Research Article
An RSSD-Based Fingerprint Positioning Method for Detection of an Unknown Radio Transmitter Using WLS and Factor Graph
Figure 7
Root mean square error comparison among RSSD-4NN, RSSD-FG, and proposed RSSD-WLSFG with 3 APs, 4 APs, and 5 APs, respectively, and 1.5 m grid distance.