Impulsive Rendezvous Maneuvers in the Restricted Three-Body Problem

Casasco²,

AIAA Scitech 2020 Forum

2020

Self Cite

The paper describes the performance of a guidance law based on the Adjoint and SDRE methods in presence of reality representative models of sensors and actuators during the rendezvous phase of the proposed Heracles mission to the Moon. In recent years, the increased interest in returning to the Moon has motivated the necessity to develop accurate models for the analysis of missions that takes into account realistic system components. The paper reviews the mission's details, the rendezvous/berthing guidance algorithm with third body perturbation, and sensor's and actuators state of the art models. A Montecarlo analysis is used to validate the models in order to satisfy the safety of the trajectory. The results show that the proposed guidance and control are capable of maintaining safe relative motion between the vehicles.

Section: Mission Scenario Descriptionmentioning

confidence: 99%

“…7). The proposed guidance law to approach the LOP-G is composed by two different strategies, the details of which are shown in references [15] and [16]. In particular,…”

Section: Fig 6 Rendezvous Trajectorymentioning

confidence: 99%

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Realistic Guidance Performances during Lunar Rendezvous with the Third Body Perturbation

Casasco²,

AIAA Scitech 2020 Forum

2020

Self Cite

“…The guidance law used in the paper is based on the adjoint method fully described in [12]. The general concepts are presented herein for clarity's sake.…”

Section: B Adjoint Methods Theorymentioning

confidence: 99%

Ephemeris validation of Rendezvous Guidance in Lunar NRHO

AIAA Scitech 2021 Forum

2021

Self Cite

The paper proposes a comparison between the circular restricted three body problem, the elliptic restricted three body problem and an Ephemeris model for describing rendezvous and berthing manoeuvres in the presence of a non negligible third body influence. The context in which the work was developed is the autonomous rendezvous operations in Cislunar space for ESA's HERACLES mission. The purpose of the mission is to show the progress of autonomous operations in space. In particular, the paper focuses on the final part of this mission: the autonomous rendezvous between a passive vehicle on a NRHO and an active vehicle coming from the Moon surface. The work also analyzes the approaching guidance, designed under elliptic restricted three body problem hypotheses, with the Earth-Moon Ephemeris model implemented in the General Mission Analysis Tool (GMAT) by NASA.

Rendezvous in Cis-Lunar Space near Rectilinear Halo Orbit: Dynamics and Control Issues

2021

Aerospace

The paper presents the development of a fully-safe, automatic rendezvous strategy between a passive vehicle and an active one orbiting around the Earth–Moon L2 Lagrangian point. This is one of the critical phases of future missions to permanently return to the Moon, which are of interest to the majority of space organizations. The first step in the study is the derivation of a suitable full 6-DOF relative motion model in the Local Vertical Local Horizontal reference frame, most suitable for the design of the guidance. The main dynamic model is approximated using both the elliptic and circular three-body motion, due to the contribution of Earth and Moon gravity. A rather detailed set of sensors and actuator dynamics was also implemented in order to ensure the reliability of the guidance algorithms. The selection of guidance and control is presented, and evaluated using a sample scenario as described by ESA’s HERACLES program. The safety, in particular the passive safety, concept is introduced and different techniques to guarantee it are discussed that exploit the ideas of stable and unstable manifolds to intrinsically guarantee some properties at each hold-point, in which the rendezvous trajectory is divided. Finally, the rendezvous dynamics are validated using available Ephemeris models in order to verify the validity of the results and their limitations for future more detailed design.