1 / 22

JTA-3: EM-ambient site survey of industrial environments

JTA-3: EM-ambient site survey of industrial environments. Frank Leferink, Veronique Beauvois, Johan Catrysse. Background. The knowledge of the ambient noise is of interest in Planning and setting up wireless datacommunications (in industrial applications) and

zuwena
Télécharger la présentation

JTA-3: EM-ambient site survey of industrial environments

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. JTA-3: EM-ambient site survey of industrial environments Frank Leferink, Veronique Beauvois, Johan Catrysse MCM meeting COST 286, Split, dec. 2005

  2. Background • The knowledge of the ambient noise is of interest in • Planning and setting up wireless datacommunications (in industrial applications) and • to estimate the risk and impact of electromagnetic interference. • No (as far as known) data available on the EM ambient in industrial environments • Actions 2004/2005: • Collect and compare standards • Collect data from external sources • Collect data via measurements MCM meeting COST 286, Split, dec. 2005

  3. Standards • ITU-R P.372-8: Radio Noise • CCIR, “World distribution and characteristics of atmospheric radio noise,” Report 322, International Radio Consultive Committee, International Telecommunications Union, 1964 • ITU-P.534 Method for calculating sporadic-E field strength • CCIR, “Man-made radio noise,” Report 258-5, International Radio Consultive Committee, International Telecommunications Union, 1990 • ERC Report 69: Propagation Model • CIGRE 36.04: Guide on EMC in Power Plants and Substations • ITU 61 WG documents • IEC 61000-2 environments • CENELEC CLC/TS 50217 (2004-04): Guide for in situ measurements – In situ measurement of Disturbance emission MCM meeting COST 286, Split, dec. 2005

  4. Activities outside Europe • Australia: DSTO-TR-0855, A Comparison of DSTO and DERA HF Background Noise Measuring System with the International Radio Consultative Committee (CCIR) Model Data (2000) • US: NRaD TD 2813: CCIR Report 322 Noise Variation Parameters (1995) • US: NTIA Report 95-321: Broadband Spectrum Survey at Denver, Colorado, Sanders-Lawrence, (1995) • US: NTIA Report 96-330: The natural and man-made noise environment in personal communications services bands, Spaulding (1996) • US: NTIA Report 02-390, Man-Made noise measurements (2001) • Japan, Radio Noise Measurements and Related Standards, Sugiura (2003) MCM meeting COST 286, Split, dec. 2005

  5. Activities in Europe • Belgium: Study and simulation of the ambient noise of an industrial environment for wireless communication applications, Catrysse-Rayee, Degrendele (2005) • Netherlands: Radio Noise Measurements-European harmonisation of measurement methods (2005) • Spain: Novel Procedure to Determine Statistical Functions of Impulsive Noise, Torio-Sanchez (2005) • Sweden: Measurements of Man-Made Noise at VHF, Rantakko-Lofsved-Alexandersson (2005) • UK: RA(OfCom) AY 3952: Feasibility Study into the Measurement of Man-Made Noise (2001) • UK: RA(OfCom) AY4119: Man-Made Noise Measurement Programme (2003) • UK: Man-Made Noise Measurement Programme, Wagstaff-Merricks, IEE Proc.Comm(2005) • Etc. etc. etc. MCM meeting COST 286, Split, dec. 2005

  6. Conclusion on available data • There is a limited amount of information regarding man-made noise data. • It was either recorded before digital systems were deployed • It was recorded at limited bandwidths and at frequencies below 900MHz. • The currently available models (ITU or other) have value but are likely not to be sufficient for digital modulation methods. • There is a need to produce models, representative of current environmental conditions, and with appropriate bandwidths (and therefore time-resolutions) commensurate with current technology. MCM meeting COST 286, Split, dec. 2005

  7. What is MMN • Man Made Noise (MMN): • White Gaussian Noise (WGN) and • Impulsive Noise (IN), most of it is Class B noise, typically made up of very short impulses that are very wideband and are frequently man-made in origin. The class includes impulses from automotive ignition circuits, thermostats, lighting, etc. • Measurements cumbersome: fixed frequency and sampling the IF • Dedicated to establishing the noise floor for services • But results have not been used to establish the EMI limits….. MCM meeting COST 286, Split, dec. 2005

  8. Measurements • To establish noise floor for services: fixed frequency, and measure IF (APD) • EMI: scan of whole spectrum needed • Frequency spectrum: • 30 Hz - 10 kHz • 9 kHz - 150 kHz • 150 kHz - 30 MHz • 30 MHz - 1 GHz • 1 GHz - 12 GHz receiver computer ADC Needed for establishing the influence of noise on specific services MCM meeting COST 286, Split, dec. 2005

  9. Measurements • Students • Clean power: Static converter in a faraday box • Measurements performed by COST 286 members: • Catrysse: • Beauvois: • Leferink: • Batterman • You???? MCM meeting COST 286, Split, dec. 2005

  10. Noise levels in ITU P.372 MCM meeting COST 286, Split, dec. 2005

  11. Noise levels in CCIR 322 MCM meeting COST 286, Split, dec. 2005

  12. CCIR rep. 1963, levels converted to field strength MCM meeting COST 286, Split, dec. 2005

  13. Measurement data • UK Ofcom • Including statistics • Netherlands: 1997, 1999, 2005 • Belgium • Both only 'worst case': related to upper decile MCM meeting COST 286, Split, dec. 2005

  14. RA(OfCom) report AY 4119 MCM meeting COST 286, Split, dec. 2005

  15. Conclusion UK study • The mean values of Fa observed during this study appear significantly higher than the median values given in [P.372]. The best explanation available for this is that the number of electronic and electrical devices has grown dramatically in the UK over the past few decades. Whilst EMC legislation has suppressed the IN emissions from automotive sources, there is a general background of WGN that is possibly caused by the incoherent summation of the radiation from hundreds of pieces of equipment. If so, then this is an important finding that should be verified by further tests. MCM meeting COST 286, Split, dec. 2005

  16. Experiments in The Netherlands: dec 1999 MCM meeting COST 286, Split, dec. 2005

  17. Experiments in The Netherlands: dec 1999 • From a Thales report 1999: 'The noise levels and resulting radiated emission levels presented in Figure 2 are based on the studies performed around 1960. Comparing these levels with our measurement results obtained in nowadays urban and suburban environments in 1997 and 1999 we can observe an increase of approximately 20dB' MCM meeting COST 286, Split, dec. 2005

  18. Experiments on Atlantic (also industrial…): 2005 MCM meeting COST 286, Split, dec. 2005

  19. MCM meeting COST 286, Split, dec. 2005

  20. Experiments on Atlantic (also industrial…): 2005 MCM meeting COST 286, Split, dec. 2005

  21. Experiments in The Netherlands: july 2005 MCM meeting COST 286, Split, dec. 2005

  22. Actions: overview and status MCM meeting COST 286, Split, dec. 2005

More Related