Design method for filters for dynamically positioning drag suction dredger in variable-draft operational state

The present invention discloses a filter design method for the trailing suction hopper dredger one variation draft dynamic positioning job status, comprising the steps of: trailing suction hopper dredger use the data measurement system OPC standard information acquired based on acquisition and processing software and real-time transmission to the host computer; rake established state-space form of mathematical model for ships suction hopper dredger, after discretization, the vertical swing, sway, heading three degrees of freedom to design a filter, respectively; the improved Sage strong adaptive filtering algorithm and Kalman filter tracking algorithm for the filter; filter filters the position obtained after the trailing suction hopper dredger (longitudinal direction of the swing, sway direction) and a heading angle. The present invention can effectively filter the high frequency interference and noise, the estimated position of the trailing suction hopper dredger low frequency (vertical swing, sway) and heading.