Frequency-Extended-Space MUSIC for Positioning PIM Sources

Facing to the passive intermodulation (PIM) detection, this paper proposes the frequency-expanded-space multiple signal classification (FES-MUSIC) to break through the limitation of the sufficient antennas required in the time reversal (TR) imaging methods. The method provides only two antennas but to detect more PIM sources. Compared with the ultrawideband MUSIC (UWB-MUSIC), the proposed FES-MUSIC method performs more robustness and achieves much higher resolution.