最小群路径射线仰角的精确解与近似解

最小群路径射线仰角的精确解与近似解 THE EXACT AND APPROXIMATE SOLUTIONS OF THE ELEVATION ANGLE OF THE MINIMUM GROUP PATH RAY 黄锡文 Huan9 Xiwen first-author 对球面分层准抛物形电子分布的电离层,本文求出了其中最小群路径射线仰角（其正弦平方）的精确解,它根据已给的电离层参数一次算出,与常用的牛顿法多次选代求出的数值近似解比较,节省了计算工作量和计算机时,便于实时系统应用;而且精度更高。文中还用两种不同的方法求出该仰角的第一和第二两种近似解,两种方法结果相同,证实了结果的可靠性。第二近似解以电离层参数和工作频率的解析式直接表出,便于应用,作者并找到了应用。 The exact solution of the elevation angle of the minimum group path ray for a spherically stratified qusi-parabolic ionosphere is presented. It is diretly obtained by substituting the ionospheric parameters into an appropriate formula. When comparing with the numerical approximate solution obained by iterative methed, it is evaluated with less computer-time, is more favourable for real-time system, and has more accuracy.A first and a second approximate solutions are found in this paper. Each of them is derived by two different methods.The second approximate solution is presented in an analytic expression in terms of ionospheric parameters and operation freguency, therefore it is useful for practical applications. The relative errors of two appoximate solutions have been calculated. 1985-03-01 2021-04-01 3