Infrared interferometric observations of T Tauri stars
We present observations of several T. Tauri, stars using long baseline infrared interferometry from the Palomar Testbed Interferometer.
infrared↗
SEARCH · Search NASA
Results for “interferometric”
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.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
Demonstration of nm-Level Active Metrology for Long Range Interferometric Displacement Measurements
We report on the laboratory demonstration of an active linear metrology scheme using two separate lasers.
Active↗
Relating Vegetatin Aerodynamic Roughness Length to Interferometric SAR Measurements
UNKNOWN
soil-vegetation-atmosphere↗
Interferometric Estimation of Ice Sheet Motion and Topography
With ERS-1/2 satellite radar interferometry, it is now possible to make measurements of glacier motion with high accuracy and fine spatial resolution.
wide-area↗
Analysis of Interferometric Radar Data in a Queensland, Australia Tropical Rain Forest
NASA/JPL operates a multi-frequency full polarimetric mapping radar onboard a DC-8 aircraft.
Interferometry↗
A Comparitive Study of Interferometric Regridding Algorithm
Position vectors are not uniformly distributed in the plane following the height reconstruction process and thus need to be resampled to a uniform output grid. This process is call regridding.
Regridding↗
Interferometric Observations of Non-Maser SiO Emission from Circumstellar Envelopes of AGB Stars: Acceleration Regions and SiO Depletion
We have obtained high and medium resolution images of the SiO J=2-1 (V=0) emission from the circumstellar envelopes of three oxygen-rich Mira variables, XXyg, RX Boo, and IK Tau.
Non-Maser↗
The AIRSAR/TOPSAR Integrated Multi-Frequency Polarimetric and Interferometric SAR Processor
Research on the utility of Synthetic Aperture Radar (SAR) data in many diverse applications has seen great activity in the past decade. In particular, two powerful SAR techniques emered during this time.
polarimetric↗
Bench top interferometric test bed for LISA
Adaptive optics systems with Shack-Hartmann wavefront sensors require reconstruction of the atmospheric phase error from slope measurements, with every sensor in the array being used in the computation of each actuator command. This fully populated reconstruction matrix can result in a significant computational burden for adaptive optics systems with large numbers of actuators. A method for generating sparse wavefront reconstruction matrices for adaptive optics is proposed. The method exploits the relevance of nearby slope measurements for control of an individual actuator, and relies upon the limited extent of the influence function for a zonal deformable mirror. Relying only on nearby sensor information can significantly reduce the calculation time for wavefront reconstruction. In addition, a hierarchic controller is proposed to recover some of the global wavefront information. The performance of these sparse wavefront reconstruction matrices was evaluated in simulation, and tested on the Palomar Adaptive Optics System. This paper will present some initial results from the simulations and experiments.
LISA↗
Source Ambiguities for Imaging and Interferometric SAR
One of the greatest costs of any spaceborne mission is the total instrument mass. For SAR, one third of the mass is typically related to the antenna strucure, whose elevation and azimuth dimensions are used to increase the signal to noise ration as well as to reduce the presence of spurious signals.
SAR↗