Method of organization of radio-wave control of large-sized radio-transparent shelters in an anechoic chamber


Аuthors

Larin A. A.1*, Bodryshev V. V.2**

1. Kaluga-based instrument-making plant «Typhoon», Kaluga, Russian Federation
2. Moscow Aviation Institute (National Research University), 4, Volokolamskoe shosse, Moscow, А-80, GSP-3, 125993, Russia

*e-mail: larintema@ya.ru
**e-mail: soplom@mail.ru

Abstract

Various radio transparent fairings are used to protect radar antennas from environmental influences. The main electrotechnical requirement for these products is the need for radio transparency (introduction of minimum electromagnetic wave (EMW) distortion) while maintaining strength and protective properties.
Due to the complexity of the technological cycle of their manufacture and the widespread use of manual labour in the formation of the layers of the radio-transparent wall, there are often various deviations in their design, such as deviations in the thickness of the layers of cladding or filler, an increase in the binder in one of the layers. Such variations can have a significant impact on the radiotransmission of the finished product, so the task of controlling the radiotransmission of RPUs at the production and incoming inspection stages is extremely important. In particular, this task becomes more complicated in the case of the need to control large-format RPUs (the size of which exceeds 2...3 metres), due to their large dimensions.
The paper describes the problem of creating anechoic chambers. Recommendations are given for the choice of the shape of the anechoic chamber in order to exclude the first and second electromagnetic wave over-reflections in its working area. Such decisions make it possible to minimise the influence of EMW over-reflections from the polygon elements on the measurement result. However, in order to combat the over-reflections from the radio-transparent wall, it is necessary to use additional mechanisms. To solve this problem, the author proposed and patented a method that allows to measure both the magnitude of the energy losses and the EMV phase run-up in the radio transparent wall in a wide range of frequencies. This method makes it possible to suppress the influence of EMV reflection from the radio transparent wall on the measurement result. The technical result is obtained by carrying out a series of measurements of the signal level at variation of the phase of the reflected wave in the interval between the measuring antenna and the wall, with subsequent mathematical processing of the results. The phase is varied by changing the position of the fairing relative to the antenna.
Experimental evaluation of the measurement error of radio parameters using the proposed method was carried out. As a result of the experiment it was established that the proposed method of organising the radio wave control allows to carry out measurements of energy losses with an error not exceeding 0.2 dB and measurements of the EMW phase run-up with an error not exceeding 5% in the frequency range from 3 to 11 GHz.

Keywords:

radar station, fairing, radio-transparent shelter, electromagnetic wave, loss magnitude, transmission coefficient, phase raid

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