Ambiguous relative orbits in sequential relative orbit estimation with range-only measurements

2018 ◽  
Vol 151 ◽  
pp. 626-644 ◽  
Author(s):  
Jingwei Wang ◽  
Eric A. Butcher ◽  
T. Alan Lovell
Keyword(s):  
Relative Orbit ◽  
Orbit Estimation

scholarly journals Ambiguous Orbits in Elliptic Chief Spacecraft Relative Orbit Estimation with Range-Only Measurements

2019 ◽  
Vol 56 (3) ◽  
pp. 708-724 ◽  
Author(s):  
Jingwei Wang ◽  
Eric A. Butcher ◽  
T. Alan Lovell
Keyword(s):  
Relative Orbit ◽  
Orbit Estimation

Real-time relative orbit estimation of noncooperative space target based on nonlinear filtering

2016 ◽  
Vol 230 (14) ◽  
pp. 2700-2715
Author(s):  
Zhenglong Zhu ◽  
Ye Yan
Keyword(s):  
Real Time ◽  
Nonlinear Filtering ◽  
High Speed ◽  
Attitude Measurement ◽  
J2 Perturbation ◽  
Relative Orbit ◽  
Initial Attitude ◽  
Orbit Estimation ◽  
The Relationship ◽  
Orbit Model

The problem of real-time relative orbit estimation of long range and high speed between a noncooperative target and a chaser is addressed. A high precision relative orbit model, in which the Earth J2 perturbation has been taken into consideration, is established for state estimation. As the attitude of the chaser is required for relative orbit estimation, it has also been estimated. The range, elevation, and azimuth between the target and the chaser, which can be measured by a laser rangefinder and a CCD device, are chosen as measuring vector, while a rate gyroscope and one star sensor is installed on the chaser to measure its rate and attitude parameters. On the basis of nonlinear filtering technology, two kinds of filtering systems are designed, namely the separated filtering system and the united filtering system, and the relationship between the two filtering systems are analyzed. Simulation results indicate the united filtering system is more robust than the separated filtering system against realistic initial attitude errors and attitude measurement noises.

scholarly journals On Kalman Filtering and Observability in Nonlinear Sequential Relative Orbit Estimation

2017 ◽  
Vol 40 (9) ◽  
pp. 2167-2182 ◽  
Author(s):  
Eric A. Butcher ◽  
Jingwei Wang ◽  
T. Alan Lovell
Keyword(s):  
Kalman Filtering ◽  
Relative Orbit ◽  
Orbit Estimation

Spectroscopic Observations of Visual Double Stars

1965 ◽  
Vol 5 ◽  
pp. 109-111
Author(s):  
Frederick R. West
Keyword(s):  
Radial Velocity ◽  
High Dispersion ◽  
Velocity Difference ◽  
Spectrograph Slit ◽  
Spectroscopic Observations ◽  
Double Stars ◽  
Visual Double Stars ◽  
Relative Orbit ◽  
Two Component ◽  
Star Images

There are certain visual double stars which, when close to a node of their relative orbit, should have enough radial velocity difference (10-20 km/s) that the spectra of the two component stars will appear resolved on high-dispersion spectrograms (5 Å/mm or less) obtainable by use of modern coudé and solar spectrographs on bright stars. Both star images are then recorded simultaneously on the spectrograph slit, so that two stellar components will appear on each spectrogram.

Improving Satellite Orbit Estimation Using Commercial Cameras

2015 ◽  
Vol 8 (5) ◽  
pp. 174
Author(s):  
Ayman Hamdy Kassem ◽  
Gamal Mohamad El-Bayoumi ◽  
Tamer Mekky Habib ◽  
Karim Ahmed Kamalaldin
Keyword(s):  
Satellite Orbit ◽  
Orbit Estimation
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