Engineering topics

Bayard, D. S.

Publications and source records attributed to Bayard, D. S..

At least 19 records

NASA NTRS2003

An overview of the pointing control system for NASA's Space Infra-red Telescope Facility (SIRTF)

This paper discusses the pointing control system for NASA's Space Infra-Red Telescope Facility (SIRTF). After an introduction to the SIRTF mission and telescope, an overview is given of the pointing control hardware, pointing control architecture, pointing requirements and capability, attitude constraints and commanding, attitude observers and required calibrations.

pointing control attitude estimation calibration↗

NASA NTRS2003

A high-order Kalman filter for focal plane calibration of NASA's Space Infrared Telescope Facility (SIRTF)

This paper discusses the Instrument Pointing Frame (IPF) Kalman Filter, which is an algorithm developed for focal plane calibration of NASA's Space Infrared Telescope Facility (SIRTF).

Kalman filter calibration estimation telescope↗

NASA NTRS2003

A high-order kalman filter for focal plane calibration of NASA's space infrared telescope faciligy (SIRTF)

This paper discusses the Instrument Pointing Frame (IPF) Kalman Filter algorithm for focal plane calibration of NASA's Space Infrared Telescope Facility (SIRTF).

calibration space telescope promo alignment↗

NASA NTRS2002

Dynamics of vibratory microgyroscopes

In this report we provide a vectorial derivation of the equations of motion characterizing the dynamite behavior of both ideal and non-ideal vibratory micromachined gyroscopes.

MEMS gyroscopes vibratory gyroscopes↗

NASA NTRS2002

System identification of a nonlinear flexible mode for the Shuttle Radar Topography Mission

In this paper we present the results of a study to identify a nonlinear bending mode for a 60 meter space structure.

system identification nonlinear systems large spac↗

NASA NTRS2001

Post-flight attitude reconstruction for the Shuttle Topography Mission

The Shuttle Radar Topography Mission is the first mission to provide high accuracy near-global topographic coverage of the Earth's land surface using a long-baseline interferometry approach.

attitude reconstruction interferometry mast struct↗

NASA NTRS2001

An optimization result with application to optimal spacecraft reaction wheel orientation design

This paper provides the globally optimal solution for both minimizing and maximizing the squared Frobenious norm of YQX over the class of orthogonal matrices Q.

optimization↗

NASA NTRS1998

Fast Observers for Spacecraft Pointing Control

This paper is concerned with designing fast stochastic observers for spacecraft pointing control.

pointing↗

NASA NTRS1998

Exponential Tracking Error Convergence Bounds for Overparametrized Adaptive Feedforward Systems

Many practical adaptive feedforward systems are overparametrized and for this reason will not satisfy persistent excitation (PE) conditions. For these systems, a weaker PE condition is proposed under which it is shown that the tracking error (the error between the desired and estimated outputs) converges exponentially.

confluence↗

NASA NTRS1998

An Exposure-Dependent Spacecraft Pointing Control Criteria for High Resolution Spectroscopy

Many practical adaptive feedforward systems are overparametrized and for this reason will not satisy persistent excitation (PE) conditions. For these systems, a weaker PE condition is poposed under which it is shown that the tracking error (the error between the desired and estimated outputs) converges exponentially.

adaptive↗

NASA NTRS1997

On The LTI Properties of Adaptive Feedforward Systems With Tap Delay-Line Regressors

It is shown that an adaptive system whose regressor is formed by tap delay-line (TDL) filtering of a multitone sinusoidal signal is representable as a parallel connection of a linear time-invariant (LTI) block and a linear time-varying (LTV) block.

Tap Delay-Line Regressors Time-Invariant↗

NASA NTRS1996

Exponential Convergence in Feedforward Adaptive Systems Without Persistent Excitation

Conditions are investigated for exponential convergence of the tracking error in feedforward adaptive systems without persistent excitation.

persistent excitation parameter convergence adapti↗

NASA NTRS1994

Maultivariable Plant Set Estimation Using Multisinusoidal Input Designs

A frequency domain method is developed for statistical multivariable plant set estimation. The estimation of a plant.

robust control design SIMO signal processing metho↗

NASA NTRS1994

A Globally Optimal Minimax Solution for Spectral Overbounding and Factorization

An algorithm is introduced to find a minimum phase trqansfer function of specified order whose magnitude

Spectral↗

NASA NTRS1993

Extended Horizon Liftings for Stable Inversion of Nonminimum-Phase Systems

The lifting of Lozano[9] is generalized, and shown to be one in a large class of liftings which enjoy the same zero annihilation properties (i.e., placement of transmission seros to the origin). Many useful properties of the new liftings are proved, and the results are discussed relevant to recent problems in control theory...

Lozano Lozanos lifting↗

NASA NTRS1993

Experiments in multivariable adaptive control of a large flexible structure

Explore the source record for details and available documents.

Ih, C.-H. C.↗

NASA NTRS1993

Adaptive Spacecraft Attitude Control With Application to Space Station

The attitude control problem of earth orbiting platforms is considered.

adaptive control attitude control space station mo↗

NASA NTRS1993

An Algorithm for State-Space Frequency Domain Identification Without Windowing Distrtions

An algorithm is presented for identifying state space models from frequency domain data. The main advantage of this approach is that it avoids windowing distortions associated with other frequency domain methods.

frequency domain algorithm high-order systems wide↗