Patent ID: 8022873

Claim:
A method comprising: determining at least one angle of sight (θ) between a receiver device comprising at least two reception antennas (R 1 ,R 2 ), and at least one transmitter device comprising at least one antenna for transmitting radioelectric signals on at least two different wavelengths λ 1 and λ 2 configured to be received by the at least two reception antennas of said receiver device by: using the receiver device to estimate at least one difference in path length of the radioelectric signals between the two reception antennas (R 1 ,R 2 ) of a base of antennas so as to determine said at least one angle of sight, and using the receiver device to determine for each wavelength λ p considered, p=1 and 2, a measurement Δ{tilde over (ψ)} p 12 of phase difference C p Δφ p 12 between the two reception antennas (R 1 ,R 2 ), where C p denotes a nonzero real number and Δφ p 12 denotes a linear phase difference, dimensionally equivalent to a distance by: determining a virtual phase difference Δ{tilde over (ψ)} WL 12 between the two reception antennas (R 1 ,R 2 ) by linear combination of the measurements Δ{tilde over (ψ)} p 12 of phase differences determined for each wavelength λ p , expressed in the form: Δ ⁢ ψ ~ WL 12 = D ⁡ ( P C 1 ⁢ λ 1 ⁢ Δ ⁢ ψ ~ 1 12 - Q C 2 ⁢ λ 2 ⁢ Δ ⁢ ψ ~ 2 12 ) , where D denotes a nonzero real number, P and Q are nonzero integers such that Pλ 2 ≠Qλ 1 , determining an integer value Δ{circumflex over (N)} WL 12 of an ambiguity of the virtual phase difference Δ{tilde over (ψ)} WL 12 , equal to: Δ {circumflex over (N)} WL 12 =R (−Δ{tilde over (ψ)} WL 12 /D ), where R(x) denotes the integer closest to x, and determining a first estimation d WL 12 of the at least one difference in path length, equal to: d ^ WL 12 = λ WL 12 D ⁢ ( Δ ⁢ ψ ~ WL 12 + D ⁢ ⁢ Δ ⁢ ⁢ N ^ WL 12 ) , where λ WL 12 is a virtual wavelength equal to λ 1 λ 2 /(Pλ 2 −Qλ 1 ).