Characterizing Signal Distortion Due to Space-time Processing of Interference Impacted GNSS Signals

Thyagaraja Marathe, Saeed Daneshmand, Gérard Lachapelle

Peer Reviewed

Abstract:	Space-time processing (STP) is studied in Global Navigation Satellite System (GNSS) as an effective tool to mitigate interference in spatiotemporal domain. However, without specific considerations, the STP results in biases and distortions in the cross-correlation function (CCF) of the ranging codes. The CCF degradation can happen due to the combined effect of space-time processing and the unintentional signal attenuation by filtering. This paper focuses on characterizing these degradations for different scenarios like the number of interference and number of tap delays in the temporal filter in STP. The results from characterization can be used for designing the low distortion filters that are especially important for high accuracy applications in challenging environments. The simulation test bed discussed in this paper enables one to perform accurate analyses in the field of STP. Additionally, an analysis of the independent contributions to the CCF degradation from STP and the signal attenuation is conducted. A new method based on the phases of space-time filter weights is presented and is shown to reduce the distortions due to STP, as supported by illustrative results.
Published in:	Proceedings of the 28th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2015) September 14 - 18, 2015 Tampa Convention Center Tampa, Florida
Pages:	3084 - 3093
Cite this article:	Marathe, Thyagaraja, Daneshmand, Saeed, Lachapelle, Gérard, "Characterizing Signal Distortion Due to Space-time Processing of Interference Impacted GNSS Signals," Proceedings of the 28th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2015), Tampa, Florida, September 2015, pp. 3084-3093.
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