Patent ID: 8611468
Filing Date: 2013-12-17
Classification: G01S,H04L

Abstract:
1. A digital modulated signal demodulator comprising: an input structured to receive a past value and a current value, both the past value and the current value associated with a same bit of global navigation satellite system data transmitted in different time instants; a bit decoder configured to provide a decoded bit from an input value wherein said bit decoder is structured to provide said decoded bit according to a maximum likelihood criteria; a quality signal evaluation module configured to provide a quality signal representing a quality of the current value; a filtering module structured to provide a filtered value computed as a weighted average of said past value and said current value, said filtering module structured to receive a reset signal based on the quality signal; and a selection module coupled between said input structure and said bit decoder, the selection module being configured to: transfer the current value as the input value of the bit decoder if the quality is greater than a reference value; and transfer the filtered value as the input value of the bit decoder if the quality is not greater than the reference value.