Backup Hydrogen Maser Steering System for Galileo Precise Timing Facility

Table 1

Overall performance budget.

	Test case	1	2	3	4	5
Algorithm simulation	Test event	Nominal	Phase/frequency spikes	Phase jump of 30 ps (GST(MC) maximum phase jump)	Frequency jump of 1e-14(GST(MC) maximum frequency correction)	Frequency drift of 1e-13/𝑑(10 times worse of HM specification)
	Peak phase offset	4 ps	4 ps	8 ps	6.3 ps	27 ps
Calibration accuracy		5 ps
MCPC resolution		0.1 ps
PicoStepper resolution		0.1 ps
Total (phase offset)		6.4 ps	6.4 ps	9.4 ps	8 ps	27.5 ps