【正文】 ..................................................................................................... 8 Integrity ................................................................................................................... 8 Interfaces ................................................................................................................ 9 IEC 611621, IEC 611622 implementation .............................................................. 9 IEC 611623 implementation ................................................................................... 9 Display and control .................................................................................................. 9 Installation .............................................................................................................. 9 5 Technical characteristics ................................................................................................ 10 Carrier frequency .................................................................................................. 10 Frequency tolerance .............................................................................................. 10 Message types ..................................................................................................... .10 Data transmission rate ..........................................................................................10 Dynamic range ...................................................................................................... 10 Maximum bit error ratio .........................................................................................10 Receiver selectivity and stability ............................................................................10 Automatic frequency selection ............................................................................... 11 Protection ratios .................................................................................................... 11 6 Methods of testing and required test results ................................................................... 12 General conditions of measurement and test signals ............................................. 12 Operational tests ................................................................................................... 13 P rotection of external connections ....................................................................... .. 1 7 Integrity ................................................................................................................. 17 Technical tests ...................................................................................................... 17 Additional functionality tests .................................................................................. 19 Annex A (normative) Simulation of noise situations for the test of shipborne DGPS maritime radio beacon receiver equipment ............................................................................ 20 Parameters describing noise .......................................................................................... 20 Noise models ................................................................................................................. 21 Test procedures ............................................................................................................. 25 Annex B (informative) Methodology for measuring W ER ..................................................... 26 Recording the RTCM data stream ................................................................................... 26 Analysing the RTCM data stream ................................................................................... 26 Caution .......................................................................................................................... 26 `,``,``,`,`,`,` Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELEC No reproduction or working permitted without license from IHS Not for Resale `,``,``,`,`,`,` Page 4 EN 61108?4:2020 Annex C (normative) Tests that are specific to integrated equipment that does not provide an output port for testing ............................................................................................... 29 General requirements ..................................................................................................... 29 Test of W ER display ....................................................................................................... 29 Comments to Clause 6, methods of testing ..................................................................... 29 Annex D (informative) Installation guidelines to counteract the effect of interference ........... 30 Introduction .................................................................................................................... 30 A ntennas ........................................................................................................................ 30 General installation requirements ................................................................................... 31 Noise/interference sources ............................................................................................. 33 Testing ........................................................................................................................... 33 Troubleshooting.............................................................................................................. 34 Annex E (informative) Implementation using a concurrent process ....................................... 35 Annex F (informative) Data interface guidance .........