RFID Indoor Positioning Based on AP Clustering and Improved Particle Swarm Algorithm

Algorithm 2

RFID indoor positioning based on AP-PSO algorithm.

Input:

1: Similarity matrix S,damping factor ,

2: Number of particles O,Weighting w,,,,;

Output: The optimal position of the particle ;

3: Divided tags area:after clustering by Algorithm 1, f clustering centers are obtained;

4: The RSSI value [] of the tag to be measured is divided into f classes based on similarity;

5: Improved PSO algorithm for location finding:

6: for each particle h do

7: Initialize velocity and position for particle h;

8: Evaluate particle h and set =

9: end for

10: = min;

11: while not stop do

12: for h to O do

13:  Update the velocity and position of particle h using the improved and ;

14:  Evaluate the particle h according to the fitness function

15: end for

16: ifthen

17:  ;

18:  ifthen

19:   ;

20:  end if

21: end if

22: end while

23: Output and get the coordinates corresponding to the RSSI value of , which is then the position of the tag to be measured.