Initialization Analysis of IIR Ground Clutter Filter in Doppler Weather Radar

This paper analyzes the initialization of IIR ground clutter filter (GCF) in Doppler weather radar. The transients of IIR GCF degrade the theoretical frequency response and different initialization technique produces different suppression characteristic. The initialization performance is tested both with a simulated weather radar signal and an actual weather radar signal. We explore the relation between clutter suppression ratio (the power of the unfiltered signals to the power of the filtered signals) and number of samples. Through simulations, the results demonstrate that the suppression characteristic of step-initialized and projection-initialized IIR GCF each has its advantage and you can choose as you need.