Patent ID: 9494676
Filing Date: 2016-11-15
CPC Classification: G01F,G01S

Claim Text:
1. A pulse running time filling level sensor for digitizing and subsequent processing of an intermediate frequency signal for determining a filling level in a tank, comprising: a sampling device pair sampling the intermediate frequency (IF) signal at pairs of discrete points in time, the sampling device converting sampling values into sampling pairs of digital sampling values, wherein the intermediate frequency signal comprises an amplitude modulated carrier wave having an intermediate frequency; and a digital signal processing device subsequently processing of the digital sampling values through calculation of at least one characterizing value characterizing the IF signal from respectively exactly one of the digital sampling pairs, and wherein the at least one characterizing value is an envelope value, wherein the calculation of the envelope value for the respective sampling pairs is performed according to wherein: i: a non-negative integer, with i indicating respective ones of the sampling pairs; HK IF IF ta ω: angular frequency of the carrier wave.