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Chirp mitigation for wideband GNSS signals with filter bank pulse blanking

: Rügamer, Alexander; Joshi, Shrikul; Merwe, J. Rossouw van der; Garzia, Fabio; Felber, Wolfgang; Wendel, Jan; Schubert, Frank M.

Institute of Navigation -ION-, Manassas/Va.; Institute of Navigation -ION-, Satellite Division, Washington/DC:
30th International Technical Meeting of the Satellite Division of the Institute of Navigation, ION GNSS+ 2017. Proceedings : Sept. 25-29, 2017, Oregon Convention Center, Portland, Oregon, CD-ROM
Manassas/Va.: ION, 2017
Institute of Navigation, Satellite Division (ION GNSS International Technical Meeting) <30, 2017, Portland/Or.>
Conference Paper
Fraunhofer IIS ()
Navigationssystem; Navigation; Interferenz-Reduktion

In this paper a filter bank pulse blanking (FBPB) approach is presented as a wide-band (WB) mitigation method for chirp-like interferences. This method uses a filter bank to separate the received global navigation satellite system (GNSS) signal in different sub-bands. As the WB chirp is broken into several segments, standard time domain pulse blanking (PB) can be used to mitigate this interference. Especially for wide-band GNSS signals – like higher-order binary offset carrier (BOC) modulated ones – the FBPB approach can be optimized so that at least one main-lobe is not effected by the blanking. Therefore, continuous signal tracking can be achieved with only moderate performance degradation. The method is analyzed, implemented and evaluated in both software and hardware GNSS receivers. Synthetically generated chirp interferences as well as recordings of commercial privacy protection devices (PPDs) are used to assess the performance of the FBPB in a software GNSS receiver. The hardware GNSS receiver implementation processes the interferences in real-time, demonstrating that this method is a practical solution to WB chirp-like signals.