Communications – electrical: acoustic wave systems and devices – Echo systems – Returned signal used for control
Reexamination Certificate
2007-02-20
2008-05-20
Pihulic, Daniel (Department: 3662)
Communications, electrical: acoustic wave systems and devices
Echo systems
Returned signal used for control
Reexamination Certificate
active
07376047
ABSTRACT:
Pulse-echo ranging system are used in level measurement applications for determining the distance to a target object by measuring how long after transmission of a pulse an echo pulse is received. An echo profile (17) is generated and then processed to determine the temporal position of the echo pulse on a temporal axis.Based on the fact that the peak portion and the trailing edge of the echo profile are susceptible to be affected by the measurement environment and the target object itself, the accuracy in determining the echo arrival time is increased, by the steps of fitting a branch of a parabola (19) to a selected portion of the leading edge (18) of the echo profile (17) and determining the temporal position of the fitted parabola (19) on the temporal axis.
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Brown Robert
Larocque Jean-René
Pihulic Daniel
Siemens Milltronics Process Instruments Inc.
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