Chapter 37 An On-Board Clock Integrity Monitoring Algorithm for Detecting Weak Anomaly Bias

摘要

As a core part of satellite payload, on-board clock has a direct influence on GNSS service performance. Therefore, it is necessary to monitor its integrity. In this paper, real-time on-board clock phase residuals are obtained by sequential least squares estimation, and a novel sum test statistic based on residuals is constructed. An integrity monitoring algorithm for on-board clock based on this test statistic is proposed. Performance of the new algorithm is analyzed and verified by simulation. The results show that the new algorithm has a perfect performance of detecting weak on-board clock anomaly bias. The integrity monitoring algorithm for on-board clock proposed in this paper is helpful to GNSS on-board clock autonomous integrity monitoring.