Control algorithms for aerobraking in the Martian atmosphere

Details Control algorithms for aerobraking in the Martian atmosphere Control algorithms for aerobraking in the Martian atmosphere

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991stin...9215080w&link_type=abstract

Final Report Texas A&M Univ., College Station. Aerospace Engineering Div.

Mathematics

Aerobraking, Algorithms, Computer Programs, Controllers, Liapunov Functions, Robustness (Mathematics), Trajectory Analysis, Trajectory Planning, Atmospheric Density, Computerized Simulation, Degrees Of Freedom, Dynamic Pressure, Mars Atmosphere, Mars Landing, Polynomials, Statistical Analysis

Scientific paper

The Analytic Predictor Corrector (APC) and Energy Controller (EC) atmospheric guidance concepts were adapted to control an interplanetary vehicle aerobraking in the Martian atmosphere. Changes are made to the APC to improve its robustness to density variations. These changes include adaptation of a new exit phase algorithm, an adaptive transition velocity to initiate the exit phase, refinement of the reference dynamic pressure calculation and two improved density estimation techniques. The modified controller with the hybrid density estimation technique is called the Mars Hybrid Predictor Corrector (MHPC), while the modified controller with a polynomial density estimator is called the Mars Predictor Corrector (MPC). A Lyapunov Steepest Descent Controller (LSDC) is adapted to control the vehicle. The LSDC lacked robustness, so a Lyapunov tracking exit phase algorithm is developed to guide the vehicle along a reference trajectory. This algorithm, when using the hybrid density estimation technique to define the reference path, is called the Lyapunov Hybrid Tracking Controller (LHTC). With the polynomial density estimator used to define the reference trajectory, the algorithm is called the Lyapunov Tracking Controller (LTC). These four new controllers are tested using a six degree of freedom computer simulation to evaluate their robustness. The MHPC, MPC, LHTC, and LTC show dramatic improvements in robustness over the APC and EC.

Affiliated with

Also associated with

No associations

Rating

Control algorithms for aerobraking in the Martian atmosphere does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Control algorithms for aerobraking in the Martian atmosphere, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Control algorithms for aerobraking in the Martian atmosphere will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-898947