Figure 11 4. Uncoordinated Time Transfer Using GPS
Table 11 1. Uncoordinated Time Transfer Using GPS PPS Receivers
C/A Code
P(Y) Code
Error Source
Raw
Smoothed
Raw
Smoothed
Measurements Measurements Measurements Measurements
(ns, 95%)
(ns, 95%)
(ns, 95%)
(ns, 95%)
Frequency Standard Stability
22
22
22
22
S
P
D Band Delay Variation
3
3
3
3
A
Space Vehicle Acceleration
7
7
7
7
C
Uncertainty
E
Other
3
3
3
3
C
O
Ephemeris Prediction Model
N
Implementation
27
27
27
27
T
R
O
L
Other
6
6
6
6
Ionospheric Delay
33 65
33 65
15
15
U
Tropospheric Delay
13
13
13
13
S
Receiver Noise
58
10
58
10
E
Multipath
8
8
8
8
R
Other
3
3
3
3
Position Error
144
144
144
144
T
E
O
R
Position Unknown
163 173
153 163
161
150
T
R
A
O
L
R
Position Known
78 96
52 77
72
43
The values in the table are based on Table 3 1 "GPS System Error Budget" and the smoothing of the measurements is
estimated to reduce the receiver noise by a factor of 6.
11 11
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