Nuclear Power Plants: Innovative Technologies for Instrumentation and Control Systems by Yang Xu

Author:Yang Xu
Language: eng
Format: epub
Publisher: Springer Singapore, Singapore

(3)

(f means working frequency, unit MHz; d means path distance, unit m; n means indoor propagation index, a constant within 2.0–3.3, relating to the nature of the building; in consideration of the situation in NI, n = 3; Le means through-wall loss)

(4)

Calculate the attenuation at 1 m away from the antenna:

The transmitting power at entrance of antenna is generally L(0) = 10 dBm, and we can calculate the power at 1 m away from antenna:

which is far lower than the value required for resistance to electromagnetic radiation interference. Therefore, we take the transmitting power at entrance of antenna L(0) = 10 dBm, that is to say, 10 mW meets the requirements.

According to one-way communication characteristics of the system in NI, the mobile phone terminal will not transmit signal in NI, so we do not need to consider the interference and influence of signal transmission at mobile terminal on other important devices, but we shall guarantee the transmitting power at entrance of antenna less than 10 mW.

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