A5065015638- Space Satellite Systems and Control
- Spacecraft Dynamics and Control
- Astro and Planetary Science
- Inertial Sensor and Navigation
- Radiation Detection and Scintillator Technologies
- Nuclear Physics and Applications
- Adaptive Control of Nonlinear Systems
- GNSS positioning and interference
- Target Tracking and Data Fusion in Sensor Networks
- Nuclear reactor physics and engineering
- Digital Radiography and Breast Imaging
- Planetary Science and Exploration
- Advanced X-ray Imaging Techniques
- Stellar, planetary, and galactic studies
- Geophysics and Sensor Technology
- Particle Detector Development and Performance
- Advanced Measurement and Detection Methods
- X-ray Spectroscopy and Fluorescence Analysis
- Nuclear Materials and Properties
- Education and Critical Thinking Development
- Historical Geography and Cartography
- Ion-surface interactions and analysis
- Advanced X-ray and CT Imaging
- High-Velocity Impact and Material Behavior
- Distributed Control Multi-Agent Systems
Nanjing University of Aeronautics and Astronautics
2014-2024
Ministry of Industry and Information Technology
2021
Oregon State University
1983
In order to expand the coverage area of satellite navigation systems, a combined constellation which is formed by global and Lagrangian was studied. Only crosslink range measurement used achieve long-term precise autonomous orbit determination for constellation, model derived. Simulations 180 days based on international system (GNSS) service (IGS) ephemeris showed that mentioned method worked well in Earth–Moon system. Statistical results were analyze accuracy under influences different...
In order to improve the accuracy of dynamical model used in orbit determination Lagrangian navigation satellites, nonlinear perturbations acting on satellites are estimated by a neural network. A network based state observer is applied autonomously determine orbits using only satellite-to-satellite range. This autonomous method does not require linearizing mode. There no need calculate transition matrix. It proved that three ranges needed this method; therefore, constellation should include...
In order to improve the autonomy of a maneuvered GEO satellite which is member navigation system, an integrated design method autonomous orbit determination and control was proposed. A neural network state observer designed estimate satellite, with only intersatellite ranging information as observations. The controller determined autonomously by another based on estimated preset correction trajectory. gradient descent learning forgetting factor used derive weight updating strategy can...
In this paper, a control method for space robot formation flying is proposed. A neural network based on Radial Basis Function used to modify the parameters of exponent reaching law sliding mode in order get an optimal balance between convergence speed quantity and fuel consumption; Exponent with saturation function adopted weaken chattering which actuated by unmodeled dynamics high frequency switch control; And also, constructed as PID form relative position error improve accuracy. The...
X-ray communication is a kind of space technology which uses as information carrier. In order to improve the transmission capacity, rate and anti-interference ability communication, we proposes design novel multi-target source. The source composed fast switching module light channels based on FPGA four photoelectric tubes with different target materials: Cr, Fe, Ni, Cu. Using Geant4 software, determined optimal thickness for each material, enabled us fully leverage characteristic X-rays...
The accuracy of autonomous orbit determination Lagrangian navigation constellation will affect the for deep space probes. Because special dynamical characteristics satellite, error caused by different estimation algorithm cause totally accuracy. We apply extended Kalman filter and fading–memory to determinate orbits satellites. errors are compared. using fading-memory can improve 50% compared filter. proposed an integrated fading smooth process determination. square root is introduced deal...
Abstract Near-Earth asteroids pose an enormous threat to Earth. Removing them effectively from risk orbits is a crucial issue. To improve the deflection efficiency, we propose method control intermediate asteroid as gravity tractor change orbit of potentially hazardous asteroid. A multiple kinetic impact applied its toward The goal impacts form system with First, chose that requires smaller transfer velocity increments Then, design and use multi-objective harris hawk optimization algorithm...
In the context of circular restricted three-body problem, trajectory sensitivity to disturbances different kinds, magnitude, and direction are analyzed. Firstly, a method based on eigenvalues state transition matrix is improved achieve computational efficiency. Secondly, error in configuration space proposed calculate local stability detail. Based this method, maximum unstable any point can be decided. As an example, Earth-Moon L1 Lyapunov orbit calculated discussed Finally, extended...
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Abstract X-ray communication based on spectrum modulation information is a novel method, which can effectively improve ability and anti-interference ability. In this paper, four characteristic X-rays are chosen to modulate information. The influence of channel attenuation, random noise in space, miss-shooting rate caused by adjacent targets discussed. Based error-correcting output codes 10-fold cross-validation neural network intelligent classifier designed realize demodulation. Simulation...
An on-orbit thrust estimation method of satellite based on parallel system, which can achieve high-efficiency and high-precision estimation, is proposed. A complete maneuvering system framework constructed. Initially, a real-time artificial model, consistent with the actual established. The injection time control estimated optimally modification model specific treated as optimization parameter. jet time, minimum error, obtained. Then, maneuver strategy designed fed back to system. optimal...