Results 261 to 270 of about 99,641 (294)

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 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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I: PRECISE ORBIT DETERMINATION AND GRAVITY FIELD MODELLING: Strategies for Precise Orbit Determination of Low Earth Orbiters Using the GPS

Space Science Reviews, 2003
Considerable experience accumulated during the past decade in strategies for processing GPS data from ground-based geodetic receivers. First experience on the use of GPS observations from spaceborne receivers for orbit determination of satellites on low altitude orbits was gained with the launch of TOPEX/POSEIDON ten years ago.
U. Hugentobler, G. Beutler
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GPS orbit processing in support of low earth orbiter precise orbit determination

Advances in Space Research, 2003
Abstract There are currently an increasing number of LEO missions incorporating dual frequency GPS receivers for Satellite to Satellite Tracking. The majority of LEO precise orbit determination (POD) strategies rely on high quality GPS orbits and clocks such as those supplied by the IGS Final product.
I Romero, H Boomkamp, J Dow, C Garcia
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Precise Orbit Determination During Transfer Orbit Phase of GSAT-1

Journal of Spacecraft and Rockets, 2004
Orbit determination results are obtained for the GSAT-1 spacecraft launched by the Indian Space Research Organization using the first of its indigenously developed geosynchronous satellite launch vehicles. A description is given of the processes by which the mission operational ground-based orbit determination software estimated the satellite’s ...
B. Subramanian, Anatta Sonney, N. V. Vighnesam, N. S. Gopinath   +3 more
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Effect of GPS orbit errors on ICESat precision orbit determination

Astrodynamics Specialist Conference, 2000
To achieve the orbit determination requirement of the EOS ICESat, which is 5 cm and 20 cm in radial and horizontal components, respectively, using the GPS tracking system, it is required to use the precise GPS ephemeris. Three different levels of GPS orbit errors were generated through a simulation, and the effect of these GPS orbit errors on ICESat ...
H. Rim, C. Webb, B. Schutz
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Simulation of Precise Offline Satellite Orbit Determination

2010 Second International Conference on Computational Intelligence, Modelling and Simulation, 2010
In this paper we have taken advantages of precise orbit determination of satellite trajectories using offline simulations. Furthermore perturbation forces which make complex motion equations of satellites and cause more complicated satellites trajectories are simulated using Poisson and Lagrange brackets methods. Moreover perturbation forces effects in
Mohammad Bagher Alaee, Hossein Rahmani
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Kinematic Precise Orbit Determination for Gravity Field Determination

2005
In this paper we first present approaches and results in precise orbit determination (POD) for satellitesin Low Earth Orbit (LEO) based on one or two frequency GPS measurements and, secondly, we focus on the relations between kinematic POD and gravity field determination.
Švehla, Dražen, Rothacher, M.
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Precise Orbit Determination Using Satellite Radar Ranging

Journal of Guidance, Control, and Dynamics, 2012
Precise orbit determination can be achieved using only range measurements (no angle measurements) collected from several radars in a regional network. As uncompensated range biases are comparable to Global Positioning System pseudorange errors, 1 position and velocity errors smaller than 10 m and 1 cm=s are possible.
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Precision orbit determination performance for CryoSat-2

Advances in Space Research, 2018
Abstract In this paper we discuss our efforts to perform precision orbit determination (POD) of CryoSat-2 which depends on Doppler and satellite laser ranging tracking data. A dynamic orbit model is set-up and the residuals between the model and the tracking data is evaluated. The average r.m.s. of the 10 s averaged Doppler tracking pass residuals is
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