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2007 Asian and Pacific Conference on Synthetic Aperture Radar(APSAR 2007)

作者： 1 Wen-Qin Wang Jingye Cai Qicong Peng University of Electronic Science and Technology of China Chengdu P. R. China 610054

Inspired by the recent advances in near-space defined as the region between 20km and 100km,this paper proposed the concept of near-space SAR. To the author’s knowledge,this is the first time that the near-space SAR is being proposed for microwave remote sensing missions. By placing the SAR’s transmitter /receiver in the near-space platforms,many functions that are currently performed with the satellites or airplanes could be performed much more cheaply and with much greater operational unity. These advantages make near-space SAR attractive for a variety of remote sensing missions. In this paper,the potential and challenges of the near-space SAR,compared to current spaceborne SAR and airborne SAR,were detailed. Various near-space SAR configurations are introduced,and their potential for different applications such as passive imaging,high-resolution and wide-swath imaging,and inverse SAR imaging were investigated. It is shown that,the use of near-space SAR can lead to the solutions that are previously thought to be out of reach for remote sensing scientists and customers.

关键词： near-space SAR Remote Sensing

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Concept Design,Modeling and Station-keeping Attitude Control of an Earth Observation Platform

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Chinese Journal of Mechanical Engineering 2012年第6期25卷 1245-1254页

作者： YANG Yuenen WU Jie ZHENG Wei College of Aerospace and Materials Engineering National University of Defense TechnologyChangsha 410073China

The stratosphere airship provides a unique and promising platform for earth observation. Researches on the project design and control scheme for earth observation platforms are still rarely documented. Nonlinear dynamics, model uncertainties, and external disturbances contribute to the difficulty in maneuvering the stratosphere airship. A key technical challenge for the earth observation platform is station keeping, or the ability to remain fixed over a geo-location. This paper investigates the conceptual design, modeling and station-keeping attitude control of the near-space earth observation platform. A conceptual design of the earth observation platform is presented. The dynamics model of the platform is derived from the Newton-Euler formulation, and the station-keeping control system of the platform is formulated. The station-keeping attitude control approach for the platform is proposed. The multi-input multi-output nonlinear control system is decoupled into three single-input single-output linear subsystems via feedback linearization, the attitude controller design is carried out on the new linear systems using terminal sliding mode control, and the global stability of the closed-loop system is proven by using the Lyapunov theorem. The performance of the designed control system is simulated by using the variable step Runge-Kutta integrator. Simulation results show that the control system tracks the commanded attitude with an error of zero, which verify the effectiveness and robustness of the designed control system in the presence of parametric uncertainties. The near-space earth observation platform has several advantages over satellites, such as high resolution, fast to deploy, and convenient to retrieve, and the proposed control scheme provides an effective approach for station-keeping attitude control of the earth observation platform.

关键词： earth observation platform novel design attitude control terminal sliding mode station keeping near-space

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