TECHNICAL REFERENCE
TRANSMIT PULSE
The HYDRO+ transmit pulse consists of one or more electrical "shot" pulses, which
are supplied to the Transducer connected to the HYDRO+ terminals.
The transducer fires an acoustic "shot" for each electrical pulse supplied. After each
shot is fired, sufficient time is provided for
echo
(shot reflection) reception, before the
next (if applicable) shot is fired. After all shots of the transmit pulse are fired, the
resultant echoes are processed.
The transmit pulse shot number, frequency, duration, delay, and associated
measurement range are defined by parameters P803 and P840 to P852.
ECHO PROCESSING
Echo processing consists of echo enhancement, true echo selection, and selected
echo verification.
Echo Enhancement is achieved by
filtering
(P821 and P822) and
reforming
(P823) the
echo profile
(P810).
The
true echo
(echo reflected by the intended target) is selected when that portion of
the echo profile meets the evaluation criteria of Sonic Intelligence
TM
.
Insignificant portions of the echo profile outside of the measurement range (Span
P006 + Range Extension P801), below the TVT Curve (P830, and P832 to P835), and
less than the Confidence Threshold (P804) and Short Shot Floor (P851) are
automatically disregarded.
The remaining portions of the Echo Profile are evaluated using the Algorithm (P820)
and Short Shot Bias (P850). The Echo Profile portion providing the best Echo
Confidence (P805), is selected.
True echo verification is automatic. The position (relation in time after transmit) of the
"new" echo, to the previously accepted echo position, is compared. When the new
echo is within the Echo Lock Window (P713), it is accepted and displays, outputs, and
relays are updated per the Fuzz Filter (P710) and Rate Parameters (P700 to P703). If
the new echo is outside of the Echo Lock Window, it is not accepted until
Echo Lock
(P711) requirements are satisfied.
SCOPE DISPLAYS (P810)
Span ( P007 ) +
Range Extension (801)
Echo Lock
Window
TVT Curve
Echo Profile
Near Blanking
( P800 )
msec x 100
TECHNICAL REFERENCE
PL-507 149
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