Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011acasn..52..251z&link_type=abstract
Acta Astronomica Sinica, vol. 52, no. 3, p.251-259
Astronomy and Astrophysics
Astrophysics
X-Ray: Pulsars, Equation Of State, Space Vehicles, Methods: Data Analysis
Scientific paper
Pulsar can be used as time standard because of its very stable rotation. The astrometric parameters and astrophysical parameters such as the space position, proper motion, distance, rotation period and its derivative of many pulsars can be measured accurately. Pulsars can provide time signal and space position coordinate, so spacecraft can realize autonomous navigation by pulsar navigation system fixed on spacecraft. Firstly, spacecraft position is predicted based on orbital dynamical equations of spacecraft. Secondly, the difference between the observed time of arrival (TOA) on spacecraft and the predicted TOA with the model is calculated. Thirdly, the estimated position error is calculated by using Kalman filter and the position of spacecraft is modified. Finally, the influence of initial position error, the measured precision of TOA of pulse and the number of pulsars on navigation precision is analyzed.
Nian Feng
Yang Jaek-Jin
Zhang Lianchang
Zong C. X.
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