Autonomous navigation method based on unbiased minimum-variance estimation during Mars entry

Accurate navigation systems are required for future pinpoint Mars landing missions. A radio ranging augmented inertial measurement unit (IMU) navigation system concept is considered for the guided atmospheric entry phase. The systematic errors associated to the radio ranging and inertial measurement...

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Bibliographic Details
Published in:Advances in space research 2015-03, Vol.55 (5), p.1512-1528
Main Authors: Fu, Huimin, Yang, Yusong, Xiao, Qiang, Wu, Yunzhang, Zhang, Yongbo
Format: Article
Language:English
Subjects:
Autonomous navigation
Dynamical systems
Extension of unbiased minimum-variance
Inertial
Mars entry
Mars landing
Mars missions
Measurement systematic errors
Navigation systems
Nonlinear dynamics
Radio
Systematic errors
Unknown inputs
Velocity errors
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Summary:Accurate navigation systems are required for future pinpoint Mars landing missions. A radio ranging augmented inertial measurement unit (IMU) navigation system concept is considered for the guided atmospheric entry phase. The systematic errors associated to the radio ranging and inertial measurements, and the atmospheric mission uncertainties are considered to be unknown. This paper presents the extension of an unbiased minimum-variance (EUMV) filter of a radio beacon/IMU navigation system. In the presence of unknown dynamics inputs, the filter joins the system state and the unknown systematic error estimation of a stochastic nonlinear time-varying discrete system. 3-DOF simulation results show that the performances of the proposed navigation filter algorithm, 100m estimated altitude error and 8m/s estimated velocity error, fulfills the need of future pinpoint Mars landing missions.
ISSN:0273-1177
1879-1948
DOI:10.1016/j.asr.2014.12.020