The Incident Field Optimization Method for the Electromagnetic Inverse Problems

Algorithm 1

Implementation steps of the IO-CSI method.

	Algorithm steps:
	1: Obtain the and by the BP method.
	2: Update using the conjugate gradient (CG) method.
	3: Update : .
	4: Update incident filed and total field in DOI.
	5: Update .
	6: If meet the terminate condition, stop iteration and output the final result; otherwise, go to step 2.