1、INTERNATIONAL STANDARD IEC 62238 First edition 2003-03 Maritime navigation and radiocommunication equipment and systems VHF radiotelephone equipment incorporating Class “D“ Digital Selective Calling (DSC) Methods of testing and required test results Reference number IEC 62238:2003(E)Publication numb
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8、e: Email: custserviec.ch Tel: +41 22 919 02 11 Fax: +41 22 919 03 00INTERNATIONAL STANDARD IEC 62238 First edition 2003-03 Maritime navigation and radiocommunication equipment and systems VHF radiotelephone equipment incorporating Class “D“ Digital Selective Calling (DSC) Methods of testing and requ
9、ired test results IEC 2003 Copyright - all rights reserved No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Electrotechnical Commissio
10、n, 3, rue de Varemb, PO Box 131, CH-1211 Geneva 20, Switzerland Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmailiec.ch Web: www.iec.ch V For price, see current catalogue PRICE CODE Commission Electrotechnique Internationale International Electrotechnical Commission 2 62238 IEC:20
11、03(E) CONTENTS FOREWORD 5 INTRODUCTION 6 1 Scope 7 2 Normative references. 7 3 Terms, definitions and abbreviations 8 3.1 Definitions 8 3.2 Abbreviations 9 4 General and operational requirements . 9 4.1 General 9 4.2 Composition . 9 4.3 Construction . 9 4.4 Controls and indicators10 4.5 Facilities f
12、or coding and decoding of DSC11 4.6 DSC display.12 4.7 Handset and loudspeaker 13 4.8 Safety precautions.13 4.9 Labelling13 4.10 Warm up14 5 Technical requirements.14 5.1 Switching time .14 5.2 Class of emission and modulation characteristics 14 5.3 Facilities for DSC transmission and reception14 5.
13、4 Ships identity MMSI and Group MMSI.15 5.5 Entry of position information 15 5.6 Alarm circuits for incoming calls.15 5.7 Multiple watch facilities16 5.8 Built-in test 17 6 General conditions of measurement17 6.1 Arrangements for test signals applied to the receiver input 17 6.2 Squelch .17 6.3 Norm
14、al test modulation17 6.4 Artificial antenna18 6.5 Arrangements for test signals applied to the transmitter input 18 6.6 Test channels 18 6.7 Generation and examination of the digital selective call signal.18 6.8 Standard test signals for DSC18 6.9 Determination of the symbol error ratio in the outpu
15、t of the receiving part18 6.10 Measurement uncertainty and interpretation of the measured results.19 6.11 Test conditions, power sources, and ambient temperatures .19 6.12 Normal test conditions .20 6.13 Extreme test conditions .20 6.14 Procedure for tests at extreme temperatures .2162238 IEC:2003(E
16、) 3 7 Environmental tests 21 7.1 Introduction .21 7.2 Procedure21 7.3 Performance check21 7.4 Vibration test .21 7.5 Temperature tests .21 8 Transmitter .22 8.1 Frequency error.22 8.2 Carrier power.22 8.3 Frequency deviation 23 8.4 Sensitivity of the modulator, including microphone.24 8.5 Audiofrequ
17、ency response 24 8.6 Audiofrequency harmonic distortion of the emission.24 8.7 Adjacent channel power.25 8.8 Conducted spurious emissions conveyed to the antenna .25 8.9 Transient frequency behaviour of the transmitter .26 8.10 Residual modulation of the transmitter.28 8.11 Frequency error (DSC sign
18、al) 28 8.12 Modulation index for DSC 29 8.13 Modulation rate for DSC 29 8.14 Testing of generated call sequences29 9 Radiotelephone receiver .30 9.1 Harmonic distortion and rated audiofrequency output power 30 9.2 Audiofrequency response 30 9.3 Maximum usable sensitivity .31 9.4 Co-channel rejection
19、32 9.5 Adjacent channel selectivity.32 9.6 Spurious response rejection 33 9.7 Intermodulation response 33 9.8 Blocking or desensitization 34 9.9 Spurious emissions34 9.10 Receiver residual noise level .35 9.11 Squelch operation35 9.12 Squelch hysteresis 36 9.13 Multiple watch characteristic36 10 Rec
20、eiver for DSC decoder 37 10.1 Maximum usable sensitivity .37 10.2 Co-channel rejection38 10.3 Adjacent channel selectivity.38 10.4 Spurious response and blocking immunity .39 10.5 Intermodulation response 39 10.6 Dynamic range 40 10.7 Spurious emissions40 10.8 Verification of correct decoding of var
21、ious types of DSC calls40 10.9 Reaction to VTS and AIS channel management DSC transmissions 41 10.10Simultaneous reception .41 11 Electromagnetic compatibility42 4 62238 IEC:2003(E) Annex A (normative) DSC Calls48 Annex B (normative) Power measuring receiver specification.49 B.1 IF filter .49 B.2 At
22、tenuation indicator 50 B.3 RMS value indicator.50 B.4 Oscillator and amplifier 50 Annex C (informative) Summary of major differences of this standard from existing regional standards 51 C.1 European Standard EN 301 025.51 C.2 American Standard RTCM Special Committee No 101 .51 Annex D (informative)
23、Recommended standards for equipment operating in high level electromagnetic environments.52 D.1 Introduction52 D.2 Method of measurement.52 D.3 Limits.53 Annex E (informative) International VHF marine radio channels and frequencies .54 Annex F (informative) U.S. VHF marine radio channels and frequen
24、cies 57 Annex G (informative) CANADIAN VHF marine radio channels and frequencies.59 Figure 1 Frequency deviation .43 Figure 2 Audiofrequency response .44 Figure 3 Test set-up for measuring transient frequency behaviour45 Figure 4 Storage oscilloscope view t 1 , t 2and t 3 46 Figure 5 Receiver audiof
25、requency response.47 Figure B.1 IF filter specification49 Figure D.1 Method of measurement5262238 IEC:2003(E) 5 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ MARITIME NAVIGATION AND RADIOCOMMUNICATION EQUIPMENT AND SYSTEMS VHF radiotelephone equipment incorporatingClass “D” Digital Selective Calling (
26、DSC) Methods of testing and required test results FOREWORD 1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote international co-operat
27、ion on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, the IEC publishes International Standards. Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
28、 may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. The IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by
29、 agreement between the two organizations. 2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested National Committees. 3)
30、 The documents produced have the form of recommendations for international use and are published in the form of standards, technical specifications, technical reports or guides and they are accepted by the National Committees in that sense. 4) In order to promote international unification, IEC Natio
31、nal Committees undertake to apply IEC International Standards transparently to the maximum extent possible in their national and regional standards. Any divergence between the IEC Standard and the corresponding national or regional standard shall be clearly indicated in the latter. 5) The IEC provid
32、es no marking procedure to indicate its approval and cannot be rendered responsible for any equipment declared to be in conformity with one of its standards. 6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of patent rights. The IEC
33、 shall not be held responsible for identifying any or all such patent rights. International Standard IEC 62238 has been prepared by IEC technical committee 80: Maritime navigation and radiocommunication equipment and systems. The text of this standard is based on the following documents: FDIS Report
34、 on voting 80/352/FDIS 80/359/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. The committee has decided that the contents of th
35、is publication will remain unchanged until 2005. At this date, the publication will be reconfirmed; withdrawn; replaced by a revised edition, or amended. A bilingual version of this publication may be issued at a later date. 6 62238 IEC:2003(E) INTRODUCTION Equipment designed to this International S
36、tandard is intended to provide compatibility with the Global Maritime Distress and Safety System (GMDSS) for fitting to vessels to which the International Convention on the Safety of Life at Sea (SOLAS) 1974 does not apply. Such vessels are typically small commercial vessels, pleasure vessels, fishi
37、ng vessels, etc. The equipment does not meet all the requirements of the International Maritime Organization (IMO) for SOLAS vessels. However, it does meet the IMO guidelines for non-SOLAS vessels in that it is capable of maintaining a listening watch on VHF channel 16 simultaneously with a watch on
38、 DSC channel 70. The equipment is further capable of both transmitting and receiving distress alerts by DSC on channel 70, thus providing for the safety of own ship together with the ability to assist other ships in distress. The emphasis in this standard is on simplicity of operation. The VHF equip
39、ment uses DSC controllers based on Class D, which will probably be integrated in the VHF radio equipment but in any event will have the capability to select the radio channels automatically. An input for position information in IEC 61162-1 format is a requirement and the use of automatic position up
40、dating is to be encouraged. Distress calls may only be made by means of a protected dedicated button. Furthermore, channel 16 is required to be selected automatically after transmission of a distress or urgency call. Position is included in the distress call either through being entered manually or
41、with an internal GPS or an external GPS. Moreover, a DSC expansion sentence is sent after a distress alert to enhance the position resolution to better than 1 nautical mile. Routine calls require only the input of the called MMSI and a channel number in the case of a ship to ship call. For incoming
42、calls, the radio should be easily configured by the operator to either select automatically or manually the channel number given in the message. Means are provided for the user to enter a temporary group MMSI to permit calling amongst a group of related vessels. The intended aim of designers of equi
43、pment to this international standard is that it should take no longer than 10 min for an operator to learn to use the equipment. This is achieved by the provision of clear simple menus with the most frequently used functions at the top of the menu tree. As an aid to safety, it is a requirement, in o
44、rder to prevent the transmission of DSC calls from an unidentifiable ship, that DSC operation is inhibited on a new equipment until the vessels own MMSI has been entered. Equipment designed to this standard is fitted with a 50 external antenna socket or connector for use on board vessels and operate
45、s in the bands between 156 MHz and 174 MHz allocated to the maritime mobile service. Equipment designed to this standard will not necessarily have exposed metal work which is isolated from the power supply. Earthing exposed metal work may cause a terminal of the source of electrical energy to be ear
46、thed.62238 IEC:2003(E) 7 MARITIME NAVIGATION AND RADIOCOMMUNICATION EQUIPMENT AND SYSTEMS VHF radiotelephone equipment incorporatingClass “D” Digital Selective Calling (DSC) Methods of testing and required test results 1 Scope This International Standard covers the minimum requirements for general c
47、ommunication for shipborne fixed installations using a VHF radiotelephone incorporating class “D” Digital Selective Calling. These requirements include the relevant provisions of the ITU Radio Regulations, ITU-R Recommendations M.493-10 where class D is defined, and incorporate the relevant guidelin
48、es of the IMO as detailed in MSC/Circ. 803, MSC/Circ. 862 and Resolution MSC.131(75). This standard also specifies technical characteristics, methods of measurement and required test results. Recommended standards for equipment intended to work in high level electromagnetic environments are describe
49、d and included in annex D. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60945, Maritime navigation and radiocommunication equipment and systems General requirements Methods of testing and required test resul
