Microwave Imaging of Three-Dimensional Targets by Means of an Inexact-Newton-Based Inversion Algorithm

Table 1

Error measures for different values of the signal-to-noise ratio and of the number of inner iterations. Homogeneous dielectric cube.

SNR	𝐿	𝑒data	𝑒RMSE	𝐾opt
∞	1	0.088	0.57	20
	2	0.06	0.54	20
	3	0.046	0.52	20
	4	0.038	0.52	20
	5	0.032	0.51	20
	10	0.027	0.51	20
30	1	0.48	0.64	20
	2	0.49	0.65	12
	3	0.48	0.65	9
	4	0.48	0.66	8
	5	0.48	0.67	8
	10	0.48	0.72	6
20	1	0.62	0.66	16
	2	0.62	0.67	11
	3	0.61	0.68	8
	4	0.62	0.68	6
	5	0.62	0.69	6
	10	0.61	0.74	6
10	1	0.87	0.73	7
	2	0.89	0.75	5
	3	0.88	0.76	4
	4	0.89	0.88	2
	5	0.88	0.81	3
	10	0.91	0.91	2