Improved Hamiltonian Adaptive Control of spacecraft

Sands, Timothy; Kim, Jae Jun; Agrawal, Brij N.

doi:10.1109/aero.2009.4839565

Cited by 33 publications

(46 citation statements)

References 6 publications

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“…The classical methodologies for trajectory synthesis compare well with other nonlinear and deterministic artificial intelligence approaches such as those developed by Sands et al [11], Nakatani and Sands [12] and Baker et al [13].…”

Section: Introductionmentioning

confidence: 79%

Optimal Trajectory Synthesis and Tracking Control for Spacecraft Large Attitude Manoeuvers

Vepa¹

2020

Advances in Spacecraft Attitude Control

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The classical approach to the problem of synthesizing an optimal attitude manoeuver trajectory, involves the use of the calculus of variations and the use Lagrange multipliers or co-states. The nonlinear large attitude manoeuver trajectory is controlled by a set of nonlinear evolving co-states. In this paper, following a review of the methodologies available for trajectory synthesis followed by tracking control, the optimal trajectory for a typical optimal attitude manoeuver is synthesized by solving for the states and co-states defined by a two point boundary value problem. Gravity gradient torques are included as a matter of course. Following the synthesis of the optimal attitude-rate trajectory, tracking control laws are synthesized by re-formulating the optimal control as a feedback law. The approximate linear tracking feedback controls are evaluated by relating the optimal state and costate vector by a linear relation. The control laws are synthesized numerically. The problem of optimal attitude orientation trajectory synthesis is also addressed. The methodologies are applied to typical sample problems and results are presented. Quantitative comparisons of the results of the methods are made to the results obtained by the application of other linear and nonlinear methods, to illustrate the key features of the methodologies.

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Section: Introductionmentioning

confidence: 79%

Optimal Trajectory Synthesis and Tracking Control for Spacecraft Large Attitude Manoeuvers

Vepa¹

2020

Advances in Spacecraft Attitude Control

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“…Substantial developments in acquisitions, tracking, and fine pointing evolved in the twenty-first century and continue to this day including substantial development in target acquisition [86,89,90,[92][93][94][95][96][97], target tracking [87,88,100,101,103,106,[108][109][110][111][112][114][115][116], and fine pointing [85,98,99,102,104,105,107,113] at the Naval Postgraduate School amongst several other institutions achieving microradian pointing accuracy and closely pursuing nano-radian accuracy.…”

Section: Bifocal Relay Mirror Spacecraftmentioning

confidence: 99%

Preparing for Satellite Laser Uplinks and Downlinks

Dmytryszyn¹,

Crook²,

Sands³

2020

Sci

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The use of Light Amplification by Stimulated Emission of Radiation (i.e., LASERs or lasers) by the U.S. Department of Defense is not new and includes laser weapons guidance, laser-aided measurements, even lasers as weapons (e.g., Airborne Laser). Lasers in support of telecommunications is also not new. The use of laser light in fiber optics shattered thoughts on communications bandwidth and throughput. Even the use of lasers in space is no longer new. Lasers are being used for satellite-to-satellite crosslinking. Laser communication can transmit orders-of-magnitude more data using orders-of-magnitude less power and can do so with minimal risk of exposure to the sending and receiving terminals. What is new is using lasers as the uplink and downlink between the terrestrial segment and the space segment of satellite systems. More so, the use of lasers to transmit and receive data between moving terrestrial segments (e.g., ships at sea, airplanes in flight) and geosynchronous satellites is burgeoning. This manuscript examines the technological maturation of employing lasers as the signal carrier for satellite communications linking terrestrial and space systems. The purpose of the manuscript is to develop key performance parameters (KPPs) to inform U.S. Department of Defense initial capabilities documents (ICDs) for near-future satellite acquisition and development. By appreciating the history and technological challenges of employing lasers rather than traditional radio frequency sources for satellite uplink and downlink signal carriers, this manuscript recommends ways for the U.S. Department of Defense to employ lasers to transmit and receive high bandwidth, large-throughput data from moving platforms that need to retain low probabilities of detection, intercept, and exploitation (e.g., carrier battle group transiting to a hostile area of operations, unmanned aerial vehicle collecting over adversary areas). The manuscript also intends to identify commercial sector early-adopter fields and those fields likely to adapt to laser employment for transmission and receipt.

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“…In addition, to simplify the vehicle's model and therefore to avoid complicated mathematical calculations, the following assumptions similar to [11] are made in the vehicle modeling, where [14] describes deterministic artificial intelligence methods to deal with coupled disturbances. Preliminary research in overcome linear coupling is contained in [15], while methods to counter angular coupling is described in [16], following an established lineage of continuing research from [17][18][19][20][21][22][23].…”

Section: Hydrodynamic Damping Term F Dragmentioning

confidence: 99%

“…In the case α ∈ [0 • , 90 • ), it has F A = 2F max and if α ∈ [180 • , 270 • ) then F A = −2F max . Therefore, (22) can be rewritten as…”

Section: Lemmamentioning

confidence: 99%

UUV Simulation Modeling and its Control Method: Simulation and Experimental Studies

Kim

Kang

et al. 2019

JMSE

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This paper presents the development of an unmanned underwater vehicle (UUV) platform, especially the derivation of the vehicle's simulation model and its control method to overcome strong sea current. The platform is designed to have a flattened ellipsoidal exterior so as to minimize the hydrodynamic damping on the horizontal plane. Four horizontal thrusters with the identical specifications are symmetrically mounted on the horizontal plane, and each of them has the same thrust dynamics in both forward and reverse directions. In addition, there are three vertical thrusters used to handle the vehicle's roll, pitch and heave motions. Control strategy proposed in this paper to overcome strong current is that: maximizing the vectored horizontal thrust force against the sea current without or with the least of the vehicle's rotation on the horizontal plane. For the vehicle model, due to it being symmetric in all of three axes, the vehicle dynamics can be simplified and all of hydrodynamic coefficients are calculated through both of theoretical and empirically-derived formulas. Numerical simulations and experimental studies in both of the water tank and the circulating water channel are carried out to demonstrate the vehicle's capability of overcoming strong current.

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Improved Hamiltonian Adaptive Control of spacecraft

Cited by 33 publications

References 6 publications

Optimal Trajectory Synthesis and Tracking Control for Spacecraft Large Attitude Manoeuvers

Optimal Trajectory Synthesis and Tracking Control for Spacecraft Large Attitude Manoeuvers

Preparing for Satellite Laser Uplinks and Downlinks

UUV Simulation Modeling and its Control Method: Simulation and Experimental Studies

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