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Measurement Uncertainties of NIST Disciplined Clocks (all values are in nanoseconds)
| Uncertainty Component | Best Case (independent antenna survey, intracontinental baseline) | Worst Case (self-survey of antenna, intercontinental baseline) |
|---|---|---|
| UAN, Time Transfer Noise | 2 | 2 |
| UBA, Antenna Coordinates | 1 | 25 |
| UBC, Calibration | 5 | 5 |
| UBE, Environment | 3 | 3 |
| UBI, Ionospheric Delay | 1 | 3 |
| UBM, Multipath | 2 | 2 |
| UBD, Reference Delay | 0.5 | 0.5 |
| UBR, Resolution | 0.05 | 0.05 |
| UC, k = 2 | 13.3 | 52.0 |
