Efficient Method of Firing Angle Calculation for Multiple Launch Rocket System Based on Polynomial Response Surface and Kriging Metamodels

Table 4

Effect of the correlation function of Kriging on prediction accuracy of firing angle.

Correlation function	Firing angle			Range
	MAE (mil)	MRE (%)	RMSE (mil)	MAE (m)	MRE (%)	RMSE (m)
Cubic	0.809	0.080	0.099	286.63	0.108	51.45
Exp	2.242	0.223	0.227	664.52	0.250	85.75
Gauss	0.865	0.083	0.084	243.33	0.094	39.71
Linear	2.426	0.233	0.233	674.98	0.262	93.47
Matern32	1.667	0.161	0.150	465.00	0.180	60.81
Matern52	1.192	0.115	0.121	332.74	0.152	53.66
Spherical	2.330	0.224	0.221	649.45	0.251	83.96
Spline	0.738	0.074	0.087	262.95	0.103	44.97