Echo Processing; Tvt (Time Varying Threshold) Curves; A.2 Echo Processing - Siemens HydroRanger 200 HMI Operating Instructions Manual

Technical reference

A.2 Echo processing

A.2

Echo processing

Echo processing consists of echo enhancement, true echo selection, and selected echo
verification.
Echo Enhancement is achieved by filtering
(echo reflected by the intended target) is selected when that portion of the echo profile meets
the evaluation criteria of Sonic Intelligence. Insignificant portions of the echo profile outside
of the measurement range
and short shot floor
profile are evaluated using algorithm
ing the best echo confidence
True echo verification is automatic. The position (relation in time after transmit) of the new
echo is compared to that of the previously accepted echo. When the new echo is within the
echo lock window
fuzz filter
ed until echo lock requirements are satisfied.
1)
2)
3)
4)
(2.11.3.7.) (Page 230), TVT ms (2.11.3.8.) (Page 231), TVT Slope Minimum (2.11.3.9.)
(Page 231)
5)
6)
7)
8)
9)
10)
11)
12)
Indicator (2.3.9.) (Page 176) and Emptying Indicator (2.3.10.) (Page 176)
13)
A.3

TVT (time varying threshold) curves

A TVT curve describes a threshold below which any echoes will be ignored. The default TVT
curve is used, until Auto false echo suppression (2.11.3.2.) (Page 227) and Auto false echo
suppression range (2.11.3.3.) (Page 228) are used to create a new 'learned TVT curve'.
302
3)
, are automatically disregarded. The remaining portions of the echo
6)
, it is accepted and displays, outputs, and relays are updated per the
10)
and rate parameters
11)
Narrow Echo Filter (2.11.2.6.) (Page 224) and Spike Filter (2.11.2.7.2.) (Page 224)
Reform Echo (2.11.2.5.) (Page 223)
Span (2.2.2.) (Page 169) + Range Extension (2.2.7.) (Page 172)
TVT Type (2.11.3.6.) (Page 230), TVT Shaper (2.11.4.) (Page 231), TVT dB
Long Echo Threshold (2.11.2.3.) (Page 223)
Short Shot Floor (2.11.2.11.) (Page 226)
Algorithm (2.11.2.2.) (Page 222)
Short Shot Bias (2.11.2.10.) (Page 225)
Long Confidence (3.2.11.2.) (Page 262)
Echo Lock Window (2.11.5.5.) (Page 235)
Fuzz Filter (2.11.5.6.) (Page 236)
Fill Rate/minute (2.3.2.) (Page 173), Empty Rate/minute (2.3.3.) (Page 173), Filling
Echo Lock (2.11.5.4.) (Page 235)
and reforming
1)
, below the TVT curve
4)
and short shot bias
7)
is selected.
9)
. If the new echo is outside of the window, it is not accept-
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the echo profile. The true echo
2)
, and less than the confidence threshold
. The echo profile portion provid-
8)
Operating Instructions, 06/2018, A5E36281317-AC
5)
HydroRanger 200 HMI