EN ISO 8729:1998

SLOVENSKI STANDARD
01-december-2000
Ships and marine technology - Marine radar reflectors (ISO 8729:1997)
Ships and marine technology - Marine radar reflectors (ISO 8729:1997)
Schiffe und Meerestechnik - Radarreflektoren für die Schiffahrt (ISO 8729:1997)
Navires et technologie maritime - Réflecteurs radars de marine (ISO 8729:1997)
Ta slovenski standard je istoveten z: EN ISO 8729:1998
ICS:
47.020.70 Navigacijska in krmilna Navigation and control
oprema equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

IS0
INTERNATIONAL
STANDARD
Second edition
1997-06-l 5
Ships and marine technology -
Marine radar reflectors
Navires et technologie maritime - Mflecteurs radars de marine
Reference number
IS0 8729: 1997(E)
IS0 8729:1997(E)
IS0 (the International Organization for Standardization) is a worldwide
federation of national standards bodies (IS0 member bodies). The work of
preparing International Standards is normally carried out through IS0
. 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, in liaison with ISO, also take part in the work. IS0
collaborates closely with the International Electrotechnical Commission
(IEC) on all matters of electrotechnical standardization.
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 least 75 % of the member bodies casting
a vote.
International Standard IS0 8729 was prepared by Technical Committee
ISO/TC 8, Ships and marine technology, Subcommittee SC 6, Navigation.
This second edition cancels and replaces the first edition (IS0 8729:1987),
which has been technically revised.
Annex A forms an integral part of this International Standard. Annex B is for
information only.
0 IS0 1997
All rights reserved. Unless otherwise specified, 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 Organization for Standardization
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Printed in Switzerland
IS0 8729:1997(E)
INTERNATIONAL STANDARD @ IS0
Marine radar reflectors
Ships and marine technology -
1 Scope
This International Standard specifies the minimum requirements for a radar reflector intended 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 reference 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 most recent editions of the standards indicated below. Members of IEC and IS0 maintain
registers of currently valid International Standards.
IEC 945:1994, Marine navigational equipment - Genera/ requirements - Methods of testing and required test
results.
IMO Resolution A.384(X) (adopted on 14 November 1977), 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 471 times the ratio of the 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.
NOTE - It is dependent on the radar operating frequency, and the three-dimensional orientation of the reflector. Polarization
of the transmitter and the received wave affects the effective echoing area of the reflector.
In case of free space propagation, the echoing area 0, in square metres, can be measured by the following equation:
4n3xSxR4
( 1
o=
PxG* xl*
where
S is the receiver power, in watts;
is the distance between radar and target, in metres;
R
@ IS0
IS0 8729: 199+(E)
P is the transmitting peak power, in watts;
G is the antenna gain;
1 is the wave length, in metres.
3.3 azimuthal polar Polar diagram relating the echoing area of the reflector to the
azimuthal angle
axis.
about its vertical
3.4 Luneberg reflector: Reflector, making use of a number of concentric spheres of varying refractive index,
capable of f
...