Joint position localisation of spacecraft and debris for autonomous navigation applications using angle measurements only
Journal of Navigation
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In this paper, we consider the joint estimation of the position of a spacecraft and debris in Earth orbit so as to achieve spacecraft localization based on angular measurements and precise measurements of the debris relative to the spacecraft. The dynamic model of the spacecraft includes for several perturbing effects, such as Earth and Moon gravitational field asymmetry, the Earth's oblateness effect. The Moon’s position is assumed to be accurately known for purposes of simulation from published JPL ephemerides. The measurement process is based on the elevation and azimuth of Moon and the Sun with respect to the spacecraft reference system. Range measurements are not assumed to be available. Position and velocity of the spacecraft are estimated by using the Unscented Kalman Filter (UKF). The performance of the filters are evaluated on an example of Earth orbiting satellite at an altitude over 1200km with measurements of the directions of the Moon and the Sun only. It is shown that the estimates of position and velocity components track the corresponding simulated position and velocity components.
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