Patent ID: 11914936
Assignee: WUHAN UNIVERSITY
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G

Claim 2:
3. The method according to claim 1, wherein the step of performing the LIVID on the original concentration time series to obtain the PF components and 1 residual component in step 2 comprises:
step i of obtaining all local extremum points of the original concentration time series, sequentially calculating a mean value of adjacent local extremum points, obtaining a local mean function of the mean values;
step ii of sequentially calculating an envelope estimate of adjacent local extremum points, sequentially smoothing adjacent 2 envelop estimated values to obtain an envelope estimation function;
step iii of separating the local mean function from the original concentration time series to obtain a difference function;
step iv of dividing the difference function by the envelope estimation function to obtain a division value function, treating the division function as the new input time series, repeatedly performing step i to step iii until a finally-obtained target division value function is 1 pure frequency modulation signal;
step v of multiplying all envelope estimation functions obtained in an iterative process to obtain an envelop signal;
step vi of multiplying the pure frequency modulation signal and the envelop signal to obtain a 1st PF component of the original concentration time series:
step vii of separating the 1st PF component from the original concentration time series to obtain a residual component, treating the residual component as the new original concentration time series, repeatedly performing step i to step vii until a finally-obtained target residual component is a monotonic function, obtaining the rest of the PF components and a final target residual component.