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[IEEE 2018 Wave Electronics and its Application in Information and Telecommunication Systems (WECONF) - Saint-Petersburg, Russia (2018.11.26-2018.11.30)] 2018 Wave Electronics and its Application in Information and Telecommunication Systems (WECONF) - Electronic Methods to Protect Unmanned Aerial Vehicles from Seizing Control
摘要： the article deals with the issues of security in the transmission of control information over a wireless communication channel between an unmanned aerial vehicle and the control panel, as well as options for electronic methods of protection against external (unauthorized) interception of control of unmanned aerial vehicles.
关键词： wireless data transfer,remote control,control interception,wireless networks,unmanned aerial vehicles
更新于2025-09-23 15:22:29
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Terrestrial laser scanninga??derived canopy interception index for predicting rainfall interception
摘要： Rainfall interception (RI) by forest canopies is an important process in hydrological cycling in forest ecosystems. However, accurately predicting RI is a challenging topic. In this study, a dimensionless descriptor, canopy interception index (CII), for predicting RI was defined. The terrestrial laser scanning was used to estimate CII in four temperate forest types, including Korean pine (Pinus koraiensis) plantation forest (KPF) stands, larch (Larix spp.) plantation forest (LPF) stands, mixed broadleaved forest (MBF) stands and Mongolian oak (Quercus mongolica) forest (MOF) stands. Using the measured RI values over the rainy seasons in 2017 and 2018, CII’s performance for predicting RI was tested, and also compared with several other indices (LAI: leaf area index, PAI: plant area index and ACH: average canopy height). The results indicated that CII was significantly and strongly related with RI for the four forest types together (R2 = 0.79), as well as for an individual forest type (R2 = 0.55~0.63). More importantly, its performance was better than those from LAI (R2 = 0.33~0.43), PAI (R2 = 0.40~0.53) and ACH (R2 = 0.35). All those results demonstrated that CII was an efficient index for accurately predicting RI. The potential applications of CII were also discussed.
关键词： dimensionless descriptor,terrestrial laser scanning,temperate forests,canopy interception index,rainfall interception
更新于2025-09-23 15:19:57
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[IEEE IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Valencia, Spain (2018.7.22-2018.7.27)] IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Sensitivity of Sentinel-1 to Rain Stored in Temperate Forest
摘要： The sensitivity of radar backscatter to the amount of intercepted rain in a Douglas-fir and a beech stand was analyzed to determine the feasibility of retrieval canopy storage capacity from Sentinel-1 (C-band). On average, backscatter of a wet Douglas-fir canopy is ~1.5 dB and ~1 dB higher than the backscatter when the canopy is dry at VH and VV polarization respectively. No consistent differences were found in the case of the beech stand between wet and dry conditions. It is argued that the use of Sentinel-1 to retrieve the amount of intercepted rainfall is limited at best to a reliability of 50% and to canopies with large storage capacity.
关键词： SAR,Sentinel-1,Forest,interception,radar
更新于2025-09-09 09:28:46