700-SDI-RADAR-LX-80-Man Rev 1 08 Oct 2021
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IIR (Infinite Impulse Response):
This filter is used to smooth the data. When compared to a
moving average filter, the IIR filter reacts more quickly to initial changes in the data, but it
takes longer for the smoothed value to reach the new measurement. The use of the IIR filter
is discouraged for general applications. The IIR constant can be configured separately.
Moving Average:
The moving average filter calculates the average value of a number of raw
measurements. The length for the moving average filter is configured separately through the
Filter Length parameter.
Median
: The median filter finds the median value from a number of raw measurements. The length
for the median filter is configured separately through the Filter Length parameter.
Standard deviation:
This type of filter is similar to the moving average filter. It takes a number of
raw measurements (as defined by the Filter Length parameter), removes 20% of outliers,
and calculates the average of the remaining 80% of values.
Devices with firmware versions up to 2.2.8. support only No filter, IIR and Moving average. In this
case, it is recommended to use the moving average filter.
Devices with firmware versions up to 2.3.2. support No filter, IIR, Moving average and Median. For
those devices it is recommended to use moving average or median filter.
Devices with firmware versions greater than 2.3.3. support all the filters listed above. The standard
deviation filter gives the best results.
5.2.2
FILTER LENGTH
Figure 5-6: Filter Length
The length of the averaging filter, in number of readings, used to smooth the measured values. The
LX-80 performs 1 reading per second, so a filter length value of 10 will result in 10 seconds
integration time. When using longer filter lengths, more measured values are used for filtering and
the resulting data will be smoother. However, when the water level changes, it will take more time
for the new measurement to be reported. Typically, this parameter should be set to a value between
10 and 50. For highly turbulent water, a longer filter length is recommended.
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