DGPS & Loran SNR Improvements by Null Steering and De-Coupling Magnetic Loop Antennas

Benjamin B. Peterson, David M. Dermanelian, Sean R. Katz, Kenneth U. Dykstra

Abstract:	In the presence of localized noise we find significant improvements in the signal to noise power ratio (SNR) when receiving DGPS and LORAN signals using a dual loop, H-field antenna. A composite, directional receive pattern is formed by combining the signal arriving on each loop. Steering the null of the figure-eight pattern towards an offending noise source yields significant improvement in SNR when the noise is strong and highly directional (e.g. thunderstorm). We find significantly more improvement when the noise and source are not collinear and when the when the SNR conditions are at their worst. We also find that removing the effects of antenna coupling in software before combining them significantly deepens the nulls in the receive pattern and improves our ability to minimize the negative effect of the noise, particularly when the noise is highly directional.
Published in:	Proceedings of the 53rd Annual Meeting of The Institute of Navigation (1997) June 30 - 2, 1997 Albuquerque, NM
Pages:	545 - 554
Cite this article:	Peterson, Benjamin B., Dermanelian, David M., Katz, Sean R., Dykstra, Kenneth U., "DGPS & Loran SNR Improvements by Null Steering and De-Coupling Magnetic Loop Antennas," Proceedings of the 53rd Annual Meeting of The Institute of Navigation (1997), Albuquerque, NM, June 1997, pp. 545-554.
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