Patent ID: 6891362

Claim:
A method of estimating the phase rotation of a signal of interest from first and second signals, the method comprising: a) determining whether a predetermined relationship exists between the magnitudes of the first and second signals; b) if the predetermined relationship is determined to exist, moving to step g); c) if the predetermined relationship does not exist, multiplying the first signal by a predetermined scaling factor to produce a multiplied signal; d) determining whether the predetermined relationship exists between the multiplied signal and the second signal; e) if the predetermined relationship does not exist between the multiplied signal and the second signal, multiplying the multiplied signal by the predetermined scaling factor; f) repeating steps d) and e) until the predetermined relationship exists; g) determining on how many occasions a signal was multiplied before the predetermined relationship came to exist; and h) estimating the phase rotation using the number of occasions of multiplication so determined.