A method for determining the relative position between two receivers (5, 6, 26, 27, 28) of a satellite navigation system, in which the receivers (5, 6, 26, 27, 28) perform phase measurements on carrier signals (9, 10, 11) of the satellite navigation system, and in which an evaluation unit uses the phase measurements for determining the relative position of the receivers (5, 6, 26, 27, 28) characterized in that - position parameters of the relative position are determined by a linear estimation of the position parameters and phase ambiguities from the phase measurements without considering the integer property of the phase ambiguities, that - candidates of integer phase ambiguities are searched around the linear estimates of the phase ambiguities using a priori information about the length and orientation of a baseline extending between the two receivers (5, 6, 26, 27, 28), that - for each candidate of integer phase ambiguities associated candidate position parameters of the relative position are determined, which are maximizing an a-posteriori-probability for the position parameters using phase measurements and a priori information about the length and orientation of the baseline extending between the two receivers (5, 6, 26, 27, 28)), and that - final integer phase ambiguities and position parameters associated with the final integer phase ambiguities are selected from the candidates of integer phase ambiguities and associated candidate position parameters by evaluating a final cost function, which is arranged for evaluating the deviation of the candidate integer phase ambiguities from the linear estimates of the integer phase ambiguities and the deviation of the position parameters associated with the candidate phase ambiguities from the linear estimates of the position parameters. - position parameters of the relative position are determined by a linear estimation of the position parameters and phase ambiguities from the phase measurements without considering the integer property of the phase ambiguities, that - candidates of integer phase ambiguities are searched around the linear estimates of the phase ambiguities using a priori information about the length and orientation of a baseline extending between the two receivers (5, 6, 26, 27, 28), that - for each candidate of integer phase ambiguities associated candidate position parameters of the relative position are determined, which are maximizing an a-posteriori-probability for the position parameters using phase measurements and a priori information about the length and orientation of the baseline extending between the two receivers (5, 6, 26, 27, 28)), and that - final integer phase ambiguities and position parameters associated with the final integer phase ambiguities are selected from the candidates of integer phase ambiguities and associated candidate position parameters by evaluating a final cost function, which is arranged for evaluating the deviation of the candidate integer phase ambiguities from the linear estimates of the integer phase ambiguities and the deviation of the position parameters associated with the candidate phase ambiguities from the linear estimates of the position parameters.