A5101737076- Space Satellite Systems and Control
- Inertial Sensor and Navigation
- Pulsars and Gravitational Waves Research
- Stability and Control of Uncertain Systems
- Astro and Planetary Science
- Spacecraft Dynamics and Control
- Distributed Control Multi-Agent Systems
- Geophysics and Gravity Measurements
- Geophysics and Sensor Technology
- Neural Networks Stability and Synchronization
- Astronomical Observations and Instrumentation
- Spacecraft Design and Technology
- Planetary Science and Exploration
- Indoor and Outdoor Localization Technologies
- Geomagnetism and Paleomagnetism Studies
- Space Technology and Applications
- Energy Harvesting in Wireless Networks
- Robotics and Automated Systems
- Fault Detection and Control Systems
- Satellite Communication Systems
- Environmental Changes in China
- Network Time Synchronization Technologies
- Energy Efficient Wireless Sensor Networks
- GNSS positioning and interference
- Smart Grid Security and Resilience
Sun Yat-sen University
2018-2025
In future geocentric space-based gravitational-wave observatory missions, eclipses due to passing through the Moon's and Earth's shadows can negatively impact sciencecraft's thermal stability steady power supply. The occurrence should be reduced as much possible in orbit design. regard TianQin's circular high orbits, we tackle combined challenges of avoiding stabilizing nearly equilateral-triangle constellation. Two strategies are proposed, including initial phase selection resizing 1:8...
TianQin is a future space-based gravitational wave observatory targeting the frequency window of $10^{-4}$ Hz $\sim 1$ Hz. A large variety sources are expected in this band, including merger massive black hole binaries, inspiral extreme/intermediate mass ratio systems, stellar-mass Galactic compact and so on. will consist three Earth orbiting satellites on nearly identical orbits with orbital radii about $10^5$ km. The form normal triangle constellation whose plane perpendicular to ecliptic...
The technology of satellite orbit prediction (OP) is crucial in space engineering. However, it difficult to precisely predict medium and long-term for the low Earth-orbit (LEO) satellites because time-varying weather inaccurate atmospheric density models. To address problem, a novel intelligent OP method based on variational mode decomposition-support vector machine (VMD-SVM) framework presented. First, concept pseudo-drag coefficient defined, transforming problem into problem. Second,...
Abstract In this paper, a dynamic event‐triggered control problem is discussed for 2‐D continuous systems by the Roesser model. order to reduce communication frequency and avoid dependence on global information, mechanism constructed, which more flexible than some existing schemes with fixed thresholds. Utilizing mechanism, state feedback controller designed. By constructing Lyapunov function, sufficient conditions expressed in terms of linear matrix inequalities (LMIs) are firstly...
The space gravitational wave detector uses the inter-satellite laser interferometer to measure a change in distance with ultra-high precision at picometer level. Its special differential wavefront sensing technology based on interference is used obtain ultra-high-precision relative attitude between spacecrafts. In order acquire measurement, it necessary maintain high-precision pointing and alignment for optical path line-of-sight of detector. This paper proposes frequency division control...
Relative measurements are exploited to cooperatively detect and recover faults in the positioning of Mobile Agent (MA) Swarms (MASs). First, a network vertex fault detection method based on edge testing is proposed. For each edge, property that has functional relationship with properties its two vertices measured tested. Based results network, maximum likelihood principle used identify sources. Second, an distance noncentral chi-square distribution developed for detecting Global Navigation...
This article is concerned with a problem of autonomous configuration estimation for hyperscale distributed spacecraft systems in the case GNSS signals are not available or reliable. A decentralized control input method based on consensus protocol proposed to reduce uncertainty introduced by constellation adjustment. According Bayesian theory, we derive double convolution multivariate Gaussian distributions fuse results estimation. Combined covariance synchronization update technology, design...
Space gravitational wave detection requires establishing laser links between distributed spacecraft for interferometry. Inter-satellite link acquisition is an essential step in this process. Considering the spacecraft’s miniaturization and reliability, a bidirectional scanning method proposed using only field emission electric propulsion quadrant photodetector. This does not require additional sensors actuators. To improve efficiency while ensuring success rate, constant angular velocity...
In this work, we address the issue of event-triggered control under Round-Robin protocol (RRP) for a specific class 2-D continuous system in Roesser model that is subject to communication constraints. Our approach not only considers network congestion but also takes into account problem data collision. To reduce overloads and save bandwidth, propose dynamic scheme determines whether datum should be transmitted or not. Additionally, RRP utilized assign priority actuator at given moment....
Double satellite formation for gravity field exploration is a complex space virtual instrument system with high-precision, whose normal manner threatened by the debris environment. The of based on control prescribed performance studied. Based random impact debris, nonlinear dynamical equations 20 variables are established considering relative attitude double satellite. interferential characteristics and expected stability under certain disturbance conditions in low Earth orbit analyzed. To...
Summary A problem of the attitude cooperative control multi‐spacecraft systems with input time‐varying delay under an undirected graph is addressed in this paper, where does not require any assumption on continuity and its time‐variation rate. Considering communication bandwidth constraint Zeno behavior, a dynamic event‐triggered scheme presented, which more general than some existing schemes fixed threshold. By Lyapunov function technology, sufficient conditions bilinear matrix inequality...
Abstract Space based gravitational wave detectors require a precision relative attitude pointing control in science mode. Their configuration drifts under the influence of perturbations. The spacecraft and telescope optical assembly loops need to respond this change real time. In particular, constellation reference orbiting earth changes much more than sun, which posing great challenge system. This article focuses on tracking problem space observatory disturbances, systematically analyzes...
This paper presents the methods and results for trajectory design optimization low earth orbit (LEO) satellites in formation to observe geostationary (GEO) satellites’ beams. The background of mission is 9th China Trajectory Optimization Competition (CTOC9). designed according observation demands. flying sequence determined by a reference satellite using proposed improved ephemeris matching method (IEMM). changed, maintained transferred following employing multi-impulse control (MICM). Then...