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Analysis of UHF-Band Propagation Loss in Long-distance Air-to-Ground Communication Tests

UHF 대역 장거리 항공 통신 시험의 전파 손실 분석

  • Received : 2018.04.24
  • Accepted : 2018.08.03
  • Published : 2018.08.31

Abstract

In this paper, we measured the propagation path loss by a ground to air flight communication test at UHF band and analyzed the results. The ground receiving terminal was located at 1,100m above sea level in Cheju Island and the airborne transmit terminal flew at an altitude of 3.5km from 150 to 220km from the ground terminal. In this case, the ground terminal and the airborne terminal are on the Line of Sight. Therefore loss in this communications environment can be predicted based on Free Space Loss. However, in this test, the sea level exists between two terminals, and due to the very small angle of incidence on the reflecting surface due to the long-range communication environment, it is not possible to accurately predict the loss of free space only. Therefore, considering that there are no surrounding obstacles and that a line of sight is secured between the end of two terminals, we applied a plane earth reflection model and a spherical earth reflection model to estimate the propagation path loss and compared with the actual test results. As a result of the comparison, the predicted propagation path loss by a spherical earth reflection model were quite similar to the actual test values.

Keywords

Aeronautical communications;Maritime communications;Propagation path loss;Spherical earth reflection model;UHF band

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