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

Robust state and fault estimation for non‐linear stochastic systems with unknown disturbances: a multi‐step delayed solution

“…The FDI problem for linear and non‐linear stochastic systems with and without unknown inputs has been extensively studied (see [35, 39, 40, 42–44, 50–52]). For instance, in [52], a recursive strong tracking filter is proposed, which can produce time varying parameter estimation for non‐linear stochastic systems in the presence of coloured noises.…”

Multiple Model Adaptive Rank Estimation for Integrated Navigation During Mars Entry

“…For the sake of simplicity, there are some common assumptions for the Mars entry dynamics used in the literature (Wang, 2011;Fu et al, 2015). Those assumptions are listed as follows: 1) Mars is a spherical shape and non-rotating; 2) the Martian atmosphere is steady and non-rotating, and its density has an exponential behaviour; 3) the Mars vehicle is a point-mass vehicle with a controllable low lift-to-drag ratio.…”

“…A simplified realistic 3-DOF dynamic model of a Mars vehicle defined with respect to the Mars-centred Mars-fixed coordinate system is adopted in this Section (Li et al, 2014;Fu et al, 2015). For the sake of simplicity, there are some common assumptions for the Mars entry dynamics used in the literature (Wang, 2011;Fu et al, 2015).…”

“…However, there are three prerequisites affecting Mars entry navigation accuracy: firstly, an accurate Mars entry dynamic model; secondly, sufficient measurement data from the high precision sensors and thirdly, robust state estimation methods. From previous research (Fu et al, 2015;Lévesque, 2006), three uncertain parameters, which are Martian atmospheric density, ballistic coefficient and lift-to-drag ratio, influence the accuracy of the Mars entry dynamic model. What is more, because most sensors are blocked by the vehicle's heat shield and plasma sheath, only the IMU is available during the Mars entry phase.…”

“…The Mars Science Laboratory (MSL), whose landing ellipse is 25 km x 20 km, was launched in 2011 and landed on Mars in 2012 (Vasavada et al, 2012;Dutta and Braun, 2014). So advanced high-precision autonomous navigation and active aerodynamic lift control are essential and need to be well researched (Kozynchenko, 2011;Fu et al, 2015;Li and Peng, 2011;Hormigo et al, 2008).…”