SEARCH · Engineering Papers
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.
In this paper, a brief review is given of NASA's outer planet missions as performed with chemical propulsion systems. The Kuiper Express is discussed as an illustration of the integrated approach that should be used in mission and spacecraft design to maximize science return.
Explore the source record for details and available documents.
Explore the source record for details and available documents.
A new laser-based optical sensor system that provides hazard detection for planetary rovers is presented. It is anticipated that the sensor can support safe travel at speeds up to 6cm/second for large (1m) rovers in full sunlight on Earth or Mars. The system overcomes limitations in an older design that require image differencing ot detect a laser stripe in full sun.
Recent progress in our understanding of electron density fluctuations observed by radio occultation measurements has demonstrated that a break in the vicinity of 1 Hz in the temporal frequency spectrum of the density fluctuations provides a measure of the size of the finest filamentary structures in the solar corona.
ISEE-3 and Ulysses plasma and magnetic field data are used to study features in the trailing regions of interplanetary plasma clouds resulting from coronal mass ejections (CMEs). Approximately one quarter of those events contain periods greater or equal to 6 hours for which the interplanetary magnetic field is quiet and nearly radial. Arguments are presented that this is a causal relation, rather than coincidence.
Explore the source record for details and available documents.
Explore the source record for details and available documents.
FFT is a well known technique for frequency estimation. Similarly, adaptive line enhancer can.
Use of the UCLA CONQUEST (CONtent-based Querying in Space and Time) is reviewed for performance of automatic cyclone extraction and detection of spatio-temporal blocking conditions on MPP. CONQUEST is a data analysis environment for knowledge and data mining to aid in high-resolution modeling of climate modeling.
Explore the source record for details and available documents.
Explore the source record for details and available documents.
In this paper, we present a new technique for faster than real time estimation for height from altimeter waveforms using modest computer resources.
In an effort to complete the initial reconnanissance of our solar system, the Jet Propulsion Laboratory (JPL) is designing a mission to send two very small spacecraft to explore Pluto and its moon, Charon.
Pluto is the only planet in our solar system not yet visited by our spacecraft. Recent observations through the Hubble Space Telescope have given us a glimpse of Pluto and it's moon Charon, but their small size and immense distance from earth have preserved their mystery.
The present spacecraft transponder acquires and tracks the uplink carrier signal by using a phase locked loop (PLL).
Explore the source record for details and available documents.
Explore the source record for details and available documents.