Industrial interference and radio astronomy
Industrial interference and radio astronomy
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工业干扰和射电天文学
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
A. Jessner
中科院分区：
文献类型：
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作者：
A. Jessner
摘要。描述了工业干扰影响射电天文台的干扰受害者情景。概述了射电天文接收机的灵敏度及其干扰极限。30兆赫以上的电磁兼容是射电天文学的一个严重问题。干扰（CISPR）和受害者（ITU-R RA 769）标准不协调。干扰源的发射及其光谱特性没有被CISPR标准很好地定义。工业设备和射电天文天线之间所需的最小耦合损耗（MCL）取决于设备特性，但在大多数情况下超过140 dB。几公里的空间间隔本身是不够的，地形必须屏蔽bbb30 - 40db，可能需要额外屏蔽或抑制高频发射等额外缓解措施。个别安装需要逐个进行兼容性分析和定制的EMC措施。许多弱射频发射器的聚集可能成为严重的问题。如果部署密度足够高，发射限制甚至可以超过距离射电天文台很近的单个干扰的限制。兼容性研究不仅要考虑单个干扰源，而且要考虑许多广泛分布的干扰源。
Abstract. 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.