NVIS HF signal propagation in ionosphere using calculus of variations  

作　　者：Umut Sezen Feza Arikan Orhan Arikan 

机构地区：[1]Department of Electrical and Electronics Engineering, Hacettepe University [2]Department of Electrical and Electronics Engineering, Bilkent University

出　　处：《Geodesy and Geodynamics》2019年第1期72-76,共5页大地测量与地球动力学（英文版）

基　　金：supported by the TUBITAK 115E915 project grant

摘　　要：Modeling Near Vertical Incidence Sounding(NVIS) High Frequency(HF) signal propagation in the ionosphere is important. Because, ionosondes which are special types of radars probing the ionosphere with certain HF frequencies(between 2 and 30 MHz), work mostly in NVIS mode(where elevation angle is between 89 and 90°). In this work, we are going to propose a new method for NVIS wave propagation in the ionosphere by discretizing the NVIS wave propagation path into mediums in which the refractive index changes linearly, where we solve the ray propagation in each medium analytically using calculus of variations and use Snell's Law at medium changes. The main advantage of the proposed solution is the reduced computational complexity and time. This algorithm can be used to simulate and compare the behavior of vertical ionosondes together with other ray tracing algorithms.Modeling Near Vertical Incidence Sounding(NVIS) High Frequency(HF) signal propagation in the ionosphere is important. Because, ionosondes which are special types of radars probing the ionosphere with certain HF frequencies(between 2 and 30 MHz), work mostly in NVIS mode(where elevation angle is between 89 and 90°). In this work, we are going to propose a new method for NVIS wave propagation in the ionosphere by discretizing the NVIS wave propagation path into mediums in which the refractive index changes linearly, where we solve the ray propagation in each medium analytically using calculus of variations and use Snell's Law at medium changes. The main advantage of the proposed solution is the reduced computational complexity and time. This algorithm can be used to simulate and compare the behavior of vertical ionosondes together with other ray tracing algorithms.

关 键 词：IONOSPHERE HF PROPAGATION CALCULUS of VARIATIONS 

分 类 号：P352.7[天文地球—空间物理学]