1、 Recommendation ITU-R M.693-1(03/2012)Technical characteristics of VHF emergency position-indicating radio beacons using digital selective callingM SeriesMobile, radiodetermination, amateurand related satellite servicesii Rec. ITU-R M.693-1 Foreword The role of the Radiocommunication Sector is to en
2、sure the rational, equitable, efficient and economical use of the radio-frequency spectrum by all radiocommunication services, including satellite services, and carry out studies without limit of frequency range on the basis of which Recommendations are adopted. The regulatory and policy functions o
3、f the Radiocommunication Sector are performed by World and Regional Radiocommunication Conferences and Radiocommunication Assemblies supported by Study Groups. Policy on Intellectual Property Right (IPR) ITU-R policy on IPR is described in the Common Patent Policy for ITU-T/ITU-R/ISO/IEC referenced
4、in Annex 1 of Resolution ITU-R 1. Forms to be used for the submission of patent statements and licensing declarations by patent holders are available from http:/www.itu.int/ITU-R/go/patents/en where the Guidelines for Implementation of the Common Patent Policy for ITU-T/ITU-R/ISO/IEC and the ITU-R p
5、atent information database can also be found. Series of ITU-R Recommendations (Also available online at http:/www.itu.int/publ/R-REC/en) Series Title BO Satellite delivery BR Recording for production, archival and play-out; film for television BS Broadcasting service (sound) BT Broadcasting service
6、(television) F Fixed service M Mobile, radiodetermination, amateur and related satellite services P Radiowave propagation RA Radio astronomy RS Remote sensing systems S Fixed-satellite service SA Space applications and meteorology SF Frequency sharing and coordination between fixed-satellite and fix
7、ed service systems SM Spectrum management SNG Satellite news gathering TF Time signals and frequency standards emissions V Vocabulary and related subjects Note: This ITU-R Recommendation was approved in English under the procedure detailed in Resolution ITU-R 1. Electronic Publication Geneva, 2012 I
8、TU 2012 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without written permission of ITU. Rec. ITU-R M.693-1 1 RECOMMENDATION ITU-R M.693-1 Technical characteristics of VHF emergency position-indicating radio beacons using digital selective calling (1990
9、-2012) Scope This Recommendation details the technical characteristics of an emergency position-indicating radio beacon. This beacon operates in the VHF band, in allocations exclusive to the maritime mobile service, and uses the digital selective calling (DSC) system as detailed in Recommendation IT
10、U-R M.493. This radio beacon will be referred to by the acronym: VHF EPIRB. The ITU Radiocommunication Assembly, considering a) that the alerting and locating functions are parts of the basic requirements of the global maritime distress safety system (GMDSS); b) that the characteristics of the DSC s
11、ystem are given in Recommendation ITU-R M.493; c) that the characteristics of a search and rescue radar transponder (SART) for locating purposes are given in Recommendation ITU-R M.628, recognizing that chapter IV of the 1988 Amendments to the International Convention for the Safety of Life at Sea (
12、SOLAS), 1974, permits the carriage of a DSC VHF EPIRB in sea area A11in lieu of a satellite EPIRB, recommends that the technical characteristics of DSC VHF EPIRBs should be in accordance with Annex 1 and with Recommendation ITU-R M.493. 1“Sea area A1” means an area within the radiotelephone coverage
13、 of at least one VHF coast station in which continuous DSC alerting is available, as may be defined by a contracting government to the 1974 SOLAS Convention (as amended). 2 Rec. ITU-R M.693-1 Annex 1 Minimum technical characteristics of DSC VHF EPIRBs 1 General DSC VHF EPIRBs should be capable of tr
14、ansmitting distress alerts by digital selective calling and of providing a locating or homing facility. To meet the locating requirements of the GMDSS, Regulation IV/8.3.1 of the 1974 SOLAS Convention requires that a SART (see Recommendation ITU-R M.628) be used for this function. The EPIRB should b
15、e provided with a battery of sufficient capacity to enable it to operate for a period of at least 48 hours. The EPIRB should be designed to operate under the following environmental conditions: ambient temperatures of 20 C to + 55 C; icing; relative wind speeds up to 100 knots; after stowage at temp
16、eratures between 30 C and + 65 C. 2 Alerting transmissions The alerting signals should be transmitted on the frequency 156.525 MHz using G2B class of emission. The frequency tolerance should not exceed 10 parts per million. The necessary bandwidth should be less than 16 kHz. The emission should be v
17、ertically polarized. The antenna should be omnidirectional in the azimuthal plane and sufficiently high to ensure reception of the transmission at the maximum range of the A1 sea area. The output power2should be at least 100 mW. 3 DSC message format and transmission sequence The technical characteri
18、stics for the DSC message should be in accordance with the sequence for the “distress call” specified in Recommendation ITU-R M.493. The “nature of distress” indication should be “EPIRB emission” (symbol No. 112). The “distress coordinates” and “time” information need not be included. In this case t
19、he digit 9 repeated 10 times and the digit 8 repeated four times should be included, respectively, as specified in Recommendation ITU-R M.493. The “type of subsequent communication” indication should be “no information” (symbol No. 126) which indicates that no subsequent communications will follow.
20、2The output power required to carry a ship-to-shore alert at the maximum range of the A1 sea area should be at least 6 W with an appropriate antenna height above sea level. Rec. ITU-R M.693-1 3 The alerting signals should be transmitted in bursts. Each burst should consist of five successive DSC sequences with the (N + 1)thburst of transmission being made with an interval Tnafter the (N)thburst as given in Fig. 1, where: Tn= (240 + 10 N) s ( 5%) and N = 0, 1, 2, 3, , etc. FIGURE 1 M.0693-01Tn( + 1)th burst5 sequencesNNth burst5 sequences
