(57) ABSTRACT A method of operating an acoustic pulse echo ranging system is provided.
A series of acoustic energy pulses of successively increasing or decreasing burst …

(57) ABSTRACT A method of operating a pulse echo ranging System com prising a
transducer assembly for providing transmission and reception of high frequency energy …

A method, which allows, in an acoustic pulse-echo ranging system, the direct use of a
digitized raw echo signal for correlation-based echo distance estimation, where an acoustic …

In an acoustic pulse-echo ranging system, the transmit ter and receiver, which respectively
generate pulses of acoustic energy and receive reflections of the same, are electronically …

An interface circuit for use in connecting a high frequency piezoelectric transducer to an
input stage of an echo ranging system is described. The circuit includes first, second and …

(57) ABSTRACT A method of measuring the position of a target feature in a pulse-echo
ranging System including transmitting at least one pulse of high frequency energy from a …

(57) ABSTRACT A pulse-echo ranging system and method wherein transmit burst pulses
are transmitted to a target at a first repetition frequency, an intermediate frequency signal is …

In a method for processing an echo profile generated by a pulse-echo ranging system, the
echo profile is compared with a time-varying threshold function to identify valid echoes in …

A method for processing an echo amplitude profile generated by an echo ranging system
with reference to a temporal axis to identify return echoes comprised by the profile by …

An aim of the invention is to provide such a system whereby a liquid depth of at least the
maximum which in practice may occur in a tank, say up to twentyfive meters, can be …