Patent ID: 6833813
Filing Date: 2004-12-21
Classification: G01S

Abstract:
Method for determining in a positioning system a time of reception of a received beacon signal transmitted by a beacon and received by a receiver receiving and tracking signals at least from this beacon, wherein signals from said beacon have a component of a known regularity, said method comprising:a) reconstructing a beacon signal for an interval (Tstart,Tend) based on available information on signals from said beacon valid for said interval; b) performing a cross-correlation between overlapping parts of said reconstructed beacon signal and said received beacon signal at different relative positions to each other; c) determining a time of transmission of said received beacon signal based on information for said reconstructed signal and on a relative position resulting in a maximum correlation value between said reconstructed beacon signal and said received beacon signal; and d) determining the time of reception of said received beacon signal as a sum of said determined time of transmission (TTOT) of said received beacon signal and of a calculated time of flight (TTOF) of said received beacon signal.