Assessment of Vector-Tracking-Loop Performance Under Radio Frequency Interference Environments

Sun-Jun Ko, Bernd Eissfeller, Jong-Hoon Won, and Thomas Pany

Abstract:	This paper presents assessment and analysis of Vector-Tracking-Loop (VTL) under Radio Frequency Interference (RFI) environments. The VTL approach provides the benefits of higher signal sensitivity performance comparing with conventional tracking loop methods like DLL/PLL/PLL, where the VTL makes it possible to track lower power satellite signals than normal signal condition through deeply coupled architecture to incorporate signal processing and navigation processing in a single-step. Since early 2000s, VTL design approaches have been designed and implemented by using two core techniques such as a global loop closure and a signal tracking Kalman filter. It is known that the efficient use of signal tracking Kalman filter and the global loop that is to make an efficient channel interaction provide around 3dB and 4dB improvement, respectively, in terms of signal-to-noise ratio comparing with traditional tracking loops. Also the integration of both methods makes it possible to provide 7dB enhancement [1]. Several previous researches showed its performance enhancement evaluated by numerical analysis [1,2]. However, Kalman filter needs to be tuned to achieve better performance in terms of signal-to-noise ratio through considering a narrow noise bandwidth. According to filter tuning, it can be realized in less noise jitter under certain dynamic condition.
Published in:	Proceedings of the 25th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2012) September 17 - 21, 2012 Nashville Convention Center, Nashville, Tennessee Nashville, TN
Pages:	2333 - 2341
Cite this article:	Ko, Sun-Jun, Eissfeller, Bernd, Won, Jong-Hoon, Pany, Thomas, "Assessment of Vector-Tracking-Loop Performance Under Radio Frequency Interference Environments," Proceedings of the 25th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2012), Nashville, TN, September 2012, pp. 2333-2341.
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