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Aircraft landing using dynamic 2D image-based guidance control
摘要： This work proposes a 2D image-based controller to automatically steer a fixed-wing Unmanned Aerial Vehicle (UAV) during the first three stages of landing: alignment, glide-slope, and flare. Observable image features of the runway and its textured ground are exploited to derive a feedback controller for the automatic maneuver. The proposed controller ensures the horizontal position alignment and a smooth touchdown of the aircraft without estimating the height above the runway. In addition, the 2D image-based control structure adopted also enforces wind disturbance rejection, without the need for an explicit wind estimator. Simulation results are presented to illustrate the performance of the controller.
关键词： automatic landing,optical flow,fixed-wing unmanned aerial vehicle,2D image-based feedback control
更新于2025-09-10 09:29:36
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Flight Considerations and Hyperspectral Image Classifications for Dryland Vegetation Management from a Fixed-wing UAS
摘要： Unmanned Aerial Systems (UAS)-based hyperspectral remote sensing capabilities developed by the Idaho National Lab and Boise Center Aerospace Lab were tested via demonstration flights that explored the influence of altitude on geometric error, image mosaicking, and dryland vegetation classification. The motivation for this study was to better understand the challenges associated with UAS-based hyperspectral data for distinguishing native grasses such as Sandberg bluegrass (Poa secunda) from invasives such as burr buttercup (Ranunculus testiculatus) in a shrubland environment. The test flights successfully acquired usable images. Unsupervised flightline data capable of supporting classifiable composite classification results support vegetation management objectives that rely on mapping shrub cover and distribution patterns. However, supervised classifications performed poorly despite spectral separability in the image-derived endmember pixels. In many cases, the supervised classifications accentuated noise or features in the mosaic that were artifacts of color balancing and feathering in areas of flightline overlap. Future UAS flight missions that optimize flight planning; minimize illumination differences between flightlines; and leverage ground reference data and time series analysis should be able to effectively distinguish native grasses such as Sandberg bluegrass from burr buttercup.
关键词： Management,Unmanned,Imaging spectroscopy,Sagebrush,Monitoring,Hyperspectral,drones,Fixed-wing,Vegetation
更新于2025-09-04 15:30:14
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[IEEE 2018 International Conference on Information Systems and Computer Science (INCISCOS) - Quito, Ecuador (2018.11.13-2018.11.15)] 2018 International Conference on Information Systems and Computer Science (INCISCOS) - Energy Management of a Solar-Battery Powered Fixed-Wing UAV
摘要： In this work, a hybrid solar-battery feeding system is proposed to achieve a constant output power on a fixed-wing Unmanned Aerial Vehicle-UAV. Firstly, a single and hybrid power source configurations for long endurance UAV applications are exposed. Thus, a solar-battery based feeding system with a suitable energy management is proposed. Furthermore, a Maximum Power Point Tracking (MPPT) technique is selected to achieve the maximum efficiency of the solar photovoltaic (PV) array. Besides, Sliding-Mode Control (SMC) is implemented on a cascade control scheme in order to achieve a suitable energy conversion. Finally, the hybrid feeding system performance is analyzed for different solar radiation and load profiles remarking proper dynamic and steady-state responses.
关键词： unmanned aerial vehicle,maximum power point tracking,fixed-wing,sliding-mode control,Energy management,photovoltaic system
更新于2025-09-04 15:30:14