Results 51 to 60 of about 201,777 (208)

Ionospheric refraction effects on orbit determination using the orbit determination error analysis system [PDF]

open access: yes
The influence of ionospheric refraction on orbit determination was studied through the use of the Orbit Determination Error Analysis System (ODEAS). The results of a study of the orbital state estimate errors due to the ionospheric refraction corrections,
Dunham, J. B.   +4 more
core   +1 more source

An independent determination of Fomalhaut b's orbit and the dynamical effects on the outer dust belt [PDF]

open access: yes, 2013
The nearby star Fomalhaut harbours a cold, moderately eccentric dust belt with a sharp inner edge near 133 au. A low-mass, common proper motion companion (Fom b), was discovered near the inner edge and was identified as a planet candidate that could ...
Augereau, Jean-Charles   +9 more
core   +7 more sources

Enhanced Real-Time Onboard Orbit Determination of LEO Satellites Using GPS Navigation Solutions with Signal Transit Time Correction

open access: yesAerospace
Enhanced real-time onboard orbit determination for low-Earth-orbit satellites is essential for autonomous spacecraft operations. However, the accuracy of such systems is often limited by signal propagation delays between GPS satellites and the user ...
Daero Lee, Soon Sik Hwang
doaj   +1 more source

Evaluation of the IMP-16 microprocessor orbit determination system filter [PDF]

open access: yes
The results of the numerical tests performed in evaluating the interplanetary monitoring platform-16 orbit determination system are presented. The system is capable of performing orbit determination from satellite to satellite tracking data in ...
Shenitz, C. M., Tasaki, K. K.
core   +1 more source

Angles-only relative orbit determination in low earth orbit

open access: yesAdvances in Space Research, 2018
Abstract The paper provides an overview of the angles-only relative orbit determination activities conducted to support the Autonomous Vision Approach Navigation and Target Identification (AVANTI) experiment. This in-orbit endeavor was carried out by the German Space Operations Center (DLR/GSOC) in autumn 2016 to demonstrate the capability to perform
Ardaens J. -S., Gaias G.
openaire   +3 more sources

Spin effects in the phasing of gravitational waves from binaries on eccentric orbits [PDF]

open access: yes, 2010
We compute here the spin-orbit and spin-spin couplings needed for an accurate computation of the phasing of gravitational waves emitted by comparable-mass binaries on eccentric orbits at the second post-Newtonian (PN) order.
Jetzer, Philippe, Klein, Antoine
core   +1 more source

High-precision GPS orbit determination by integrating the measurements from regional ground stations and LEO onboard receivers

open access: yesSatellite Navigation
High-precision Global Navigation Satellite System (GNSS) orbit and clock products are crucial for precise applications. An evenly distributed global network enables continuous tracking for GNSS satellites, while a regional network may result in tracking ...
Kai Li   +4 more
doaj   +1 more source

Ionospheric refraction effects on TOPEX orbit determination accuracy using the Tracking and Data Relay Satellite System (TDRSS) [PDF]

open access: yes
This investigation concerns the effects on Ocean Topography Experiment (TOPEX) spacecraft operational orbit determination of ionospheric refraction error affecting tracking measurements from the Tracking and Data Relay Satellite System (TDRSS).
Doll, C. E., Radomski, M. S.
core   +1 more source

Zero kinetic energy-pulsed field ionization and resonance enhanced multiphoton ionization photoelectron spectroscopy: Ionization dynamics of Rydberg states in HBr [PDF]

open access: yes, 1996
The results of rotationally resolved resonance enhanced multiphoton ionization photoelectron spectroscopy and zero kinetic energy‐pulsed field ionization studies on HBr via various rotational levels of the F^ 1Δ_2 and f^ 3Δ_2 Rydberg states are reported.
Buma, W. J.   +5 more
core   +2 more sources

Automation of orbit determination functions for National Aeronautics and Space Administration (NASA)-supported satellite missions [PDF]

open access: yes
The Flight Dynamics Facility (FDF) at Goddard Space Flight Center (GSFC) provides spacecraft trajectory determination for a wide variety of National Aeronautics and Space Administration (NASA)-supported satellite missions, using the Tracking Data Relay ...
Beri, A.   +4 more
core   +1 more source

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