Digital Data, the subcommittee on Future Chart Design and the Elec" @default.
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• W2058858402 date "1986-05-05" @default.
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• W2058858402 title "Precise Integrated Navigation Systems And The Development Of The Electronic Chart" @default.
• W2058858402 doi "https://doi.org/10.4043/5196-ms" @default.
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