TABLE 1

URE Ranges for 1-m Error Components for an SV at GPS Altitude

Component(s)FigureMinimum Instantaneous SIS URE (m)Maximum Instantaneous SIS URE (m)
Radial3 a0.9711.000
Along-track3 b−0.2400.240
Cross-track3 c−0.2400.240
Clock3 d−1.000−1.000
Radial + Along-track4 a0.7291.211
Radial + Cross-track4 b0.7291.211
Radial + Clock4 c−0.0290.000
Along-track + Cross-track4 d−0.3400.340
Along-track + Clock4 e−1.240−0.760
Cross-track + Clock4 f−1.240−0.760