41,881 to 41,890 of 42,318 Results
Feb 22, 1993
Bassiri, S.; Hajj, G., 1993, "Higher-Order Ionospheric Effects on the GPS Observables and Means of Modeling Them", https://hdl.handle.net/2014/34918, Pasadena, California, USA, JPL Open Repository
Based on realistic modeling of the electron density of the ionosphere and using a dipole moment approximation for the earth magnetic field, we are able to estimate the effect of the ionosphere on the GPS signal for a ground user. Our study implies reduction of the second-order io... |
Feb 22, 1993
Nandi, S.; Border, J.; Folkner, W., 1993, "Demonstration of Use of a Real Time Tone Tracker to Obtain Same Beam Interferometry Data", https://hdl.handle.net/2014/34930, ['1993 AAS/AIAA Spaceflight Mechanics Meeting', 'Pasadena, California, USA'], JPL Open Repository
The radio metric tracking technique known as Same-Beam Interferometry has been shown to improve orbit determination accuracy for the Magellan and Pioneer 12 Orbiter. |
Feb 22, 1993
Williams, B.G.; Christensen, E.J.; Yuan, D.N.; McColl, K.C.; Sunseri, R.F., 1993, "Short Arc Orbit Determination for Altimeter Calibration and Validation on TOPEX/Poseidon", https://hdl.handle.net/2014/34947, Pasadena, CA, JPL Open Repository
TOPEX/Poseidon (T/P) is a joint mission of US NASA and French CNES design launched August 10, 1992. It carries two radar altimeters which alternately share a common antenna. There are two project designated verification sites, a NASA site off the coast at Pt. Conception, CA, and... |
Feb 22, 1993
Ohsaka, K.; Trinh, E., 1993, "Development of a Versatile Electromagnetic Levitator", https://hdl.handle.net/2014/34978, ['Symposium Proceeding - Containerless Processing', 'Denver, Colorado, USA'], JPL Open Repository
A versatile electromagnetic levitator for ground-based experiments is under development at the Jet Propulsion Laboratory. |
Feb 22, 1993
Christensen, E. J.; Williams, B. G.; Yuan, D. N.; McColl, K. C., 1993, "Modeling Non-Gravitational Forces Acting on Topex/Poseidon: The Early Days", https://hdl.handle.net/2014/34948, Pasadena, California, USA, JPL Open Repository
Topex/Poseidon is a satellite mission that will use altimetry to make precise measurements of sea-level with unprecedented acuracy such that small-amplitude, basin wide sea-level with unprecedented accuracy such that small-amplitude, basin wide sea-level changes caused by large-s... |
Feb 22, 1993
Kroger, P.; Folkner, W.; Lijima, B.; Hildebrand, C., 1993, "Very-Long-Baseline-Interferometry Measurements of Planetary Orbiters at Mars and Venus", https://hdl.handle.net/2014/34928, ['AIAA, Spacefligth Mechanics', 'Pasadena, California, USA'], JPL Open Repository
Very-long-baseline interferometric measurements of the positions of planetary orbiters/landers relative to nearby extra galactic radio sources provide information on the positions of the planets in the inertial reference frame described by the measured positions of the radio sour... |
Feb 22, 1993
Thurman, S.; Estefan, J., 1993, "Radio Doppler Navigation of Interplanetary Spacecraft Using Different Data Processing Modes", https://hdl.handle.net/2014/36690, Pasadena, California, USA, JPL Open Repository
Doppler shift measurements derived from closed-loop radio tracking of distant spacecraft by ground stations of the Deep Space Network (DSN) are one of the principal means used for interplanetary navigation. |
Feb 22, 1993
Pernicka, Henry J.; Sweetser, Theodore H.; Roncoli, Ralph B., 1993, "A strategy to Rotate The Mars Observer Orbit Node Line to Advance the Mapping Schedule", https://hdl.handle.net/2014/34941, Pasadena, California, USA, JPL Open Repository
The Mars Observer (MO) spacecraft was successfully launched on September 25, 1992 and will arrive at Mars on August 24, 1993. At Mars, the spacecraft will study the planet's surface, atmosphere, and gravitational and magnetic fields. |
Feb 22, 1993
Muellerschoen, Ronald J.; Bertiger, Willy I.; Wu, Sien C., 1993, "Gravity Recovery Analysis Using GPS for STEP and a Low-Low Satellite Mission", https://hdl.handle.net/2014/34945, Pasadena, California, USA, JPL Open Repository
The precise GPS data can additionally be used to refine the Earth's gravity field. STEP is a proposed European Space Agency mission that may also carry a flight GPS receiver. |
Feb 21, 1993
Dewitte, B.; Perigaud, C.; Chao, Y., 1993, "Nino-Nina Simulations and Predictions Over 1983-1993 from Cane and Zebiak's Model and Satellite Observation", https://hdl.handle.net/2014/36560, San Diego, California, USA, JPL Open Repository
No abstract provided |