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1 to 10 of 1,227 Results
Fiber Optic Reference Frequency Distribution to Remote Beam Waveguide Antennas
Dec 5, 1994
Calhoun, M.; Kuhnle, P.; Law, J., 1994, "Fiber Optic Reference Frequency Distribution to Remote Beam Waveguide Antennas", https://hdl.handle.net/2014/33352, ['Precise Time and Time Interval Planning Meeting', 'Reston, Virginia, USA'], JPL Open Repository
FTS support of DSS 24 for tracking unmanned spacecraft and supporting scientific experiments.
Fine-Scale Filamentary Structure in Coronal Streamers
Jan 1, 1995
Woo, R., 1995, "Fine-Scale Filamentary Structure in Coronal Streamers", https://hdl.handle.net/2014/29945, Astrophysical Journal Letters, JPL Open Repository
Doppler scintillation measurements of a coronal streamer lasting several solar rotations have been
Formal Methods Specification and Analysis Guidebook for the Verification of Software and Computer Systems Volume II: A Practitioner's Companion
Jul 14, 1997
Kelly, John C., 1997, "Formal Methods Specification and Analysis Guidebook for the Verification of Software and Computer Systems Volume II: A Practitioner's Companion", https://hdl.handle.net/2014/22415, JPL Open Repository
This volume presents technical issues involved in applying mathematical techniques known as Formal Methods to specify and analytically verify aerospace and avionics software systems.
Lunar Prospector: Gravity Mapping
Sep 26, 1997
Konopliv, A. S., 1997, "Lunar Prospector: Gravity Mapping", https://hdl.handle.net/2014/22621, USA, JPL Open Repository
Lunar Prospector, the third mission of the NASA Discovery series, is scheduled to launch Oct. 24, 1997. One of the objectives of the mission is to map the gravity field of the Moon using radiometric Doppler tracking data from JPL's Deep Space Network.
A Combined Laser-Communication and Imager for Microspacecraft (ACLAIM)
Jan 26, 1998
Hemmati, H.; Lesh, J., 1998, "A Combined Laser-Communication and Imager for Microspacecraft (ACLAIM)", https://hdl.handle.net/2014/19025, ['SPIE, Laser Communications Meeting', 'San Jose, California, USA'], JPL Open Repository
ACLAIM is a multi-function instrument consisting of a laser communication terminal and an imaging camera that share a common telescope. A single APS- (Active Pixel Sensor) based focal-plane-array is used to perform both the acquisition and tracking (for laser communication) and s...
Cosmic Collisions and the Longevity of Non-Spacefaring Galactic Civilizations
May 1, 1998
Ostro, S. H.; Sagan, C., 1998, "Cosmic Collisions and the Longevity of Non-Spacefaring Galactic Civilizations", https://hdl.handle.net/2014/19498, ['Astrodynamics and Geophysics', 'USA'], JPL Open Repository
Interplanetary collision hazards in many planetary systems force civilizations to become spacefaring or extinct. This selection pressure apparently acts on a timescale of 10***sup5*** years on Earth's current human civilization, but may act on shorter or longer timescales elsewhe...
The Impact of Autonomy Technology on Spacecraft Software Architecture
Aug 1, 1998
Gamble, E. B. Jr., 1998, "The Impact of Autonomy Technology on Spacecraft Software Architecture", https://hdl.handle.net/2014/20482, ['IEEE Expert', 'USA'], JPL Open Repository
Autonomy technology for high-level, closed-loop control of spacecraft offers considerable benefits to space-flight projects. Those benefits can enable whole new classes of missions; however, they are not without cost.
PRF Ambiguity Detrmination for Radarsat ScanSAR System
Aug 1, 1998
Jin, Michael Y., 1998, "PRF Ambiguity Detrmination for Radarsat ScanSAR System", https://hdl.handle.net/2014/34484, Pasadena, California, USA, JPL Open Repository
PRF ambiguity is a potential problem for a spaceborne SAR operated at high frequencies. For a strip mode SAR, there were several approaches to solve this problem. This paper, however, addresses PRF ambiguity determination algorithms suitable for a burst mode SAR system such as th...
Smart Executives for Autonomous Spacecraft
Aug 1, 1998
Gat, E.; Pell, B., 1998, "Smart Executives for Autonomous Spacecraft", https://hdl.handle.net/2014/20505, ['IEEE Intelligent Systems', 'USA'], JPL Open Repository
In this article we explore the design of an executive for an autonomous spacecraft. The executive is responsible for translating high-level commands, whether they come from the ground or from an on-board planner, into the low-level commands understood directly by the spacecraft h...
Deep Space One: Preparing for Space Exploration in the 21st Century
Aug 1, 1998
Nelson, R. M., 1998, "Deep Space One: Preparing for Space Exploration in the 21st Century", https://hdl.handle.net/2014/20394, ['EOS', 'USA'], JPL Open Repository
This October, NASA will take a revolutionary step with the launch of the New Millennium program's Deep Space One (DS1) mission. DS1 will fly by asteroid 1992KD in July of 1999 and will then be on a trajectory toward comet 19P/Borrelly.
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