X-ray pulsar navigation using NICER-derived noise and EKF achieves sub-7 km LEO and sub-20 km interplanetary position errors with the Crab pulsar at 200 cm² effective area, but diverges after 20 days without timing updates while stable pulsars support longer autonomy at reduced precision.
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Pulsar Selection Criteria and Performance Evaluation of Autonomous X-ray Pulsar Navigation Systems
X-ray pulsar navigation using NICER-derived noise and EKF achieves sub-7 km LEO and sub-20 km interplanetary position errors with the Crab pulsar at 200 cm² effective area, but diverges after 20 days without timing updates while stable pulsars support longer autonomy at reduced precision.