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Sensors 2018, 18(2), 428;

Experimental Study of Multispectral Characteristics of an Unmanned Aerial Vehicle at Different Observation Angles

School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China
System Division, Navy Equipment Research Institute, Beijing 100161, China
Author to whom correspondence should be addressed.
Received: 31 October 2017 / Revised: 17 January 2018 / Accepted: 29 January 2018 / Published: 1 February 2018
(This article belongs to the Special Issue UAV or Drones for Remote Sensing Applications)
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This study investigates multispectral characteristics of an unmanned aerial vehicle (UAV) at different observation angles by experiment. The UAV and its engine are tested on the ground in the cruise state. Spectral radiation intensities at different observation angles are obtained in the infrared band of 0.9–15 μm by a spectral radiometer. Meanwhile, infrared images are captured separately by long-wavelength infrared (LWIR), mid-wavelength infrared (MWIR), and short-wavelength infrared (SWIR) cameras. Additionally, orientation maps of the radiation area and radiance are obtained. The results suggest that the spectral radiation intensity of the UAV is determined by its exhaust plume and that the main infrared emission bands occur at 2.7 μm and 4.3 μm. At observation angles in the range of 0°–90°, the radiation area of the UAV in MWIR band is greatest; however, at angles greater than 90°, the radiation area in the SWIR band is greatest. In addition, the radiance of the UAV at an angle of 0° is strongest. These conclusions can guide IR stealth technique development for UAVs. View Full-Text
Keywords: UAV; infrared radiation; exhaust plume; spectra UAV; infrared radiation; exhaust plume; spectra

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Zheng, H.; Bai, T.; Wang, Q.; Cao, F.; Shao, L.; Sun, Z. Experimental Study of Multispectral Characteristics of an Unmanned Aerial Vehicle at Different Observation Angles. Sensors 2018, 18, 428.

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