短波大气噪声的数值计算方法

Numerical Method for Calculating Shortwave Atmospheric Noise

采用傅里叶正弦级数和多项式插值相结合的数值方法,计算了1MHz参考频率在任意季节、任意时间段上的全球大气噪声分布,在此基础上,计算出短波有效大气噪声系数的时区中值及其相关概率分布参数,计算结果表明了该方法的准确性。与通过人工查图计算短波大气噪声的传统方法相比,该方法克服了查图算法误差较大的缺点,且极大地提高了计算效率,在短波通信线路方案设计、短波通信质量评估等方面具有重要的工程应用价值。

The worldwide atmospheric noise distribution of 1MHz reference frequency on arbitrary season and diurnal time is computed by using the numerical method of Fourier sine series combined with polynomial interpolation.And based on the results,the diurnal median of shortwave effective atmospheric noise and their correlative parameters of probability distribution are also calculated.The calculation results show the correctness of the method.As compared with the traditional chart techniques for manually calculating the atmospheric noise,this new method could have a better reduction of the errors and a greater improvement of calculation efficiency.It is of significant application value in shortwave communication project and performance evaluation.