Real-time minimization of the total tracking error in phase and delay lock loops - a second approach of the Fast Adaptive Bandwidth algorithm

Fabrice Legrand and Christophe Macabiau

Abstract:	We will present in this paper a new real-time method in order to minimize the error of code or carrier phase measurements provide by Phase Lock Loop (PLL) and Delay Lock Loop (DLL) systems. The method is able to automatically and dynamically set the loop filter parameters of PLL and DLL in order to minimize the total error of phase measurements by taking into account of Line Of Sight (LOS) dynamics and of the level of noise on the received signal. This method is a continuation of the so-called ‘Fast Adaptive Bandwidth Algorithm’ that has been presented on [2]. The method is based on real-time estimations of dynamics and noise level on received signal by observing the error signal provides at the output of the discriminator. By the knowledge of the analytic expression of the total error on phase measurements, which is based on the linear model of the loops, we can build an optimization function. The solution of this function provides the optimal loop bandwidth that results on the better compromise between the bias due to dynamics and the noise on phase measurements in order to minimize these two components of the total error.
Published in:	Proceedings of the 57th Annual Meeting of The Institute of Navigation (2001) June 11 - 13, 2001 Albuquerque, NM
Pages:	408 - 413
Cite this article:	Legrand, Fabrice, Macabiau, Christophe, "Real-time minimization of the total tracking error in phase and delay lock loops - a second approach of the Fast Adaptive Bandwidth algorithm," Proceedings of the 57th Annual Meeting of The Institute of Navigation (2001), Albuquerque, NM, June 2001, pp. 408-413.
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