G - Physics – 01 – S
Patent
G - Physics
01
S
G01S 5/14 (2006.01) G01S 1/00 (2006.01)
Patent
CA 2255494
The invention relates to a method of treating the L1 and L2 signals of a positioning system in which each of said L1 and L2 signals presents a single frequency carrier modulated by a known pseudo-random code P, itself modulated by an unknown code W, in which: a) each of the signals L1 and L2 is correlated in a respective system with a locally-generated replica of the P code; b) the first and second correlation signals obtained over a period equal to an estimated period (T1) for a bit of the W code are integrated to obtain respective first and second W code bit signals; and c) cross-correlated is then performed thereon. The invention is characterized in that, between b) and c), a test is performed firstly to see whether the first and/or second W code bit signal is greater than a first positive threshold value or less than a first negative threshold value, and for the purposes of said cross-correlation, only those first and/or second W code bit signals are retained for which the corresponding test is satisfied.
Cooper John
Silvestrin Pierluigi
Agence Spatiale Europeenne
Borden Ladner Gervais Llp
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