ASUKF based relative navigation method for mars probe using pulsar

Autonomous navigation using pulsars has the characteristics, such as stable performance, high navigation accuracy and applicable within the scope of the solar system, which is one of the effective means to realize mars probe autonomous navigation. Aiming at the problems that the relative position determination method adopted in the formation deep-space exploration task is only single one and has non-autonomous feature, a kind of autonomous relative navigation method for the transfer orbit of formation mars probe based on X-ray pulsar is proposed. In order to reduce the error of the model, the influences of the mars and earth on the relative navigation accuracy of the probe are studied. The (augmented state unscented Kalman filter, ASUKF) is introduced. The method could not only reduce the random error, but also correct the system state model error. Ground hardware-in-loop simulation experiment results show that the relative position estimation error of the method is within 30 m, which meets the autonomous relative navigation requirements of mars probe formation flight.