Fault tolerant UKF application in pulsar-based integrated navigation

In view of the low navigation accuracy caused by the outliers in the pulsar-based integrated navigation system, a residual orthogonal unscented Kalman filter (ROUKF) was employed to correct the outliers. During interplanetary cruise, an integrated navigation was applied which included X-ray pulsar navigation system and sun observation navigation system. The X-ray detector was used to record the arrival times of pulsar photons. The sun sensor was used to measure the sun line-of-sight vector. The information fusion was conducted by the federated filter. Simulation results demonstrate that the ROUKF in the pulsar-based integrated navigation system can effectively correct the outliers. The proposed method improves the robust capability and the application value of the pulsar-based integrated navigation system.