Engineering topics
Freedman, A.
Publications and source records attributed to Freedman, A..
First p-band results using the geoSAR mapping system
GeoSAR is a program to develop a dual frequency airborne radar interferometric mapping instrument designed to meet the mapping needs of a variety of users in government and private industry.
GeoSAR: A System for Obtaining High-Resolution, True Ground Surface, Digital Elevation Models at Regional Scales
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An Overview of the GeoSAR Terrain Mapping System
By the end of this century, a new tool will be available for geologists, earthquake researchers, emergency management agencies, and forestry and land use management agencies.
GPS Data Analysis for Earth Orientation at the Jet Propulsion Laboratory
Beginning June 1992 and continuing indefinitely as part of our contribution to FLINN (Fiducial Laboratories for an International Natural Science Network), DOSE (NASA's Dynamics of the Solid Earth Program), and the IGS (International GPS Geodynamics Service), analysts at the Jet Propulsion Laboratory (JPL) have routinely been reducing data from a globally-distributed network of Rogue Global Positioning System (GPS) receivers.
Hypervelocity atomic oxygen source for the study of atom-surface interactions
Planned improvements in an electric discharge heated atomic oxygen beam source are described which will provide 6 to 7 kms(-1) beams of atomic oxygen with a flux of 10(16) cm(-2) s(-1) at 50 cm distance from the source aperture. A major advance will be the use of a zone of silence nozzle-skimmer arrangement which is necessitated by the need for high source flux and performance. It is anticipated that a Phase 2 program would provide for the fabrication of a two stage vacuum system which would be suitable for bolting on to a UHV (ultrahigh vacuum) surface study apparatus.
Hypervelocity supersonic nozzle beam source of atomic oxygen
A hypervelocity source of atomic oxygen was developed. Dissociation of molecular oxygen is accomplished by injection into a flow of helium and/or argon which has been heated in a commercial plasma torch. Atomic velocities of up to 4 kms(-1) were produced; recent improvements offer the possibility of even higher velocities. This source was utilized in studies of translational-to-vibrational energy transfer in carbon dioxide and in an investigation of the shuttle glow effect.