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Concurrent multi-task pre-processing method for LEO mega-constellation based on dynamic spatio-temporal grids

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Chinese Journal of Aeronautics 2023年第11期36卷 233-248页

作者： xibin cao Ning LI Shi QIU Research Center of Satellite Technology Harbin Institute of TechnologyHarbin 150080China

The Low Earth Orbit(LEO)remote sensing satellite mega-constellation has the characteristics of large quantity and various types which make it have unique superiority in the realization of concurrent multiple ***,the complexity of resource allocation is increased because of the large number of tasks and ***,the primary problem of implementing concurrent multiple tasks via LEO mega-constellation is to pre-process tasks and observation *** address the challenge,we propose a pre-processing algorithm for the mega-constellation based on highly Dynamic Spatio-Temporal Grids(DSTG).In the first stage,this paper describes the management model of mega-constellation and the multiple ***,the coding method of DSTG is proposed,based on which the description of complex mega-constellation observation resources is *** the third part,the DSTG algorithm is used to realize the processing of concurrent multiple tasks at multiple levels,such as task space attribute,time attribute and grid task importance ***,the simulation result of the proposed method in the case of constellation has been given to verify the effectiveness of concurrent multi-task pre-processing based on *** autonomous processing process of task decomposition and task fusion and mapping to grids,and the convenient indexing process of time window are verified.

关键词： LEO mega-constellation Concurrent multiple tasks Tasks pre-processing Highly dynamic spatiotemporal grids Multi-task fusion merging Importance evaluation

Tangent-impulse transfer from elliptic orbit to an excess velocity vector

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Chinese Journal of Aeronautics 2014年第3期27卷 577-583页

作者： Zhang Gang Zhang Xiangyu cao xibin Research Center of Satellite Technology Harbin Institute of Technology National and Local United Engineering Research Center of Small Satellite Technology

The two-body orbital transfer problem from an elliptic parking orbit to an excess veloc-ity vector with the tangent impulse is studied. The direction of the impulse is constrained to be aligned with the velocity vector, then speed changes are enough to nullify the relative velocity. First, if one tangent impulse is used, the transfer orbit is obtained by solving a single-variable function about the true anomaly of the initial orbit. For the initial circular orbit, the closed-form solution is derived. For the initial elliptic orbit, the discontinuous point is solved, then the initial true anomaly is obtained by a numerical iterative approach; moreover, an alternative method is proposed to avoid the singularity. There is only one solution for one-tangent-impulse escape trajectory. Then, based on the one-tangent-impulse solution, the minimum-energy multi-tangent-impulse escape trajectory is obtained by a numerical optimization algorithm, e.g., the genetic method. Finally, several examples are provided to validate the proposed method. The numerical results show that the minimum-energy multi-tangent-impulse escape trajectory is the same as the one-tangent-impulse trajectory.

关键词： Elliptic orbit Escape trajectory Excess velocity vector Orbital transfer Tangent impulse

Force-position collaborative optimization of rope-driven snake manipulator for capturing non-cooperative space targets

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Chinese Journal of Aeronautics 2024年第9期37卷 369-384页

作者： Xiaofeng LI Jian TIAN Cheng WEI xibin cao School of Astronautics Harbin Institute of TechnologyHarbin 150001China Beijing Instiuteof Spacecraft System Engineering China Academy of Space TechnolgyBeijing 100094Chia

With the rapid development of space activities,non-cooperative space targets increase swiftly,such as failed satellites and upper stages,threating normal spacecrafts *** there are some problems in the capture process,such as excessive collision and fast tumbling of targets,manipulator with redundant Degrees of Freedom(DOFs)can be used to improve the compliance and therefore solve these *** Rope-Driven Snake Manipulator(RDSM)is a combina-tion of hyper-redundant DOFs and better compliance,and therefore it is suitable for capturing *** this paper,a snake manipulator mechanism is designed,and the complete kinematic model and system dynamic model considering RDSM,target and contact is ***,to obtain the configuration of joint with hyper-redundant DOFs,an improved motion dexterity index is pro-posed as the joint motion optimization ***,the force-position collaborative optimization index is designed to adjust active stiffness,and the impedance control method based on the modified index is used to capture the space ***,the proposed force-position collaborative opti-mization method is verified by virtual prototype *** results demonstrate that based on the proposed method,the collision force is reduced by about 25%compared to normal impe-dance control,showing higher safety.

关键词： Capturing non-cooperative spacetargets Rope-driven snakemanipu-lator Force-position collaborative optimization Redundant degrees of free-dom Active stiffness adjustment

Method of SLAS’s ground track manipulation based on tangential impulse thrust

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Journal of Systems Engineering and Electronics 2023年第5期34卷 1285-1293页

作者： LE Xinlong cao xibin DAI Yu WU Fan School of Astronautics Harbin Institute of TechnologyHarbin 150001China

Satellites with altitudes below 400 km are called super low altitude satellites(SLAS),often used to achieve responsive imaging ***,it is important for the manipulation of its ground *** at the problem of ground track manipulation of SLAS,a control method based on tangential impulse thrust is ***,the equation of the longitude difference between SLAS and the target point on the target latitude is derived based on Gauss’s variational *** this basis,the influence of the tangential impulse thrust on the ground track’s longitude is ***,the method for ground track manipulation of SLAS under the tangential impulse thrust is *** simulation results verify the effective-ness of the method,after manipulation,the satellite can visit the target point and revisit it for multiple days.

关键词： super low altitude satellite(SLAS) ground track drift modeling ground track manipulation tangential impulse thrust

Payload-oriented control scheme for rotating payload satellite considering inertia uncertainties and measurement errors

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Chinese Journal of Aeronautics 2023年第10期36卷 335-352页

作者： Yatao ZHAO Cheng WEI Chengfei YUE xibin cao School of Astronautics Harbin Institute of TechnologyHarbin 150001China

For the remote sensing satellite with an unbalanced rotating payload suspended by an Active Magnetic Bearing(AMB),this paper proposes a payload-oriented control scheme where the high-precision payload attitude control is ***,to suppress the disturbances induced by payload inertia uncertainties and state measurement errors,an integrated framework of parameter identification and nonlinear predictive filtering is proposed to estimate payload inertia parameters and system states from multi-timescale,noise-and drift-contaminated measurement data,breaking the mutual constraint between identification and ***,based on the estimation results,the control law and bearing electromagnetic force allocation strategy of the payloadoriented scheme are provided,so that the payload tracks the desired motion and the satellite platform follows payload to prevent the air gap of AMB from exceeding the safety ***,the simulations are carried out to verify the advantages of the proposed control scheme in enhancing the payload control precision and isolating the platform vibration.

关键词： Attitude control Identification Payload-oriented scheme Satellites State estimation

Robust D-stability LMI conditions of matrix polytopes via affine parameter-dependent Lyapunov functions

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Journal of Systems Engineering and Electronics 2013年第6期24卷 984-991页

作者： Pan Xiong Feng Wang xibin cao Guangren Duan School of Astronautics Harbin Institute of Technology National and Local United Research Center of Small Satellite Technology

The problem of the robust D-stability analysis for linear systems with parametric uncertainties is addressed. For matrix polytopes, new conditions via the affine parameter-dependent Lyapunov function of uncertain systems are developed with the benefit of the scalar multi-convex function. To be convenient for applications, such conditions are simplified into new linear matrix inequality （LMI） conditions, which can be solved by the powerful LMI toolbox. Numerical examples are provided to indicate that this new approach is less conservative than previous results for Hurwitz stability, Schur stability and D-stability of uncertain systems under certain circumstances.

关键词： linear uncertain system robust D-stability analysis linear matrix inequality (LMI) condition affine parameterdependent Lyapunov function matrix polytope.

Satellite anomaly detection based on reconstruction discrepancy theory utilizing a new dual-branch reconstruction model

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Science China(Technological Sciences) 2024年第10期67卷 3294-3307页

作者： ZHAO HaoTian QIU Shi LIU Ming cao xibin Research Center of Satellite Technology School of AstronauticsHarbin Institute of TechnologyHarbin 150001China

To enhance the accuracy of deep learning methods based on reconstruction discrepancy in satellite anomaly detection tasks,this study proposes a dual-branch reconstruction model(DBRM)and designs a comprehensive satellite anomaly detection framework around this ***,we introduce the temporal-channel mixer(TC-Mixer)module,which mainly comprises a self-attention layer for capturing long-range temporal dependencies in telemetry data,and two types of feed-forward networks(FFN)for extract-ing complex patterns in the temporal and channel dimension of telemetry *** design endows the TC-Mixer module with robust capabilities for extracting complicated dependencies in telemetry ***,with the TC-Mixer module as the main component,we designed the *** model utilizes a shared latent representation layer,allowing the regeneration branch and forecasting branch of the DBRM to share most of the feature extraction network *** approach significantly en-hances the model’s regression accuracy while reducing computational ***,using the DBRM as the core network model,we devised a comprehensive satellite anomaly detection *** includes an anomaly criterion that considers the reconstruction discrepancy of both the regeneration and forecasting branches,the peak-over-threshold(POT)method for anomaly thresholding,and the MIC-based feature engineering method,***,we conducted comparative experiments with several SOTA anomaly detection algorithms on two public and one private satellite anomaly detection *** experimental results validate the effectiveness and superiority of our proposed method.

关键词： anomaly detection reconstruction discrepancy dual-branch reconstruction model(DBRM) satellite telemetry data time series

Conceptual rotational mode design for optical conical scanning imaging small satellites

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Science China(Technological Sciences) 2020年第8期63卷 1383-1395页

作者： WANG Feng XI RuiChen YUE ChengFei LI HuaYi cao xibin Research Center of the Satellite Technology Harbin Institute of TechnologyHarbin 150001China Institute of Space Science and Applied Technology Harbin Institue of TechnologyShenzhen 518055China

This paper focuses upon the novel optical conical scanning imaging working mode design for small *** kind of satellite employs only one inclined optical camera achieving wide-swath imaging via a rotational motion about the nadir axis either by the camera or by the *** working modes are designed,i.e.,high-speed rotational mode,low-speed rotational mode,and variable-speed rotational *** the high-speed and low-speed working modes,the camera rotates at a constant speed and the corresponding angular velocity is derived under the consideration of guaranteed coverage and minimized *** improve the system performance,an enhanced working mode taking advantages of both the high-speed rotational mode and lowspeed rotational mode is *** in this variable-speed rotational mode,the camera rotates slowly to get high-quality pictures when it works,while it rotates rapidly to reduce the energy consumption and save the storage during which period the camera is turned off to minimize the *** these working modes are illustrated in detail,and numerical simulation tests are conducted to validate their effectiveness.

关键词： remote sensing optical imaging wide-swath imaging conical scanning small satellite

Adaptive dynamic programming-based fault-tolerant attitude control for flexible spacecraft with limited wireless resources

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Science China(Information Sciences) 2023年第10期66卷 213-228页

作者： Ming LIU Qiuhong LIU Lixian ZHANG Guangren DUAN xibin cao School of Astronautics Harbin Institute of Technology Beijing Institute of Control Engineering

This paper investigates the attitude control for flexible spacecraft subject to actuator faults and limited onboard communication resources. The control torque quantization scheme is considered between the controller and actuator to reduce the communication burden on the spacecraft. An integral sliding mode control method is designed to stabilize the closed-loop attitude control system and ensure the near-optimal performance of the sliding motion. First, an iterative learning observer scheme is employed to reconstruct the actuator faults and the unknown nonlinear flexible dynamics. Second, an integral sliding surface is combined with the backstepping control method to resolve the time-varying characterization of the closed system. Third, a combination of the adaptive dynamic programming technique and the adaptive single critic neural network approximation is employed to examine the optimal control policy. Finally, the efficacy of the proposed spacecraft attitude control method is demonstrated via a simulation.

关键词： flexible spacecraft fault-tolerant attitude control signal quantization adaptive dynamic programming neural network learning