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The predictability of atomic clock is generally used to characterize its overall performance. Anomalous clock behaviors lead to greater prediction error in traditional prediction method, such as polynomial fitting predictor and Kalman filter predictor. Our previous work developed random pursuit strategy (RPS) to avoid or minimize above the problem. It was further applied to real data of three Hydrogen...
Frequency jumps are common in rubidium frequency sources. They affect the estimation of user position in navigational satellite systems. These jumps must be detected and corrected immediately as they have direct impact on the navigation system integrity. A novel weak frequency jump detector is proposed based on a Kalman filter with a multi-interval approach. This detector can be applied for both “sudden”...
This paper introduces a method of detecting atomic clock anomalies of GNSS satellites and presents some results obtained from processing real GNSS data. The method employs a Kalman filter formulation which facilitates real-time processing of GNSS carrier-phase measurements. Decision on the onset of clock anomalies is made using the prediction interval approach, where actual distribution of relative...
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