A system and method are provided that receive a signal representing a reflection of an electromagnetic wave from a liquid and from one or more reference pins in a storage tank. A sensed distance to the liquid and one or more sensed distances to the pins are calculated from the signal, and the sensed...http://www.google.de/patents/US7891229?utm_source=gb-gplus-sharePatent US7891229 - Method and apparatus for real-time calibration of a liquid storage tank level gauge
