Industrial interference and radio astronomy
The interferer – victim scenario is described for the case of industrial interference affecting radio astronomical observatories. The sensitivity of radio astronomical receivers and their interference limits are outlined. EMC above 30 MHz is a serious problem for Radio Astronomy. Interferer (CISPR)...
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| Format: | Article |
| Language: | deu |
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Copernicus Publications
2013-07-01
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| Series: | Advances in Radio Science |
| Online Access: | http://www.adv-radio-sci.net/11/251/2013/ars-11-251-2013.pdf |
| Summary: | The interferer – victim scenario is described for the case of industrial
interference affecting radio astronomical observatories. The sensitivity of
radio astronomical receivers and their interference limits are outlined. EMC
above 30 MHz is a serious problem for Radio Astronomy. Interferer (CISPR)
and victim (ITU-R RA 769) standards are not harmonised. The emissions from
the interferer and their spectral characteristics are not defined
sufficiently well by CISPR standards. The required minimum coupling losses
(MCL) between an industrial device and radio astronomical antenna depends on
device properties but is shown to exceed 140 dB in most cases. Spatial
separation of a few km is insufficient on its own, the terrain must shield
> 30–40 dB, additional mitigations such as extra shielding or
suppression of high frequency emissions may be necessary. A case by case
compatibility analysis and tailored EMC measures are required for individual
installations. Aggregation of many weak rfi emitters can become serious
problem. If deployment densities are high enough, the emission constraints
can even exceed those for a single interferer at a short distance from the
radio observatory. Compatibility studies must account not only for the
single interferer but also for many widely distributed interference sources. |
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| ISSN: | 1684-9965 1684-9973 |