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1 to 10 of 18,183 Results
The Modern Role of Visual Observations of Comets
Sep 1, 1989
Larson, S. M.; Edberg, S. J.; Levy, D. H., 1989, "The Modern Role of Visual Observations of Comets", https://hdl.handle.net/2014/35031, USA, JPL Open Repository
This paper reviews the role of past and future visual observations in cometary research. The Strengths and limitations of visual observations are explored for the benefit of both investigators who might have to use them and observers who wish to make real contributions to the fie...
Mission Analysis for Laser Interferometer Space Antenna (LISA)
Jan 1, 1992
Hechler, F.; Folkner, W. M., 1992, "Mission Analysis for Laser Interferometer Space Antenna (LISA)", https://hdl.handle.net/2014/26393, UNKNOWN, JPL Open Repository
The interplanetary orbits of three pairs of spaceprobes carrying laser interferometer antennae are designed such that their miutual distances, i.e., the lengths of the interferometer arms remain nearly constant. The pairs move relative to each other in an equilateral triangle.
Optimum Detection of Frequency-Hopped Signals
Jan 1, 1992
Cheng, Unjeng; Levitt, Barry; Polydoros, Andreas; Simon, Marvin K., 1992, "Optimum Detection of Frequency-Hopped Signals", https://hdl.handle.net/2014/36703, IEEE Transactions on Communications, JPL Open Repository
This paper derives and analyzes optimum and near-optimum structures for detecting frequency-hopped (FH) signals with arbitrary modulation in additive white Gaussian noise. The principalmodulation formats considered are M-ary frequency-shift-keying (MFSK) with fast frequency hoppi...
Smart Focal-Plane Technology for Micro-Instruments and Micro-Rovers
Jan 1, 1992
Fossum, Eric R., 1992, "Smart Focal-Plane Technology for Micro-Instruments and Micro-Rovers", https://hdl.handle.net/2014/35139, ['Workshop Proceedings - Microtechnology and Applications to Space Systems', 'Pasadena, CA'], JPL Open Repository
It is inevitable that micro-instruments and micro-rovers for space exploration will contain one or more focal-plane arrays for imaging spectroscopy or navigation. In this paper, we explore the state-if-the-art in focal-plane technology for visible sensors. Also discussed is prese...
Lunar Base Siting
Jan 1, 1992
Staehle, R. L.; Burke, J. D.; Snyder, G. C.; Dowling, R.; Spudis, P. D., 1992, "Lunar Base Siting", https://hdl.handle.net/2014/36678, UNKNOWN, JPL Open Repository
There are widely dispersed lunar sites of interest for known and potential resources, selenology and observatories. Discriminating characteristics include certain geologic and topographic features, local mineralogy and petrology, solar illumination, view of Earth and the celestri...
Validation of Special Sensor Microwave Imager Monthly-Mean Wind Speed From July 1987 to December 1989
Jan 1, 1992
Halpern, D., 1992, "Validation of Special Sensor Microwave Imager Monthly-Mean Wind Speed From July 1987 to December 1989", https://hdl.handle.net/2014/36704, Transactions on Geoscience and Remote Sensing, JPL Open Repository
Since July 1987 the Remote Sensing Systems, Santa Rosa, California, routinely computes from first principles the wind speed from Special Sensor Microwave Imager (SSM/I) measurements of the intensity of microwave radiation emitted at the ocean surface. The accuracy of monthly-mean...
An Evaluation of the National Meteorological Center Weekly Hindcast of Upper-Ocean Temperature Along the Eastern Pacific Equator in January 1992
Jan 1, 1992
Halpern, D., 1992, "An Evaluation of the National Meteorological Center Weekly Hindcast of Upper-Ocean Temperature Along the Eastern Pacific Equator in January 1992", https://hdl.handle.net/2014/36700, Journal of Climate, JPL Open Repository
The upper-ocean temperature distribution along the Pacific equator from 139 to 103 degrees west was observed in January 1992 with temperature profiles recorded from a ship and inferred from an ocean general circulation model calculation involving data assimilation (i.e., hindcast...
An Analog Processor for Image Compression
Jan 1, 1992
Tawel, R., 1992, "An Analog Processor for Image Compression", https://hdl.handle.net/2014/36710, UNKNOWN, JPL Open Repository
This paper describes a novel analog Vector Array Processor (VAP) that was designed for use in real-time and ultra-low power image compression applications. This custom CMOS processor is based architectually on the Vector Quantization (VQ) algorithm in image coding, and the hardwa...
Effect of Cooling on Boundary-Layer Stability at Mach Number 3
Jan 1, 1992
Mack, L., 1992, "Effect of Cooling on Boundary-Layer Stability at Mach Number 3", https://hdl.handle.net/2014/36709, JPL Open Repository
This paper describes the calculation of the effect of wall cooling on the instability of a two-dimensional, flat-plate supersonic boundary layer under stratospheric flight conditions at Mach 3 using both the inviscid and viscous linear stability theories.
Planetary Radar
Jan 1, 1992
Ostro, S. J., 1992, "Planetary Radar", https://hdl.handle.net/2014/36687, UNKNOWN, JPL Open Repository
Planetary radar astronomy is the study of solar system entities (the moon, asteroids, and comets, as well as the major planets and their satellites and ring systems) by transmitting radio signals towards a target and receiving and analyzing the echoes.
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