Method and circuit for the reception of signals for positioning

Details Method and circuit for the reception of signals for positioning Method and circuit for the reception of signals for positioning

1996-12-16

1998-07-14

Tarcza, Thomas H.

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a satellite

375208, 455 65, H04B 7185, G01S 502

Patent

active

057811520

ABSTRACT:
The disclosure pertains to receivers for positioning by satellite. To reduce the harmful effects of the paths reflected on the GPS measurement of position which should take account only of the path of the radiofrequency signals in direct line of sight, a method is proposed enabling the elimination of the influence of the multiple paths by simple extrapolation computation. Measurements are made by correlation with four pseudo-random codes E1, E2, L1, L2 that are replicas of a code received from a satellite. A first set of measurements of correlation energy values and of time received is carried out with the codes E1, L1 corresponding to an advance and a delay d with respect to a punctual code and a second set of measurements is carried out the codes E2, L2 corresponding to an advance and a delay k.d (k being different from 1 and 0). By linear extrapolation, a deduction is made therefrom of the measurements for k=0, which no corresponds to the case where the multiple paths have no effect. The disclosed method and circuit can be implemented with only one servo-control loop or with two independent loops.

REFERENCES:
patent: 3706933 (1972-12-01), Bidell et al.
patent: 5101416 (1992-03-01), Fenton et al.
patent: 5208856 (1993-05-01), Leduc et al.
patent: 5224161 (1993-06-01), Daniel et al.
patent: 5347536 (1994-09-01), Meehan
patent: 5414729 (1995-05-01), Fenton
patent: 5615232 (1997-03-01), Van Nee

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