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Accuracy Analysis of Constellation Orientation Parameters Determination via X-Ray Pulsar Measurement

Pulsars are rapidly rotating, highly magnetized neutron stars that produce stable and predictable signatures. It can provide an external spatial reference to determine constellation orientation parameters. Based on the pulsar relative observation model and inter-satellite range model, Posterior Cramer-Rao Lower Bound (PCRLB) method is utilized to acquire orientation parameters accuracy in theory. Three factors, which are baseline, delta time of arrival (DTOA) estimation accuracy and directional angle, affecting the directional angle accuracy are analyzed in theory and simulation.