Enhancing Satellite Clock Bias Prediction Accuracy in the Case of Jumps with an Improved Grey Model

Table 1

The RMS, PE, and PE percentage improvements of statistical results of the three models.

Time	RMS (ns)			PE (m)			PE improvement (%)
	M1	M2	NM	M1	M2	NM	NM-M1	NM-M2
12 h	1.75	1.57	1.48	0.53	0.47	0.44	17.00	6.40
24 h	2.44	4.16	2.28	0.73	1.25	0.68	6.80	45.60
3 d	8.28	9.45	3.24	2.48	2.84	0.97	60.90	65.80
5 d	16.83	12.49	2.86	5.05	3.75	0.86	83.00	77.10
14 d	51.32	26.28	6.00	15.40	7.88	1.80	88.30	77.20
28 d	83.99	58.70	10.75	25.20	17.61	3.23	87.20	81.70

M1, ARMA model; M2, conventional GM(1, 1) model; NM, improved method.