Results 251 to 260 of about 2,642,880 (286)

Antenna for precise orbit determination

Acta Astronautica, 2009
Abstract The ESA SWARM mission will consist of three satellites that will measure the Earth magnetic field. The system calls for metre accuracy knowledge of the measurement locations. To achieve this a GPS receiver is used. At least four GPS signals are tracked to determine the code and carrier ranges, from which the position can be derived.
Johan Wettergren, Magnus Bonnedal, Per Ingvarson, Bo Wästberg   +3 more
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Precise orbit determination for GRACE

Advances in Space Research, 2003
Abstract The twin, co-orbiting GRACE (Gravity Recovery and Climate Experiment) satellites were launched in March 2002. The primary objective of the GRACE mission is to determine the Earth's gravity field and its temporal variations with unprecedented accuracy. To satisfy this objective as well as other applications (e.g.
Kang, Z., Nagel, P., Pastor, R.
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Precise orbit determination of Beidou Satellites with precise positioning

Science China Earth Sciences, 2012
Chinese Beidou satellite navigation system constellation currently consists of eight Beidou satellites and can provide preliminary service of navigation and positioning in the Asia-Pacific Region. Based on the self-developed software Position And Navigation Data Analysis(PANDA) and Beidou Experimental Tracking Stations (BETS), which are built by Wuhan ...
Chuang Shi, QiLe Zhao, Min Li, WeiMing Tang, ZhiGang Hu, YiDong Lou, HongPing Zhang, XiaoJi Niu, JingNan Liu   +8 more
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Experiment for Precise Orbit Determination on InnoCube

2023
Computing platforms, such as FPGAs and SoCs, are delivering high performance systems in a form factor suitable for small satellites. By offering system-on-modules, technology entry has been drastically lowered. A first step to achieve these higher processing capabilities in orbit is envisioned in the EPISODE payload of the 3U InnoCube satellite, set to
Gläsner, S., Grzesik, B., Stoll, E.
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Precise Orbit Determination of the MESSENGER Spacecraft

Journal of Guidance, Control, and Dynamics
The NASA MESSENGER mission explored Mercury for more than four years to investigate the properties of the planet. To safely operate in the harsh conditions around Mercury, the spacecraft was in a highly eccentric orbit with a low periapsis altitude. The radiation environment had a strong impact on the spacecraft orbit evolution because of the proximity
Andolfo, Simone, Genova, Antonio, Del Vecchio, Edoardo   +2 more
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Precise orbit determination for lunar satellite

Acta Astronautica, 2002
Lunar satellite in the polar orbit is the most popular concept in the recent and future lunar exploration missions for finding the water and other objectives. The motion and perturbed solution of lunar satellite are distinctly different from that of the earth satellite because the central body of the satellite, the Moon, is not the same as the Earth ...
Liu Lin, Liu Yingchun
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HY-2D input data for Precise Orbit Determination

2021
This document describes the information required to ensure optimal parameterisation of on-board and ground POD processing software in the HY-2D context.
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A precise determination of the 3s proton orbit

Nuclear Physics A, 1983
Abstract Elastic electron scattering cross sections have been measured for 205 Tl and 206 Pb at an incident energy of 502 MeV, covering a momentum transfer range from 1.4 to 3.2 fm −1 . The charge density difference of the two isotones is accurately determined.
B. Frois, J.M. Cavedon, D. Goutte, M. Huet, Ph. Leconte, C.N. Papanicolas, X.-H. Phan, S.K. Platchkov, S.E. Williamson, W. Boeglin, I. Sick   +10 more
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Thermospheric events in CHAMP Precise Orbit Determination

2003
The accelerometer on-board the CHAMP satellite measures thermospheric events like large solar mass eruptions reaching Earth. The accelerometer data allow to replace the models for the non-conservative forces in Precise Orbit Determination (POD). The paper will discuss the impacts on POD and show some of the results.
König, R., Neumayer, K.
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The EUMETSAT Environment for Precise Orbit Determination

SpaceOps 2008 Conference, 2008
In the frame of the processing of data from the GNSS Receiver for Atmospheric Sounding (GRAS) instrument onboard the MetOp satellites, EUMETSAT has developed an environment for operational Precise Orbit Determination (POD) processing and validation. The design of this POD environment, in which several components for validation, monitoring, reprocessing
Yago Andrés, Francisco Sancho, Christian Marquardt   +2 more
openaire   +1 more source