The paper describes a reference path-tracking algorithm for the compensation of the atmospheric and aerodynamic dispersion during the atmospheric entry of a low lift-to-drag interplanetary vehicle. The paper focuses on the longitudinal control. Lateral control is briefly mentioned. The algorithm follows the Embedded Model Control methodology and is based on the realtime estimation and cancellation of the causes that deviate the vehicle path from the reference trajectory. The real-time control modulates the vertical component of the lift in order to drive the vehicle fourth-order longitudinal dynamics. To simplify the control structure, longitudinal dynamics is decomposed in a series of two second-order dynamics. The upstairs dynamics (flight path angle and altitude) is commanded by the lift vertical component, the downstairs dynamics (velocity and downrange) is driven by altitude modulation. Arranging the control algorithm in a hierarchical manner becomes straightforward. Control algorithms have been tested by Monte Carlo simulations on a high fidelity six degrees-of-freedom simulator showing that the control approach provides acceptable residual dispersion at the parachute deployment point.

LONGITUDINAL PATH-TRACKING DURING ATMOSPHERIC PLANETARY ENTRY / Canuto, Enrico; Ospina, JOSE ALEJANDRO; MOLANO JIMENEZ, ANDRES GUILLERMO; Buonocore, M.. - ELETTRONICO. - (2012), pp. 8.4.1-8.4.8. ((Intervento presentato al convegno 5th International Conference on Astrodynamics Tools and Techniques (ICATT) tenutosi a Noordwijk nel 29 maggio - 1° Giugno 2012.

LONGITUDINAL PATH-TRACKING DURING ATMOSPHERIC PLANETARY ENTRY

CANUTO, Enrico;OSPINA, JOSE ALEJANDRO;MOLANO JIMENEZ, ANDRES GUILLERMO;
2012

Abstract

The paper describes a reference path-tracking algorithm for the compensation of the atmospheric and aerodynamic dispersion during the atmospheric entry of a low lift-to-drag interplanetary vehicle. The paper focuses on the longitudinal control. Lateral control is briefly mentioned. The algorithm follows the Embedded Model Control methodology and is based on the realtime estimation and cancellation of the causes that deviate the vehicle path from the reference trajectory. The real-time control modulates the vertical component of the lift in order to drive the vehicle fourth-order longitudinal dynamics. To simplify the control structure, longitudinal dynamics is decomposed in a series of two second-order dynamics. The upstairs dynamics (flight path angle and altitude) is commanded by the lift vertical component, the downstairs dynamics (velocity and downrange) is driven by altitude modulation. Arranging the control algorithm in a hierarchical manner becomes straightforward. Control algorithms have been tested by Monte Carlo simulations on a high fidelity six degrees-of-freedom simulator showing that the control approach provides acceptable residual dispersion at the parachute deployment point.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11583/2496999
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