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1. (WO2019063651) ADAPTIVE ECHO THRESHOLD
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Pub. No.: WO/2019/063651 International Application No.: PCT/EP2018/076191
Publication Date: 04.04.2019 International Filing Date: 26.09.2018
IPC:
G01F 23/284 (2006.01) ,G01S 7/292 (2006.01) ,G01S 7/35 (2006.01) ,G01S 7/41 (2006.01) ,G01S 13/88 (2006.01)
G PHYSICS
01
MEASURING; TESTING
F
MEASURING VOLUME, VOLUME FLOW, MASS FLOW, OR LIQUID LEVEL; METERING BY VOLUME
23
Indicating or measuring liquid level, or level of fluent solid material, e.g. indicating in terms of volume, indicating by means of an alarm
22
by measurement of physical variables, other than linear dimensions, pressure, or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
28
by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
284
Electromagnetic waves
G PHYSICS
01
MEASURING; TESTING
S
RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
7
Details of systems according to groups G01S13/, G01S15/, G01S17/127
02
of systems according to group G01S13/58
28
Details of pulse systems
285
Receivers
292
Extracting wanted echo-signals
G PHYSICS
01
MEASURING; TESTING
S
RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
7
Details of systems according to groups G01S13/, G01S15/, G01S17/127
02
of systems according to group G01S13/58
35
Details of non-pulse systems
G PHYSICS
01
MEASURING; TESTING
S
RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
7
Details of systems according to groups G01S13/, G01S15/, G01S17/127
02
of systems according to group G01S13/58
41
using analysis of echo signal for target characterisation; Target signature; Target cross-section
G PHYSICS
01
MEASURING; TESTING
S
RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
13
Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
88
Radar or analogous systems, specially adapted for specific applications
Applicants:
ROSEMOUNT TANK RADAR AB [SE/SE]; Box 150 435 23 MÖLNLYCKE, SE
Inventors:
BLOMBERG, Urban; SE
LARSSON, Lars-Ove; SE
DELIN, Håkan; SE
Agent:
AWA SWEDEN AB; Box 11394 404 28 GÖTEBORG, SE
Priority Data:
15/720,05429.09.2017US
Title (EN) ADAPTIVE ECHO THRESHOLD
(FR) SEUIL D'ÉCHO ADAPTATIF
Abstract:
(EN) 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.
(FR) Cette invention concerne une jauge de niveau à radar, comprenant un circuit émetteur-récepteur configuré pour obtenir un signal de réservoir comprenant un pic représentant un écho de surface, et au moins un pic provoqué par un écho fantôme dans un voisinage de l'écho de surface. La jauge comprend en outre un filtre de signal de réservoir recevant le signal de réservoir en tant qu'entrée et fournissant un profil de seuil d'écho, le profil de seuil ayant au moins un maximum local coïncidant sensiblement avec l'un des pics dans le signal de réservoir, et un circuit de traitement configuré pour utiliser le profil de seuil d'écho pour ignorer les pics dans le signal de réservoir qui sont associés à des réflexions fantômes. Le filtrage du signal de réservoir fournit ainsi un seuil adaptatif, qui est aligné avec le(s) pic(s) dans le signal de réservoir. En utilisant ce seuil dans l'identification d'écho de surface, au moins certains échos fantômes se produisant dans le signal de réservoir peuvent être ignorés.
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Designated States: AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DJ, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, JO, JP, KE, KG, KH, KN, KP, KR, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW
African Regional Intellectual Property Organization (ARIPO) (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Office (AM, AZ, BY, KG, KZ, RU, TJ, TM)
European Patent Office (EPO) (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG)
Publication Language: English (EN)
Filing Language: English (EN)