ITU-R QUESTION 985-1990 Transmission of digital data for the updating of electronic chart display systems《数字数据传输在电子海图显示系统更新中的应用》.pdf

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1、QUESTION ITU-R 98/5*,*Transmission of digital data for the updating ofelectronic chart display systems(1990)The ITU Radiocommunication Assembly,consideringa) the Maritime Safety Committee of the International Maritime Organization (IMO) hasapproved Provisional Performance Standards for Electronic Ch

2、art Display Systems (ECDIS) at itsfifty-seventh session (1989);b) the IMO has invited the ITU-R to undertake a technical study of the most appropriatesystem and data medium which should be used for transmission of updating information to shipsusing satellite and terrestrial techniques and to recomme

3、nd the most appropriate methods for suchtransmissions;c) the present method of updating paper charts consists of the weekly mailing of printed datawhich contain numerous single feature corrections and small sections of charts that are compiled bynational Hydrographic Offices, and which the mariner m

4、anually applies to paper charts;d) the existence of ECDIS offers the opportunity to obtain the timely automatic updating ofthe Electronic Navigation Chart (ENC) by supplying Hydrographic Office produced digital data viaterrestrial or satellite telecommunications to ships at sea or in port;e) the tec

5、hnology of ECDIS offers the additional opportunity to work toward the broadcast ofthose Radio Navigational Warnings that apply specifically to items normally associated with charts,resulting in the automatic display of those warnings,decides that the following Questions should be studied1 What syste

6、m, or combination of systems, should be employed for the transmission ofHydrographic Office produced ENC update information to ships at sea or in port throughout theworld?2 What are the comparative advantages (access, reliability, cost, etc.) of satellite and/orterrestrial systems for the broadcast

7、or interactive selective distribution of Hydrographic Officeproduced digital update files?3 What technical standards and operational procedures should be used to allow for automaticdisplay on ECDIS of those chart-related Radio Navigational Warnings to be transmitted over radiosystems?4 What operatio

8、nal procedures and coding techniques are recommended to assure theaccuracy of digital data received by ECDIS?_* This Question should be brought to the attention of the International Maritime Organization (IMO),International Hydrographic Organization (IHO) and International Electrotechnic Committee (IEC).* Former Question ITU-R 98/8.