Laser Interferometer Tracking System Signal Processing
Algorithms for processing the LISA Laser Interferometer Tracking System (LTIS) data are presented.
LISA data↗
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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Preliminary Performance Analysis of the Space Interferometer Mission Using an Integrated Modeling Methodology
Space Interferometer Mission (SIM) scheduled for launch in 2006, is one of the premiere missions in the Origins Program, NASA's endeavor to understand the origins of the galaxies, of planetary systems around distant stars, and perhaps the origins of life itself.
integrated modeling interferometry reaction wheels↗
Automated planning for interferometer configuration and control
In this paper, we discuss artificial intelligence planning and scheduling technology and how it can be applied to interferometer configuration and control.
artificial intelligence planning scheduling sequen↗
A Common-path, Multi-channel Heterodyne Laser Interferometer for Sub-nanometer Surface Metrology
A multi-channel heterodyne laser interferometer is proposed for measurement of optical surface deformations at the sub-nanometer level.
heterodyne interferometry metrology nano-technolog↗
Damper Placement for Spaceborne Interferometers Using H(inf)-Norm, Genetic Algorithm, and Simulated Annealing, Optimization
A general methodology for damper placement in spaceborne interferometers is introduced.
Interferometry Optimization Damper Placement↗
Enabling Concepts for a Dual Spacecraft Formation-Flying Optical Interferometer for NASA's ST3 Mission
The last 15 years has seen considerable progress in the conception and development of ideas for multi-spacecraft optical interferometers.
optical interferometry formation flying spacecraft↗
Micro-Precision Interferometer: Pointing Control System
This paper describes the development of the wavefront tilt (pointing) control system for the JPL Micro-Precision Interferometer (MPI). This control system employs piezo-electric actuators and a digital imaging sensor with feedback compensation to reject errors in instrument pointing. Stringent performance goals require large feedback, however, several characteristics of the plant tend to restrict the available bandwidth. A robust 7th-order wavefront tilt control system was successfully implemented on the MPI instrument, providing sufficient disturbance rejection performance to satisfy the established interference fringe visibility.
Micro-Precision Pointing↗
Measurement of the Atmospheric Limit to Narrow-angle Interferometric Astrometry using the Mark III Interferometer
Measurements were made with the Mark III stellar interferometer in order to verify predictions for the accuracy fo very-narrow-angle interferometric astrometry. The Mark III was modified to observe simultaneously on its 12-m baseline the phase of the fringe packets of the primary and secondary of the 3.3.
Narrow-angle interferomer Mark III Stellar↗
A Common-path, Multi-channel Heterodyne Laser Interferometer for Sub-nanometer Surface Metrology
A multi-channel heterodyne laser interferometer is proposed for the JPL Thermo-Opto-Mechanical Testbed, which requires the measurement of optical surface deformations at the sub-nanometer level.
heterodyne interferometry inferometric metrology n↗
A Dual 3-Element Nulling Interferometer for TPF
We present an interferometer that provides a null at the star and a direct measurement of both visibility amplitude and phase of the planets.
Nulling Interferometry Terrestrial Planet Finder↗
The Keck Interferometer: Instrument Overview and Proposed Science
The Keck Interferometer is being developed by JPL and CARA as one of the ground-based components of NASA's Origins Program.
Optical Interferometry astrometry nulling synthesi↗
Atmospheric Fluctuation Measurements with the Palomar Testbed Interferometer
The Palomar Testbed Interferometer (PTI) has been used for several years with a 110 m baseline, at 2.2 pm observing wavelength.
optical interferometry atmospheric propagation Pal↗
Differential Astrometry with the Keck Interferometer
Among the Keck Interferometer's high priority science programs will be the differential astrometric detection of planetary companions to nearby stars.
Binary stars Palomar Testbed interferometry Keck↗
The Keck Interferometer Nuller (KIN): configuration, measurement approach, and first results
The Keck Interferometer Nuller (KIN) will be used to examine nearby stellar systems for the presence of circumstellar exozodiacal emission.
interferometry↗
Laboratory performance of the Keck interferometer nulling beam combiner
Now that regular visibility squared measurements are routinely achieved, mid-infrared nulling is the next observing mode to be implemented on the Keck Interferometer. This mode's main objective is the characterization of exo-zodiacal dust disks around nearby main sequence stars in support of the TPF space mission. Keck Nuller also shares numerious characteristics with an interferometric TPF, and will then serve as a technical precursor for this mission. We report here the results obtained in the laboratory with the KI mid-IR nulling beam combiner, which is based on a dual polarization Modified Mach Zender combiner and dispersion and achromatic nulling through zinc-selenide dielectric plates.
mid-infrared↗
An overview of the Keck Interferometer Nuller
The first high dynamic range interferometry mode planned to come on line at the Keck Observatory is mid-infrared nulling interferometry. In this paper, an overview is given of the goals and experimental configuration of the Keck Interferometer Nuller (KIN).
nulling interferometry↗
Control of systems with tiered actuators with application to interferometer optical delay line control
High accuracy feedback control systems might employ tiers of actuators with different properties. Such systems performance can be estimated in advance using Bode integrals. The systems can be made globally stable with good transient responses and close to the best possible disturbance rejection when controllers include high-order linear links and multiple nonlinear dynamic links. The design approach is exemplified by designing conb-ol system for an interferometer optical delay line.
delay line control↗
An Overview of the Formation and Attitude Control System for the Terrestrial Planet Finder Formation Flying Interferometer
The Terrestrial Planet Finder formation flying Interferometer (TPF-I) will be a five-spacecraft, precision formation operating near the second Sun-Earth Lagrange point. As part of technology development for TPF-I, a formation and attitude control system (FACS) is being developed that achieves the precision and functionality needed for the TPF-I formation and that will be demonstrated in a distributed, real-time simulation environment. In this paper we present an overview of FACS and discuss in detail its formation estimation, guidance and control architectures and algorithms. Since FACS is currently being integrated into a high-fidelity simulation environment, component simulations demonstrating algorithm performance are presented.
Scharf, Daniel P.↗