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Sponsored by the Center for Science and Technology Development of the Ministry of Education
Supervised by Ministry of Education of the People's Republic of China
To reduce the computational cost, a fast position and velocity joint determination method is proposed for X-ray pulsar navigation system. Considering that the Doppler caused by the velocity of the spacecraft alters the pulse time-of-arrival (TOA), we utilize the least square method to estimate the variation of TOAs instead of the pulse profile distortion adopted by the maximum-likelihood estimation method. And then according to the variation value and TOAs, the position and velocity of spacecraft are calculated. The simulation results have demonstrated that the proposed method is far faster than the maximum-likelihood estimation method, and the accuracy of the proposed method approaches the Cramer-Rao lower bound.
Keywords:Navigation; Pulsar; Maximum likelihood; Least square method