Adaptive echo threshold
US10775221B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 29, 2017 |
| Grant date | Sep 15, 2020 |
| Priority date | — |
| Expiry date | Jul 5, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S13/18
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A radar level gauge comprising transceiver circuitry configured to obtain a tank signal including a peak representing a surface echo, and at least one peak caused by a ghost echo in a neighborhood of the surface echo. The gauge further includes a tank signal filter receiving the tank signal as input and providing an echo threshold profile, the threshold profile having at least one local maximum substantially coinciding with one of the peaks in the tank signal, and processing circuitry configured to use the echo threshold profile to disregard peaks in the tank signal which are associated with ghost reflections.The filtering of the tank signal thus provides an adaptive threshold, which is aligned with the peak(s) in the tank signal. By using this threshold in the surface echo identification, at least some ghost echoes occurring in the tank signal may be disregarded.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.