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Browsing JPL Technical Report Server by Issue Date

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Now showing items 41-60 of 36386

Use of Earth Gravity Assist for Near-Eaarth Asteroid Mission

Penzo, P. A. (1992-08)
The Starburst-AGN Connection: A Sensitive VLBI Survey of Luminous IRAS Galaxies

Lonsdale, Colin J.; Smith, Harding E.; Lonsdale, Carol J. (1992-09-08)

Results of an 18 cm VLBI survey of 31 luminous (L_(fir) greater than 10^(11.25)L dot circle),radio-compact (theta less than approximately 0."25) infrared galaxies are presented. Over half thesample galaxies show high-brightness ...
Evolving Directions in NASA's Planetary Rover Requirements and Technology

Weisbin, C.; Montemerlo, M.; Whittaker, W. (1992-09-28)

This paper describes the evolution of NASA's planning for planetary rovers and some of the technology that has been developed to achieve the desired capabilities.
The Scattering and Acceleration of Water Group Ions Due to Oblique Nonlinear Magnetosonic Waves: With Application to Comets

Srivastava, Krishna M.; Bruce T. Tsurutani; Goldstein, Bruce E.; Sharma, V.; Okada, M. (1992-10)

The Observations made during the encounter with comet Giacobini Zinner show that close to the bow shock the character of MHDd turbulence is govered by the Magnetosonic waves generated by the pickup ions via a resonant ...
Measurement And Simulation of Signal Fluctuations Caused By Propagation Through Trees

Durden, Stephen L.; Klein, Jeffrey D.; Zebker, Howard A. (1992-10-15)

We present measured fluctuations of UHF, L-band, and C-band signals that were transmitted from the ground through a forest canopy to an airborne radar. By use of a transmitter in the open, we are able to derive both ...
Interferometric Observations of Non-Maser SiO Emission from Circumstellar Envelopes of AGB Stars: Acceleration Regions and SiO Depletion

Sahai, R.; Bieging, J.H. (1992-10-16)

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.
Situation Management in the Link Monitor and Control Operator Assistant (LMCOA)

Jr., Randall W. Hill; Lee, Lorrine F. (1992-11)

This paper describes a knowledge-based system called the Situation Manager that was developed for the Link Monitor and Control Operator Assistant (LMCOA) at the Jet Propulsion Laboratory. This system was developed in ...
An OSI Architecture for the Deep Space Network

Heuser, W. Randy; Cooper, Lynne P. (1992-11)

The flexibility and robustness of a monitor and control system are a direct result of the underlying inter-processor communications architecture. A new architecture for monitor & control at the Deep Space Network ...
Control /Structure Interaction Technology for the Microdynamic Regime

Laskin, R. A. (1992-11)

The CSI program at JPL is chartered to develop the structures and control technology needed for sub-micron level stabilization of future optical space systems.
Spacecraft Cooler Characterization

Johnson, D. L.; Mon, G. R.; Rodd, R. G. Jr. (1992-11)

To meet an important need within the space community for a reliable and accurate database of cryocooler performance, the Jet Propulsion Laboratory (JPL), under SDIO/Air Force Sponsorship, is conducting an extensive space ...
optical Instruments for Remote Sensing from Space

Chrisp, Michael P. (1992-11)

This review covers the optical design of passive remote sensing optical instruments. The review concentrates on the design of spaceborne multispectral cameras and imaging spectometers. The major designs that have been ...
LinkWinds: An Approach to Visual Data Analysis

Jacobson, Allan S. (1992-11)

The Linked Windows Interactive Data System (LinkWinds) is a prototype visual data exploration and analysis system resulting from a NASA/JPL program of research into graphical methods for rapidly accessing, displaying and ...
Optimal estimation of rain rate profiles from single-frequency radar echoes.

Haddad, Ziad S.; Im, Eastwood (1992-11-03)

The significant ambiguities inherent in the determination of a particular vertical rain intensity profile from a given time profile of radar echo powers measured by a downward-looking (spaceborne or airborne) radar at a ...
User Scientific Data Systems: Experience Report

Dobinson, Elain R. (1992-11-05)

This paper presents an abbreviated history of NASA science data management system development over the past ten years by selecting two case studies, each representative of a distinct era of science data management systems.
Representing Operations Procedures Using Temporal Dependency Algorithms

Fayyad, K.; Cooper, L. (1992-11-16)

The research presented in this paper is investigating new ways of specifying operations procedures that incorporate the insight of operations, engineering, and science personnel to improve mission operations. The paper ...
A MOS for All Seasons

Bryant, L. (1992-11-17)

From a systems perspective, this paper examines the challenges of a single system to support multiple Jet Propulsion Laboratory (JPL) space exploration missions and the need for unitary responsibility for the system.
Using the SPICE System to Help Plan and Interpret Space Science Observations

Jr., Charles H. Acton (1992-11-17)

A portable multimission information system named SPICE is used to assemble, archive, and provide easy access to viewing and other ancillary information needed by space scientists to interpret observations of bodies within ...
Deep Space Network Antennas

Mathison, R.P. (1992-11-22)
Multi-Beam Range Imager for Autonomous Operations

Marzwell, N. I.; Lee, H. S.; Ramaswami, R. (1992-12)

For space operations using Space Station Freedom, the real-time range imager will be very valuable in terms of refueling and docking, as well as space exploration.
Deflection and Fragmentation of Near-Earth Asteroids

Ahrens, Thomas J.; Harris, Alan W. (1992-12)

Collisions by near-earth asteroids or the nuclei of comets pose varying levels of threat to man. A relatively small object, approximately 100 m diameter, which might be found on an impact trajectory with a populated region ...

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