研究目的

To demonstrate that, for radiated emissions from printed circuit boards (PCBs), differences exist between principal components (PCs) and independent components (ICs) in the asymptotic case of quasi-Gaussian fields, with ICs typically exhibiting simpler spatial structure than PCs.

研究成果

PCA and ICA lead to similar maps of their components when considered as spatial eigenmodes for quasi-Gaussian fields, but independent components exhibit simpler field structure than principal components. Differences between some PCs and ICs occur, typically with PC maps being a superposition of more elementary IC maps.

研究不足

The study focuses on a simple circuit to demonstrate the distinction between extracted components more clearly. For complex circuits, these differences are harder to discern because of the complexity of the emission patterns themselves. The implementation of ICA specifically excludes PCA as a preconditioning step to ICA, which may decrease computational efficiency.