卫星信号大气层路径弯曲改正的精确计算模型

PRECISE CALCULATION MODEL OF CORRECTION TO ATMOSPHERIC PATH CURVATURE OF SATELLITE SIGNALS

卫星信号在大气层中的传播路径是一条曲线 ,其轨迹很难精确描述。为精确计算其弯曲改正 ,用一条折线作为对折射曲线的一级逼近 ,然后再将折线分段 ,用圆弧分段逼近折射曲线。在此基础上 ,导出了一系列严密计算公式 ,精确计算在不同天顶距条件下的弯曲改正。最后构造了一个弯曲改正的计算模型。该模型简单方便 。

The propagating path of satellite signals through the atmosphere is a curve which is difficult to precisely plot. In order to precisely calculate the correction to its curvature we take a fold line as the approximation of 1st degree to the refractive curve,then divide the fold line into several sections.Thus the refractive curve can be approximated by circular arc.According to the above consideration, a series of strict formulae to calculate the curvature correction under the condition of different zenith distances are derived.At last, a model which is convenient and precise for calculating the curvature correction has been established.