A5044250765- Astro and Planetary Science
- Space Satellite Systems and Control
- Planetary Science and Exploration
- Spacecraft Dynamics and Control
- Geophysics and Sensor Technology
- Geophysics and Gravity Measurements
- Inertial Sensor and Navigation
- Astronomical Observations and Instrumentation
- Quantum chaos and dynamical systems
- Stellar, planetary, and galactic studies
- Nonlinear Dynamics and Pattern Formation
- Satellite Image Processing and Photogrammetry
- Laser-induced spectroscopy and plasma
- Magnetic confinement fusion research
- Target Tracking and Data Fusion in Sensor Networks
- Solar and Space Plasma Dynamics
- Scientific Research and Discoveries
- GNSS positioning and interference
- Geochemistry and Geologic Mapping
- Chaos control and synchronization
- Optical Systems and Laser Technology
Purple Mountain Observatory
2013-2023
Chinese Academy of Sciences
2019-2023
Changchun Observatory
2018-2019
University of Chinese Academy of Sciences
2014-2015
University of Strathclyde
1998-2002
Abstract As part of the International Asteroid Warning Network's observational exercises, we conducted a campaign to observe near-Earth asteroid 2019 XS around its close approach Earth on 2021 November 9. The goal was characterize errors in observation times reported Minor Planet Center, which become an increasingly important consideration as astrometric accuracy improves and more fast-moving asteroids are observed. exercise, total 957 observations during encounter were subsequently analyzed...
The detection and study of the rotational motion space debris, which is affected by environmental factors, a popular topic. However, relevant research in extremely low-orbit regions cannot be conducted due to lack observational data. Here, we fill gaps present evolution Tiangong-1 5 months prior reentry. Derived from changes relative distance its two corner cube reflectors satellite laser ranging data, angular momentum Tiangong-1, relatively stable during observation, deviates maximum...
The applications of digital centering algorithms have a major impact on precise astrometry. In optical observations space debris, due to the observing strategies and methods, image degradation is distinct, which affects centroid computing CCD images. Adopting four widely-used algorithms, including modified moment, one-dimensional Gaussian fit, two-dimensional fit median, tests are made raw images debris. With observation positions obtained by astronomical calibration reference ones from...
The theoretical analysis of Allan & Cook on the mechanisms orbital plane precession for medium-high circular orbits is briefly reviewed, and fact that there are two types possible (not only classical Laplace precession) long-term evolution near-circular especially emphasized. Based mechanisms, analytical formulae quantitative variation ranges inclination derived by Zhao et al. revised, complete obtained. qualitative characteristic formula inclination-longitude ascending node geostationary in...
Numerical illustrations of Arnold diffusion for an example power system are presented using Hamiltonian formation. The existence stochasticity and is confirmed by the calculation maximum Lyapunov exponents. It revealed numerically that random-like motion can carry state arbitrarily close to any region phase space consistent with energy conservation, while ordinary chaos only inhabited in a specific whole space. Some analysis reason implication also included.
This paper describes for the first time chaotic motion and diffusion an example multi-machine power system using Hamiltonian formation. The existence of under some conditions is confirmed by calculation maximum Lyapunov exponents. It revealed numerically that random-like Arnold can carry state arbitrarily close to any region phase space consistent with energy conservation while ordinary chaos only inhabited in a specific whole space. A brief analysis reason also included.