Engineering topics
Hadaegh, F.
Publications and source records attributed to Hadaegh, F..
Optimal collision avoidance guidance for formation-flying applications
Several proposed space science missions require deployment of a number of spacecraft to form a single functional unit or a formation flying spacecraft. There are many applications of a formation flying spacecraft; variable baseline optical space interferometry is one of them.
Earth science vision: Platform technology challenges
Advanced new platform technologies are critical to the realization of the Earth Science Vision in the 2020 timeframe. Examples of the platform technology challenges and current state-of-the-art capabilities are present.
Single-Parameter Adaptation for Acquisition and Tracking
An adaptive regulator with a smoothly variable high-order linear response controlled by a single real parameter, or a regulator including a single nonlinear element, is employed in an acquisition-tracking system.
Optimal Control Strategies for Imaging Using Formation Flying Spacecraft
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Motor Control with Active Impedance of the Driver
Making the driver output impedance active allows reducing the sensitivity of the motor angular velocity to variations of the load parameters.
A Robust Control Approach for the Formation Flying of Multiple Spacecraft
We present a disturbance rejection mechanism for the formation flying of multiple spacecraft based on a robust control approach in terms of an H control problem.
Formation Flying Control of Multiple Spacecraft: Graph Theoretic Properties and Switching Schemes
We present several results on the leader-following (LF) paradigm in the formation flying of multiple spacecraft in free space.
Graphs, Matrix Inequalities, and Switching for the Formation Flying Spacecraft
We present several results on the leader-following (LF) paradigm in the formation flying of multiple spacecraft in free space.
Reconfigurable Control for the Formation Flying of Multiple Spacecraft
Several results on the reconfigurable control architecture for the formation flying of multiple spacecraft are presented.
Autonomous Sample Acquisition for Planetary and Small Body Explorations
Robotic drilling and autonomous sample acquisition are considered as the key technology requirements in future planetary or small body exploration missions.
Autonomous Landing and Smart Anchoriong for In-Situ Exploration of Small Bodies
Future NASA missions include in-situ scientific explorations of small interplanetary objects like comets and asteroids.
Nonlinear Control of the Optical Delay Line Pathlength
This paper discusses the problem of designing a control system for an interferometer delay line which contains coarse-vernier loops. The vernier loop compensator has nonlinear dynamics and includes a local feedback path containing a deadzone.
Fuel Optimiation for Constrained Rotation of Spacecraft Formations
This paper considers the problem of reorienting a constellation of spacecraft such that the fuel distributed across the constellation is both conserved and expended uniformly.
Minimum-Fuel Formation Reconfiguration of Multiple Free-Flying Spacecraft
The formation reconfiguration of multiple free-flying spacecraft is posed as an optimization problem involving minimum fuel expenditure.
System Trades Using the Asymptotic Bode-Step Method
The initial stage of a complex system design involves understanding and evaluation of various plant architecture.
Adaptive Control of Formation Flying Spacecraft for Interferometry
This paper presents an adaptive control system for coordination and control of a fleet of micro-spacecraft moving in formation.
Constellation Templates: An Approach to Autonomous Formation Flying
Multiple spacecraft flying in formation is a new paradigm that is key to the success of several future NASA missions.