Ecotech Serinus 44 - Kalman Filter Theory; Figure 2 - NH 3 Calculation

Introduction
Page 23
Figure 2 – NH
3
Calculation
1.4.2 Kalman Filter Theory
The digital Kalman filter provides an ideal compromise between response time and noise reduction
for the type of signal and noise present in ambient air instruments.
The Kalman filter enhances measurements by modifying the filter time base variable, depending on
the change rate of the measured value. If the signal is changing rapidly, the instrument is allowed to
respond quickly. When the signal is steady, a long integration time is used to reduce noise. The
system continuously analyses the signal and uses the appropriate filtering time.