Filling level measuring device that operates according to the FMCW method or the pulse time method, comprising: an echo curve detection unit (104, 102, 110) for detecting a plurality of temporally successive echo curves, each comprising at least one echo; an evaluation unit configured to execute a tracking method and configured to: determine a first echo and a second echo in each of the echo curves detected, respectively, by evaluating the echo curves, the first echoes being assigned to an arbitrary first track and the second echoes being assigned to an arbitrary second track; characterized in that the evaluation unit is further configured to: calculate a first functional relationship between the temporally successive positions of the first track and the temporally successive positions of the second track of the echo curves; wherein the echo curve detection unit (104, 102, 110) is configured to detect an additional, temporally subsequent echo curve; the evaluation unit being further configured to: determine the position of a first echo of the additional echo curve by evaluating the additional echo curve, the first echo belonging to the first track; calculate a position of the second track of the additional echo curve based on using the position of the first echo of the additional echo curve, or the position of the first track of the additional echo curve, and the first functional relationship. an echo curve detection unit (104, 102, 110) for detecting a plurality of temporally successive echo curves, each comprising at least one echo; an evaluation unit configured to execute a tracking method and configured to: determine a first echo and a second echo in each of the echo curves detected, respectively, by evaluating the echo curves, the first echoes being assigned to an arbitrary first track and the second echoes being assigned to an arbitrary second track; characterized in that the evaluation unit is further configured to: calculate a first functional relationship between the temporally successive positions of the first track and the temporally successive positions of the second track of the echo curves; wherein the echo curve detection unit (104, 102, 110) is configured to detect an additional, temporally subsequent echo curve; the evaluation unit being further configured to: determine the position of a first echo of the additional echo curve by evaluating the additional echo curve, the first echo belonging to the first track; calculate a position of the second track of the additional echo curve based on using the position of the first echo of the additional echo curve, or the position of the first track of the additional echo curve, and the first functional relationship. determine a first echo and a second echo in each of the echo curves detected, respectively, by evaluating the echo curves, the first echoes being assigned to an arbitrary first track and the second echoes being assigned to an arbitrary second track; characterized in that the evaluation unit is further configured to: calculate a first functional relationship between the temporally successive positions of the first track and the temporally successive positions of the second track of the echo curves; wherein the echo curve detection unit (104, 102, 110) is configured to detect an additional, temporally subsequent echo curve; the evaluation unit being further configured to: determine the position of a first echo of the additional echo curve by evaluating the additional echo curve, the first echo belonging to the first track; calculate a position of the second track of the additional echo curve based on using the position of the first echo of the additional echo curve, or the position of the first track of the additional echo curve, and the first functional relationship. calculate a first functional relationship between the temporally successive positions of the first track and the temporally successive positions of the second track of the echo curves; wherein the echo curve detection unit (104, 102, 110) is configured to detect an additional, temporally subsequent echo curve; the evaluation unit being further configured to: determine the position of a first echo of the additional echo curve by evaluating the additional echo curve, the first echo belonging to the first track; calculate a position of the second track of the additional echo curve based on using the position of the first echo of the additional echo curve, or the position of the first track of the additional echo curve, and the first functional relationship. determine the position of a first echo of the additional echo curve by evaluating the additional echo curve, the first echo belonging to the first track; calculate a position of the second track of the additional echo curve based on using the position of the first echo of the additional echo curve, or the position of the first track of the additional echo curve, and the first functional relationship.