Accession Number : AD1052857


Title :   Propagation Environment Assessment Using UAV Electromagnetic Sensors


Descriptive Note : Technical Report


Corporate Author : Naval Postgraduate School Monterey United States


Personal Author(s) : Qiu,Yi K


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/1052857.pdf


Report Date : 01 Mar 2018


Pagination or Media Count : 83


Abstract : In this thesis, we attempt to build a picture of local propagation conditions by measuring signal transmission losses that allows naval operators to better understand the performance of their electromagnetic systems. By comparing the collected data against those of known baseline conditions, we can reliably determine the presence of atmospheric ducts as well as their ceiling heights, which include the detection of elevated ducts. Another function of the post-processing analysis of the collected data is to estimate , which is a parameter of the atmospheric refractivity. Knowledge of allows us to estimate the radar horizon, which is the maximum distance that a transmitter and receiver can be separated and remain within the propagation line-of-sight, despite the curvature of the Earth. This important information allows operators to choose the optimal settings for the maximum detection range of their radar and radio systems. We also investigate the measurement system requirements and operational scenarios such as the number of unmanned aerial vehicles and the total time needed to collect sufficient data. Two different types of flight patterns were studied, and our findings show that the vertical flight pattern using a rotary platform is more efficient. Furthermore, our simulation results suggest that the optimal operating frequency for the system is in the S Band.


Descriptors :   TRANSMISSION LOSS , refraction , UNMANNED AERIAL VEHICLES , ELECTROMAGNETIC RADIATION , scenarios , measurement


Subject Categories : Radiofrequency Wave Propagation
      Atmospheric Physics


Distribution Statement : APPROVED FOR PUBLIC RELEASE