The invention relates to a method for unambiguously determining a physical parameter Φ using m phase-measured values αi with 1≦i≦m, whereby the phase-measured values αi have different, integer periodicity values ni and an integer periodicity difference (a) with Δn>1 within an unambiguous range E of the physical parameter Φ. A value T with (b) and (c) is calculated based on the phase-measured values αi and the periodicity values ni thereof, and, within a reduced unambiguous range Ered with (d), a value V is allocated to the value T by allocation according to (e), wherein TUk stands for a respective lower limit and TOk for a respective upper limit of T. The allocation intervals between the upper (TOk) and the lower limits (TUk) for T, as wells as the distances (f) correspond at least to the periodicity difference Δn. In order to determine the physical parameter Φ, value V is added up with the phase-measured values αi in a weighted manner. Δ ⁢ ⁢ n =  n i - n i - 1  ( a ) T = T ⁡ ( α j , n i ) ( b ) j , l ∈ Z ⁢ { 1 , … ⁢ , i } ( c ) E red = 1 Δ ⁢ ⁢ n · E ( d ) V = V ⁡ ( T ) = { V 1 ⁢ f ⁢ u ¨ ⁢ r ⁢ ⁢ T ≥ T O ⁢ ⁢ 1 V 2 ⁢ f ⁢ u ¨ ⁢ r ⁢ ⁢ T U ⁢ ⁢ 2 ≤ T