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This paper presents an innovative Doppler frequency estimation technique, which is particularly suited for global navigation satellite system (GNSS) receivers operating in vehicular scenarios. Mass-market and commercial navigation devices are being increasingly exploited for in-car navigation and for vehicular applications based on positioning. However, the low computational burden that can be afforded...
This paper presents a method for the classification of nonlinear systems through the study of the free oscillations in the time-frequency plane, when the measured data are affected by noise. Nonconservative SDOF (Single Degree Of Freedom) oscillators described by a nonlinear second order differential equation are considered. The nonlinearity is due to a nonlinear function of the state variable, which...
In this paper, the structure of a tracking loop with Extended Kalman Filter (EKF) is analyzed. Particular emphasis is given to the NCO update rule, which is seldom mentioned or studied in previous literature. Furthermore, the structure of an EKF-based software receiver is proposed including the special modules dedicated to the initialization and maintenance of the tracking loop. The EKF-based tracking...
Multipath often represents the dominant error source in GNSS (Global Navigation Satellite System). As a consequence, several techniques have been proposed to mitigate its undesired effects, including Linear Adaptive Filters (LAFs). In this paper a Least Squares (LS) filter is applied to a post-correlation GNSS signal. The case study considers a Galileo signal. Since after the correlation the noise...
It is known that signal acquisition can be treated as a two-dimensional search and all the possible results are located in the search plane as different cells. In this paper, the theoretical expression of the cross-ambiguity function (CAF) is analyzed, and the property of the approximate expression is exploited, while it is seldom addressed in previous GNSS receiver architectures. Based on the property...
Pre-correlation differential detection (PDD) scheme is studied for global navigation satellite systems (GNSS) receiver design. By performing a differential detection at the chip or sample level before correlation process, the effect of both data and residual carrier is eliminated which in turn allows for frequency independent code phase acquisition. Hence the search space and computational complexity...
The aim of this paper is to design the loop coefficients in real time in order to obtain a good trade-off in terms of performance with respect to both noise and to dynamics. In this work the optimization is performed while considering an input signal whose frequency assumes a generic shape. A cost function is built which takes into account in the same time both the transient and the steady state error...
This paper considers the possibility to integrate external altitude measurements with a Kalman based Global Navigation Satellite System (GNSS) receiver in a peer to peer scenario. The performance of such a system is investigated for different characteristics of the aiding measurement and for different degree of trust of the receiver upon the aiding measurement. The aiding measurement is obtained starting...
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