1、BSI Standards PublicationBS ISO 22090-2:2014Ships and marine technology Transmitting headingdevices (THDs)Part 2: Geomagnetic principlesBS ISO 22090-2:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 22090-2:2014.It supersedes BS ISO 22090-2:2004 which is w
2、ithdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee EPL/80, Maritime navigation and radiocommunicationequipment and systems.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include a
3、ll the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2014. Published by BSI StandardsLimited 2014ISBN 978 0 580 79394 3ICS 47.020.70Compliance with a British Standard cannot confer immunity fromlegal obligations.This British St
4、andard was published under the authority of theStandards Policy and Strategy Committee on 31 March 2014.Amendments issued since publicationDate T e x t a f f e c t e dBS ISO 22090-2:2014 ISO 2014Ships and marine technology Transmitting heading devices (THDs) Part 2: Geomagnetic principlesNavires et
5、technologie maritime Dispositifs de transmission de donnes de pilotage Partie 2: Principes gomagntiquesINTERNATIONAL STANDARDISO22090-2Second edition2014-03-01Reference numberISO 22090-2:2014(E)BS ISO 22090-2:2014ISO 22090-2:2014(E)ii ISO 2014 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2014
6、All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested
7、 from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 22090-2:2014ISO 22090-2:2014(E) ISO 2014 All
8、rights reserved iiiContents PageForeword iv1 Scope . 12 Normative references 13 Terms and definitions . 24 Performance requirements . 34.1 Functionality . 34.2 Information 34.3 Fore-and-aft mark 44.4 Heading information 44.5 Electrical wiring . 44.6 Non-magnetic housing . 44.7 Alert signal 44.8 Inte
9、rface 45 Accuracy 55.1 General . 55.2 Accuracy of transmission data 55.3 Static error (settle point error) 55.4 Dynamic error 55.5 Follow-up error 55.6 Settling time requirements to the directional system. 55.7 Correcting the magnetic heading by magnetic variations . 55.8 Adjusting of magnetic devia
10、tions and heeling error 55.9 Means of adjusting the deviation by vertical soft iron of the ship 65.10 Protection of correcting devices 66 Type tests . 66.1 General . 66.2 Transmission error test . 66.3 Fore-and-aft mark test 76.4 Static error test . 76.5 Follow-up error test 76.6 Settling time test
11、76.7 Tests for correcting the magnetic heading by magnetic variations . 76.8 Tests for adjusting magnetic deviations 86.9 Tests for the means of adjusting the deviation by vertical soft iron . 86.10 Dynamic accuracy . 86.11 Interface test . 86.12 Malfunction test . 87 Marking and identification 8Ann
12、ex A (informative) Equivalent requirements in ISO 22090-2 and IMO Resolution MSC.116(73).10Bibliography .11BS ISO 22090-2:2014ISO 22090-2:2014(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of pr
13、eparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, i
14、n liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IE
15、C Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives). Attention is drawn to the possibility
16、that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent
17、 declarations received (see www.iso.org/patents). Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as informa
18、tion about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 8, Ships and marine technology, Subcommittee SC 6, Navigation and ship operations.This second edit
19、ion cancels and replaces the first edition (ISO 22090-2:2004), which has been technically revised. It also replaces ISO 22090-2:2004/Cor1:2005.ISO 22090 consists of the following parts, under the general title Ships and marine technology Transmitting heading devices (THDs): Part 1: Gyro-compasses Pa
20、rt 2: Geomagnetic principles Part 3: GNSS principlesiv ISO 2014 All rights reservedBS ISO 22090-2:2014INTERNATIONAL STANDARD ISO 22090-2:2014(E)Ships and marine technology Transmitting heading devices (THDs) Part 2: Geomagnetic principles1 ScopeThis part of ISO 22090 specifies the construction, perf
21、ormance, and testing of a device employing only magnetic means as transmitting heading devices required by chapter V, SOLAS 1974 (as amended).A Transmitting Heading Device (THD) is an electronic device that provides information about the ships true heading.In addition to the general requirements con
22、tained in IMO Resolution A.694(17) to which IEC 60945 is associated and the relevant standard for the sensing part used, the THD equipment shall comply with the following minimum requirements.Where the IMO performance standards which apply to the sensing part do not specify a geographical operating
23、area the THD shall operatea) at a minimum rate of turn 20 /s andb) from 70 latitude south to 70 latitude north as a minimum.The THDs complying with the requirements contained in this part of ISO 22090 can be used for heading information as contained in chapter V of the SOLAS Convention.In addition s
24、uch THDs are intended to meet the dynamic requirements contained in the HSC Code, chapter 13 for the carriage of a suitable device providing heading information.NOTE 1 Several technologies can be used to detect and transmit heading information. It is illogical to standardize the detection of the hea
25、ding separately from the transmission of the heading. Therefore, separate parts of this part of ISO 22090 refer to different technologies. The requirements of this part of ISO 22090 only apply to the principle of the geomagnetic. Other technologies are covered in other parts of ISO 22090.NOTE 2 All
26、requirements that are extracted from the recommendation of IMO Resolution MSC.116(73) on performance standards for transmitting heading devices are printed in italics.A standard magnetic compass with a pickup sensor could be applied as a sensing part of this standard of geomagnetic principle. Howeve
27、r the IMO performance resolution MSC.116(73) requires that the THD is intended to be met for the dynamic requirements of the HSC code. Nevertheless, when the THD would be only used other than the HSC, the limit of rate of turn may be 6 /s instead of 20 /s.2 Normative referencesThe following document
28、s, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 11606, Ships and marine te
29、chnology Marine electromagnetic compassesISO 25862, Ships and marine technology Marine magnetic compasses, binnacles and azimuth reading devices ISO 2014 All rights reserved 1BS ISO 22090-2:2014ISO 22090-2:2014(E)IEC 60945, Marine navigation and radiocommunication equipment and systems General requi
30、rements Methods of testing and required test resultsIEC 61162-1, Marine navigation and radiocommunication equipment and systems Digital interfaces Part 1: Single talker and multiple listenersIEC 61162-2, Maritime navigation and radiocommunication equipment and systems Digital interfaces Part 2: Sing
31、le talker and multiple listeners, high-speed transmissionIEC 61924-2, Maritime navigation and radiocommunication equipment and systems Integrated Navigation Systems (INS) Part 2: Modular structure for INS Operational and performance requirements, methods of testing and required test resultsIMO Resol
32、ution MSC.116(73), Performance standards for marine transmitting heading devices (THDs)IMO Resolution A.424(XI), Performance standards for gyro-compassesIMO Resolution A.821(19), Performance standards for gyro-compasses for high-speed craftIMO Resolution MSC.252(83), Adoption of the revised performa
33、nce standards for integrated navigation system (INS)IMO Resolution MSC.302(87), Adoption of performance standards for bridge alert management3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.3.1geomagnetic principleprinciple of the THDs depending (fo
34、r its directional properties) upon the magnetism of the earth.Note 1 to entry: A type to directly detect geomagnetic field is called the electromagnetic-compass-type THD (see ISO 11606), while a type to detect magnetic field via standard magnetic compass is called the magnetic-compass-type THD (see
35、ISO 25862).3.2headingships heading to be input to the THD functionNote 1 to entry: It is defined by the direction of the vertical projection of the fore-and-aft line of the ship onto the horizontal plane. When measured relative to the true north, magnetic north, or compass north, it is respectively
36、defined as true heading, magnetic heading, or compass heading, and is usually expressed in degrees as a three-figure group, starting from north, in a clockwise direction around the compass card3.3true headinghorizontal angle between the vertical plane passing through the true meridian and the vertic
37、al plane passing through the crafts fore-and-aft datum line, measured from true north (000) clockwise through 3603.4magnetic compassinstrument designed to seek the direction of magnetic north in azimuth and to hold that direction permanently3.5magnetic sensormagnetic sensing part which detects the g
38、eomagnetic field concerning heading information with or without a magnetic compass and outputs the information to a processor2 ISO 2014 All rights reservedBS ISO 22090-2:2014ISO 22090-2:2014(E)3.6processordevice which obtains the ships magnetic heading information for a transmitting part by adjustin
39、g the magnetic deviations3.7transmitting partdevice which receives heading information from the sensing part and converts this to the required accurate signal3.8sensing partsensing function of detecting any heading information connected to the transmitting device3.9follow-up errorerror caused by the
40、 delay between the existence of a value to be sensed and the availability of the corresponding signal or data stream at the output of the systemEXAMPLE The difference between the real heading of the turning vessel and the available information at the output of the system.Note 1 to entry: A follow-up
41、 error disappears when the system is static.3.10transmission and resolution errorerror which is caused by the method used to transmit the original information to a receiving deviceNote 1 to entry: Such a method may have a limited capability to code any possible value of the information, e.g. step ou
42、tput with 1/6 resolution. This error is caused by the method used inside the THD and at its output to code the information.3.11static errorerror caused by any reason and which stays unchanged in value during the operation of the system, measured under static conditions3.12dynamic errorerror caused b
43、y dynamic influences acting on the system, such as vibration, roll, pitch, or linear accelerationNote 1 to entry: This error may have an amplitude and usually a frequency related to the environmental influences and the parameters of the system itself.4 Performance requirements4.1 FunctionalityGeomag
44、netic principles of THDs detect the horizontal component of geomagnetic field and generates a ships true heading signal for other devices.In one type of sensor which utilizes a magnetic compass, the performances and requirements of the compass shall conform to the ones referred to ISO 25862 and the
45、other type of the sensor shall fulfil the performance requirements concerning the marine electromagnetic compasses in ISO 11606.4.2 Information4.2.1 All displays with the exception of the sensor, and all outputs of heading shall indicate true heading.4.2.2 Manually entered values used for electronic
46、 correction shall be indicated by adequate means. ISO 2014 All rights reserved 3BS ISO 22090-2:2014ISO 22090-2:2014(E)4.3 Fore-and-aft markOn the bottom part of the binnacle and/or the housing of the sensor system, a fore-and-aft mark shall be inscribed to facilitate installation in the fore-and-aft
47、 line of the ship. The units shall be installed on the fore-and-aft line of the ship. In magnetic-compass-type THDs, it shall be in the vertical plane passing through the centre of the compass card and the main lubber mark to within 0,5.4.4 Heading informationThe THD shall provide true heading infor
48、mation to the other navigational equipment.4.5 Electrical wiringElectrical wiring, such as that for the direct-current power supply and that for connecting the units, shall not produce any perceptible errors in the heading information.4.6 Non-magnetic housingThe housing of the magnetic sensor system
49、 shall be non-magnetic.4.7 Alert signalAn alert1)shall be provided to indicate malfunctions of the THD or a failure of the power supply.An alert output shall be provided as any alert conditions. The alert shall conform to the presentation and handling requirements of Bridge Alert Management IMO Res. MSC.302(87). A suitable interface shall be provided for alert communications with an integrated navigation system IMO Res. MSC.252(83) and IEC 61924-2.The following sentences shall be provided for the alert comm
