Editing Unmanned aerial vehicle (section)

====Sensors====
Position and movement sensors give information about the aircraft state. Exteroceptive sensors deal with external information like distance measurements, while exproprioceptive ones correlate internal and external states.<ref name="Nature - Future of sUAVs">{{cite journal|last1=Floreano|first1=Dario|last2=Wood|first2=Robert J.|title=Science, technology and the future of small autonomous drones|journal=Nature|date=27 May 2015|volume=521|issue=7553|pages=460–466|doi=10.1038/nature14542|pmid=26017445|bibcode=2015Natur.521..460F|s2cid=4463263|url=http://infoscience.epfl.ch/record/208757|access-date=26 October 2019|archive-date=26 October 2019|archive-url=https://web.archive.org/web/20191026050814/https://infoscience.epfl.ch/record/208757|url-status=live}}</ref>

Non-cooperative sensors are able to detect targets autonomously so they are used for separation assurance and collision avoidance.<ref>{{Cite journal|last1=Fasano|first1=Giancarmine|last2=Accardo|first2=Domenico|last3=Tirri|first3=Anna Elena|last4=Moccia|first4=Antonio|last5=De Lellis|first5=Ettore|date=1 October 2015|title=Radar/electro-optical data fusion for non-cooperative UAS sense and avoid|journal=Aerospace Science and Technology|volume=46|pages=436–450|doi=10.1016/j.ast.2015.08.010|doi-access=free|bibcode=2015AeST...46..436F }}</ref>

Degrees of freedom (DOF) refers to both the amount and quality of onboard sensors: 6 DOF implies 3-axis gyroscopes and accelerometers (a typical [[inertial measurement unit]]{{snd}} IMU), 9 DOF refers to an IMU plus a compass, 10 DOF adds a barometer and 11 DOF usually adds a GPS receiver.<ref>{{Cite web|title = Arduino Playground – WhatIsDegreesOfFreedom6DOF9DOF10DOF11DOF|url = http://playground.arduino.cc/Main/WhatIsDegreesOfFreedom6DOF9DOF10DOF11DOF|website = playground.arduino.cc|access-date = 4 February 2016|archive-date = 18 February 2016|archive-url = https://web.archive.org/web/20160218110500/http://playground.arduino.cc/Main/WhatIsDegreesOfFreedom6DOF9DOF10DOF11DOF|url-status = live}}</ref>

In addition to the navigation sensors, the UAV (or UAS) can be also equipped with monitoring devices such as: [[RGB color model|RGB]], [[Multispectral imaging|multispectral]], [[Hyperspectral imaging|hyper-spectral]] cameras or [[Lidar|LiDAR]], which may allow providing specific measurements or observations.<ref>{{Cite journal |last1=Manfreda |first1=Salvatore |last2=McCabe |first2=Matthew |last3=Miller |first3=Pauline |last4=Lucas |first4=Richard |last5=Pajuelo Madrigal |first5=Victor |last6=Mallinis |first6=Giorgos |last7=Ben Dor |first7=Eyal |last8=Helman |first8=David |last9=Estes |first9=Lyndon |last10=Ciraolo |first10=Giuseppe |last11=Müllerová |first11=Jana |last12=Tauro |first12=Flavia |last13=de Lima |first13=M. |last14=de Lima |first14=João |last15=Maltese |first15=Antonino |date=2018-04-20 |title=On the Use of Unmanned Aerial Systems for Environmental Monitoring |journal=Remote Sensing |language=en |volume=10 |issue=4 |pages=641 |doi=10.3390/rs10040641 |bibcode=2018RemS...10..641M |issn=2072-4292|doi-access=free |hdl=10251/127481 |hdl-access=free }}</ref>