1、BRITISH STANDARD BSENISO 8729:1999 Ships and marine technology Marine radar reflectors The European Standard ENISO8729:1998 has the status of a British Standard ICS 47.020.70BSENISO8729:1999 This British Standard, having been prepared under the directionof the Electrotechnical Sector Committee, was
2、publishedunder the authority ofthe Standards Committee andcomes into effect on 15 March1999 BSI 05-1999 ISBN 0 580 32227 0 National foreword This British Standard is the English language version of ENISO 8729:1998. It is identical with ISO8729:1997. It supersedes BSENISO 8729:1995 which will be with
3、drawn on30th June1999. The UK participation in its preparation was entrusted to Technical Committee EPL/80, Maritime navigation and radiocommunication equipment and systems, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European commi
4、ttee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-refer
5、ences Attention is drawn to the fact that CEN and CENELEC standards normally include an annex which lists normative references to international publications with their corresponding European publications. The British Standards which implement these international or European publications may be found
6、 in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards
7、are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theENISO title page, page 2, the ISO title page, page ii, pages1
8、 to4, an inside back cover anda back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBSENISO 8729:1999 BSI 05-1999 i
9、 Contents Page National foreword Inside front cover Foreword 2 Foreword ii Text of ISO 8729 1ii blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM ENISO8729 December1998 ICS 47.020.70 Supersedes ENISO 8729:1994 Descriptors: See ISO document English version Ships and marine technology Marine rada
10、r reflectors (ISO8729:1997) Navires et technologie maritime Rflecteurs radars de marine (ISO8729:1997) Schiffe und Meerestechnik Radarreflektoren fr die Schiffahrt (ISO8729:1997) This European Standard was approved by CEN on6 December1998. CEN members are bound to comply with the CEN/CENELEC Interna
11、l Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member.
12、This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are
13、 the national standards bodies of Austria, Belgium, CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation E
14、uropisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1998 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. ENISO8729:1998EENISO 8729:1998 BSI 05-1999 2 Foreword The text of the International Standard I
15、SO8729:1998 has been prepared by Technical Committee ISO/TC8 “Ships and marine technology” in collaboration with Technical Committee CEN/TC300 “Sea-going vessels and marine technology”, the secretariat of which is held by DIN. This European Standard supersedes ENISO8729:1994. This European Standard
16、shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by June1999, and conflicting national standards shall be withdrawn at the latest by June1999. According to the CEN/CENELEC Internal Regulations, the national standards organi
17、zations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The
18、 text of the International Standard ISO8729:1998 was approved by CEN as a European Standard without any modification. Contents Page Foreword 2 1 Scope 1 2 Normative references 1 3 Definitions 1 4 Construction 1 5 Performance requirements 1 6 Type tests and inspection 3 7 Marking 4 8 Installation 4 A
19、nnex A (normative) Mounting height of the reflectors Inside back cover Annex B (informative) Bibliography Inside back cover Figure 1 Example diagram produced by a Luneberg reflector 2 Figure 2 Example diagram produced by a corner reflector 3ENISO8729:1998 ii BSI 05-1999 Foreword ISO (the Internation
20、al Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been e
21、stablished has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standard
22、ization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least75% of the member bodies casting a vote. International Standard ISO8729 was prepared by Technical Committee
23、 ISO/TC8, Ships and marine technology, Subcommittee SC6, Navigation. This second edition cancels and replaces the first edition (ISO8729:1987), which has been technically revised. Annex A forms an integral part of this International Standard. Annex B is for information only. Descriptors: Shipbuildin
24、g, sea navigation, instruments, radar equipment, installation, specifications, performance, manufacturing requirements, tests, type testing (tests), performance tests, marking.ENISO 8729:1998 BSI 05-1999 1 1 Scope This International Standard specifies the minimum requirements for a radar reflector i
25、ntended to enhance returns from small vessels as required by IMO Resolution A.384(X). It lays down the specification for the construction, performance, installation, testing and inspection of such radar reflectors. 2 Normative references The following standards contain provisions which, through refe
26、rence in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the
27、 most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. IEC945:1994, Marine navigational equipment General requirements Methods of testing and required test results. IMOResolution A.384(X) (adopted on14November1977
28、), Performance standards for radar reflectors. 3 Definitions For the purposes of this International Standard, the following definitions apply. 3.1 radar reflector any passive device which is designed to enhance returns from small radar targets 3.2 echoing area area which is 4; times the ratio of the
29、 power per unit solid angle scattered in a specified direction to the power per unit area in a plane wave incident on the scatterer from a specified direction NOTEIt is dependent on the radar operating frequency, and the three-dimensional orientation of the reflector. Polarization of the transmitter
30、 and the received wave affects the effective echoing area of the reflector. In case of free space propagation, the echoing area , in squaremetres, can be measured by the following equation: where 3.3 azimuthal polar diagram polar diagram relating the echoing area of the reflector to the azimuthal an
31、gle about its vertical axis 3.4 Luneberg reflector reflector, making use of a number of concentric spheres of varying refractive index, capable of focusing incident energy onto a reflecting surface (see Figure 1) 3.5 corner reflector reflector, consisting of three flat conducting surfaces intersecti
32、ng mutually at right angles, which reflects the greater part of the incident waves parallel to their direction of incidence (see Figure 2) 4 Construction 4.1 Structure and materials The materials used for the radar reflector shall be of sufficient strength and quality as to make the reflector capabl
33、e of maintaining reflection performance under conditions of stress due to sea states, vibration, humidity and change of temperature likely to be experienced in the marine environment as specified in6.2 and6.3. Use of ferrous metals should be avoided. 4.2 Colour The radar reflector intended for insta
34、llation on board vessels shall not be coloured black. It should be of a highly visible colour. 5 Performance requirements The radar reflector shall comply with the following minimum requirements for all frequencies between9320MHz and9500MHz. 5.1 Reflecting pattern in horizontal plane 5.1.1 The maxim
35、um echoing area of the radar reflector shall be at least10m 2 . 5.1.2 Its azimuthal polar diagrams shall be such that its response over a total angle of240 is not lessthan2,5m 2 . The response shall not remain below this level over any single angle of more than10. S is the receiver power, in watts;
36、R is the distance between radar and target, in metres; P is the transmitting peak power, in watts; G is the antenna gain; is the wave length, in metres.ENISO8729:1998 2 BSI 05-1999 NOTETypical azimuthal polar diagrams of two types of marine radar reflector are shown in Figure 1 and Figure 2. 5.1.3 T
37、hese requirements shall be assessed by reference to related azimuthal polar diagrams about the reflectors vertical axis and tilted from the vertical at angles not exceeding 3. 5.2 Reflecting pattern in vertical plane The performance of the reflector, up to at least 15 from the horizontal shall be su
38、ch that its response at any inclination remains above0,625m 2over a total angle of at least240. 5.3 Other requirements The radar reflector shall be in accordance with the requirements for classX equipment in IEC945:1994, clause3. Figure 1 Example diagram produced by a Luneberg reflectorENISO 8729:19
39、98 BSI 05-1999 3 6 Type tests and inspection 6.1 Visual inspection A visual inspection shall be carried out to confirm that the construction and finish of the reflector are satisfactory. 6.2 Performance test The performance test shall be carried out in a chamber or on a test site where the backgroun
40、d noise level has been reduced to the equivalent echoing area of0,01m 2or less at frequencies between9320MHz and9500MHz. The test shall consist of measurement of polar patterns of the reflector within the volume defined in5.1 and5.2. These shall be spaced in elevation with a separation not exceeding
41、2,5. Figure 2 Example diagram produced by a corner reflectorENISO8729:1998 4 BSI 05-1999 6.3 Mechanical strength test The reflector shall be mounted in the recommended way and moved under water at a relative velocity of1,3m/s in both directions in each of three mutually perpendicular planes consecut
42、ively. The reflector, mounted in the recommended way, shall also be subjected to a jet of water delivered at a rate of1kPa for a period of not less than10s on five separate locations on each face. 6.4 Other tests The following tests shall be performed on the reflector: Dry heat cycle test, in accord
43、ance with IEC945:1994, 4.4.2; Damp heat cycle test, in accordance with IEC945:1994, 4.4.3; Low temperature cycle test, in accordance with IEC945:1994, 4.4.4; Thermal shock test, in accordance with IEC945:1994, 4.4.5; Drop test, in accordance with IEC945:1994, 4.4.6; Vibration test, in accordance wit
44、h IEC945:1994, 4.4.7; Corrosion test, in accordance with IEC945:1994, 4.4.11. 7 Marking A label shall be affixed to each reflector, on a surface that does not contribute significantly to radar reflector performance, indicating: a) the manufacturer; b) the mark or type number; c) the year of manufact
45、ure; d) the recommended mounting height of installation (see8.3 and Annex A); e) the mass of the reflector; f) the maximum echoing area of the reflector; g) the compass safe distance, if applicable; h) the recommended orientation of mounting. 8 Installation 8.1 Method The radar reflector shall be in
46、stalled in accordance with a method recommended by the manufacturer. Fixing arrangements shall be provided so that the reflector can be fitted in its correct orientation either on a rigid mount or suspended in rigging. 8.2 Positioning The radar reflector should be installed in the optimum position f
47、or the avoidance of shadow sectors. 8.3 Mounting height The mounting height of a reflector shall be higher than the value given in Annex A.ENISO8729:1998 BSI 05-1999 Annex A (normative) Mounting height of the reflectors Annex B (informative) Bibliography 1 IMO Resolution A.477(XII) (adopted on19 Nov
48、ember1981), Performance standards for radar equipment.BSENISO 8729:1999 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the international lev
49、el. It is incorporated by Royal Charter. Revisions BritishStandards are updated by amendment or revision. Users of BritishStandards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this BritishStandard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel:
