| OCXO | Oven-Controlled Crystal Oscillator |
| AHM | Active Hydrogen Maser |
| PID | Proportional-Integral-Derivative |
| LQG | Linear Quadratic Gaussian |
| GNSS | Global Navigation Satellite System |
| GPS | Global Position System |
| PFS | Phase, Frequency and Steers |
| KF | Kalman Filter |
| VBKF | Variational Bayesian Kalman Filter |
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