Mitigating the Impact of GNSS Signals in the Radio Astronomy Band 1610.6-1613.8 MHz

Olivier Julien and Jean-Luc Issler

Peer Reviewed

Abstract: In order to protect the Radio-Astronomy (RA) bands against radio-frequency interference, the International Telecommunication Union (ITU) issued a resolution recommending a maximum level of interference to different systems in the RA bands. This resolution includes Radionavigation Satellite Services (RNSS) as potential sources of interference since, for example, the RA band 1610.6–1613.8 MHz is located just beside the RNSS band 1559–1610 MHz. The goal of this paper is to introduce a signal processing technique that allows RA users to limit the impact of RNSS signals on RA observations. This technique is specifically aimed at RNSS signals with an encrypted component using CDMA techniques. This article shows that in the context of the Galileo signal, the proposed technique can reduce the maximum level of the Galileo signal’s power spectral density by approximately 10 dB in the RA band, thus significantly protecting the RA user.
Published in: NAVIGATION, Journal of the Institute of Navigation, Volume 56, Number 4
Pages: 229 - 240
Cite this article: Julien, Olivier, Issler, Jean-Luc, "Mitigating the Impact of GNSS Signals in the Radio Astronomy Band 1610.6-1613.8 MHz", NAVIGATION, Journal of The Institute of Navigation, Vol. 56, No. 4, Winter 2009-2010, pp. 229-240.
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