"A New Fine Tracking Algorithm for Binary Offset Carrier Modulated Signals"

In this paper, an analysis of a new synchronization technique for Binary Offset Carrier (BOC) modulated signals will be presented. Goal of the proposed method is to improve the synchronization performances by reducing the synchronization errors due to the characteristic BOC cross-correlation function. The synchronization is generally based on the envelope of the cross-correlation between the received signal and the local replicas. In a classical NRZ modulation this envelope is approximately a triangle whose peak corresponds to the perfect synchronization between the incoming signal and local replicas. In the BOC case, instead, the cross-correlation is given by a set of triangles with positive and negative peaks in which only the central one corresponds to the perfect synchronization. This paper will describe a novel technique characterized by a different choice of the local replica. In this manner the cross-correlation envelope is composed by different triangles with positive and negative peaks; this envelope has one and only one zero-crossing that corresponds to the perfect synchronization. In order to demonstrate the effectiveness of the method, a theoretical analysis has been carried on together with computer simulations. In particular, the main properties of the technique, compared with the classical situation, will be presented

Data Fusion Techniques for Multi-frequency Navigation Receivers

In this paper, a novel approach is presented to improve performance of a multi frequency Galileo receiver in urban environment. This study aims at developing fine tracking systems able to improve performances in a urban environment. In particular, two kinds of bi-frequency receivers are proposed: taking advantage of frequency diversity and data fusion methods both of them allow optimal performances of synchronization in an area where noise and multipath effects are particularly hostile. 1. GENERAL INFORMATION In the last years the GNSS systems have become more and more important in a variety of civilian applications. In fact the market trend is to offer services with characteristics of presence “anywhere and anytime”. Different applications are given in different fields: in car navigation, automatic position reporting during emergency cellular phone calls, monitor of crustal deformations. High performances are expected making necessary improved receivers able to use the new signal structure and to compensate possible disturbances of the considered environment. The base for the calculation of the user’s position is the triangulation procedure. For this analysis a precise estimation of the distance between the receiver and each satellite (pseudorange) is needed. The GNSS system

DISTRIBUTED COOPERATIVE MODE IDENTIFICATION FOR COGNITIVE RADIO APPLICATIONS

none4noM. GANDETTO; A. CATTONI; M. MUSSO; C. REGAZZONIM., Gandetto; A., Cattoni; M., Musso; Regazzoni, Carl