Patent ID: 8186214

Claim:
A method for determining a liquid level of a liquid within a specified measuring range, the method comprising the steps of: transmitting radar signals toward a surface of the liquid in time sequence; receiving radar signals reflected from the liquid surface in time sequence; and determining the liquid level based on the transmitted radar signals and the reflected radar signals by: simultaneously carrying out two different calculation methods, wherein a first of the calculation methods generates a first measured value of the liquid level with a first error and a second of the calculation methods generates a second measured value of the liquid level with a second error, wherein the first calculation method is more sensitive to systematic deviations than the second calculation method, and wherein the second calculation method is more sensitive to strong fluctuations in the liquid level than the first calculation method; analyzing fluctuations in the liquid level in time sequence; and using one of the first and second measured values as the determined liquid level based on the fluctuations in the liquid level.