Aanderaa ZPulse DCS 4420 - Page 37

February 2020 – TD 266 OPERATING MANUAL – ZPulse® DCS 4420/4830/4520/4930 Page 37
The transmitted pulse gives backscatter from a 0.75m long
area after transmission.
The pulse propagates away from the sensor giving
backscatter further away from a 0.75m area. A 0.4m start
distance means that the DCS starts to measure the
backscattered signal while the pulse gives backscatters
from 0.4m to 0.4+0.75=1.15m area away from the sensor.
The sensor measures the backscattered signal while the
pulse propagates a distance equal to the selected cell size.
In this example the cell size is equal to the pulse length, i.e.
the sensor measures the backscattered signal while the
pulse propagates 0.75m further away.
The sensitivity is greatest at the center of the cell, i.e. the
area close to the center of the cell gives more backscatter
energy. The measurement area outside the cell gives very
little contribution to the measured Doppler frequency shift.
Figure 2-20: Illustration of Pulse, Cell and the Measurement area.
The Measurement Area is defined as:
sizeCellLengthPulse +
The Cell Start is defined as:
2
LengthPulse
ancedistStart +
The Cell End is defined as:
sizeCellstartCell +
The Cell Centre is defined as:
2
SizeCellLengthPulse
nceadistStart
+
+
Enable ZPulse Operation. Activate/deactivate ZPulse operation; Set yes to activate. Default value is yes. ZPulse
operation gives two separate frequencies in each ping and therefor higher quality data without increasing power
consumption